Gestetner B070 Service Manual page 329

SC314: Drum Potential Sensor Error 5 (Vh Abnormal)
Definition [D]
When adjusting the drum potential (Vh) for LD power adjustment during process
control initial setting, the first time the Vh pattern is made, the drum potential
sensor detects that Vh is more than 600 V.
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 worn
• Drum potential sensor defective
• Poor drum potential sensor connection
• Drum potential sensor connector defective
• LD unit requires cleaning
• IOB defective
• Drum unit connector defective
• LDB board defective
SC315: Drum Potential Sensor Error 6 (Vd Abnormal)
Definition [D]
When adjusting Vd for the unexposed drum during process control initialization, Vd
does not reach the voltage set for SP2001 007 ± 20 V even if Vg has been
adjusted 5 times.
SP2001 007 (Charge Corona Bias Adjustment – Vd) adjusts the target Vd voltage
for process control. Range/Default/Step: [700~1000 / 800 / 5 V].
NOTE: If the Vd adjustment fails, the machine uses the charge grid voltage Vg for
the previous adjustment. In this condition, normal ID sensor pattern
detection is done.
Possible Causes
• Drum potential sensor defective
• Drum potential sensor harness defective
• Drum potential sensor connector defective
• IOB defective
• Drum unit connector defective
• CBG power pack defective
SM
CÓPIA NÃO CONTROLADA
4-9
CÓPIA NÃO CONTROLADA
SERVICE CALL CONDITIONS
B070/B071