Printronix P7000 Series Maintenance Manual page 190

Chapter 3
Troubleshooting Other Symptoms
Symptom
Control panel keys do not
work
Control panel display shows
garbled, broken characters
190
Table 6. General Symptom List
1. Power on the printer. Check the operation of the control
panel keys. Replace the control panel assembly if the keys
do not work.
2. Power on the printer. Check the operation of the control
panel keys. Replace the control panel cable assembly if
the keys do not work.
3. Power on the printer. Check the operation of the control
panel keys. Replace the controller board if the keys do not
work.
1. Remove the paper path or pedestal top cover. Check
cable connections into the controller board. Make sure the
control panel cable is seated in connector J110 on the
controller board.
2. Make sure the SDRAM DIMM is seated properly in its slot
on the controller board. Reseat and re-latch the SDRAM
DIMM.
3. Power on the printer. Inspect the control panel display. If
the control panel shows broken characters, replace the
SDRAM.
Solution