HP Pro 4300 C9H70UT C9H70UT#ABA manual Formatter assembly on

Table 42. Numerical printer messages (continued)

Message	Description	Action
55.X	The DC controller is not	1.	Press the SELECT ( ) button
PRINTER ERROR	communicating with the formatter.		to continue.
For help press	The problem could be caused by	2.	Turn the printer off and then
	a timing error or an intermittent		on.
alternates with	connection.	3.	Reseat the connectors
			between the
55.X			DC controller PCA and the
PRINTER ERROR			formatter.
To continue press		4.	If the problem persists,
			replace the
			DC controller PCA. See
			“DC controller PCA” on
			page 181.
		5.	Replace the formatter. See
			“Formatter assembly” on
			page 161.
56.1	Unknown input device installed.	1.	Turn the power off and then
PRINTER ERROR			on.
To continue turn off then on		2.	Reinstall all paper input trays.
		3.	Remove all non-HP
			paper-handling devices.
56.2	Unknown output device installed.	1.	Turn the power off and then
PRINTER ERROR			on.
To continue turn off then on		2.	Reinstall the stacker or
			stapler/stacker.
		3.	Remove all non-HP
			paper-handling devices.

286 Troubleshooting Q2431-90912