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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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Sony STR-DB795 crackle noise in front L channel
Hi
First at all I have to say that my English is little bit rusty, but hopefully you understand what I try to say. I have this Sony 7.1 channel receiver which makes a crackle(is it right term?) noise in front left speaker (A+B) and headphones(left ch. also). The noise appears when I adjust master volume, input selector or mute. There isn't any differences if I adjust these from remote or front panel. When I adjust master volume, noise appears only between these dB levels, which is strange: -53,5 -54,0 -61,5 -62,0 -69,5 -70,0 -77,5 -78,0 -85,5 -86,0 -93,5 -94,0 Without this noise, receiver works properly. I have service manual for this and I already checked these: -muting transistors - ok -op-amps and capacitors near audio selector and electrical volume - ok What next? |
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