Output

gejettest said:

... When checking a receiver's speaker output, what am I looking for? Voltage, amperage? What?...I'd like to fix it myself, any thoughts, troubleshooting?

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If your receiver has a 5-channel stereo mode then set it to that and feed a stereo signal to it.
Whatever voltages you read on the front channels you should also read on the rears. (+/- a few dB depending on the trim levels)


Did both surround channels fail previously? If they did (and if both failed again), then your surround amplifier module may find the surround speakers to have too low of an impedance.
Honestly, if you find a way of repairing it, I think this will happen again.
You may just have to upgrade to a better made receiver to avoid this from happening in the future.

gejettest said:

I have a Harmon Kardon AVR 5.1 and the rear channels went out, got it fixed and now they are out again...

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- Which model exactly?
- What speakers are connected, and are you really cranking it up? (Don't lie!)
- Are you CERTAIN there are no little stray wires out of the speaker cables shorting out?
- Disconnect each speaker cable and apply an ohmmeter, should read like 3-6 ohms DC. To really check impedance of midrange and tweeter you'd need some kind of impedance setup; I think you can use https://www.roomeqwizard.com plus another amp and resistor, but I haven't tried it myself, I used a MLSSA setup and sometimes LMS.
- How exactly did it "go out again"? Funny noises? Just booted up dead? Stereo is still fine?
- How did you fix it the first time?