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CHAPTER 4
8) Poor contact in toner cartridge motor drive connector
Reconnect the connectors between the toner cartridge motor, developing PCB, and DC con-
troller PCB correctly.
9) Defective toner cartridge motor
Action: Replace the toner cartridge motor.
10) Defective developing PCB
Action: Replace the developing PCB.
11) Defective DC controller PCB
Action: Replace the DC controller PCB.
[ 6-16 ] "SERVICE CALL NOTE # F1" Waste toner sensor malfunction
<Possible causes>
1) Waste toner detection window of the drum cartridge is dirty
Action: Take out the drum cartridge from the printer and clean the waste toner detection
window with dry-cloth.
2) Dirty waste toner sensor unit
Action: Clean the waste toner sensor unit in the printer with dry-cloth.
3) Defective light guide
Action: Clean the light guide with dry-cloth if dirty. Replace the guide if scarred or frac-
tured.
4) Poor contact in waste toner sensor unit connector
Action: Reconnect the connectors between the waste toner sensor unit and DC control PCB
correctly.
5) Defective waste toner sensor unit
Action: Replace the waste toner sensor unit.
6) Damaged waste toner stirrer drive gears
Action: Check the waste toner stirrer drive gears. Replace any damaged or worn parts.
7) Defective DC controller PCB
Action: Replace the DC controller PCB.
[ 6-17 ] "SERVICE CALL NOTE # G1" Density sensor malfunction
<Possible causes>
1) Poor contact in density sensor connector
Action: Reconnect the connectors between the density sensor and DC controller PCB cor-
rectly.
2) Defective density sensor
Action: Replace the density sensor.
3) Defective DC controller PCB
Action: Replace the DC controller PCB.
4 - 44
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Troubleshooting
