HP 400 manual Power-on checks

General topic	Questions
Toner cartridges	●	Is each toner cartridge installed correctly?
Transfer unit and fuser	●	Are the transfer unit and fuser installed correctly?
Doors	●	Is the front door closed?
Condensation	●	Does condensation occur following a temperature change (particularly in
		winter following cold storage)? If so, wipe affected parts dry or leave the
		product on for 10 to 20 minutes.
	●	Was a toner cartridge opened soon after being moved from a cold to a warm
		room? If so, allow the toner cartridge to sit at room temperature for 1 to 2
		hours.
Miscellaneous	●	Check for and remove any non-HP components (for example, toner cartridges
		or memory modules) from the product.
	●	Check to see whether the hardware or software configuration has changed or
		the problem is not associated with any specific software.
	●	Remove the product from the network and ensure that the failure is associated
		with the product before beginning troubleshooting.
	●	For any print-quality issues, calibrate the product. See Calibrate the product
		on page 137

Power-on checks

When you turn on the product, if it does not make any sound or if the control-panel display is blank, check the following items:

●Verify that the product is plugged directly into an active electrical outlet that has the correct voltage. Do not plug the product into a surge protector or power strip.

●Verify that the power button is in the on position.

●Verify that the formatter is seated correctly.

●Remove any HP Jetdirect or other devices, and then try to turn the product on again.

●Ensure that the control-panel display is connected.

●Check the two fuses on the power supply.

●If necessary, replace the power supply.

●If necessary, replace the DC controller.

ENWW Troubleshooting process 115