Harman Kardon 930 lost channel. Hoe to trouble shoot ?
here is a tip,
wire an outlet box with a duplex outlet and a switch.
wire the outlet so the two outlets are in SERIES and in series with the switch..
Plug your unit into one outlet and plug a 100 Watt INCANDESCENT light into the other outlet.
Use the switch to turn on/off the power. This makes it easy to turn OFF all the power when you are working on the unit.
Also the bulb will limit the current if there is a fault. If the bulb glows brightly, there is still a fault and this will protect the new parts that you just put in.
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