Gestetner A294 Service Manual page 464

SERVICE CALL CONDITIONS
SC311: Drum Potential Sensor Error 2
Definition [D]
When calibrating the drum potential sensor during process control initial
setting, the rate of change of drum potential sensor output with voltage on the
drum is out of specification.
Possible Causes
• Drum potential sensor defective
• Poor connection between the drum potential sensor and the BCU
• BCU defective
• Charge/bias/grid power pack defective
SC312: Drum Potential Sensor Error 3
Definition- [D]
When adjusting V
setting, –1,000 V is applied to the charge grid, but the drum potential sensor
detects that V
D
Possible Causes
• Drum potential sensor defective
• Poor connection between the drum unit and the BCU
• Charge/bias/grid power pack defective
• Dirty or worn charge corona wire
SC313: Drum Potential Sensor Error 4
Definition [D]
When adjusting the drum potential (V
the drum potential sensor detects that V
Possible Causes
• Drum potential sensor defective
• Poor connection between the drum potential sensor and the BCU
• BCU defective
• Charge/bias/grid power pack defective
• Dirty or worn charge corona wire
A294/A295
CÓPIA NÃO CONTROLADA
for the unexposed drum during process control initial
D
is more than –970 V.
CÓPIA NÃO CONTROLADA
) during process control initial setting,
D
is more than V
D
7-6
Rev. 9/2001
(grid voltage).
G
SM