Sc300: Image Development System (1) - Ricoh MT-C1 Service Manual

B140/B246 SERIES SERVICE MODE

SC300: Image Development System (1)

SC No.
300 D Charge corona output error
The feedback voltage from the
charge corona unit is detected too
high 9 times.
303 C Charge corona grid leak
When the high voltage is output to
the corona grid, feedback voltage
exceeds the prescribed value 9
times.
304 D Charge grid circuit open
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.
305 D Charge corona wire cleaner error 1
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.
306 C Charge corona wire cleaner error 2
Charge coronal motor is
disconnected. (The current at the
charge corona motor is detected
less than 83 mA.)
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.
310 D Potential sensor calibration error 1
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.
Symptom
Symptom
4-44
Possible Cause
• Charge corona power pack defective
• Charge corona harness disconnected
• Poor charge corona unit connection
• Charge corona power pack defective
• Charge corona harness disconnected
• Poor charge corona unit connection
• Charge corona unit defective or
disconnected
• Charge corona harness defective
• Charge corona power pack is defective.
• Charge corona wire cleaner motor
defective
• Motor driver defective
• Charge corona wire cleaner motor
connector is defective, connected.
Possible Cause
• Potential sensor defective
• Potential sensor harness
disconnected
• Potential sensor connector defective
or disconnected
• IOB defective
• OPC connector defective
• Development power pack defective
15 February 2006