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Mend GBC 4250 Power Switch Works

GBC 4250 Laminator won't heat?

The power is good. The lid cutoff switch works. The Thermal cutoff is on (not cutoff). The heat sensor reads 40 H ohms. The motor runs (forward and reverse). I jumpered the heat sensor. Still the heater will not come on. I have 120V on both sides of the heaters. The heaters, in series, read 9 ohms.
I saw an entry about a transistor. Which chip on the PCB would cause the heater to not come on?

Mike Schilling
August 2012

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