Alpine mrd-m1005 schematics for repair - diyAudio
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Old 25th August 2009, 05:49 AM   #1
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Join Date: Aug 2009
Question Alpine mrd-m1005 schematics for repair

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.
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Old 22nd March 2011, 07:16 PM   #2
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Join Date: Dec 2009
alpine mrd-m1001 lcd displays when powered up but no rail voltage present.
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Old 22nd March 2011, 07:52 PM   #3
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Join Date: Nov 2003
Location: Louisiana
Email me if you need the service manual.
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Old 8th April 2011, 09:01 PM   #4
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Join Date: Dec 2009
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.
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