schematic request: harman kardon pm655

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Hi,

I have a Pm655 HK integrated amplifier and if appears to have some problems. One of the channels appears to be shot - i.e very low volume with lots of distorion. Any thoughts?

Also, I'm looking for a schemtic for this amplifer so that I can test some of the components.

Any help would be appreicted., John
 
HK PM655

flh59 said:
Hi,

I have a Pm655 HK integrated amplifier and if appears to have some problems. One of the channels appears to be shot - i.e very low volume with lots of distorion. Any thoughts?

Also, I'm looking for a schemtic for this amplifer so that I can test some of the components.

Any help would be appreicted., John


Hi John,

I know your post is a few years old but I was wondering if you had any luck with your amp. I have a PM655 with the same problem.

Colin
 
Hi I had the same issue and found that a really good cleaning including using lots of de-oxit on all the controls inside brought it back to life. I read that this amp is higher maintenance for cleaning than is normal.
cheers wolfgang
 
Harman Kardon PM650

Balance doesn't work. Mono works through both speakers. Stereo only works through Left channel. Reverse works through Right Channel. Stereo doesn't work through both channels. Only Mono works through both channels.

Both speaker sets used to work. Then balance control failed on the speaker set 1. So I changed to speaker set 2 and it worked. After an hour, speaker set 2 balance control also failed.

What do I do? Suggestions appreciated.
 
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