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Marantz PM94 Please Help
Marantz PM94 Please Help
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Old 6th March 2010, 10:38 AM   #1
claude2007 is offline claude2007
diyAudio Member
Join Date: Mar 2010
Default Marantz PM94 Please Help

Hello there,
Hope youíre well?
My name is Claude I am a retired electronics engineer unfortunately had to retire because of a disability getting worse.
I have purchased a Marantz PM 94. Unfortunately when I used the amplifier no speaker relays operated. So then I soldered every joint on both power amp circuit boards. Iíve replaced all the heat sink paste and the washes on the output transistors. Then the PM94 worked okay for a couple days. Although one power amp board did get slightly hotter than the other side.
I would assume that this is a bias problem so I will be very grateful if you could send me some instructions on how to bias both of the power amplifier boards equally. Could you please send me some instructions on how to do this? This would be much appreciated.
But now thereís an even bigger problem the amplifier has gone off altogether and the Speaker relays donít come in at all.
The front LEDs are still on. But as I said there are no Speaker relays switching in at all.
Any help with this would be very greatly appreciated.
my e-mail address is
many thanks in advance.
All the very best:
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