Savin 4027 Service Manual Page 224

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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
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA
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