Dell 2135cn - Multifunction Color Laser Printer Troubleshooting Manual page 213

At least once a month, check whether or not the electric leakage detector is functioning by following the steps below:
1. Turn on the printer, and then press the TEST button.
If the RESET button is tripped and the printer is turned off, the electric leakage detector functions correctly. Press the RESET button to turn the
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printer back on.
If the RESET button is not tripped, contact Dell. Do not continue to use the printer if the electric leakage detector is not functioning.
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