I have a Magnavox model zc352mw8a dvd recorder 120vac. I can program the channels into it off of an antenna. The channels are there but then I can power the unit off then back on and maintain the programmed channels. But if I power the unit off for a period of a hour or more it looses the channels. They are no batteries in this unit for cmos for it is a cabinet mount player.
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These units sometimes use large capacitors (large in value not size) instead of batteries. Open up the unit and look for a cylinder capacitor about the size of a stack of 10 dimes. There should be a value on it of 1 Farad at 5V or something similar. If you find it, replace it with a new one and that should resolve the problem.
Dan
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