What should I do if the low voltage power supply stops outputting DC voltage?
If no DC voltage is output from the Low Voltage Power Supply Assembly, the protection function may have been activated due to overcurrent or abnormal voltage. Turn OFF the Power Switch, disconnect the AC Power Supply Cord from the inlet, fix the underlying problem, and then turn the Power Switch ON again. (Page 24)
From the official Canon LBP1238 Ii Printer manual, page 24
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