Marshall JCM2000-DSL401

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Carlosraj

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Joined 2010
#1
Hi


I am looking for the schematic for this amp. I downloaded one from the net but it looks different from my amp. The one I downloaded shows board No: DL40-60-02 but mine is DL40-60-00. The output volume is very very low. The signal from "D.I."out sound normall.



Thanks
 
#3
JonSnell Electronic said:
Unfortunately, Marshall Schematics and service manuals are copyrighted and I cannot share one.
Check the 100k anode load resistors and the signal through Relay 1.
Click to expand...




This morning, I tried the amp again, The volume is still very very low with master volume at 75%. When I put it full, the sound goes off. If I take the DI out or effect send to another amp, the sound is perfect, all the tone controls work. Now when I put in a signal to effects return, there is sound but very very low and no sound at full volume. I suspect the master volume control because when I opened up the amp, I realised that some one has worked on it, the soldering on the master volume pot(A200k) was a mess, I guess he removed the pot and then put it back. This is how it was soldered, Pin 1 and Pin 2 were soldered together, Pin3 and Pin 4 on its own, Pin 5, Pin 6 and Pin 7 were soldered together. I do not know whether this connection are correct as I do not have a schematic. I would need your advice whether this connections are correct. Thanks
 
#5
Thanks guys, the amp is back to normal now. The problem was the master volume pot. Pin5 is connect to a (-) voltage and Pin6 to a (+) voltage. This two pins were shorted together by someone who worked on it early. After isolating these 2 pins, the amp volume is back to normal.
 
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