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MICROLINE 3390/3391
PRINTER
Maintenance Manual
¡
iii
PREFACE
This maintenance manual describes how to maintain the Microline 3390/3391 printer in the field.
This manual is for customer engineers.
For further information, refer to the Users Manual for handling or operating the equipment.
i
TABLE OF CONTENTS
1. CONFIGURATION
1.1 Standard Printer Configuration
1.2 Options
2. THEORY OF OPERATION
2.1 Electrical Operation
2.1.1 Summary
2.1.2 Microprocessor and the Peripheral Circuit
2.1.3 Initialization
2.1.4 Parallel Interface Control
2.1.5 Print Control
2.1.6 SP/LF Motor Control
2.1.7 Operation Panel
2.1.8 Alarm Circuit
2.1.9 Power Supply Circuit
2.2 Mechanical Operation
2.2.1 Printhead Mechanism and Operation
2.2.2 Spacing Operation
2.2.3 Head Gap Adjusting
2.2.4 Ribbon Drive
2.2.5 Paper Feed Operation
2.2.6 Paper Detection Mechanism
2.2.7 Automatic Sheet Feed
2.2.8 Paper Park Function
3. ASSEMBLY/DISASSEMBLY
3.1 Precautions for Parts Replacement
3.2 Service Tools
3.3 Disassembly/Reassembly Procedure
3.3.1 Printhead
3.3.2 Ribbon Protector
3.3.3 Pull-up Roller Assy
3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy
3.3.5 Gear Case Assy
3.3.6 PC Connector
3.3.7 Space Motor, Guide Roller Assy
3.3.8 Space Rack
1. CONFIGURATION
1 – 1
1. CONFIGURATION
1.1. Standard Printer Configuration
This printer consists of the following assemblies:
Figure 1-1 Configuration
Sheet guide assy
Platen knob
Access cover
assy
Upper cover
Transformer assy
Pull-up roller assy
Operation panel assy
Main frame
Driver board
Control/Power supply assy
1 – 2
1.2 Options
(1) Cut sheet feeder unit (CSF)
(Narrow and wide versions available)
(2) Pull-tractor assy
Dual-bin CSF Single-bin CSF
Attachment assy
1 – 3
(5) Serial I/F
RS232C
RS422A
Current Loop
(3) Bottom push tractor unit
(4) Roll paper stand (Narrow only)
2. THEORY OF OPERATION
2 – 1
2. THEORY OF OPERATION
2.1 Electrical Operation
The electrical operation of the printer circuit is described in this section.
2.1.1 Summary
Fig. 2-1 shows the block diagram of the printer.
The control board is made up of the microprocessors, peripheral circuits, drive circuits, sensors
and interface connectors.
The power to the control board is supplied by the power board through the connector cord.
The power to other electrical parts is also distributed through the connectors within the control
board.
2.1.2 Microprocessor and the peripheral circuit
(1) Microprocessor (Q7: 67X640)
This processor is a CMOS single-chip computer with integrated peripheral device functions
and a 16 bit MPU core, all OKI original architecture.
The processor has a 20 bit address bus and a 16 bit data bus.
It is capable of accessing up to 1M word program memory and 1M bytes of data memory.
The following characteristics are also provided:
• Built-in type data memory of 512 bytes
8-bit 4-channel A/D converter × 1
16-bit automatic reload timer × 2
8-bit serial port × 2
8-bit parallel port × 3 (bitwise I/O specification available)
And others.
The function of this microprocessor is to provide a central mechanism for the entire printer
by executing the control program through the LSI and driver circuits.
2 – 2
Figure 2-1
12.288
MHz
4
Vcc-Level
TSD
SEL-N
AI
INT
Release-SW
Bottom-SW
PE-SENSOR
OPERATION
PANEL
Serial
Alarm
-circuit
Alarm-Odd
Alarm-Even
SP-Alarm
Power-off
Transformer
Rectifier
circuit
40 volt
8 volt
5 volt
Reset
circuit
Print-IPT
I/F-IPT
EEPROM
1Kbits
67 x 640
ADDRESS
ROM
max
4M
ROM
max
16M
16*1024 Kbits
AD-BUS
DRAM
4*64
Kbit*2
LSI
RESET
5VD
Vcc-Level
Fuse
40 V
LF
driver
SP
driver
SP alarm
Alarm-Odd
Alarm-Even
Head
driver
2P Encoder
M
M
SP
LF
TSD
Para-
I/F
(opt.)
RS232C-
I/F
Roll paper
stand
(opt.)
CSF
AC-input
Divider
2 – 3
(2) Program ROM
This is a 256 × 16 bits (4M bit) [MAX] EPROM with the control program for the printer
stored. The MPU executes instructions under this program.
The program ROM is assigned to the program memory area of the MPU and is fetched
by the PSEN signal of the MPU.
The following shows the operation of the memory access.
MPU CLOCK
A0~A17
PG-N
PSEN-N
D0~D15
Program Program Program
IN IN IN
CSO
PSEN
CE
OE
PG-N
D0~D15
A0~A17
MPU ROM
2 – 4
(3) RAM (MSM51C464A-80RS)
The RAM is CMOS dynamic RAM with (64K × 4-bit) × 2 configuration, and used as buffers
(such as receiving buffer, printing buffer, DLL buffer and working buffer).
The following shows the examples of the memory access operation.
A0~A7
RAM 1 (Q3)MPU
P03
CS1
RD
OE
D4~D7
D0~D3
RAS
CAS
RAM 2 (Q4)
T1 T2 T3
Clockout*
A0~A7
CS1~CS4
RD
D0~D7
(Read)
WRH
WRL
D0~D7
(Write)
8-bit bus, byte instruction
* Clockout is provided when the original excitation is selected.
2 – 5
(4) CG ROM
This is a 1024K × 16 bits (16M bits) MASK ROM with the font data for the characters
stored.
CG ROM is assigned to the program memory area of the MPU and is fetched by the PSEN
signal of the MPU.
The following shows the memory access operation.
D0~D15
P02
PSEN
MPU
CG-N
A0~A19
ROM
Program
IN
Program
IN
Program
IN
MPU CLOCK
A0~A19
CG-N
PSEN-N
D0~D15
CE
OE
2 – 6
(5) EEPROM
The EEPROM is a CMOS serial I/O type memory which is capable of electrically erasing
and writing 1,024 bits.
The EEPROM contains menu data.
The following shows the memory access operation.
MPU EEPROM
EEDIN-P
EECS-P
EEDOUT-P
EECLK-P
P24
P27
P25
P26
D1
CS
DO
SK
ReadyBus
twp
D0D15A0A5
11
0
Start
code
Operation
code
Address Data
t
CS
PRE = O
PE
EECS-P
EECLK-P
EEDIN-P
EEDOUT-P
Address
Start
code
Operation
code
EEDOUT-P
EEDIN-P
EECLK-P
EECS-P
D15 D0 D15 D0 D15
0
A0A5
0
11
t
CS
PRE = O
PE = X
Write cycle timing (WRITE)
Read cycle timing (READ)
2 – 7
(6) LSI
This LSI detects and controls the SP motor speeds by monitoring the two phase sensor
signals obtained from the DC motors and modifying the excitation phases as appropriate.
This LSI is connected in multiplex to the MPU.
P07
MPU
A/D bus
LSI
RD
WRL
P01
ALE
RDN
WRL
LSIC
Clockout*
A0~A19
LSICS
ALE
D0~D15
(Read)
RD
D0~D15
(Write)
WRL
Address
Address
Data
Data
* Clockout is provided when the original
excitation is selected.
2 – 8
2.1.3 Initialization
This printer is initialized when the power is turned on or when the I-PRIME-N signal is input
from the host side via the parallel interface.
For the initialize operation, the RST-N signal is first output from the reset circuit to reset the
MPUs and LSIs. When resetting ends, the program starts and the LSIs are reset by MPU via
LSIRST-N. Reset operation by I-PRIME starts program to initialize, but does not reset the MPU.
The program here sets the mode of the LSI including the MPU, checks the memories (ROMs
and RAMs), then carries out carriage homing, and determines the LF motor phase.
Finally, the program establishes the interface signals (P-I/F: ACK-P signal sending, and S-I/F:
BUSY-N signal off) and lights the SELECT lamp to inform the ready state for receiving to the
host side and ends the initialize operation.
End
I/F BUSY OFF
Serial
I/F
I/F ACK Send
Parallel
I/F
LF Motor Phase
Initialization
Carriage Homing
RAM Clear
LSI Initial Setting
and I/F Busy ON
External RAM
CHECK
LSI RESET
ROM CHECK
Internal RAM
CHECK
MPU
Initial Setting
MPU RESET
Start
2 – 9
2.1.4 Parallel Interface Control
The parallel data input from the host to the interfaced LSI is latched to its internal register at
the falling edge of the STROBE-N signal.
At the same time, the LSI sets the BUSY signal to the high level to inform the host that the
data is being processed, and outputs the RXD signal to inform the MPU of data reception. The
data is read upon receiving the RD-N signal from the MPU.
When the data processing ends, the BUSY signal is set to off and the ACK-N signal in sent
to request the next data. When reception is impossible because the buffer is full, the BUSY signal
is sent to request stopping of data transmission.
A/D bus
MPU LSI
NBSY
ACK
NSTB
RXD
P16 NRXD
Receive Data
CN1
BUSY
ACK-N
STB-N
Data
1 to 8
STROBE
BUSY
ACK
RXD
2~8µs
500ns max.
2 – 10
2.1.5 Print Control
Print data is transmitted as parallel data (HEAD1~HEAD24) from LSI to print head. LSI generates
print timing and drive time.
Print Data
MPU LSI
DRIVER
HEAD1-N~
HEAD24-N
Print Data
Print Head
Control/Power Supply Board
A/D bus
HEAD1~
HEAD24
Driver Board
HEAD DRIVE TIMING CHART
DT1
DT2
HEAD
DRIVE CURRENT
2 – 11
(d) Simultaneous Compensation of the number of impact pins
The LSI is provided with the compensation table for each pin to make necessary
compensation.
Print Compensation Control
The print compensation can be made as shown below:
(a) Voltage compensation (See 2.1.8 “Alarm Circuit.”)
(b) Temperature compensation (See 2.1.8 “Alarm Circuit.”)
(c) Pin stroke compensation
As shown in the drawing left, the stroke length
up to the platen is different for each pin.
Number of impact pins Few Many
Drive time Short Long
Print Head
Time
Pin 5~20
Pin 1~4,
21~24
Pin coil
current
Pin 1~4
5~20
21~24
Platen
2 – 13
2.1.6 SP/LF Motor Control
(1) Space Motor Control
The SP motor driver (HA13412) drives the three-phase brushless motor based on the
phase signal (SPU, SPV and SPW) and the speed instruction data from the LSI. The MPU
can identify the current speed of the space motor by measuring through the LSI the pulse
length of the output (øA, øB) of the slit encoder included in the space motor.
By comparing the target speed for each print mode with the actual current speed to change
the speed instruction data, the motor speed is accelerated or decelerated to maintain the
specified speed for each print mode.
SP truth table
HALL AMP INPUT OUTPUT
SPU SPV SPW U V W
H H L OPEN L H
H L L L OPEN H
H L H L H OPEN
L L H OPEN H L
L H H H OPEN L
L H L H L OPEN
SPU
SPV
SPW
2 – 14
(2) Encoder Disk
In the operation of the spacing motor, the PHASE-A and PHASE-B signals are generated
when the encoder disk interrupts the photo sensor.
The LSI divides these edge pulse signals in accordance with the print pitch, and sends
the IPT signal to provide dot-on timing and carriage position detection timing.
1/720"
1/120"
SPU
SPV
SPW
PHASE-A
PHASE-B
1/144"
IPT 10 CPI
IPT 12 CPI
IPT 15 CPI
IPT 17 CPI
IPT 20 CPI
1/180"
1/206"
1/240"
UTILITY MODE
2 – 15
(3) LF Motor Control
The LF motor driver (MTD2005F) drives the LF motor in two-phase or 1-2 phase bipolar,
based on the phase changeover data and the output current data from the LSI.
The data from the LSI is processed by a specific register contained in the LF motor driver
to measure the overdrive time and to change the phase.
[FORWARD]
PHASE-B
[REVERSE]
PHASE-A
2 – 16
2.1.7 Operation Panel
The clock synchronization OPCLK of LSI is used to input the switch data and output the LED
data through the operation panel control LSI (IC1: BU5148S).
LSI
OPTXD
OPCLK
OPCLR-N
OPRXD
77
78
80
OPTD
OPCK
NPA2
OPRD
Command
and Data 
latch
LED Driver
Switch
controller
+5V
79
A 2-byte (15 bits + 1 even parity bit) command (OPTXD) is transmitted to the LSI (BU5148S)
in synchronization with the OPCLK signal. The LSI decodes this command and when it is found
to be legal, returns a 2-byte command response back to the LSI which includes data on Switch
information, LED status, receive command ACK/NAK and 1 odd parity bit.
Any transmission errors found cause the command to be reissued after the transmission of the
OPCLR-N signal.
2 – 17
Note: From the illustration above, you can see that the command and the command response are output at the same time. This is because
the bit 0 to bit 3 of OPRXD are fixed so that the response can be returned before decoding the command.
OPTXD
OPCLK
OPRXD
OPCLR-N
1 2 3 2
3 1
6
5 or 8
bit0 bit7
Command (first) Command (second)
Command response (first) Command response (second)
Note
bit0 bit7
Reset
within
BU5148S
Power ON
Write instruction for LSI
reset
LSI write for LED data,
etc.
Read instruction for
data read
Response check
for OK or NG
Error notification
Instruction for
retransmission
1
2
3
4
7
8
5
6
NO
YES
7
2 – 18
2.1.8 Alarm Circuit
(1) Head drive time alarm circuit
This circuit monitors the drive time using the HDALM signal interlocked with the overdrive
signal of each drive circuit.
If the drive time of any drive circuit exceeds the specified time, the drive fault alarm circuit
sends an ALARM-N signal to turn on the SCR (SO).
This cause the secondary coil (40V) of the transformer to be short-circuited, causing an
overcurrent to flow through the primary coil and making the AC fuse (transformer ASS)
open.
(2) Alarm processing when DC power is low.
+ 40V is converted into the POWLEV signal (0V to +5V) by R531 and R532 and input
into the A/D port of the MPU to control the drive time and the print speed (pass number)
of the head.
(a) Head drive time
The head drive time is lengthened to compensate for the amount of voltage drop by
monitoring the POWLEV signal once every 500 µ sec. to control and maintain the
impact necessary for each printing pin at the fixed value.
(b) Print speed
Voltage, +40V Pass number Print speed
38V or more 1 Pass 100%
25V to 37V 1 Pass 100~30%
25V or less 1 Pass 30%
+40V
R531
R532
POWLEV
2 – 19
Mode Speed Pass Direction
1 100% 1 Bi
2 85% 1 Bi
3 70% 1 Bi
4 55% 1 Bi
5 40% 1 Bi
6 30% 1 Bi 1.5 Sec Stop
(7) Stop
When the temperature is between α°C and 119°C, the mode switches sequentially to
higher level. When the temperature falls below ß°C, the mode switches to lower level.
When the temperature exceeds 119°C, printing will stop.
When temperature gradient is steep, higher mode shall be specified directly.
(3) Head overheat alarm
The voltage of the output TSD signal of the thermistors, one of which is contained in the
print head and the other in the print head driver, is monitored by the CPU/AD port to control
the voltage
Mode and print control
Stop
Mode up
Mode down
Temp
119°C
α°C
ß°C
2 – 20
2.1.9 Power Supply Circuit
This power supply circuit supplies the +5VDC, +8VDC, +40VDC, 10VAC.
SW
Fuse
Noise
filter
circuit
Trans-
former
Control Board
Rectifier
Rectifier
Regulation
Circuit
+40V
+8V
+5V
AC10V
The uses of output voltages and signals are described below.
Voltage/signal Use
+5V Logic IC/LED drive voltage
+8V Serial interface line voltage and SP motor driver
+ 40V Printhead, LF motor drive voltage, SP motor drive voltage
AC 10V Option board
2 – 21
2.2 Mechanical Operation
2.2.1 Printhead mechanism and operation (See Figure 2-2.)
The printhead is a spring charged 24-pin driving head using a permanent magnet. It is attached
to the carriage, which moves in parallel with the platen. Electrically, this unit is connected to
the control circuits through the control board.
Figure 2-2 Arrangement of the head pins
View from the tip of the printhead
(1) The printhead configuration:
The printhead is composed of the following parts:
(a) Wire guide
(b) Spring assembly (Wire, Armature, Spring, Yoke, Spacer)
(c) Magnet assembly (Magnet, core, coil, Yoke)
(d) Printed circuit board
#1
#2
#23
#24
2 – 22
(2) Operation of printhead (See Figure 2-3.)
(a) When the printhead is idle, the armature is attracted by a permanent magnet and
the spring fixing the armature is compressed. The print wires fixed to each armature
are thus concealed under the wire guide.
(b) When a signal for a character to be printed is detected, a current flows through the
coil. When the coil is activated, the magnetic flux (caused by the permanent magnet
between the armature and the core) is canceled to eliminate the attraction force. The
armature is driven in the direction of the platen by the force of the armature spring.
The print wire fixed to the armature protrudes from the tip of the wire guide, strikes
the paper through the ribbon and prints a dot on the paper.
(c) After the character has been printed, the armature is magnetically attracted again
and the print wires are again concealed under the wire guide.
A thermistor in the printhead prevents burning caused by over-heating of the coil
during extended continuous bi-directional printing. When the temperature of the coil
exceeds a pre-determined limit (about 119°C) the control circuit detects a thermistor
signal. Printing will then be intermittent or stop completely until the coil temperature
falls below the limit value.
2 – 23
(1) When printing
(2) When not printing
Paper
Print wire
Printhead
Platen
Paper
Paper
Armature assembly
Print wire
Thermistor
Wire guide
Yoke
Spacer
Magnet assembly
Figure 2-3
2 – 24
2.2.2 Spacing operation (See Figure 2-4.)
The spacing mechanism consists of a carriage shaft mounted in parallel with the platen, and
a carriage frame that moves along the shaft. It is driven by a DC motor mounted on the bottom
of the carriage frame. Items included in the spacing mechanism are as follows:
(a) DC motor with motor gear
(b) Carriage frame (stationary yoke and motor driver board included)
(c) Carriage shaft
(d) Space rack
(e) Sensor
(f) Encoder disk
(1) Spacing operation
The carriage frame, on which the printhead and space motor are mounted, moves along
the carriage shaft in parallel with the platen. When the spacing motor rotates
counterclockwise, the driving force is transmitted to the motor gear. As the motor gear
rotates, the carriage moves from left to right.
Mechanically, it is designed in such a way that for every revolution of the DC motor, the
carriage frame moves 0.8 inch (20.32 mm).
At the same time the encoder disk rotates together with the motor and passes the sensor.
The position of the carriage frame can be determined by counting the interrupts detected
by the sensor.
In the same way, the rotation of the space motor can be recognized and controlled by
measuring the cycle of interrupts detected by the sensor.
2 – 25
Figure 2-4
Print Head
Carriage shaft
Carriage frame
Space rack
Encoder disk
Encoder sensor
Motor gear
Guide rail
Slider
2 – 26
2.2.3 Head gap adjusting (See Figure 2-5.)
The head gap adjusting lever moves back and forth to tilt the carriage frame, altering the gap
between the printhead and the platen.
The adjusting screw, which is connected to the adjusting gear rotates when the adjusting lever
is moved creating a fine gap adjustment. If the adjusting gear is pushed down, the adjusting
screw can be turned with a screw driver to change the coarse gap adjustment.
When the adjusting lever is set to range ~ the contact which is attached to the under side
of the carriage cover will connect with the contact of the space motor PC board. The printer
will reduce the printing speed automatically to ensure that adequate printing pressure is maintained
for multipart paper.
And, the adjusting cam adjusts the headgap toward left and right side in accordance with the
guide rail up and down as a position of the left end of it.
2 – 27
Figure 2-5
Platen
Range
1
2
3
4
5
Adjusting lever
Idler gear
Adjusting gear
Carriage shaft
Printhead
Adjusting screw
Range from 5 to 1
Adjusting cam
Adjusting screw
C.C.W.
Printhead
Narrows
Platen
Guide rail
Range from 1 to 5
Widens
C.W.
2 – 28
2.2.4 Ribbon drive (See Figure 2-6.)
The ribbon driver mechanism moves the ribbon in synchronization with the space motor operation.
The ribbon drive mechanism consist of the following items:
(a) Ribbon drive gear assembly
(b) Ribbon gear (space motor)
(c) Ribbon cartridge
(1) Ribbon cartridge
An endless ribbon with a single direction feed is used. Ink is supplied from an ink tank,
which is built in to the ribbon cartridge.
(2) Ribbon feed operation
When the space motor is activated, the ribbon gear rotates. The rotation is transmitted
via the ribbon drive gear assembly to the drive gear in the ribbon cartridge, thus moving
the ribbon.
The feed direction of the ribbon is maintained by switching the rotational direction of the
gears in the ribbon drive gear assembly. This ensures ribbon movement when bidirectional
printing is used.
2 – 29
Figure 2-6
Ribbon cartridge
Drive gear
Ink tank
2 – 30
2.2.5 Paper feed operation
Feeding of the paper is performed by turning the platen and the pin tractor, which is driven by
the LF pulse motor.
Item of the paper feed mechanism are as follows:
(a) Pulse motor with gears
(b) Decelerating gear
(c) Platen
(d) Tractor feed unit
(e) Pressure roller
2 – 31
(1) Cut sheet and continuous sheet switching mechanism (See Figure 2-8.)
Three different paper paths can be selected and set by the change lever.
(a) TOP (for cut sheet)
When the cut sheet is used in the manual mode or fed by the CSF (option), set the
change lever at the position marked TOP.
[Operation]
The driving force of the platen gear (R) is transmitted to the idle gear by setting the
change lever to the TOP position. However, this causes the idle gear to be disengaged
from the change gear, leaving it free.
At this time, the pressure rollers (at the rear and the front) are pressed securely to
the platen to feed the cut sheet. At the same time, the switch lever positions between
the rear switch and bottom switch, to confirm to the control board that you are in the
cut sheet mode.
In the cut sheet mode, the control board automatically feeds the sheet up to the print
start position after pausing for the wait time stored in the menu.
(b) REAR (Continuous sheet from push tractor)
When the change lever is set to REAR position, the change gear is engaged with
the idle gear and the tractor gear to transmit the rotation of the platen to the push
tractor shaft, and the continuous sheet is fed from the push tractor.
At the same time, the switch lever turns on the rear switch, to confirm to the control
board that you are in the continuous sheet mode.
2 – 32
(c) BOTTOM (Continuous sheet from bottom feeder) (option)
When the change lever is set in the BOTTOM position, the rotation of the platen
is transmitted to the drive gear of the bottom tractor feed unit through the idle gear
to feed the sheet which has been set in the bottom tractor feed.
At the same time, the switch lever turns on the bottom switch, to confirm to the control
board that you are in the continuous sheet mode.
Correlation in Mechanism
Mechanism
Lever
Position
Rear
Switch
Bottom
Switch
Idle
Gear
Change
Gear
Tractor
Gear
Sheet
Insertion
Manual/
automatic
CSF:
Operation SW 
or instruction
•
•
Operation 
SW 
or
instruction
•
•
Operation 
SW 
or
instruction
TOP
REAR
BOTTOM
OFF
ON
OFF
OFF
OFF
ON
Rotate
Rotate
Rotate
Stop
Rotate
Rotate
Stop
Rotate
Stop
2 – 33
BOTTOM
Change lever
Tractor gear
Figure 2-8
Platen
TOP
REAR
Change gear
Reset spring
Idle gear
(Bottom tractor unit)
Platen gear (R)
Control Power
supply Assy
Change gear shaft
Change lever
Change arm
Release shaft
Switch lever
Bottom switch
Rear switch
2 – 34
(2) Cut-sheet feeder operation (See Figure 2-9.)
The pulse motor used for the paper feed mechanism is mounted on the left of the frame,
and the rotation of the motor is transmitted through decelerating gears (LF idle gear, platen
gear) to the platen. When using cut-sheet paper, the change lever must be in the TOP
position to grab the paper, while disengaging the push tractor.
When the change lever is set to the TOP position, the cut sheet is automatically fed
in up to the print start position after pausing for the wait time stored in the menu.
Figure 2-9
Stepping motor
(LF motor)
Pressure roller
Platen
Platen gear
LF Idel gear
2 – 35
(3) Continuous paper feed operation (Rear) (See Figure 2-10.)
The force transmitted to the platen, rotates the tractor gear through platen gear, the idler
gear and the change gear. The rotation of the tractor gear makes the pin tractor belt rotate
through a sheet feeder shaft, feeding the continuous paper.
Paper
Idle gear
Change gear
Tractor gear
Platen gear
Figure 2-10
2 – 36
(4) Push and pull tractor mechanism (Option) (See Figure 2-11).
This mechanism consist of an optional pull tractor and a standard push tractor mechanism.
This mechanism can perform forward and reverse feed by setting continuous sheets to
the push tractor and pull tractor.
The rotation of the platen is transmitted to the push tractor and the pull tractor. Sheets
are fed by these two tractors at the same time.
To remove slack from the sheets, set the sheets according to the following procedure when
using the push and pull tractors.
1 Set the change lever to the REAR position (setting the sheets to the push tractor
to feed).
2 Set the paper, which is fed in front of the platen, to the pull tractor.
3 Set the change lever to the TOP position and feed paper using the platen knob.
4 If paper slack is removed, set the change lever to the REAR position.
Figure 2-11
Drive gear
Pull tractor
Idle gear
Push tractor
Platen gear
Platen
2 – 37
(5) Pull tractor mechanism (option) (See Figure 2-12.)
Bottom feed of continuous sheets is possible only when an optional pull tractor unit is
installed.
The rotation of the platen is transmitted to the idle gear of the pull tractor unit through
the platen gear at the left end of the platen. The rotation of the idle gear is transmitted
to the drive gear, and continuous sheet forms are fed by the pull tractor being rotated
through the sheet feeder shaft.
Figure 2-12
Continuous sheet form
Pull
Tractor assembly
Sheet feeder shaft
Drive gear
Idle gear
Platen
LF motor
Platen gear
LF Idle gear
2 – 38
(6) Bottom push feed operation (option) (See Figure 2-13).
The bottom push feed of the continuous sheet is possible only when the bottom tractor
feed unit is installed.
When the platen rotates, the rotational force of the platen is transmitted through the tractor
idle gear and the tractor change gear to the tractor drive gear of the bottom push tractor,
and the sheet of paper is fed in to the print start position.
Figure 2-13
Platen gear
Platen
Change gear
Idle gear
Tractor change gear
Tractor drive gear
Tractor idle gear
2 – 39
(7) Paper clamp mechanism (See Figure 2-14.)
When setting the change lever to the BOTTOM , TOP or REAR position, the operation
of the front release gear arm changes according to the position of the release cam. And
at the same time, the position of the cam installed to the front release gear shaft changes,
and the open and close of the pressure roller.
Position of
change lever
Open or close of
front pressure roller
Open or close of
rear pressure roller
BOTTOM OPEN OPEN
TOP CLOSE CLOSE
REAR OPEN OPEN
2 – 40
Figure 2-14
REAR
Release cam
Platen
TOP
BOTTOM
Change arm
Change lever
2 – 41
2.2.6 Paper detection mechanism (See Figure 2-15.)
(1) Cut sheet detection
When the cut sheet is inserted, the point A is pushed backward and the paper near end
lever B rotates counter clockwise (CCW).
At this time, the rear sensor lever rotates counterclockwise (CCW), the rear sensor lever
and pulls out of the rear and top paper end sensor to detect that the sheet is provided.
The procedure for the paper end is made in the reverse order, that is, its detection is
performed when the paper end sensor is blocked.
(2) Rear feed detection
When the sheet is fed from the push tractor, the point B is pushed to the front side and
the paper near end lever A rotates clockwise (CW). At this time, the rear sensor lever
rotates counterclockwise (CCW), and pulls out of the rear and top paper end sensor to
detect that the sheet is provided.
The procedure for the paper end is made in the reverse order, that is, its detection is
performed when the rear sensor lever intercepts the sensor.
(3) Bottom feed detection
When the sheet is fed from the bottom, the point C rotates clockwise (CW). When the
bottom sensor lever rotates clockwise (CW), it pulls out of the bottom paper end sensor
to detect that the sheet is provided.
The procedure for the paper end is made in the reverse order, that is, its detection is
performed when the bottom sensor lever intercepts the sensor.
2 – 42
Sensor lever
Paper end sensor
Shaded portion
A
B
Paper end lever
Bottom paper end lever
Figure 2-15
2 – 43
(4) Top line print mechanism (See Figure 2-16).
The front edge of the sheet is protected by the ribbon protector so that it can stop at a
position just near to the print head (0 tear off position) to start printing at the front end
of the sheet, without causing the sheet to crumple or curl up.
The printing starts at the front end of the sheet, and continues uni-directionally until the
front end of the sheet gets to the inside of the pull up roller cover.
After that, that printing continues bi-directionally.
2 – 44
Figure 2-16
Ribbon protector
Platen
Printhead
Carriage frame assembly
2 – 45
2.2.7 Automatic sheet feed
This function is used to feed in the sheet automatically up to the print start position when the
cut sheet or the continuous sheet is used.
[Operational procedure]
(1) When using the cut sheet
1) Set the change lever to the TOP position. (See Figure 2-17.)
2) Insert a sheet of paper between the platen and the paper shoot.
3) After the lapse of time selected by the “wait time” in the menu, the LF motor starts
its operation to feed the sheet of paper up to the print position.
4) When the default is selected, the sheet of paper is feed in up to the position 0.35
inches (first dot position) from the upper end of the sheet. However, the 0 tear off
mechanism allows the printing at the front end of the sheet by changing the TOF
position.
Figure 2-17
Time out
Time selected
on the menu
Sheet setting
PE
Detection timer
LF action
REAR
BOTTOMTOP
BOTTOM
REAR
TOP
SW1
SW2
2 – 46
(2) When using the continouos paper
1) Set the change lever either to the rear side or the bottom side position. (See Figure
2-17.)
2) Set a sheet of paper either to the push tractor or the bottom tractor.
3) Press the “FF/LOAD” switch.
4) The LF motor starts its operation to feed the paper up to the print start position.
5) The paper is fed in up to the TOF position (Factory default: 0.35 inches from the top).
Push down the “FF/LOAD” switch.
Detection of the sheet supplied
PE
LF action
Line feed (about 3 inches) until the
detection of the sheet supplied
When the “”FF/LOAD” switch is pushed down, the LF motor feeds in the sheet about 3
inches. When the LF motor completes the operation and the sheet has not been fed in,
the feeding operating operation becomes, ineffective, thus resulting in the feeding jam.
2 – 47
2.2.8 Paper park function (continuous paper)
Continuous sheets which have been inserted can be reversed automatically by using the “PARK”
button on the operation panel.
1) Press the “PARK” button on the operation panel.
2) Reverse LF is started and paper is fed in reverse until paper end occurs or 19 inches
maximum have been fed.
3) The paper is fed in reverse, to leave the paper on the push-tractor or bottom-tractor.
Alarm LED lights up when P.E. is not detected after 19 inches reverse feeding.
Operator can press SEL key to turn off the ALARM LED then press PARK key to continue
park function.
This operation is required when the length of paper for parking is more than 19 inches.
Paper end detection
PE
Reverse LF until paper end or 19 inches max.
LF action
PARK
Reverse LF from P.E. Sensor to tractor feed assy.
3. ASSEMBLE/DISASSEMBLE
3 – 1
3. ASSEMBLY/DISASSEMBLY
This section explains the procedures for removing and installing various assemblies and units
in the field.
Description is mainly limited to the removal procedure; installation should basically be performed
in the reverse sequence of the removal procedure.
3.1 Precaution for Parts Replacement
(1) Remove the AC cable and the interface cable before disassembling or assembling.
(a) Turn off the AC power switch. Remove the AC input plug of the AC cable from the
receptacle. Remove the AC cable from the inlet on the printer (only 200V).
(b) To connect the AC cable again, connect it to the inlet on the printer (only 200V) first,
then insert the AC input plug into a receptacle.
(2) Do not disassemble the printer as long as it is operating normally.
(3) Do not remove unnecessary parts, and limit the disassembly area as much as possible.
(4) Use the designated service tools.
(5) Carry out disassembly in the prescribed sequence; otherwise, damage to the parts may
result.
(6) It is advisable to temporarily install screws, snap rings and other small parts in their original
positions to avoid losing them.
(7) Whenever handling the microprocessors, ROM, RAM IC chips and boards, do not use
gloves which may cause static electricity.
(8) Do not place the printed circuit board directly on the equipment or on the floor.
(9) If adjustment is specified in the middle of installation, follow the instructions.
AC input aplug
AC receptacle
AC cable
Interface cable
3 – 2
3.2 Service Tools
Table 3.1 lists the tools necessary for replacing printed circuit boards and parts of units in the
field.
Table 3.1 Service tools
1
No. 1-100 Phillips
1
Screws
screwdriver 2.6 mm
2
No. 2-200 Phillips
1
Screws
screwdriver 3-5 mm
3
No. 3-100
1
screwdriver
4 Spring hook 1
5 J-YX4025–83335-3 1
Head gap
adjustment
6 Volt/ohmmeter 1
7 Feeler gauge 1
Head gap
adjustment
8 Pliers 1
9 No. 5 nippers 1
10
1.1 lbs (500 g)
1
bar pressure gauge
No. Service Tool Q’ty Use Remarks
3 – 3
3.3 Disassembly/Reassembly Procedure
This section explains the assembly replacement procedures according to the following disassembly
system.
[Parts Layout]
Figure 3-1 Printer unit
Upper cover assy
Transformer assy
Control/Power supply board
Printhead
Driver board
Printer unit
Operation panel board
3 – 4
[How to Change Parts]
This section explains how to change parts and assemblies appearing in the disassembly diagram
below.
Printer unit
3.3.1 Printhead
3.3.2 Ribbon protector
3.3.3 Pull-up roller assy
3.3.4 Upper cover, access cover and sheet guide
3.3.5 Gear case assy
3.3.6 PC connector
3.3.7 Space motor and guide roller assy
3.3.8 Space rack
3.3.9 Carriage cable
3.3.10 Back-up roller holder assy
3.3.11 Platen assy
3.3.19 Paper pan
3.3.12 Driver board (SRXD)
3.3.13 LF motor
3.3.18 Carriage shaft
3.3.14 Operation panel PCB (LEOP)
3.3.15 Control/Power supply board (SRXC)
3.3.16 Transformer assy
3.3.17 Change lever and gears
3.3.20 Rear tractor assy
3.3.22 Switch lever
3.3.21 Rear pressure assy
3 – 5
3.3.1 Printhead
(1) Open the access over.
(2) Pull up and rotate the head clamp 1 to unclamp the printhead 2 as shown fig. 3.3.1.
(3) Disconnect the printhead 2 from PC connector 3.
(4) To install, follow the removal steps in the reverse order.
Notes on installation:
(1) Insert the printhead 2 into the PC connector 3 while pushing it against the carriage frame
4.
(2) The head clamp 1 must surely be sandwiched between printhead 2 and carriage frame
4 as shown fig. 3.3.2.
(3) Be sure to check the gap between platen and printhead (See 4).
(4) Be careful not to touch the print head while it is very hot.
4
3
1
2
4
2
1
2
1
Figure 3.3.1 Figure 3.3.2
3 – 6
3.3.2 Ribbon Protector
(1) Remove the printhead (see 3.3.1).
(2) Open the pull-up roller cover 1.
(3) Raise and remove the ribbon protector 2.
(4) To install, follow the removal steps in the reverse order.
1
2
3 – 7
3.3.3 Pull-up Roller Assy
(1) Open the access cover 1.
(2) Lift up the sheet guide Assy 4 to remove.
Note: Please do after always removing the sheet guide Assy 4 when the pull-up roller
Assy 2 is installed and removed.
(3) Tilting the pull-up roller Assy 2 toward the front, remove from the shaft of platen Assy
3.
(4) To install, follow the removal steps in the reverse order.
1
2
3
4
3 – 8
3.3.4 Upper Cover Assy, Access Cover Assy and Sheet Guide Assy
(1) Pull off the platen knob 1.
(2) Turn the change lever 2 toward the bottom position.
(3) Insert a flat-blade screwdriver into grooves (5 places) (4 places for narrow type) of frame
and twist to disengage claws of upper cover 3.
(4) Raise the front side of upper cover Assy 3 and shift toward the rear to disengage claws
(6 places) (5 places for narrow type) of frame.
(5) Raise the upper cover Assy 3 to remove.
(6) Open the access cover Assy 4 toward the front to remove.
(7) Lift up the sheet guide Assy 5 to remove.
(8) To install, follow the removal steps in the reverse order.
Remark on assembly:
Match the posts A at the both sides of the Sheet Guide 5 with the arrow marks on
the upper cover. Push the Guide into the Cover.
1
3
4
5
2
A
3 – 9
2
4
3
1
3.3.5 Gear Case Assy
(1) Remove the printhead (see 3.31).
(2) Remove the upper cover (see 3.3.4 (1) – (5)).
(3) Move the carriage Assy to right hand side, remove two screws 1, then the space motor
2.
(4) Disconnect a carriage cable.
(5) Disengage claws (4 places).
Using a flat-blade screwdriver, push to widen the claw for easy disengagement.
(6) Remove the gear case Assy 3 in upper direction and release the carriage cable from the
cable clamp of the gear case Assy.
(7) To install, follow the removal steps in the reverse order.
Note on installation:
(1) To assemble, align the direction of the SP motor axis 4 with the Gear Hole of the Gear
Case assy.
(2) Be sure to check, and adjust if necessary, the gap between platen and printhead (see
4-1).
3 – 10
3.3.6 PC Connector
(1) Remove the printhead (see 3.3.1).
(2) Remove the upper cover (see 3.3.4 (1) – (5)).
(3) Remove the gear case Assy (see 3.3.5).
(4) Remove the PC connector 1 from the space motor Assy 2.
(5) To install, follow the removal steps in the reverse order.
Note on installation:
(1) Do not touch the space motor 2 or terminals of PC connector 1. Also, take care to avoid
dust or foreign matters.
(2) After installation, check and adjust the gap between platen and printhead (see 4-1).
1
2
3 – 11
D
3.3.7 Space Motor, Guide Roller Assy
(1) Remove the printhead (see 3.3.1).
(2) Remove the upper cover (see 3.3.4 (1) – (5)).
(3) Remove the gear case Assy (see 3.3.5).
(4) Remove the PC connector (see 3.3.6).
(5) Remove screw 2, then the guide roller Assy 3 from the space motor 1.
(6) To install, follow the removal steps in the reverse order.
Notes on installation:
(1) Do not touch the terminals of space motor 1. Also, take care to avoid dust or foreign
matters.
(2) When installing the guide roller Assy 3, push portions A and B against the space motor
1.
(3) When installing the space motor 1, align the face C with carriage frame 4 and push portion
D against the frame.
(4) After installation, check and adjust the gap between platen and printhead (see 4-1).
C
1
B
A
3
2
4
1
3
3 – 12
3.3.8 Space Rack
(1) Remove the printhead (see 3.3.1).
(2) Remove the upper cover (see 3.3.4 (1) – (5)).
(3) Remove the gear case Assy (see 3.3.5).
(4) Remove the space motor (see 3.3.7).
(5) Remove the spring 1.
(6) Disengage the claw on left side of space rack 2 from the frame, and remove the space
rack 2 in upper direction.
(7) To install, follow the removal steps in the reverse order.
Note on installation:
(1) After installation, check and adjust the gap between platen and printhead (see 4-1).
1
1
2
2
2
3 – 13
3.3.9 Carriage Cable
(1) Remove the printhead (see 3.3.1).
(2) Remove the upper cover (see 3.3.4 (1) – (5)).
(3) Remove the gear case Assy (see 3.3.5).
(4) Remove the space motor (see 3.3.7).
(5) Remove the space rack (3.3.8).
(6) Remove two screws 1, release the driver board 2 and PCB sheet 9 by lifting clamp 8,
and disconnect cable from connector 3, 4, 5, 6.
(7) Remove carriage cable 7 from fasteners on frame.
(8) To install, follow the removal steps in the reverse order.
Note on installation:
(1) Take care not to fold the carriage cable 7 during installation. Curve slightly the carriage
cable 7 when assembling into the fasteners.
(2) Make sure that the paper end lever A will not contact the Paper end Sensor 0 when
mounting the Driver Board.
0
A
2
7
8
6
9
2
5
1
1
4
3
7
Claw
Claw
3 – 14
3.3.10 Backup Roller Holder Assy
(1) Remove the printhead (see 3.3.1).
(2) Remove the upper cover (see 3.3.4 (1) – (5)).
(3) Remove the gear case Assy (see 3.3.5).
(4) Remove the space motor (see 3.3.7).
(5) Remove the backup roller spring 2.
Disengage claws (2 places) of roller holder from the carriage frame 1, and remove the
backup roller holder assy 3.
(6) To install, follow the removal steps in the reverse order.
Note: Small round hole with metal tip on back up roller holder assy 3 should be facing
up when installing.
Claw (2 places)
1
3
2
3 – 15
3.3.11 Platen Assy
(1) Remove the printhead (see 3.3.1).
(2) Remove the ribbon protector (see 3.3.2).
(3) Remove the pull-up roller Assy (see 3.3.3).
(4) Remove the upper cover (see 3.3.1 (1) – (5)).
(5) Turn the change lever 1 to the bottom position.
(6) Push in the lock levers 2 on both sides to unlock from the frame, then rotate them upward
by 90°.
(7) Remove the platen Assy 4 from base frame.
(8) To install, follow the removal steps in the reverse order.
1
2
2
2
2
4
3 – 17
3.3.13 LF Motor
(1) Remove the printhead (see 3.3.1).
(2) Remove the ribbon protector (see 3.3.2).
(3) Remove the pull-up roller Assy (see 3.3.3).
(4) Remove the upper cover (see 3.3.4 (1) – (5)).
(5) Remove the platen Assy (see 3.3.11).
(6) Remove the driver board (see 3.3.12).
(7) Remove the left FG plate 1.
(8) Release the lock A to remove the LF motor 2.
(9) To install, follow the removal steps in the reverse order.
Remark on assembly:
(1) Press the LF Motor Cable with a portion A of the Motor Plate.
Lock A
2
1
A
3 – 18
3.3.14 Operation Panel PCB (LEOP)
(1) Remove the upper cover (see 3.3.4 (1) – (5)).
(2) Disconnect the cable 1 from connector 3 of Driver board 2.
(3) Disengage claws on both sides from the frame, and remove the operation panel 4.
(4) Open claws (8 places) and remove the operation panel PCB 5 from the operation panel
4.
(5) To install, follow the removal steps in the reverse order.
5
3
4
2
1
3 – 20
3.3.16 Transformer Assy
(1) Remove the upper cover (see 3.3.4 (1) – (5)).
(2) Remove AC inlet 1 and AC switch 2 from the frame guide.
(3) Disconnect the cable 3 from the connector 4 on the Control/Power Supply Board 5.
(4) Remove a screw 6 and disconnect ground cable 7.
(5) Remove two screws 8 and shift the transformer Assy 9 to the left and remove it.
9
3
6
1
8
7
2
4
5
3 – 21
3.3.17 Change Lever and Gears
(1) Remove the upper cover (see 3.3.4 (1) – (5)).
(2) Remove the reset spring 1, then remove the idle gear 2, the tractor gear 4 and the change
gear 5.
(3) Push back the protrusion of the Change Gear Shaft 6 with a flatblade screw driver to
remove the change lever 3.
(4) To perform mounting, follow the reverse procedure of removal.
Remark on assembly:
(1) To insert the change lever into the Change Gear Shaft 6, match the flat surface (D cut).
3
5
2
4
1
3
D cut
6
3 – 22
3.3.18 Carriage Shaft
(1) Remove the printhead (see 3.3.1).
(2) Remove the upper cover (see 3.3.4 (1) – (5)).
(3) Remove the driver board (see 3.3.12).
Remove the FG plate (L) 2.
(4) Slide the carriage shaft 1 to the left side (in the direction of the arrow) to remove.
(5) To perform mounting, follow the reverse procedure of removal.
Note on installation:
(1) After installation, check and adjust the gap between platen and printhead (see 4-1).
1
2
3 – 23
3.3.19 Paper Pan
(1) Remove the printhead (see 3.3.1).
(2) Remove the ribbon protector (see 3.3.2).
(3) Remove the pull-up roller assy (see 3.3.2).
(4) Remove the upper cover assy (see 3.3.4 (1) – (5)).
(5) Remove the platen assy (see 3.3.11).
(6) Release claws A .
(7) Lift up the paper chute assy 1 and remove.
(8) To perform mounting, follow the reverse procedure of removal.
1
A
3 – 24
3.3.20 Rear Tractor Assy
(1) Remove the printhead (see 3.3.1).
(2) Remove the ribbon protector (see 3.3.2).
(3) Remove the pull-up roller assy (see 3.3.3)
(4) Remove the upper cover (see 3.3.4 (1) – (5)).
(5) Remove the reset spring (see 3.3.17 (3))
(6) Remove the tractor gear 1.
(7) Shift the drive shaft 2 to the right side to remove (in the direction of the arrow).
(8) To perform mounting, follow the reverse procedure of removal.
Remark on assembly:
(1) When the Tractor Assy (L) 3 (R) 4 have been detached from the Drive Shaft, align the
protrusions 5 of the Pin Tractor Wheels to the same direction before assembly.
1
2
5
3
4
3 – 25
3.3.21 Rear Pressure Assy
(1) Remove the upper cover (see 3.3.4 (1) – (5)).
(2) Remove the change lever and gears (see 3.3.17).
(3) Remove the paper pan (see 3.3.19).
(4) Remove the rear pressure roller 1.
(5) Rotate the release shaft 2 and move it to the left to detach the release shaft 2.
Match the Main Frame Rib A with the protrusion B of the Release Shaft.
(6) Remove rear pressure SP assy 3.
(7) To install, follow the removal step in the reverse order.
Note: (1) At mounting release shaft 2, pay attention to the gear engagement of release
shaft 2, change arm lever 6, change gear shaft 7.
(2) There are 5 Rear pressure Spring Assemblies. Use two pieces which have
larger spring diameter on the right side. Use three remaining pieces on the
left side (for ML3391).
(3) Make sure that the Release Shaft 2 will be on top of the Support spring 4.
(4) To assemble the Release Shaft 2, make sure that the protrusion of the switch
lever 5 is in the U groove of the Release Shaft 2.
3
1
3
3
2
5
2
4
A
B
7
6
2
3 – 26
3.3.22 Switch Lever
(1) Remove the upper cover (see 3.3.4 (1) – (5)).
(2) Remove the change lever and gears (see 3.3.17).
(3) Remove the paper pan (see 3.3.19).
(4) Remove the rear pressure assy (see 3.3.21).
(5) Pull the Switch Lever toward you and remove it upward.
(6) To install, follow the removal step in the reverse order.
Remark on assembly:
(1) At the time of the Switch Lever assembly, make sure that the Micro switch on the Main
Board works properly.
Switch lever
Micro switch
Switch lever
4. PERIODIC MAINTENANCE
4 – 1
4. ADJUSTMENT
(1) Be sure to carry out this adjustment with the printer mechanism mounted on the lower
cover.
(2) Be sure to carry out this adjustment operation on a level and highly rigid work table
(flatness: less than 0.039 inch or 1 mm) so as to minimize adjustment error.
4 – 2
ItemNo. Specification Drawing Adjustment method
Gap between the plat-
en and the print head
1) Parallelism ad-
justment
4–1–1
Variation of
value at the
left, the center
and the right
shall be less
than 0.02 mm
It shall be measured
at 3 points: the left
end, the center and
the right end of the
platen.
Adjustment method
(1) Gap between the
platen and the
print head at the
left end and the
right end shall be
adjusted by rota-
ting the adjust
cam.
(2) Set the adjust
lever at the
Range: 1. Press
the adjust gear
downward (in
direction A) to
push the adjust
gear and the
adjust gear out of
mesh.
(3) Adjust the gap by
rotating the adjust
screw in direction
B or C while the
adjust lever and
the adjust gear
are disengaged.
(4) After adjustment,
mark the adjust
cam position with
a red pen.
0.41±0.03 mm
2) Initial adjustment
After adjustment, mark the adjust
composition with a red pen.
Adjust cam
Marking
Carriage shaft
Platen
Center
Left
Right
Range: 1
Range: 5
Adjust lever
Adjust screw
Adjust gear
Adjust cam
Right
Left
Print head
4 – 3
ItemNo. Specification Drawing Adjustment method
Note 1)
The head gap shall be
measured with the
change lever set to
rear position.
Note 2)
The head gap shall be
measured positioning
the platen gear (R)
craw on the top.
Note 3)
Move the adjust
screw in clockwise
direction (in direction
B) to measure.
Measure variation of
gap when range is
changed.
4–1–2 Gap=0.71
±0.05 at the
range 5.
Adjust lever
Adjust gear
Adjust
spring
Adjust
screw
B
C
Adjust lever
Adjust gear
Print head
Click of platen gear R
Platen
Adjust cam
Gap
A
4 – 4
ItemNo. Specification Drawing Adjustment method
Gap between the con-
tact and the monitor
0.3mm or more
Touching
Adjust lever
Contact
Motor PCB
Confirm followings.
Make sure that the
gap between the con-
tact and the motor
PCB is 0.3 mm or
more.
At the time of printing
test, make sure that
the contact touches
the motor PCB and it
becomes reduced
speed mode when the
adjust lever is set to
range 2 and 4.
0.3mm or
more
4 – 5
ItemNo. Specification Drawing Adjustment method
4–2 1±0.5 Confirm followings.
(1) When the change
lever is set at
Friction position,
the gap between
the platen and the
paper pan at the
rear side shall be
1±0.5mm.
(2) When the change
lever is set at
Rear or Bottom
position, the gap
between the pla-
ten and the paper
pan at the front
side shall be
1±0.5 mm.
4–3 Confirm followings.
(1) When the change
lever is set at
Friction position,
all the pressure
rollers shall be
pressed to the
platen.
(2) When the change
lever is set at
Rear or Bottom
position, the gap
between the pla-
ten and the pres-
sure roller at the
rear side shall be
3mm. The front
pressure rollers
shall be pressed
to the platen.
Gap between the
platen and the paper
pan
Gap between the
platen and the pressure
roller
Rear
Bottom
Change lever
Platen
1±0.5
1±0.5
(At friction)
(Rear,
Bottom
position)
Paper pan
Friction
position
Rear, Bottom
position
Bottom
Change lever
(Center friction)
Rear
Paper pan
Pressure roller
Front pressure
roller
Platen
4 – 6
ItemNo. Specification Drawing Adjustment method
Rotation of the push
tractor
4–4–1 To confirm:
The tractor gear shall
rotate smoothly when
the change lever is
set at Friction posi-
tion.
Backlash between
gears
4–4–2 Approx. 0.05 to
0.11 mm
To confirm:
There shall be slight
backlash between
gears to allow smooth
rotation of gears.
(Backlash 0.05 to
0.11 mm)
Push tractor
Change lever (Center friction)
Tractor gear
Slight backlash
4 – 7
ItemNo. Specification Drawing Adjustment method
Ribbon feed4–5–1 To confirm:
Ribbon shall be fed
smoothly when the
carriage is moved
from side to side.
Running load to spac-
ing mechanism
4–5–2 To confirm:
Make sure that the
power is turned off at
the time of measure-
ment.
250g or less
without a rib-
bon cartridge
Ribbon feeding
Load
measurement
portion
Ribbon
cartridge
Ribbon
4 – 8
ItemNo. Specification Drawing Adjustment method
4–6 To confirm:
The idle gear of the
LF motor and the
platen gear (L) and
the bias gear of the
platen shall be in
mesh in such way that
the platen gear (L)
and the bias gear
rotate against each
other to pinch the
teeth of idle gear.
The idle gear stays in
mesh with the platen
gear (L) and the bias
gear and not locked.
The bias gear and the
platen gear shall be
staggered by one
teeth as shown in the
drawing.
Engagement of the
double gear and the LF
motor idle gear of the
Platen Assy.
LF Motor
idle gear
Platen gear (L)
Bias gear
Tension
Not good
(Locked)
Good
5. TROUBLESHOOTING
FLOWCHARTS
5 – 1
5. CLEANING AND LUBRICATION
5.1 Cleaning
[Cautions]
1. Be sure to turn OFF the AC POWER switch before cleaning. Remove the AC Power cord
from the printer.
2. Avoid dust inside the printer mechanism when cleaning.
3. If a lubricated part has been cleaned, be sure to apply lubricating oil to that portion after
cleaning.
(1) Cleaning time
When the equipment operating time has reached six months or 300 hours, whichever
comes first.
(2) Cleaning tools
Dry cloth (soft cloth such as gauze), vacuum cleaner
(3) Places to be cleaned
Table 5.1 lists the places to be cleaned:
Table 5.1
Place to be cleaned Cleaning procedure
Carriage shaft and the vicinity Remove paper waste and wipe off
Paper travel surface stain, dust, ribbon waste. etc.
5 – 2
Carriage
shaft
5 – 3
5.2 Lubrication
This printer is designed to be maintenance free and requires no lubrication during normal
operation. However it is necessary to apply lubricant in case the printer is disassembled,
reassembled, cleaned or parts have been changed.
(1) Cleaning time
Remarks:
1) Turn off the power before cleaning.
2) Make sure that paper dust will not fall inside of the machine.
Cleaning period:
6 months of operation or 300 hours of operation, whichever the earlier.
Cleaning points:
Carriage shaft and surroundings: Remove paper and ribbon dust.
Paper path: Clean stains and dusts.
Paper End Sensor Remove the dust on the Sensor.
(2) Lubricant
Pan motor oil (or equivalent): PM
Molicort (or equivalent): EM-30L
(3) Amount of lubricant
Medium amount A : Apply three to four drops of oil, or 0.008 inch (0.2 mm) thick grease.
Small amount B : Apply one drop of oil (0.006±0.002 g)
(4) Areas to Avoid
No. Do not lubricate Reason Remarks
1 Platen assembly To prevent stained paper
(rubber face) and illegal paper feed.
2 Pressure roller (rubber To prevent stained paper Pay attention not to put
face) the grease on the rubber
face of the pressure roller.
3 Carriage shaft To stabilize carriage
traveling load
4 Ink ribbon To prevent blurring of print
image
5 Pin tractor To prevent stained paper
6 Flexible cable To prevent loose connection
and crack
7 Motor PCB To prevent loose connection
8 Connector terminals To prevent loose connection
6. SPARE PARTS LIST
6 – 2
6.3 Lamp Display
(1) Printer mode display
Table 6.2
Note:
BLINK1 : 400ms ON, 400ms OFF
BLINK2 : 200ms ON, 200ms OFF
: LED is kept in Current Condition (no change)
(2) Fault alram display
When the printer detects any of the various alarm states, the information is displayed as
shown below on the operation panel. The alarm is specified by lamp combination of PRINT
QUALITY and CHARACTER PITCH. (See Table 6.3 for details.)
SEL
SEL
MENU
SHIFT
LF
Micro Feed
Down
FF/LOAD
Micro Feed
Up
TEAR PARK QUIET
TOF
EXIT
POWER
ALARM
GROUP ITEM SET
MENU
PRINT
PRINT QUALITY
CHARACTER PITCH
LQ COURIER
UTILITY PRESTIGE
RESET
10
17
12
20
15
PROP
GOTHIC
BOLD
– ROMAN –
– SWISS –
Figure 6-1
ALARM
CATEGORY
ALARM
LED CONDITION
CONTENTS
TROUBLE
SHOOTING
ALARM SEL MENU 10CPI 15CPI
OPERATOR
ALARM
Paper end alarm ON OFF
From, cut sheet or bottom
paper end
Set New paper.
Paper change
lever alarm
ON OFF
BLINK
1
OFF
Change lever is set to TOP
position while paper is
already inserted from rear or
bottom.
• Set the lever to specified
position.
• Check rear sensor lever.
• Replace Control Board
Paper jam alarm ON OFF OFF
BLINK
1
• Cut sheet could not be
ejected.
• Cut sheet could not be fed
properly
• Remove the paper or check
feed Mechanism
• Press SEL key.
Print Head
thermal alarm
OFF
BLINK
1
——
Print head temperature
exceeds 119°C
• Wait until it is cooled.
• Replace P.H. or Driver
Board
Space motor
thermal alarm
OFF
BLINK
1
——
Temperature of space motor
exceeds specified value.
• It is recovered automatically
• Replace SP motor or Driver
Board
FATAL ALARM
BLINK
2
OFF OFF See Table 6.3
Hardware Alarm has
occurred.
See Table 6.3.
6 – 3
(3) Fatal Alarm
Table 6.3 (1/2)
ALARM
CATEGORY
ALARM
LED DISPLAY
ALARM 10 12 15 17 20
PROP UTILITY PRESTIGE BOLD
REMARKS TROUBLESHOOTING
MAIN
CONTROL
ALARM
FIRMWARE
DETECTION
ALARM
SERIAL
INTERFACE
ALARM
MPU internal
RAM alarm
Program ROM
alarm
RAM on Control
Board alarm
CG ROM alarm
EEPROM alarm
WDT (Watch Dog
Timeout) alarm
NMI signal alarm
BRK instruction
alarm
MPU internal
RAM alarm
ROM alarm
RAM on I/F board
alarm
I/F not mounted
Read/write error
Check sum error
Read/write error
Check sum error
No reaction when MPU 
reads data
MPU is locked up and it 
ios reset after 65ms.
NMI port of MPU is
kept low level.
FFFF data is detected
due to MPU locked up.
Read/write error
Check sum error
Read/write error
No reaction from 
serial I/F board
Replace Control/
Power Supply Board
Replace ROM or Con-
trol/Power Supply Board
Replace Control/
Power Supply Board
Replace Control/
Power Supply Board
Replace Control/
Power Supply Board
Turn the power OFF and
ON or replace Control/
Power Supply Board
Turn the power OFF and
ON or replace Control/
Power Supply Board
Replace ROM or Con-
trol/Power Supply Board
Replace I/F Board
Replace ROM on I/F
board or I/F Board
Replace I/F Board
Replace I/F Board or
Control Board.
: LED Blink (200ms ON, 200ms OFF)
: LED Lights up
6 – 5
AC connector
Switch
Transformer
Centro-connector
Control/Power Supply Board
LF motor
Print head
Driver board
Operation panel board
Space motor
6 – 6
6.4 Connection Circuit Check for Printhead and SP/LF Motor
(1) Printhead
Signal Connector pin number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
FG
HD1
HD3
HD9
HO11
COM
COM
HD17
HD19
HD21
HD22
HD20
HD18
COM
COM
HD12
HD10
HD4
HD2
TH
FG
HD5
HD7
HD13
HD15
COM
COM
HD23
HD24
COM
COM
HD16
HD14
HD8
HD5
TH
1
2
1
2
#1
1
2
#3
1
2
#5
1
2
#7
1
2
#9
1
2
#11
#1
#3
#5
#7
#9
#11
1
2
#13
#13
1
2
#15
#15
1
2
#17
#17
1
2
#19
#19
1
2
#21
#21
1
2
#23
#23
1
2
#2
#2
1
2
#4
#4
1
2
#6
#6
1
2
#8
#8
1
2
#10
#10
1
2
#12
#12
1
2
#14
#14
1
2
#16
#16
1
2
#18
#18
1
2
#20
#20
1
2
#22
#22
1
2
#24
#24
CN1
Thermistor (Typ.: 5k ohm)
6 – 7
(2) Line Feed Motor
Resistance of each coil should be about 7.6.
Signal Connector pin number
LF1
LF2
LF3
LF4
CN6
LF
motor
6 – 8
(3) Space Motor
Resistance of each coil should be about 5.
Signal Connector pin number
SP-U
SP-V
SP-W
SPA
SPB
+ 5V
EL
CN2
SP
Motor
øA
øB
DA
Vcc
DK
G
200Ω
3
5
2
20
10
11
18
R1
6 – 9
6.5 Troubleshooting flow chart
1 Power is not supplied.
Is the AC cable connected correctly?
Yes No
Connect the AC cable correctly.
Is fuse F1 on the transformer assy/or F1 on the control/power supply board blown?
No Yes
Replace fuse (with same type and rating).
Remedied?
No Yes
End
Does DC + 8V out?
No Yes
Remove Print Head. (Turn power off, then on.)
Remedied?
No Yes
End
Replace carriage cable or ribbon feed mechanism.
Remedied?
No Yes
End
Replace Control/Power Supply Board
Remove CN3 on Driver Board
Measure for any short circuits between + 5V, + 40V, + 8V, 0V (EL or EP).
Any short circuit?
No Yes
6 – 10
Driver Board
CN2
20••••••••••••1
No Yes
Replace Driver Board.
Replace Transformer Assy.
Remedied?
No Yes
End
Replace Control/Power Supply Board.
Pin No. 20 19 18 17 16 15 14 13 10 9 8 7 6 5
Signal +8V
EP
+40V
AC EL
+5V
(F.G) 10V (0V)
6 – 11
2 No spacing operation (The alarm LED Blinks)
Is carriage assembly binding or jammed?
No Yes
Check around space motor to repair the mechanism of space rack, back up roller,
ribbon feed mechanism, and carriage frame etc.
Replace space motor assy.
Remedied?
No Yes
End
Replace Driver Board
Remedied?
No Yes
End
Replace carriage cable.
6 – 12
3 Homing does not end normally
Yes No
Check around space motor to repair the mechanism.
(Space rack, ribbon feed assembly back up roller, carriage frame, support
protector and ribbon protector.)
Remedied?
No Yes
End
Replace space motor assy.
Replace space motor assy.
Remedied?
No Yes
End
Replace carriage cable
Remedied?
No Yes
End
Replace Driver Board
Remedied?
No Yes
End
Replace Control/Power Supply Board
6 – 13
4 Paper jam while paper insertion
Jam 1
Check around pressure roller mechanism.
Front pressure springs are narrow: 3 pcs; wide: 5 pcs) mounted properly or not.
Tension of all of front pressure rollers is properly.
Make sure of the fitting position of change gear shaft, change arm shaft and release
shaft are correct.
Check the ribbon protector.
Check the pull up roller cover is closed properly.
Jam 2 (wrinkled paper)
Pull up
roller cover
Platen
Paper
Ribon Protector
6 – 14
5 Smearing/Missing Dots
Does ALARM LED blink and display alarm?
No Yes
See Tables 6.2 and 6.3 for troubleshooting information.
Replace print Head.
Remedied?
No Yes
End
Replace Driver Board
Remedied?
No Yes
End
Replace carriage cable or space motor assembly.
6 – 15
6 Faint or dark print
Is the print head gap set properly?
Yes No
Adjust the print head gap (see section 5)
Remedied?
No Yes
End
Replace print Head.
Remedied?
No Yes
End
Replace Driver Board
Remedied?
No Yes
End
Replace ribbon feed mechanism
6 – 16
7 Ribbon feed trouble
Remove the ribbon cartridge.
Move carriage to left and right.
Does the ribbon drive shaft rotate?
No Yes
Change ribbon cartridge.
Remove ribbon feed mechanism.
Move carriage to left and right.
Does the ribbon drive shaft rotate?
No Yes
Replace ribbon feed mechanism
Replace space motor assy.
6 – 17
8 Line feed trouble
Turn the power off, and rotate the platen manually.
Does the platen rotate smoothly?
Yes No
Is the platen gear (L) broken?
No Yes
Replace platen assembly
Is the LF motor idle gear broken?
No Yes
Replace the LF motor assembly or LF idle gear.
Is the platen gear (R), idle gear or change gear broken?
No Yes
Replace the gear.
Set change lever to the rear position.
Does the platen rotate smoothly?
No Yes
Replace tractor feed assembly.
Replace LF motor assembly.
Replace LF motor assembly.
Remedied?
No Yes
End
Replace Driver Board
6 – 18
9 Malfunction of switch on operation panel
Is the CN1 of operation panel connected to the CN3 on the Driver Board?
Yes No
Connect the cable properly.
Replace operation Panel Board
Remedied?
No Yes
End
Replace Driver Board
6 – 19
10-1
0 Data receiving failure
Is the SEL LED blinking?
No Yes
Printer went into the print suppress mode.
Wait until printer to receives DC1 code, or change the menu item “Print
suppress-Ineffective” when the function is not required.
Is the I/F RS232C?
No Yes
To step 10-2
Does the SEL LED light up?
Yes No
Press SEL key.
Remedied?
No Yes
Does the printer receive data properly?
No Yes
To step 10-1 End
Disconnect I/F cable
Does the SEL LED light up?
No Yes
Change menu item I-prime to invalid, or check for defective cable.
Replace Driver Board
Remedied?
No Yes
End
Replace I/F cable.
6 – 20
10-2 (RS232C I/F) Printer I/F pin assignment.
Is the correct cable used? TXD 2 pin,
RXD 3 pin,
Yes No SSD 11 pin,
DTR 20 pin,
Change I/F cable DSR 6 pin.
Is ALARM LED blinking?
No Yes
See tables 6.2 and 6.3 for the troubleshooting.
Make sure of the parameters for RS232C in the menu are correct.
Baud rate
Bit length
Parity
Protocol
Busy signal and its polarity
Remedied?
No Yes
End
Is + 8V supplied on Driver Board?
Yes No
Remove RS232C I/F Board
Is the + 8V supplied on the Driver Board?
No Yes
Replace RS232C I/F Board
Replace Driver Board
Driver Board
CN2
20••••••••••••••••••
0V (pin10)
+8V (pin20)
6 – 21
Replace RS232C Board
Remedied?
No Yes
End
Replace Driver Board
APPENDIX A
APPENDIX A – 1
APPENDIX A
BIT IMAGE GRAPH IS — DOT DENSITY
(No adjacent dots allowed)
1/144 inch
Double speed
quad density
Double speed
double density
DoubleSingle
D
1/60 inch DOT
D/2
1/120 inch DOT
D/2
1/120 inch DOT
D/4
1/240 inch DOT
D = 1/60 inch
A – 1
A. PCB LAYOUT
PCB list
(1) Circuit board SRXC (Control/Power Supply)
(2) Circuit board SRXD (Driver)
(3) Circuit board LEOP (Operation Panel)
(1) Control/Power Supply Board (SRXC)
(2) Driver Board (SRXD)
(3) Operation Panel Board (LEOP)
Short Plug Setting Default
1 - 2:
2 - 3:
4 Mbit EPROM
1 M/2 Mbit EPROM
SP1
SP2 (A) - (B) and
SP3 (A) - (B):
SP2
SP3
2 - 3
SP2 (A) - (B)
and
SP3 (A) - (B)
13
To use program ROM of Q1.
SP2 (A) - SP3 (A) and
SP2 (B) - SP3 (B):
To use program ROM of Q2.
1 - 2: 2 - 3:
SP4
1 - 2
SP2
SP3
A
A
B
B
13
No relation for any setting.
Do not change default setting.
SP2
SP3
SP4
SP1
APPENDIX B
B – 1
B. SPARE PARTS LIST
Quantity per year: Indicates the recommended number of each part that should be ordered for
routine maintenance for one year for 500 units of printers and assuming that the printers are
operated for 2 hours/day of 600 hours/year. The following codes are used to indicate the number
of printers for which maintenance parts are ordered.
B – 2
Figure 11-1 Upper Cover Assy
1
2
3
B – 3
No. Part No. Description Q'ty
Q'ty
Remarks
Required
1 1PP4128-1186P3 Upper cover (N) 1 2 For ML3390
1PP4128-1231P3 Upper cover (W) 1 2 For ML3391
2 1PA4094-7305G10 Sheet guide assy (N) 1 2 For ML3390
1PA4094-7308G11 Sheet guide assy (W) 1 2 For ML3391
3 2PA4128-1237G1 Access cover assy (N) 1 2 For ML3390
2PA4128-1241G1 Access cover assy (W) 1 2 For ML3391
Figure 11-1 Upper Cover Assy
B – 4
Figure 11-2 Printer General Assy
1
6
9
8
2
7
4
5
3
11
10
B – 5
No. Part No. Description Q'ty
Q'ty
Remarks
Required
1 2PP4025-2871P21 Platen Knob 1 1
2 4YA4042-1545G302 Control/Power supply 1 9 Without ROM
board (SRXC)
3 4YA4042-1544G1 Driver board (SRXD) 1 9
4 4YA4042-1516G4 Operator panel board 1 3
(LEOP)
5 3PP4044-5360G3 Operation panel 1 2
6 3YS4011-1266P1 AC cord 1 1
7 4YA4023-3101G1 Print head (24) 1 10
8 40085501 Fuse 23702.5 1 10 For 120V
(125V 2.5A)
4YB4042-1551P1 Fuse 2151.25 1 10 For 230/240V
(250V 1.25A)
9 4YB4049-7105P1 Transformer assy 1 2
(ML3390 120V)
4YB4049-7106P1 Transformer assy 1 2
(ML3390 230/240V)
4YB4049-7105P2 Transformer assy 1 2
(ML3391 120V)
4YB4049-7106P2 Transformer assy 1 2
(ML3391 230/240V)
10 3PB4050-3429P1 PCB plate 1 2
11 40045601 FG plate 1 2
Figure 11-2 Printer General Assy
B – 6
Figure 11-3 Printer Unit
1
2
3
4
5
6
7
8
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
37
36
9
33
34
35
32
31
B – 7
Figure 11-3 Printer Unit
No. Part No. Description Q'ty
Q'ty
Remarks
Required
1 3PA4044-5002G2 Main Frame (N) 1 2 For ML3390
3PA4044-5152G2 Main Frame (W) 1 2 For ML3391
2 3PP4044-5012P1 Bottom paper end lever 1 1
3 4PP4044-5019P2 Pressure spring (F) 3 2 For ML3390
4PP4044-5019P1 Pressure spring (F) 5 4 For ML3391
4 4PP4044-5031P2 Roller holder (F) 3 6 For ML3390
5 8 For ML3391
5 4PA4025-3327G1 Front pressure roller assy 3 6 For ML3390
5 8 For ML3391
6 3PP4044-5015P1 Release shaft (N) 1 2 For ML3390
3PP4044-5157P1 Release shaft (W) 1 2 For ML3391
7 1PP4044-5021P1 Paper pan plate (N) 1 2 For ML3390
1PP4044-5158P1 Paper pan plate (W) 1 2 For ML3391
8 3PP4025-3320P2 Leaf spring (N) 1 2 For ML3390
3PP4025-3507P2 Leaf spring (W) 1 2 For ML3391
9 3PP4044-5011P1 Paper end lever 1 1
10 3PP4044-5013P1 Sensor lever 1 1
11 4PP4025-3340P1 Change gear 1 2
12 3PP4025-3341P1 Tractor gear 1 2
13 4PP4044-5020P1 Pressure spring (R) 3 2 For ML3390
3 2 For ML3391
14 4PP4044-5163P1 Pressure spring (W) 2 1 For ML3391
15 3PP4044-5033P1 Roller holder (R) 3 6 For ML3390
5 10 For ML3391
16 4PP4044-5017P1 Change arm 1 2
17 3PP4044-5014P1 Switch lever 1 1
18 4PP4044-5024P1 Idle gear 1 2
19 2PP4044-5016P1 Change lever 1 2
20 3PP4044-5023P1 Reset spring 1 2
21 3PA4044-5110G2 LF motor assy 1 4
22 3PP4044-5034P1 Rear pressure roller (N) 1 2 For ML3390
3PP4044-5162P1 Rear pressure roller (W) 1 2 For ML3391
B – 8
No. Part No. Description Q'ty
Q'ty
Remarks
Required
23 3PA4044-5025G2 Platen assy (N) 1 3 For ML3390
3PA4044-5159G2 Platen assy (W) 1 3 For ML3391
24 3PP4044-5010P1 Space rack gear (N) 1 3 For ML3390
3PP4044-5156P1 Space rack gear (W) 1 3 For ML3391
25 4PB4025-3377P2 Rack tension spring 1 1
26 3PP4044-5008P1 Guide rail plate (N) 1 1 For ML3390
3PP4044-5155P1 Guide rail plate (W) 1 1 For ML3391
27 3PP4025-2810P1 Adjust cam 1 1
28 4PP4044-5009P1 Carriage shaft (N) 1 1 For ML3390
4PP4044-5009P2 Carriage shaft (W) 1 1 For ML3391
29 3PP4044-5005P1 FG plate (L) 1 1
30 3PA4044-5050G2 Pull-up roller assy (N) 1 2 For ML3390
3PA4044-5165G2 Pull-up roller assy (W) 2 For ML3391
31 4PP4044-5116P1 Idle gear (24) 1 4
32 4PA4044-5041G2 Tractor frame assy (R) 1 2
33 4PA4044-5043G2 Tractor frame assy (L) 1 2
34 4PP4025-3335P3 Drive shaft 1 2 For ML3390
4PP4025-3335P4 Drive shaft 1 2 For ML3391
35 3PP4044-5046P1 Tractor sheet guide 1 2 For ML3391
36 4PB4044-5095P1 FG plate (A) 1 2
37 3PP4044-5089P1 Change gear shaft 1 2
Figure 11-3 Printer Unit
B – 9
Figure 11-4 Carriage Assy
12
9
8
6
14
11
10
1
13
5
4
7-1
7-2
3
B – 10
No. Part No. Description Q'ty
Q'ty
Remarks
Required
1 4PP4044-5061G1 Carriage frame set 1 2
2
3 4PA4025-3718G1 Back up roller holder assy 1 2
4 4PP4025-3398P1 Guide roller 1 2
5 3PP4044-5065P1 Guide roller holder 1 2
6 4YA4044-5120G1 Space motor assy (24) 1 4
7-1 3PB4044-5506P1 Head cable (9N) 1 5 For ML3390
3PB4044-5507P1 Head cable (9W) 1 5 For ML3391
7-2 3PB4044-5508P1 Head cable (24N) 1 5 For ML3390
3PB4044-5509P1 Head cable (24W) 1 5 For ML3391
8 3PB4025-1241P1 PC connector (36/40) 1 2
9 3PA4044-5070G2 Gear cace assy 1 3
10 3PP4044-5068P1 Head clamp holder 1 1
11 4PP4044-5067P1 Head plate 1 1
12 3PP4044-5064P1 Ribbon protector frame 1 2
13 4PP4025-3397P2
Back up roller holder spring
11
14 4PP4044-5066P1 Guide roller holder spring 1 1
Figure 11-4 Carriage Option Assy
B – 11
Figure 11-5 Option Spare Parts
1
2
3
4
5
6
7
[Pull-Tractor]
[Bottom-Tractor]
[I/F Board]
B – 12
Figure 11-5 Option Spare Parts
No. Part No. Description Q'ty
Q'ty
Remarks
Required
1 4PA4025-3608G1 Pull and bottom 1 2
tractor assy (L)
2 4PA4025-3603G1 Pull and bottom 1 2
tractor assy (R)
3 2PP4128-1239G1 Tractor cover assy (N) 1 3 For ML3390
2PP4128-1243G1 Tractor cover assy (W) 1 3 For ML3391
4 1PA4128-1277G1 Bottom push stand (L) 1 2
5 1PA4128-1277G2 Bottom push stand (R) 1 2
6 4PP4094-7385G1 Paper knife (N) 1 1 For ML3390
4PP4094-7386G1 Paper knife (W) 1 1 For ML3391
7 4YA4021-1050G1 LXHI-PCB (RS232 I/F) 1 3
APPENDIX C
RS-232C Serial Interface Board
(Option)
C – 1
APPENDIX C RS-232C SERIAL INTERFACE BOARD
1. GENERAL
This section describes the operation of the RS-232C Serial Interface board installed in the Printer
as an option using a start-stop synchronization and serial communications circuit. This serial
interface board is capable of transmitting and receiving simultaneously at speeds up to 19,200
bits per second. Two protocols are available: printer Ready/Busy and X-ON/X-OFF modes.
C – 2
2. OPERATION DESCRIPTION
2.1 Element Description
(1) 80C51 with MASK ROM
An eight-bit microprocessor controller that controls the following:
(a.) Serial interface protocol and data transfer through a serial port.
(b.) Message buffer.
(c.) Transmission of parallel data to the printer.
(2) SN75189
An RS-232C standard line receiver
(3) SN75188
An RS-232C standard line driver.
(4) 2764
An 8 kbyte ROM that contains the serial interface control program.
(5) HM6264
An 8192-byte static RAM used as a message buffer.
2.2 Circuit Description
A block diagram is shown in Figure C-2-1.
C – 3
OCS
P1P2P0
P3
TD
RD
IF WR
LS245
2764
ROM
8 KB
RD
TD
RAM
8 KB
Driver
+5 VD
10 VAC
+5 V
+9 V
–9 V
+5V
0V
±9 V power
supply circuit
Serial data
control line
Bus line
Control line
ADR latch
Receiver
DB0 to DB9
ADR/data bus
ADR bus
80C51
RST
CN1
Figure C-2-1 Block diagram
C – 4
2.2.1 Operation at power on
After power is turned on, an RST OUT signal is sent from the printer control board to reset the
printer. When the reset is canceled, the 80C51 CPU performs initialization. Initialization consists
of setting the 80C51 timer, and setting the serial mode.
2.2.2. RS-232C interface
The DTR, SSD, TD and RTS signals output by the 80C51 are converted to RS-232C signals
by line driver SN75188 (Q1) and sent to the interface.
In addition, signals DSR, CTS, CD, and RD on the RS232C interface are converted to TTL level
by line receiver SN75189 (Q2) and input to the 80C51.
C – 5
Ready/Busy
Received one
character?
Yes
Is DSR valid?
No
Buffer overflow?
Error?
Parity error
No error
Store the received
character in buffer.
Is the
printer in DESELECT
state or is the paper
low?
No
No
Yes
Yes
No
DSR High?
Yes
Store 40 H in buffer.
Yes
Yes
No
Yes
Is remaining
buffer space < 256?
Yes
No
Turn on the SSD signal.
Turn off the SSD signal.
Printer busy?
No
Output one character from the
buffer to printer.
No
Yes
No
Has 200 ms or
1s elapsed after SSD was
turned on?
Is remaining
buffer space > 256 during
receive time out?
2.3 Communication Procedure Flowchart
2.3.1 Mode a
Figure C-2-2
C – 6
Figure C-2-3
X-ON, X-OFF
Received one
character?
Yes
Is DSR valid?
No
Buffer overflow?
Error?
Parity error
No error
Store the received
character in buffer.
Is the
printer in DESELECT
state or is the paper
low?
No
No
Yes
Yes
No
DSR High?
Yes
Store 40 H in buffer.
Yes
Yes
No
Yes
Is remaining
buffer space < 256?
Yes
No
Printer busy?
No
Output one character to printer.
No
Yes
No
Has 200 ms
elapsed after sending DC3 is
turned on or has 1 second
elapsed?
Is remaining
buffer space > 256 during
receive time out?
Ready to send?
Ready to send?
Yes
Send DC1. Send DC3.
No
Yes
No
2.3.2 Mode b
C – 7
3. TROUBLESHOOTING FLOWCHART
3.1 Before Repairing a Fault
Before servicing the printer, ask the customer in what situation the trouble occurred and record
the response.
Before starting troubleshooting, operate the printer in the same situation as that at the time of
trouble occurrence to see if the same trouble occurs again. If not, perform the printers self test
and thoroughly test the printers functionality. If the trouble is reproducible proceed to the
troubleshooting section.
3.2 Troubleshooting
(1) The data is not received using a serial interface.
(2) Using a serial interface, the print data is omitted or the print operation is not performed.
C – 8
1 The data is not received using a serial interface.
(A protocol is set to READY/BUSY state, and BUSY LINE is in SSD + state.)
Is the OSC oscillation waveform as specified in Figure C-3-1?
No Replace the OSC.
Yes Is a RST signal in Q3 is as specified in Figure C-3-2?
No Check the RST circuit on the SRXC board.
A
Figure C-3-1
Figure C-3-2
V
T (ns)
+ 4 to + 5V
0 to + 1V
90ns
5V
0V
C – 9
Figure C-3-4
A
Yes Are ALE, PSEN, RD, WR, signals as specified in Figure C-3-3?
No Replace the Q3.
Yes Are (T1) SELECT and (INTO) BUSY signals low level?
No Check Q11 on the SKRA board.
Yes Are +9V and -9V input to Q1?
No Replace defective component in +9/–9 volt control circuit.
Yes Is pin 1 SSD signal of Q3 High level?
No Replace the Q3.
Yes Is pin 11 SSD of Q1 low level?
No Replace the Q1 or the CN1?
Yes Is the RxD of Q3 as specified in Figure C-3-4?
No Replace the Q2.
Yes Replace the Q3.
542ns
180ns
271ns
542ns
5V
0V
5V
0V
5V
0V
ALE
PSEN
RD/WR
Figure C-3-3
ST bit SP bit
5V
0V
5V
0V
RxD
SSD
C – 10
Figure C-3-5
542ns
5V
0V
5V
0V
WR
Q3-3
2 In receiving by serial interface, printing data is omitted or printing operation is not performed.
Are RxD and SSD of Q3 as specified in Figure C-3-4?
No Replace the Q2.
Yes Are, WR, and BUS signals of Q3 pin 3 as specified in Figure C-3-5?
No Replace the Q3.
Yes Is the level of a BUS signals at Q7 pins 2-9 the same as that of DB0-7 when
WR signal is started?
No Replace the Q7.
Yes Is 4 pin of Q6 identical to WR signal in Figure C-3-5?
No Replace the Q6.
Yes Check Q7 (LSI: 10S0210-42) in the SRXD control PCB.
C – 11
3.3 Local Test
3.3.1 Circuit test mode
3.3.1.1Setting
(1) Diagnostic test (set by menu)
(2) Test connector
Connect the test connector shown in Figure C-3-6 to the interface connector
Figure C-3-6 Test connector connection diagram
3.3.1.2Function
After the settings outlined in Section 3.3.1.1 are completed and power is turned on, the serial
interface checks the message buffer memory and interface driver/receiver circuit. It then prints
characters.
To start and stop this test, push the SEL switch on the front of the printer.
Details of this test are explained on the next page.
Equivalent to Cannon DB-25P
TD
RD
RTS
CTS
CD
SSD
DTR
DSR
2
3
4
5
8
11
20
6
M-521369 4-96 Printed in Japan
Oki Systems (Danmark) a.s.
Park Alle 382
DK-2625 Vallensbaek
Denmark
Tel : 436 66500
Fax : 436 66590
Oki Systems (France) S.A.
44-50 Avenue du General de Gaulle
94240 L'Hay les Roses
France
Tel : 0146 158000
Fax : 0141 240040
Oki Systems (Italia) S.p.A.
Centro Commerciale "II Girasole"
PAT. Cellini-Lotto 3. 05/B
20084 Lacchiarella (Milano)
Italy
Tel : 02 900 261
Fax : 02 900 7549
Oki Systems (UK) Ltd
550 Dundee Road
Slough
Berkshire SL1 4JY
United Kingdom
Tel : 01753 819819
Fax : 01753 819899
Oki Europe Ltd
Branch Office
ul Grzybowska 80-82
PL-00840 Warsaw
Poland
Tel : 02 6615407
Fax : 02 6615451
Oki Systems (Deutschland) GmbH
Hansaallee 187
40549 Dusseldorf
Germany
Tel : 0211 5266-0
Fax : 0211 593345
Oki Systems (Holland) b.v.
Kruisweg 765
Postbus 690
NL-2132 NG (2130AR)
Hoofddorp
The Netherlands
Tel : 020 6531531
Fax : 020 6531301
Oki Systems (Norway) A/S
Hvamsvingen 9
P O Box 174
N-2013 Skjetten
Norway
Tel : 0638 93600
Fax : 0638 93601
Oki Europe Ltd
Branch Office
International Bussiness Centre
Pobrezni 3
186 00 Praha 8
The Czech Republic
Tel : 02 232 6641
Fax : 02 232 6621
Oki (Europe) Ltd
Central House
Balfour Road
Hounslow
Middlesex TW3 1HY
United Kingdom
Tel : 0181 577 9000
Fax : 0181 572 7444
Oki Systems (España) S.A.
C/Goya 9
28001 Madrid
Spain
Tel : 91 5777336
Fax : 91 5762420
Oki Systems (Ireland) Ltd
The Square Industrial Complex
Tallaght
Dublin 24
Ireland
Tel : 01 459 8666
Fax : 01 459 8840
Oki Systems (Sweden) AB
Box 131
S-163 55 Spanga
Stormbyväegen 2-4
Sweden
Tel : 08 7955880
Fax : 08 7956527
Oki Europe Képviselet
International Trade Center
H-1075 Budapest
Bajcsy-Zsilinsszky út 12. 11. em. 204
Hungary
Tel : 361 266 6225
Fax : 361 266 0152
Oki (UK) Ltd
3 Castkecary Road
Wardpark North
Cumbemauld G68 0DA
Scotland
Tel : 01236 727777
Fax : 01236 451972
¡
People to People Technology
Oki Data Corporation
4-11-22, Shibaura, Minato-ku,
Tokyo 108, Japan
Tel: (03) 5445-6162 Fax: (03) 5445-6189
143

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