Alpine MRV-F 345 problem

[Electro11]

I have this amplifier at home. It has a problem.

When i want to start it, on display is message VLT for 1-2 secounds and then display shut down.

Also, i measure voltage on all output chanells, it has some DC voltage ,in one moment it si 12V, and then it start to fall down.

Does anybody know the answer for this problem?

Does anybody has service manual for this amplifier or just some schematic diagrams???

Thanks,


Damir


P.S. Sorry for my bad English

[Electro11]

Little update...


I have checked all output transistors,( 2SC5100 and 2SA1908) it has 3 transistors in everx channel. They are ok.
Power network is ok. There is +/-33V.
But, after few secounds, something is switching off PWM switching control circit (UPC494GS), on the 4 pin there is 5V..

I think that there is a some kind of problem in smd parts, but i dont have some schematics to test signals..

There is also chip CM47AUG for which I canot find any datasheet on the net.

Any idea? Any help? I am dieing for any schematics of this amplifier or this chip..

[kenray]

you can try pacparts.com, they should be able to get a service manual for your amp.

[Electro11]

I conntacted them but they only ship their things in USA. I am from Croatia and there is a problem. Do you know any other dealer of Alpine stuff?