JL Audio XD400/4, XD600/1

ENGLISH

status led / Protection circuitrY

There is a single multi-color LED on the top

surface of the ampli fier to indicate the amplif ier’s

operating status.

1) F l as hi n g Gr e en : amplifier is p owering up,

audio output is muted.

2) Constant Green: amplif ier is on and

functioning normal ly, audio output is act ive.

3) Constant Red: Indicates t hat the

amplifier has exceeded its safe operating

temperature, putting t he amplifier i nto a

self-protection mode, which reduces the

peak power output of the a mplifier. When its

temperature returns to a safe level, the red

light will retur n to green and t he amplifier w ill

return to full-power op erating mode.

4) Constant Amber (yellow): Indicate s

that an over-current condition has occurred

and is accompanied by a mut ing of the af fected

channel(s). Because the muting behavior may be

very short in duration, it may manifest itself as

an audible, repetitive t icking noise i n the output.

Over-current conditions can be caused by a

speaker impedance lower than the optimum load

impedance range for the amplifier or a short-

circuit in the speaker wiring. The latter can result

from a short circuit between the positive and

negative speaker wires or between either speaker

wire and the vehicle ch assis. The “Status LED”

will remain amber for a few seconds, even if the

over-current condition is of a very short duration.

This functionality can be used to diagnose a

short-circuit by only connecting one channel at

a time. The “Status LED” will turn amber when

you connect the channel that is experiencing

the problem and turn the volume up.

5) LED off / Amplifier Shut s Off Unexpected ly

The only condition that w ill shut down

an undamaged XD400/4 completely is if battery

voltage or remote turn-on voltage drops below

10 volts. The “Status LED” will turn off when

this occurs. The amplifier will tu rn back on

when voltage climbs back above 11 volts. If this

is happening in your system, have your charging

system and power wirin g inspected.

For more information on troubleshooting this

amplifier, refer to Appendix D (pages 16, 17).

serVicing Your Jl audio amPliFier

If your amplifier fails or malfunctions, please

return it to your authorized JL Audio dealer so

that it may be sent in to JL Audio for service.

There are no user serviceable parts or fuses inside

the amplifier. The unique nature of the circuitry

in the JL Audio amplifiers requires specifically

trained service personnel. Do not attempt

to service the amplifier yourself or through

unauthorized repair facilities. This will not only

void the warranty, but may re sult in the cre ation of