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Old 15th August 2008, 01:23 AM   #1
darthy is offline darthy  United States
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Default Yamah Amp Problem

My vintage Yamaha Integrated Amplifier CA-610 II takes approx. 2 MINUTES before the relay clicks and sound is produced. I have cleaned the switches/controls and looked over the board . Any suggestions are appreciated
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Old 15th August 2008, 07:23 AM   #2
Mooly is online now Mooly  United Kingdom
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Circuit !!! Failing that, measure the output offset voltage on each channel before the relay. If it's OK, it's possibly a problem with the protection circuit itself.
Also check for dry joints throughout but particularly ANY power transistor anywhere in the amp & PSU etc, older Jap stuff is terrible for this problem, and when you try and resolder you find the solder "won't take".
Remember the relay is either "telling" you there is a problem with offset voltage or the protection circuit itself is misbehaving. Checking the offset voltage will confirm which it is.
My moneys on a DJ or very unlikely, a transistor that is intermittant open circuit, which is another weird affliction of Jap transistors.
Good luck
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Old 16th August 2008, 10:01 AM   #3
darthy is offline darthy  United States
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If I shut the ampoff, then immediately turn back, on it only takes a few seconds before relays clicks open. Does this sound like something "other" than protection relay??
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Old 16th August 2008, 10:39 AM   #4
Mooly is online now Mooly  United Kingdom
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Hi,
Impossible to say. You have to take measurements to at least isolate which area the fault is in, even if you don't know how to fix it. A dry or intermittant transistor would certainly behave as you describe.
Do you know what we mean by "offset voltage" as that's the first thing to check when any protection circuit keeps the speakers disconnected.
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Old 16th August 2008, 11:23 AM   #5
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It could be an electrolytic cap in the power on mute circuit that has gone bad. I'd start by checking DC offset on the output of the power amp before the relay to narrow the problem down.
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Old 16th August 2008, 09:49 PM   #6
djk is offline djk
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http://www2.yamaha.co.jp/manual/pdf/...ntA/CA-610.pdf

Start with replacing the timing cap for the relay, C461.
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Old 21st August 2008, 08:43 PM   #7
darthy is offline darthy  United States
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I checked DC Offset at speakers and I get 5.1mv and 3.3mv. I am reluctant probing on the board with unit "powered ON". Is there any other test I can perform or should I just buy new capacitors and replace and hope? According to the shematic, there is about 33 electrolytic caps. Do I need to replace ALL of them? Maybe I have a bad transistor too?
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Old 21st August 2008, 08:59 PM   #8
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At the risk of repeating myself:

"Start with replacing the timing cap for the relay, C461."
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Old 22nd August 2008, 01:59 AM   #9
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Check for leaky caps,cracked solder joints.
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Old 22nd August 2008, 03:29 AM   #10
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actually you want to check for the DC offset at the output inductor on the amp board.
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