Hello Guys,
on my IS250 2006 the MARK LEVINSON AMP (Harman Becker 86280-0W360) died (probably moisture) with full short on -12V Batt Power. I could repair the amp if there is any schematic, because may SMD parts inside have no markings.
Here is my question: Does anybody know if a detailed schematic is available in the original service documents, no only a pinout of the connectors. I thinks I found detailed info about the head unit in the web, but Im not sure if there exist any schematics oder service manual from the amplifier.
If there exists such documents, I could buy or download them.
regards
ano1

 

If it was made for Lexus only, it may be very difficult to find. Open the unit up and search using pcba identification.

FWIW many units take a hit with a battery lead reversal. There are shunt diodes that take energy to ground, and can short if this event occurs.

Are you capable of component level troubleshooting? It sound like it or you wouldn't be asking. Look at the input and start tracing.

When was the last time it worked, what symptoms did it have before it died.

Post some high resolution pictures...