Harman Kardon AVR210 Manual page 2

Isolating audio problems in an AVR receiver
9) At this point you will be able to check and assure all output levels are the same.
10) IF THE OUTPUT LEVELS ARE NOT THE SAME STOP! Go no further. At this point
you will need to use the charts to see where you are losing your signal. The chart
shows the analog signal flow from the input jacks to the output jacks.
11) If the output levels are the same check the power out stage at the speaker out jacks.
12) If you find the levels at the speaker out jacks are OK, your problem will be in the DSP
part of the receiver.
Congratulations! You have now eliminated 90% of the electronics in the AVR and
confirmed that the problem is in the DSP section.
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