The station memory reverts to the bottom of the band after a couple of
>days with the power off. What is used to keep the settings and does
>anyone have a schematic?
To keep the memory, it probably uses a small battery, a "memory backup" capacitor (like 1 F, 5 V), or maybe an output on the power supply that isn't switched off along with everything else. Open it up and take a look - the battery or memory cap should be fairly obvious; the power supply might require a little poking around.
Also, did it previously remember its settings for a longer period of time? Some devices only have enough "backup" to ride through short power failures, not several days.
A quick Google reveals
formatting link
which claims that Teac was happy to supply a schematic. It's an audio pile site, though, so any claims should be viewed skeptically.
Followups set to sci.electronics.repair.
Matt Roberds