Bedienungsanleitung JL Audio MHD900 (Seite 15 von 24) (Englisch)

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“STATUS” LED / PROTECTION CIRCUITRY

There is a single multi-color LED on the

control panel of the amplifier to indicate the

amplifier’s operating status. This LED’s behavior

is as follows:

1) Flashing Green: amplifier is powering up,

audio output is muted.

2) Constant Green: amplifier is on and

functioning normally, audio output is active.

3) Constant Red: lights to indicate that the

amplifier has exceeded its safe operating

temperature, putting the amplifier into a self-

protection mode, which temporarily reduces

the peak power output of the amplifier. The

red light will turn green and the amplifier will

return to full-power operating mode when its

temperature returns to a safe level.

3) Constant Amber (yellow): lights to indicate

that at least one channel is in overcurrent

protection mode. This could mean that the

impedance of the speaker load connected to

the amplifier is lower than the optimum load

impedance range for the amplifier. When this

light is on, a protection circuit engages and

reduces the power output of the channel(s)

experiencing the problem. This can manifest

itself as audible distortion.

The amber indicator will also light when

a short-circuit is detected in the speaker

wiring (this can be a short between the

positive and negative speaker wires or

between either speaker wire and the vessel

chassis). This can be used to diagnose a

short-circuit by only connecting one of the

amplifier sections at a time (“Front” or

“Rear” or “Sub” channels). The amber LED

will light when you connect the section that

is experiencing the problem and turn the

volume up. Note that a short in the speaker

wiring may show an alternating red/green

status light with no signal (volume down).

4) Alternating Red and Green: lights to indicate

that the amplifier is experiencing a fault that

may require service of the amplifier, its wiring

or the vessel’s charging system. Audio is muted

when this fault occurs. The most likely cause

of this fault is a low supply voltage condition.

If battery voltage drops below 17 volts at any

point, the amplifier (except for the “Status”

LED) will shut itself off to protect itself and the

vessel’s charging system. If the Remote Turn-

On voltage drops below 12 volts, the “Status”

LED will also turn off.

The amplifier will turn back on automatically

when voltage climbs back above 18 volts. This

shut-down and turn-on behavior may happen

in a rapid cycle when bass-heavy program

material causes a weak charging system to

momentarily dip too low. If this is happening

in your system, have your charging system

inspected to make sure it is working properly.

If no problem is found with the supply voltage

to the amplifier and you are still seeing

alternating Red and Green on the “Status”

LED, check that there are no short-circuits to

chassis ground in any of the speaker wiring

in the vessel. Disconnect speaker connectors

from the amplifier one-by-one to check.

If no problem is found with the supply or

remote voltage, disconnect everything except

power/ground/remote. If the amplifier is then

turned on and displays an alternating red-

green, the amplifier needs service.

For more information on troubleshooting this

amplifier, refer to Appendix D (pages 20, 21).

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JL Audio MHD900 Seite 15

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