Printronix P7000 Series Maintenance Manual page 189

Symptom
Control Panel
Black squares on control
panel
Control panel blank
Table 6. General Symptom List
1. Power off the printer. Remove the paper path or pedestal
top cover. Disconnect the control panel cable from the
panel and from J110 on the controller board. Check
continuity of the cable. (See Appendix A.) Replace the
control panel cable if it fails continuity test. Connect the
cable. Power on the printer. If the symptom appears,
replace the control panel.
2. If the printer has the CT board, make sure it is correctly
seated in the controller board.
3. Power off the printer. Make sure the flash memory is
seated properly in J10 and J11 on the controller board.
Regardless of memory configuration, J10 must be used.
4. Power on the printer. If black squares appear on the LCD,
the flash memory could be blank. Replace the flash SIMM
in J10 with a new flash SIMM with the boot program
installed.
5. Power on the printer. If the symptom appears, replace the
control panel.
6. Power on the printer. If black squares appear on the LCD,
replace the controller board. Record the message and
return it with the defective board. If the LCD displays
characters correctly, download the emulation software
again (page 247).
1. Power off the printer. Remove the paper path or pedestal
top cover. Check all cable connections into the controller
board; make sure the control panel cable is seated in
connector J110 on the controller board.
2. If the printer has the CT board, make sure it is correctly
seated in the controller board.
3. Power on the printer. Inspect the control panel display and
cooling fans. If the control panel is blank and the cooling
fans come on, replace the control panel cable assembly
and/or the control panel, as required.
4. Power on the printer. If the control panel is blank and the
fans do not come on, replace the controller board.
General Symptom List
Solution
189