I just picked up a very nice Yamaha CR 2040 today, about an hour from where i live. I already have a Yamaha CR 2020 receiver but the CR 2040 was too sweet of a deal to pass up and it was in excellent shape. I hooked it up today to my Polk Monitor 7As and it works and sounds great and is quite powerful (125 watts @ OHMs) but it has a scratchy sound when I turn up some of the knobs (the volume knob or balance knob, for instance). It plays perfectly when I do not adjust the knobs. Does this mean it may just need a cleaning? The prior owner told me he had it in storage for the past year. If so, what is the best way to clean it? Or should I just take it to a tech to clean it for me? I do not have any electronics experience and am somewhat mechanically challenged but should be able to do a simple fix if that is all it might be. It is a great sounding receiver and I am ecstatic to add it to my collection.
Now I just want to get it working perfectly. I'd appreciate suggestions on how to do ao. Thanks.