Trouble-
shooting
SERVICE CALL
SM 4-3 G071
No.
Definition
Symptom Possible Cause
Charge corona unit electrical leak 300 D
The charge corona unit keeps outputting; the unit is
operating at the minimum PWM duty value. → 4.5 Volt
(or more) is returning for 60 milliseconds.
• Short circuit in the
charge corona unit
• Defective high
voltage supply board
• Defective harness
(BCU - high voltage
supply board)
Charge corona unit disconnection 301 D
The charge corona unit keeps outputting. → The unit is
operating at the maximum PWM duty value for 60
milliseconds.
• Defective PCU
installation
• Defective high
voltage supply board
• Defective harness
(BCU - high voltage
supply board)
Charge grid electrical leak 302 D
The charge grid keeps outputting. → The returning
voltage exceeds the target by 0.5 Volt or more for 120
milliseconds.
• Short circuit in the
charge grid
• Defective high
voltage supply board
• Defective harness
(BCU - high voltage
supply board)
Charge corona unit cleaner error 305 D
• Cleaning starts. → The lock signal is not detected
within 30 seconds.
• Cleaning starts. → The cleaner turns. → The lock
signal is detected within 6 seconds.
• The lock signal is detected while the unit is moving
away from the HP. → The next lock signal is detected
within 6 seconds after the unit has turned toward the
HP.
• Defective cleaner
Development error 1 (K/Y) 350 D
A development process starts. → The returning voltage
exceeds the target by 0.5 Volt or more for 60
milliseconds.
• Short circuit in the
development unit
• Defective high
voltage supply board
• Defective harness
(BCU - high voltage
supply board)
Development error 2 (C/M) 351 D
A development process starts. → The returning voltage
exceeds the target by 0.5 Volt or more for 60
milliseconds.
• Short circuit in the
development unit
• Defective high
voltage supply board
• Defective harness
(BCU - high voltage
supply board)
Development motor error 352 D
• The development motor starts or changes speed. →
The motor does not detect a 1-second lock signal
within 3 seconds.
• The development motor starts. → The lock signal is
detected during normal operation. → The lock signal
is interrupted for 1 second or more.
• Defective
development motor
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