My daughter bought an SX-650. She was clever enough to test it out before buying, but had only its tuner as a source. Seemed to work just fine. She brought it home for me to clean up and refinish the cabinet. I thought I would go ahead and check it out more thoroughly, so connected an iPod (known to be working with no problems) to the AUX. Right channel output is very low. Plugged it into TAPE 1 and TAPE 2...same result. Swapping input cables R to L and L to R makes no difference. I'm assuming that the fact that tuner output is good on both channels tells me the outputs (STKs) are good? If so, I sure would appreciate any suggestions on how to diagnose/isolate the problem. I can test components, measure voltages, do decent soldering work and follow directions, but I'm very weak with reading/interpreting schematics. All pots and switches have been cleaned with Deoxit, although given the symptoms my expectations for a Deoxit miracle were quite low (appropriately so, as it turns out!). Thank you for any help you can provide.