TAG 808: Prints Overtoned/Dark Vertical Streaks
June 1999 Troubleshooting Analysis Guide (TAGs) 3-173
10
Reinstall the developer unit.
• Run test prints.
• Check TP3-31 for a voltage change from +12 Vdc to 0Vdc while running test prints.
Does the voltage change from +12 Vdc to 0Vdc every other print cycle?
No: Go to #14 in this TAG.
Yes: Continue.
11
Turn the printer off and unplug the power cord.
• Disconnect J/P41.
• Remove the developer unit.
• Check for continuity:
P4 P41-44 to P25-2,
P41-47 to P25-3, and
P41-50 to P25-1.
Is there continuity at each?
No: Repair or replace the connectors or wiring from:
P41-44 to P25-2,
P41-47 to P25-3, or
P41-50 to P25-1;
then turn to TAG 002: Check & Problem Resolution.
Yes: Continue.
12
Verify that the connector is securely plugged into the toner patch sensor circuit board, which is
mounted on the developer unit.
Is it connected properly?
No: Reconnect the connector, then turn to TAG 002: Check & Problem Resolution.
Yes: Continue.
13
Clean the printhead lens and toner patch sensor.
• Reinstall the developer unit.
• Reconnect J/P41.
• Run test prints while checking TP3-31 for a voltage change.
Does the voltage still change from +12 Vdc to 0 Vdc every other print cycle?
No: Contamination was at fault. Turn to TAG 002: Check & Problem Resolution.
Yes: Replace the developer unit and cleaner unit, then turn to TAG 002: Check & Problem
Resolution.
14
Turn the printer off and unplug the power cord.
• Disconnect J/P41 and J/P24.
• Check P41-30 for continuity to ground.
Is there continuity?
No: Continue.
Yes: Repair or replace the connectors or wiring from P41-30 to P24-2, then turn to TAG 002:
Check & Problem Resolution.
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