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Got a scope? Remote issues are easy to fix with a scope, diddle stick, and the remote.
Most remotes consist of a few stages (often 2-4) of wide is band amplification, that then feeds tuned filters and relay driver amps for each function. I usually put a scope on the point at which the wide band amp splits off into the filters. If I get signal when pushing buttons on the remote then the wide band amp works and the filters need to be tuned or the rely drivers have issues. If I don't get a signal I scope the ultrasonic mike input to the chassis and if I get signal there then I troubleshoot the wide band amp. Let me see if I have a schematic for something similar...Zenith SC RX's (and most ultrasonic chassis) were all very similar just add or delete a stage between models.
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