Alpine mrd-m1005 schematics for repair

[Mr.Monkeys]

Hi everyone,

This amps been sitting around ever since it stopped working for me awhile back and i'm finally going to attempt to fix it. It turns on and powers up fine from what i can tell, but there is no output for sound. I believe i have replaced the output transistors because one of them were bad in-circuit and off board. At least i think they are the output transistors (c3421). replaced them but still nothing, and when i check one of them in-circuit the reading on the multimeter from base to collector is ~.4 not sure if its suppose to like that, off circuit it measures .584 after its been on the board and it measured .598 before it ever touched the board. Is there something else i need to check? Sorry, i'm just giving this a try because i like to try to fix things. Does anyone have the schematics?

Also i don't know if this problem is related, but none of the changes done to the filters, subsonic, lp etc, will show a change on the digital lcd, like when i change the crossover hz, it stays the same on the display.

 

[robbysankar]

alpine mrd-m1001 lcd displays when powered up but no rail voltage present.

 

[Perry Babin]

Email me if you need the service manual.

babin_perry@yahoo.com

 

[robbysankar]

thanks for the info mr Babin.Turns out the ground wire came loose and touched the chassis. this in turn took a few diodes out.with the schematic i was able to replace them and got it going again.

P.S sorry for the late reply.

 

[clintnz]

Hi I'm after the same schematic for this amp my friend really wants this fixed any help would be much appreciated

 

[Perry Babin]

Email me for the SM.

If you have any other questions about the repair, start a new thread.

xbabin_perry@yahoo.com

 

[Alfgtz]

Hi I have mer to the problem vlt. Amp alpine m1005 help me please

 

[Perry Babin]

Please don't post in a repair thread that was started by someone else unless you are trying to help them.

Start a new thread if you need help with a repair of your own.