TAG 800: Prints Blank or With Dark Horizontal Bands
June 1999 Troubleshooting Analysis Guide (TAGs) 3-149
10
Run diagnostic test 111.
• Watch the printhead LEDs while the test is running.
Do the LEDs illuminate?
No: Go to #18 in this TAG.
Yes: Continue.
11
Are the prints blank without dark bands?
No: Go to #15 in this TAG.
Yes: Continue.
12
Remove the photoconductor unit and place it in its protective packaging.
• Remove the developer unit.
• Inspect the drive coupling on the developer unit for damage.
Is the coupling damaged?
No: Continue.
Yes: Replace the developer unit, then turn to TAG 002: Check & Problem Resolution.
13
Rotate the drive coupling on the developer unit clockwise.
• Watch the magnetic brush.
Does the magnetic brush turn?
No: Replace the developer unit, then turn to TAG 002: Check & Problem Resolution.
Yes: Continue.
14
Reinstall the photoconductor unit.
• Run diagnostic test 009.
• Watch the developer drive coupling at the rear of the developer unit cavity.
Does the developer drive coupling turn?
No: Repair or replace the main drive gear assembly, then turn to TAG 002: Check & Problem
Resolution.
Yes: Replace the high voltage unit, then turn to TAG 002: Check & Problem Resolution.
15
Do the prints have one or more horizontal dark bands?
No: The problem has not been identified. Go back to TAG 001: Troubleshooting a Problem
and begin again.
Yes: Continue.
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