electronics, repairs, service manuals and datasheets discussion community for the repairs professionals and technicians
FAQSearchMembersGroupsRegisterProfilePM'sLogin/Out
Alpine MRV-F 345 problem

 
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs
View previous topic :: View next topic  
Author Message
Electro11
Guest





PostPosted: Wed Nov 12, 2008 4:59 pm    Post subject: Alpine MRV-F 345 problem Reply with quote

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 Smile
Back to top
Electro11
Guest





PostPosted: Sun Nov 23, 2008 7:01 pm    Post subject: Reply with quote

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..
Crying or Very sad
Back to top
kenray
Guest





PostPosted: Tue Nov 25, 2008 5:30 pm    Post subject: Reply with quote

you can try pacparts.com, they should be able to get a service manual for your amp.
Back to top
Electro11
Guest





PostPosted: Tue Nov 25, 2008 11:22 pm    Post subject: Reply with quote

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?
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs All times are GMT
Page 1 of 1

 
Jump to:  
You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Електроника София - Service Manuals Free Download - Prikachi - Service Diagrams

Free TV Schematics Download - HARDW.net - Pinout Master - Jabse Search - Jabse.InK  - Pulsator

Connector Pinout Forum - Новини - SnimkiOt.com - безплатен DNS - Whois разузнаване - Poblizo.com : пътешествия