I bought a used Pioneer GM-D8604 4 channel class D amplifier a few weeks ago.
I suspect that it has been repaired before. It looks like FETs and rectifier ICs have been replaced.
The problem I have been facing is that the "Power Rail Capacitors" make high pitched noise only when amp is cold.When amp warms up a bit noise becomes less. I replaced the capacitors 50v/2200uF and the noise problem had gone. But after a week the noise came back.
Can somebody please guide me what is causing these capacitors to go bad.
Sharing the amps schematic for this amp will be highly appreciable.
ABDUSSALAM
I suspect that it has been repaired before. It looks like FETs and rectifier ICs have been replaced.
The problem I have been facing is that the "Power Rail Capacitors" make high pitched noise only when amp is cold.When amp warms up a bit noise becomes less. I replaced the capacitors 50v/2200uF and the noise problem had gone. But after a week the noise came back.
Can somebody please guide me what is causing these capacitors to go bad.
Sharing the amps schematic for this amp will be highly appreciable.
ABDUSSALAM
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