HP Pro 4300 C9H70UT C9H70UT#ABA manual Critical hardware error has Turn the printer off and then

Table 42. Numerical printer messages (continued)

Message	Description	Action
79.XXXX	A critical hardware error has	1.	Turn the printer off and then
PRINTER ERROR	occurred.		on.
To continue turn off then on		2.	If the problem persists, reseat
			the firmware DIMM.
		3.	Reseat the formatter.
		4.	Go to htpp://www.hp.com/
			support/LJ4200 or htpp://
			www.hp.com/support/
			LJ4300. Select Download
			Drivers and Software. Check
			for the latest firmware image
			version at the bottom of the
			page. If this firmware image
			is newer than the one
			installed on your printer and
			your printer can receive a
			firmware update, download
			the newer firmware upgrade.
			Not all HP LaseJet 4200/
			4300 printers can receive
			firmware upgrades.
		5.	Replace the formatter. See
			“Formatter assembly” on
			page 161.
		6.	Replace the firmware DIMM.
			See “Firmware DIMM” on
			page 160.
8X.YYYY	The EIO accessory card in slot X	1.	Turn the printer off and then
EIO ERROR	has encountered a critical error.		on.
		2.	If the problem persists, reseat
			the EIO card.
		3.	Replace the EIO card.
		4.	Replace the formatter
			assembly. See “Formatter
			assembly” on page 161.

294 Troubleshooting Q2431-90912