My integrated stereo amplifier periodically stops working. Why does vacuuming it out fix it? Answered
I've written an Instructable about this here:
How to Fix Your Stereo Amplifier (Harman Kardon HK 620). It just stopped working, and again I vacuumed it out, fixing it. Others have shared similar experiences, but I don't know why it works.
When the amp "stops working" everything but the amplifier appears to work: all the LEDs turn on, external devices plugged into the switched and non-switched 120 VAC ports energize, and the signal path out of the "tape 1 out" works.
There's no visible dust inside the amp. I don't think it's a loose wire because "pretend" vacuuming (or shaking for that matter) has no effect.
Do you have any ideas?