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===maintenance===''A semi-skilled tech should have no problem keeping one on the air. Pay close attention to the AVR pass-transistor cooling fan (or replace it). Most problems of an intermittent nature with a rig this old can be traced to questionable connectors on the various circuit boards. Resoldering them is a tedious job but aside from replacing memory batteries (or re-peaking the VCO tuning coils, if necessary) is usually all that's required in the way of maintenance'' (for the TS-940S transceiver.) Citation [https://forums.hamisland.net/showthread.php/10730-Kenwood-TS-940S from N8YX]