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