HP 5 C3916A, C2021A, 5n C3952A, 5m C3917A, 4 plus C2037A Printer Open Message, Printer Open Checks

12 Printer Open Message

The 12 PRINTER OPEN (or CLOSE PRINTER COVER) display tells the operator to close the printer’s top cover. The DC Controller detects the Printer Open condition through the position of SW601, which is located on the Paper Feed Assembly PCA . A tab underneath the top cover Door engages SW601 through a slot in the Top Cover Assembly.

In addition to signaling that the top cover is open, SW601 enables the +24B VDC which controls the high voltage for the printing processes, and the AC Voltage for the Fuser Assembly.

Table 7-6		12 PRINTER OPEN Checks
	Checks		Action
Is the Top Cover Assembly open?			Ensure the Top Cover Assembly is firmly
			closed, and that the protrusion that
			engages the switch actuator is not
			broken.
With the top cover open, check that the			Use a slim object to manually engage
switch actuator does engage the switch.			SW601. Listen for a definite “click” as the
			switch is engaged (see Figures 7-2 and
			7-14).
Has the Paper Control PCA on the Paper			SW601 has an actuator that can be
Feed Assembly been replaced?			deleted during reassembly. Ensure that
			this actuator is installed correctly.
Is the DC Controller PCA defective?			Measure the 24 VDC on J201, pins 8 and
			9 on the DC Controller (see Figures 7-16
			and 7-17 for locations). If this 24 volts
			toggles as SW601 is activated, replace
			the DC Controller. If it does not, replace
			the Paper Control PCA or the cable. Also
			check J201-6 (DOPEN). This voltage
			should be 5 VDC when the printer is
			open, and 0 when the printer is closed. If
			not, replace the DC Controller PCA.

7-18 Troubleshooting