1.3 DIRTY BACKGROUND
- Problem -
1. Dirty background at image density level 4 (manual setting).
2. Copies made in ADS mode have a dirty background.
- Possible Causes -
1. V
L
correction failure
•
Very dirty optics (V
L
correction cannot compensate)
•
Deteriorated exposure lamp (maximum output cannot give sufficient
light intensity)
•
Failure of the dc power supply board
•
Dirty erase lamp unit
2. V
R
correction failure
•
CB (development bias) high voltage supply board failure
•
Poor development bias terminal contact
•
The development bias is grounded
3. The OPC drum is not grounded properly
4. ADS mode
•
Improper ADS Density setting (SP5-106)
•
ADS Sensor board failure
•
CB high voltage supply board failure
•
Incorrect adjustment of the ADS sensor (SP4-201)
•
Sensitivity of the ADS sensor is not correct for the original
5. High toner density
•
Improper setting of the drum charge voltage adjustment (SP2-001)
•
Improper V
SP
pattern bias (SP2-203)
•
Dirty erase lamp unit
6. Drum charge roller thermister error
•
Connector of the drum charge roller thermistor id not connected
properly.
•
Broken drum charge roller thermistor
Troubleshooting
FSM 6-5 A156/A160/A162
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