tutor turtle 7 Posted March 17 Share Posted March 17 I have a Sunfire Cinema Grand Signature, five channel (Serial 99051200081) that has a missing capacitor on the Left Rear Channel amplifier. (board # 731-026-?) C41. One Leg goes to a 5W resistor R76, the other to 1/2 watt zener diode Z2. I have a few loose pages of schematics I'm not sure that they are for this particular model. This one has the big iron core power transformer, not the toroidal. I am hopping this little missing cap is causing my noise issue There is a little buzzing on start-up (goes away) The main issue is this unit seems to be particularly prone to picking up any stray EMI. My shop is electrically quite, but if I run anything that makes sparks, like a wire wrap gun, it picks it up and comes loudly through the speakers. Clearly a shielding issue. The big power supply caps and bridge rectifiers have been replaced. As well as the 11 supply caps (1,000 uf @16V) each of the three power amp boards. (a suggestion I read on this website's forum) What I could use are the correct schematics and service manual that shows how to set bias and offset. T-T, Vintage HiFi Restoration, Link to comment Share on other sites More sharing options...
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