Gestetner B070 Service Manual page 328

SERVICE CALL CONDITIONS
SC312: Drum Potential Sensor Error 3 (Vd Abnormal)
Definition- [D]
When Vd on the surface of the unexposed drum is adjusted during process control
initialization, -900 V is applied to the charge grid but Vd is more than -900.
NOTE: After this SC is issued, the grid voltage changes to the value set with
SP2001-001 (Charge Corona Bias Adjustment) and LD power changes to
the value set with SP2103 (LD Power Adjustment).
Possible Causes
• Drum potential sensor defective
• Poor drum potential sensor harness connection
• Drum potential sensor connector defective
• IOB defective
• Poor drum ground connection
• Drum disconnected
• Quenching lamp defective
• CBG power pack defective
• Charge corona wire dirty or defective
SC313: Drum Potential Sensor Error 4 (Vd > Vg)
Definition [D]
When adjusting the drum potential (Vd) during process control initialization, the
drum potential sensor detects that Vd is more than Vg (grid voltage).
NOTE: After this SC is issued, the grid voltage changes to the value set with
SP2001-001 (Charge Corona Bias Adjustment) and LD power changes to
the value set with SP2103 (LD Power Adjustment).
Possible Causes
• Drum potential sensor defective
• Drum potential sensor harness defective
• Drum potential sensor connector defective
• IOB defective
• Poor contact at the drum connection
• CBG power pack defective
• Charge corona wire dirty or defective
B070/B071
CÓPIA NÃO CONTROLADA
4-8
CÓPIA NÃO CONTROLADA
SM