Gestetner A294, Service Manual

Page: 464 / 600

SERVICE CALL CONDITIONS Rev. 9/2001
A294/A295 7-6 SM
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
D
for the unexposed drum during process control initial
setting, –1,000 V is applied to the charge grid, but the drum potential sensor
detects that V
D
is more than –970 V.
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
D
) during process control initial setting,
the drum potential sensor detects that V
D
is more than V
G
(grid voltage).
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
CÓPIA NÃO CONTROLADA
CÓPIA NÃO CONTROLADA