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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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XR684F - Dead.
I have a Peavey XR684F that is dead. I've replaced a 15V regulator, 2
fuses, 1 op amp on digital reverb board, 1 diode on input board. Now, what I have is that it appears that the input side is working, hence, there is signal out of that board and level indicator LED's light up as signal increases. But my +/- 16V that is derived from the main B+/- is low but main B+/- is okay. This is not the same +/- voltage from my two regulators! I've checked/changed the two op amps in the output stage, removed all load from the circuit (voltages are good at zeners when I did this). Something seems to be loading these supplies down. There are 2 more IC's that I can't be sure is causing the problem (LM3080N). I'm wondering if anyone has seen a problem similar to the one that I have. Also, the outputs Q's are okay, there is also a low pop when powered on. Any help is greatly appreciated! Thanks! tp |
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