Question about Jl Audio Car Audio & Video
Light is on so suggests power, earth and remote turn on cable all ok. Now you just need to test the RCA signal and the AMP output. I take it you have used low level RCA as the input from the head unit? (two cables usually red n white although can somtimes be other colours) best way is with substitute amp n speakers etc although can be done with osciliscope or headphones. Once it is established the RCA signal is fine then you can check the speakers from the amp. disconnect them at the amp and put each of the two wires briefly to a battery, any battery will do e.g. 9v PP9 or 1.5v AA etc you should hear a pop from each speaker as you do it. that proves the speakers and wiring to them.
If there was no signal from the RCA the cables may be bad - requires testing from head unit to amp
failing that the RCA output may be reduced or turned off via a menu in the head unit
Or the RCA output from the unit may be knackered.
Sorry its a bit long hope it helps
Posted on Jul 04, 2008
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Posted on Jan 02, 2017
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Sony generally drives their power light from a source that does not rely on the amplifier's switching power supply. This means that it's not a good indicator as to the health of the amplifier.
As long as you have B+ and remote voltage, it will light up. Since you've tested the speaker and the signal source, I think the amplifier is likely defective.
Oct 17, 2007 | Sony XM-2200GTX Car Audio Amplifier
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