Brierpath

Folks,

I just looked into why the Mark Levinson system in my 02 GS went silent on me the other day. The main 30A radio fuse was blown in the fuse block by the battery. I pulled the amp out from under my nav unit and opened it up. This is a quite complex power amp and nothing looked amiss. I started tracing the power input into the power supply section of the amp. Both power mosfets were shorted! I looked these up and they are 75A 60v n-channel devices. I bought a pair of replacements that were rated a bit better, just because that is what was available.
Replacing them brought it back to life.
Previous threads mentioned a place that could repair this amp for around $700.00. If you know anybody who has made a living doing electronics work, they could do this for you. The circuit board is multi-layer and is conformal coated. Very similar to military stuff I worked on in the 80s. Someone who is merely a hacker may or may not have success getting the transistors replaced without destroying the board. The parts were $4.00, but as I said, it is no picnic. These factory devices should have had a higher rated voltage in my opinion, but did last 15 years.
I will take a picture of the device location and forward later.

Thanks,
Bill




Bill

Mr Jokster

iTrader: (8)

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