Question about Amplifiers & Preamps
I left my Denon pma 737 on for 12 hrs by mistake and now there's nothing but low signal and static. Can it be repaired?
Determine if it is both left and right channels. If it is then you are looking for something that is common to both channels as the cause. It could be something to do with the tone circuit, perhaps an IC, another suspect is the bias section. And if only in one channel then at least you have something to compare it when seeking the fault.
Posted on Oct 12, 2009
Sounds to me like a bad capacitor, but not sure. I would look inside for any slightly bulging capacitors or capacitors whose plastic wrappings have melted or shrunk or cracked (most caps are cylindrical). Please unplug first and be careful inside there and do not touch anything. I actually came across your post while looking for info on what I think is the same amp my brothers had but blew, and I was going to ask if they still had it so I could repair it. I've been very successful at repairing my electronic equipment such as Altec Lansing Model 95 speaker crossovers, power supply in Emu Emax II, and almost everything else in my studio.
Posted on Oct 29, 2009
If you can follow the circuit from the input of the cd play socket inside the amp itself you might come accross a Memory Retention Capacitor that supplies an IC. If you do. I can't for certain say one will be there, I would replace it, it might be the cause of the lost memory of your device.
If you don't know what a M R C looks like, they are like electrolytic types, but haven the appearance of being squashed. The value will be low only 0.22uf etc and the volts very low say 5.5. The PC board marking will be different to a normal capictor.
Posted on Nov 24, 2009
Well, it seems you have your finger on the source of the problem. If accessible, try some tuner cleaner inside the potentiometer.
Posted on Mar 05, 2010
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