Bedienungsanleitung JVC DR-MV1SUC (Seite 11 von 24) (Englisch)

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(No.YD006)1-11

• As the counter indication and remaining tape indication

are not displayed FDP during the EVR adjustment

mode, check them on the TV monitor screen.

• When performing the EVR adjustment, confirm that the

FDP indication is changed to the EVR mode.

4.2 Mechanism compatibility adjustment (VHS SECTION)

Notes:

• Although compatibility adjustment is very important, it

is not necessary to perform this as part of the normal

servicing work. It will be required when you have re-

placed the A/C head, drum assembly or any part of the

tape transport system.

• To prevent damaging the alignment tape in the compat-

ibility adjustment, prepare a cassette tape (for self-re-

cording/playback), perform a test on it by transporting it

and making sure that the tape is not bent by the tape

transport mechanisms such as in the guide rollers.(See

Fig.4-2b.)

4.2.1 Tension pole position

Notes:

• This adjustment must be performed every time the ten-

sion band is replaced.

(1) Play back the back tension cassette gauge (A).

(2) Check that the indicated value on the left side gauge is

within the specified value (G).

(3) If the indicated value is not within the specified value (G),

perform the adjustment in a following procedure.(See

Fig.4-2a.)

a) Remove the top frame, cassette holder and side

frames (L/R) all together. (Refer to the SERVICE

MANUAL No.86700 [MECHANISM ASSEMBLY].)

b) Rotate the loading motor gear to move the control

plate so that the triangular stamping to the left of the

“P”stamping is aligned with the stamping (a) on the

main deck. This positioning is mode (B1).

c) Adjust by turning the adjustment pin so that the tip of

the tension arm is aligned with the stamping (b) on

the main deck.

d) Rotate the reel disk (S) by about one turn clockwise

and make sure that the round hole of the adjustment

pin is located in the “OK” range. If it is outside this

range, restart the adjustment from the beginning.

After completion of the adjustment, rotate the loading gear

motor to return it to the mode (B2) position.

Fig.4-2a

4.2.2 FM waveform linearity

(1) Play back the alignment tape (A1).

(2) Apply the external trigger signal to D.FF (E), to observe

the V.PB FM waveform at the measuring point (D).

(3) Set the VCR to the manual tracking mode.

(4) Make sure that there is no significant level drop of the V.PB

FM waveform caused by the tracking operation, with its

generally parallel and linear variation ensured. Perform the

following adjustments when required. (See Fig. 4-2c.)

(5) Reduce the V.PB FM waveform by the tracking operation.

If a drop in level is found on the left side, turn the guide roll-

er of the pole base assembly (supply side) with the roller

driver to make the V.PB FM waveform linear.

If a drop in level is on the right side, likewise turn the guide

roller of the pole base assembly (take-up side) with the

roller driver to make it linear. (See Fig. 4-2c.)

(6) Make sure that the V.PB FM waveform varies in parallel

and linearly with the tracking operation again. When re-

quired, perform fine-adjustment of the guide roller of the

pole base assembly (supply or take-up side).

(7) Unload the cassette tape once, play back the alignment

tape (A1) again and confirm the V.PB FM waveform.

(8) After adjustment, confirm that the tape wrinkling does not

occur at the roller upper or lower limits. (See Fig. 4-2b.)

[Perform adjustment step (9) only for the models equipped

with SP mode and EP (or LP) mode.]

[Perform adjustment step (9) only for the models

equipped with SP mode and EP (or LP) mode.]

(9) Repeat steps (1) to (8) by using the alignment tape (A2).

Fig.4-2b

Digit-key0123456789

Code 20 21 22 23 24 25 26 27 28 29

Signal (A) • Back tension cassette gauge [PUJ48076-2]

Mode (B1)

(B2)

•PB

• Eject end

Adjustment part (F) • Adjust pin [Mechansim assembly]

Specified value (G)

• 25 - 51 gf•cm (2.45 - 5 x 10

-3

Nm)

Signal (A1)

(A2)

• Alignment tape(SP, stairstep, NTSC) [MHP]

• Alignment tape(EP,stairstep,NTSC) [MHP-L]

Mode (B) • PB

Equipment (C) • Oscilloscope

Measuring point (D) • TP106 (PB. FM)

External trigger (E) • TP111 (D.FF)

Adjustment part (F) • Guide roller [Mechanism assembly]

Specified value (G) • Flat V.PB FM waveform

Adjustment tool (H) • Roller driver [PTU94002]

ADJUST PIN

TENSION ARM

Stamping(b)

Stamping(a)

CONTROL PLATE

(

)

GUIDE ROLLER

(

)

GUIDE POLE

Improper

Proper

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