4–3Diagnostics and Troubleshooting

On–Line Diagnostics

When on line, the printer continues to sense and report problems or conditions as
they arise. Two categories of on–line error conditions exist: critical and
non–critical.
The following critical errors stop the operation of the printer:
•Engine Sensor Checks – Scans engine status sensors including paper out,
fuser temperature, toner level, cover interlocks, paper jam switches, and
fuser cam motor
•Video Interface Error – Consists of interface protocol failures
•Optical System Errors – Includes beam detect, laser power, and mirror
motor
•Toner Out
•Missing Components – Includes OPC drum unit and waste toner
container
Non–critical errors allow the printer to continue to operate, but the LCD displays
the conditions that exist. The following are non–critical errors:
•OPC Drum life exceeded
•EEPROM life exceeded
•Engine life exceeded
Running the Printer Test
This test checks both printer operation and the quality of printed output. If an
unexpected error code is displayed, refer to “Error Messages” on page 4–5.
Following the procedure for the diagnostics menu test print, starting on page
3–22, will produce a test print of the desired pattern. The test pattern and number
of pages can be selected from this menu.