HP P2050 manual Service error, Device error, Press OK Door open, Genuine HP supply installed

Control-panel message	Event code	Description	Recommended action
79 Service error	79.0000	An incompatible DIMM is	1. Turn the product power off.
Turn off then on	79.0001	installed.	2. Install a DIMM that the
				product supports. See Parts
				and diagrams on page 253
				for a list of supported
				DIMMs. See Install memory
				(HP LaserJet P2050 Series
				Printers only) on page 64 for
				DIMM installation
				instructions.
			3.	Turn the product on.
Device error		An internal error occurred.	Press OK to resume the job.
Press [OK]
Door open		Opening the cartridge door	1. Remove the left cover, and
		opens the cartridge door switch		then open and close the
		(SW301) and disables the +24 V		cartridge door. Determine if
		to the high-voltage contacts on		SW301 closes when the
		the print cartridges.		door closes.
			2.	Make sure that the two
				connectors from the engine
				control PCA to the switch
				are securely installed on the
				switch contacts.
			3.	Replace SW301 if the
				message persists.
Genuine HP supply installed		A genuine HP supply was	No action necessary.
		installed. This message appears
		briefly after the supply is installed

and then is replaced by the message Ready.

Install black cartridge	The product checks for the
	presence of a print cartridge at
	start up and anytime the top
	cover is closed. At start up or
	when the top cover is closed, a
	high-voltage bias is placed on the
	print cartridge's developer roller.
	This message appears if the print
	cartridge's antenna is unable to
	detect the high-voltage bias.

1.Make sure that the sealing tape on the print cartridge has been removed.

2.Verify that the print cartridge is correctly installed.

3.Inspect the high-voltage contact on the print cartridge and in the print- cartridge cavity to make sure that they are not damaged.

4.If the messages persists, install another HP print cartridge.

5.Make sure that the engine controller PCA is correctly installed.

222 Chapter 7 Solve problems ENWW