Hey folks. I'm working on a JCM2000 DSL100 for a friend. It had no sound when I got it. HT fuse was blown. I replaced the HT fuse ,and it powered up ,but bias was crazy ( I know this is a known issue) The board is revision 4 I think. I bought a new board (revision 20) ,and new tube set. (the old quad was two sets of different tubes) Replaced the board ,and tubes. Biased just fine ,but I have no sound. I'm thinking I got some cables in the wrong places even though I wrote them down I could have easily made a mistake. I tried using the schematics I have ,but they don't seem to match the ones I KNOW I had connected right? I'm guessing I have a cable in the wrong spot ,but I need the right schematics to check them.
UPDATE: I think I found the right connection table ,and schematics. So everything seems to be connected correctly according to that ,but I still have no output only a low hum ,and when I was checking voltages on the power tube V5 pin 3 there was some noise as I was touching the pin (sounded like a relay turning off ,and on) ,and arcing to the probe tip then the HT fuse blew again? I tried to upload the schematic I'm using , but it has failed every time.
Marshall 2000 DSL_full.pdf
UPDATE: I think I found the right connection table ,and schematics. So everything seems to be connected correctly according to that ,but I still have no output only a low hum ,and when I was checking voltages on the power tube V5 pin 3 there was some noise as I was touching the pin (sounded like a relay turning off ,and on) ,and arcing to the probe tip then the HT fuse blew again? I tried to upload the schematic I'm using , but it has failed every time.
Marshall 2000 DSL_full.pdf
Comment