HP LaserJet 4101mfp must, does not, does not, from the wall, Required tools, After performing service, Before performing service

Removal and replacement strategy

	This chapter documents the removal and replacement of field replaceable units (FRUs) only.
	Reinstallation is generally the reverse of removal. Occasionally, notes are included to provide
	directions for difficult or critical replacement procedures.
WARNING!		Unplug the power cord from the power outlet (at the wall receptacle) before attempting to service
		the product. If this warning is not followed, severe injury can result. Certain functional checks
		during troubleshooting must be performed with power supplied to the product. However, the power
		supply should be disconnected during removal.
		The power cord must be unplugged from the wall receptacle. Unplugging the cord from the back
		of the print unit does not prevent AC power from going to the scan unit. See “Back view” on
		page 21.
CAUTION		The product contains components that are sensitive to electrostatic discharge (ESD). Always
		perform service work at an ESD-protected workstation. If an ESD-protected workstation is not
		available, discharge body static by grasping the print engine chassis before touching an ESD
		sensitive component. Ground the print engine chassis before servicing the product.

Required tools

● #2 Phillips screwdriver with magnetic tip ● small flatblade screwdriver

● needle-nose pliers

● ESD mat (if available) ● penlight (optional)

CAUTION	A PoziDriv screwdriver will damage screw heads on the product. Use a #2 Phillips screwdriver.
Hint	To install a self-tapping screw, first turn it counterclockwise to align it with the existing thread
	pattern, then carefully turn it clockwise to tighten. Do not overtighten.

Before performing service

●If possible, print a configuration page. See “Configuration page” on page 130.

●Remove all media from the product.

●Unplug the power cord from the wall receptacle. Unplugging the cord from the back of the print unit does not prevent AC power from going to the scan unit.

●Place the product on an ESD mat, if available. If an ESD-protected workstation is not available, discharge body static and ground the print engine chassis before servicing the product.

●Remove the print cartridge. See “Checking the print cartridge” on page 137.

After performing service

●Replace the print cartridge.

●Reconnect all cables to the product.

●Replace all accessories and reload the media.

●Verify that the latest firmware is installed on the product. See “Configuration page” on page 130.

●Restore customer configuration settings.

70 Removal and replacement C9148-90909