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Joined: Aug 2005
Another possiblity is a shorted transsitor in the H-bridge driver circuit for the printer motor. When the other transistor in that side of the bridge is turned on (to run the motor for either the printing command or the ADV button), then the circuit effectively shorts out the power line.
Needless to say if this is the problem, then the ADV button won't work either. I have seen this once, not in a 97, but in another Topcat that I repaired for somebody. A rather rarer machine than the 97, too...