B140 SERIES AND G126 SERVICE MODE
SM 4-41 B064 Series/B140 Series/G126
Trouble-
shooting
SC300: Image Development System (1)
SC No. Symptom Possible Cause
Charge corona output error 300 D
The feedback voltage from the
charge corona unit is detected too
high 9 times.
• Charge corona power pack defective
• Charge corona harness disconnected
• Poor charge corona unit connection
Charge corona grid leak 303 D
When the high voltage is output to
the corona grid, feedback voltage
exceeds the prescribed value 9
times.
• Charge corona power pack defective
• Charge corona harness disconnected
• Poor charge corona unit connection
Charge corona grid leak 303 C
When the high voltage is output to
the corona grid, feedback voltage
exceeds the prescribed value 9
times.
• Charge corona power pack defective
• Charge corona harness disconnected
• Poor charge corona unit connection
Charge grid circuit open 304 D
When high voltage goes to the
corona grid, feedback voltage is
more than the set value 9 times.
This feedback voltage is used to
update PWM for output control.
• Charge corona unit defective or
disconnected
• Charge corona harness defective
• Charge corona power pack is defective.
Charge corona wire cleaner error 1 305 D
The charge cleaner pad does not
arrive at the home position:
• Motor locked within 4 s after
switching on, or does not lock
within 30 s.
• Motor locked within 10 s after
reversing, or does not lock within
30 s.
• Charge corona wire cleaner motor
defective
• Motor driver defective
Charge corona wire cleaner error 2 306 C
Charge coronal motor is
disconnected. (The current at the
charge corona motor is detected
less than 83 mA.)
• Charge corona wire cleaner motor
connector is defective, connected.
NOTE: When SC310~SC317 are logged, the machine halts without displaying the SC
number. These SC codes log an abnormal condition at the potential sensor only
when SP3901 (Auto Process Control) is set to on.
SC No. Symptom Possible Cause
Potential sensor calibration error 1 310 D
During drum potential sensor
calibration, the drum potential
sensor output voltage does not
meet specification when test
voltages (–100V, –800V) are
applied to the drum.
• Potential sensor defective
• Potential sensor harness disconnected
• Potential sensor connector defective or
disconnected
• IOB defective
• OPC connector defective
• Development power pack defective
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