NAD 7600 "Power Envelope" Receiver
I have an NAD 7600 rcvr that has been slightly messed up ever since I tried to reset the 9Mhz/10Mhz AM switch nearly 15 years ago. (For anyone who might not know, in Europe the AM band is divided into 9Mhz segments; in the U.S. we use 10Mhz segments. I used it in a 9Mhz environment before moving to the U.S. in 1993.)
I made the mistake of pulling off the front panel and apparently "squeezed" something or got it misaligned when putting it back. The balance and volume controls work off solenoids, and ever since that time the balance control is just about uncontrollable. Sometimes it takes 10 minutes of jiggling to get balanced sound out of both speakers, and then it might drift off after a few minutes. It has made it very dicey trying to dub music from the receiver into my Mac; one channel often is "empty." The volume control is a little tight, but it works. Otherwise the receiver performs beautifully.
Currently the receiver is setting on a bench in the garage. I took it apart and looked it over again, but couldn't see the 9Mhz/10Mhz switch. The balance control unit seems buried behind the front panel, and I don't think I have the nerve to take it off again without knowing more about it.
About 3-4 years ago I sent email to someone at or affiliated with NAD asking for take-apart info, but never got a reply.
Does anyone have any experience working inside this receiver?