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Hi I have problem on PM737 amp only one chanel working right is very faint

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  • sblagay Apr 03, 2011

    Hi thanks for you input man .yes I did try to do this and the fuses were not ok I have changed them and transistors as well,still fuctions only on one chanell .Chanell balance is in the midd.ok checked all that etc .how ever one speaker was not ok when this happened so I looked and sow that wire/wound restor.was falty so I changed that at least what I could .the speaker works ok when I plug it in on the chanel that works same the other one but still only on righth chanel A speaker and B when pushed in not joy let me know what you think then thanks Stephen

  • sblagay Apr 03, 2011

    Hi thanks for the input cheers for that yes I am the amp tech but not HIfi expert this is somthing new to me but I think its all the same ,I have solved half of the problem now we'll see next one I have other problem with my Pioner it has bad earth .all the mono jacks when touched are like live and not the hot one whcih is the midd. of the plug so when I put one mono say from tape chan which I dont use to earth its quiet and nice not a his so still need to solve this one on the other chanel cheers again and thanks Stephen


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First, be sure your speaker is good. Test both speakers one after the other on the channel that is working to actually confirm if it is not a speaker fault....

After that, cross check your speaker wires and make sure they are intact.

Now check your input wires make sure they are good. Also, check the speaker balance settings on the amp and make sure it is at the center.

Check your CD player connected to the amp, make sure it is set to Stereo and not Mono. Mono will make on one speaker work.

If non of the above seem to be the cause of the problem, then the problem has to be from the Output of the amp. Check the output fuse on the channel that is not working. If the fuse is intact, then it means you will have to change the output.

I hope the above makes sense to you. Let me know if you still need more assistance....

Good luck.

Posted on Apr 02, 2011

  • Walesarumi
    Walesarumi Apr 03, 2011

    Hello, are you conversant with electronic repairs? At this point the channel needs to be read with ohms meter in order to detect precisely which component is bad. This a better than doing trial and error. The meter reveal where the fault is coming from. I hope you understand this.


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