Yamaha C-4 Muting problem - diyAudio
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Old 11th July 2008, 03:28 PM   #1
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Default Yamaha C-4 Muting problem

Hi gang..

Well, I just bought me a Yamaha C-4 preamp.. Great thingy, but it takes about two minutes for muting relais to switch on.
I thought it would be a problem in power supply so I replaced old caps with new Elna's, but no avail. I don't have service manual and guy's who run repairs for Yamaha equipment here in Holland won't give me any information. Only thing they are willing to do is take C-4 in for repair. Since I think this is no way to treat the customer, there's no way I'd let them do any repairs.
My question is, do any of you guys know how to fix the problem?
I know how muting works (darlington switching on relais after capacitor is loaded) but before I go replacing all caps, I'd like to hear your opinion.
Thanx in advance for any suggestions..
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Old 12th July 2008, 06:13 AM   #2
Bigred is offline Bigred  Canada
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I believe I have a service manual and schemtic for the C-4. Send me an email and I'll see what I can do.
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Old 12th July 2008, 08:03 AM   #3
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PM sent.. Thanx buddy..
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Old 15th July 2012, 01:28 PM   #4
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I have similar problem with my c4. When cold, it takes about a minute when relay near vol pot receives power. There's no such problem when preamp has been running and hot. Did you find a cause of this problem?
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