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If your GM-70 or GR-700 will not remember programs, or always powers up with facotry defaults, chances are that you need a new battery as well. Like almost every programmable device made, the MC1 (and GM-70, GR-700, Z3, etc). all use a tiny lithium battery to store settings when the unit is switched off. These lithium batteries, roughly the same size and shape of a quarter, are usually rated for 3 volts and are expected to last five years. However, some batteries have worked for as long as ten years or more before failure.
If you are lucky, the lithium battery will be in a grey plastic socket. This battery will side and slip out of its socket. By far, the most common battery is the CR2032, found in about 95 percent of devices. Other units, like the GM-70 or MC1, use a tabbed battery, or a battery with conducting legs attached to the battery. This means the old battery will have to be de-soldered to remove it from the unit. CAUTION: If you are faced with the soldering type, be sure to wear a wrist strap to prevent static discharge from causing permanent damage to the RAM chips.
All these batteries are available at any full-line electronics supplier, like Mouser Electronics, my personal favorite.
Here are the photos of the battery repair on various units:
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