Electronics > Repair

Rotel Amplifier Repair.

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urbis:
I have the following amp to have a look at.

Apparently, there's really low output and crackling on one channel.

http://www.hifiengine.com/manual_library/rotel/ra-920.shtml

I don't have a schematic, but I will upload some photos and a more detailed description of the fault tomorrow.

Any common things to look out for?

Thanks!

IanB:
Low output and crackling could be as simple as a bad joint. Check all solder joints and clean all mechanical joints/connections before looking deeper.

daveshah:
If you register on that site, you can download the service manual containing a schematic

urbis:
I never noticed that, thanks!

David_AVD:
Faults like that in old hi-fi amplifiers can be a bad electro coupling capacitor, signal transistor or op-amp.

I've even seen dirty preamp-amp RCA links (on rear panel) or dirty selector / tape monitor switches do that.

Once you have the circuit it should be easy enough to trace though it, comparing against the good channel.

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