General Symptom List180Operator PanelBlack squares on operator paneldisplay1. Power off and unplug the printer. Remove the paper guide assembly or pedestal top cover.Disconnect the operator panel cable from the panel and from J110 on the controller board. Checkcontinuity of the cable. Replace the operator panel cable if it fails continuity test. Connect the cable.2. If the printer has the coax/twinax expansion board, check the adapter connection to the controllerboard. Make sure the 60-pin expansion adapter is correctly seated in the controller board connectorJ111 and the coax/twinax expansion board.3. Make sure the flash memory is seated properly in J10 and J11. Regardless of memoryconfiguration, J11 must be used. Reseat flash memory.4. Plug in the printer and power it on. If black squares appear on the LCD, the flash memory could beblank. Replace the flash SIMM in J11 with a new flash SIMM and reload code (page 231).5. Make sure the controller board has a security key installed.6. Check the shuttle for electrical shorts (page 252).7. Plug in the printer and power it on. If black squares appear on the LCD, replace the operator panel.8. Plug in the printer and power it on. If black squares appear on the LCD, replace the controller board(page 319). After replacing the controller board, do NOT make the printer READY, but proceedimmediately to the next step.9. Download and install the latest code from IBM First (page 231).10. Power on the printer in download mode and load flash memory (page 238).11. If you encounter the failure after replacing the controller board, reinstall the original controller boardand contact your DDS and Second Level Support.Table 5. General Symptom ListSymptom Corrective Action
