HP LaserJet Pro CP1025 Service Manual - Page 73
Power subsystem, Power-on checks
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Power subsystem Power-on checks Turn on the power. If the control-panel LEDs do not illuminate, perform the power-on checks to find the cause of the problem. 1. Verify that the product is plugged into an active electrical outlet that delivers the correct voltage. 2. Verify that the power button is in the on position. 3. Make sure that the product makes the expected start up sounds. NOTE: The overcurrent/overvoltage protection circuit in the low-voltage power supply unit might be functioning. Turn the product off, unplug the power cord, and turn the product on. If the product does not function, the fuse melts, or the power supply is malfunctioning, replace the engine controller unit. See Engine controller assembly on page 46. ENWW Troubleshooting process 57