Yamaha C-4 Muting problem

Notorious · 11th July 2008, 03:28 PM

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..

Bigred · 12th July 2008, 06:13 AM

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.

Notorious · 12th July 2008, 08:03 AM

PM sent.. Thanx buddy..

11th July 2008, 03:28 PM	#1
Notorious diyAudio Member Join Date: Dec 2003 Location: Somewhere under the rainbow.. (Amsterdam)	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.. __________________ You might be a tubeneck if your date says "is that a tube in your pocket, or are you just happy to see me?" And it is a tube...

12th July 2008, 08:03 AM	#3
Notorious diyAudio Member Join Date: Dec 2003 Location: Somewhere under the rainbow.. (Amsterdam)	PM sent.. Thanx buddy.. __________________ You might be a tubeneck if your date says "is that a tube in your pocket, or are you just happy to see me?" And it is a tube...

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12th July 2008, 06:13 AM	#2
Bigred diyAudio Member Join Date: Jul 2007	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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