petehall347
the brandy coffee man
looks like the vol pot is possibly broken internally then . or there could be a problem with the loudness circuit .maybe the switch . try loudness on and see if it evens up .
Goshieeeee..........I just make a big stupid mistake. While I measured the voltage of pin 1, accidently touch pin 2 togather. I hear a pop-spark sound. After that happening, I only got -0.20 vdc from pin2(used to get -51). Now Relay is not even clicking. Tried to repair uneven balance of sound and made worse..looks like the vol pot is possibly broken internally then . or there could be a problem with the loudness circuit .maybe the switch . try loudness on and see if it evens up .
I just went over everything all over again for repairing. It was Stupid try....they are pin 1 and 2 from awm 124 (relay board). After that happening, I checked all diodos using my multimeter and found mz130 (d9 diodos) on power supply board(awr165) get bad (possibly fried). All other diodos for boards seem fine. Does it make sense to you? Or that diodos is not related with this happening. Do I need check other things? Anyway thanks for your help and have good night.hold one why are you measuring voltages ?
anyway what's done is done and needs fixing .what pins are you talking about ?
i wont see your reply until tomorrow its near 1am here
Thanks for reply. I only had short time available today morning before work, so I had quick check for voltages on power supply board, q3, and q4. I will do resistors and diodos once I go back home today. I got these numbers so faryou need to check everything in the -50v supply .including q3 q4 and all resistors .
also check d11
Petehall, I have a dumb question. I want to make sure about test you mentioned earlier.. you need to pull the transistors out for testing .
voltage testing obviously in circuit and if odd readings with no apparent other fault its pull the transistor out of circuit for testing on diode test or hfe test if you have that function on your meter .
Finally I tested Q3, Q4, ALL resistors, and diodesyou need to check everything in the -50v supply .including q3 q4 and all resistors .
also check d11
Yes I ordered resistors, diodes, and Q3. Ended up with ordering all other transistors and diodes for power supply board in advanced since they are not expensive. 3 to 5 days to get them into my house. I will let you know once I install them. Thanksyes get them ordered .
I got and installed all parts. It is on and working again although uneven volume issue still exist. Thanks for your kindly help. I guess I should look for new volume pot and replace old one. Or I can disassemble old volume pot and clean inside really hard.yes get them ordered .
yes looking that way ..