• Code: E7-50
• Description: LSU connection trouble
  An LSU which does not conform to the machine is installed.
• Causes: PCU PWB trouble LSU trouble
• Remedy: Check LSU PWB. Check PCU PWB. Check connection of the connector and the harness between PCU and LSU.

• Code: E7-80
• Description: Communication trouble (ICU detection) between ICU and scanner
  Communication establishment error/Fleming/ Parity/Protocol error
• Causes: Defective connection of slave unit PWB connector Defective harness between slave unit PWB and Controller PWB Slave unit PWB mother board connector pin breakage
• Remedy: Check connector and harness of slave unit PWB and Controller PWB. Check grounding of machine.

• Code: E7-90
• Description: PCU communication trouble
  Communication establishment error/Fleming/ Parity/Protocol error
• Causes: Defective connection of slave unit PWB connector Defective harness between slave unit PWB and Controller PWB Slave unit PWB mother board connector pin breakage
• Remedy: Check connector and harness of slave unit PWB and Controller PWB. Check grounding of machine.

• Code: EE-EL
• Description: Auto developer adjustment trouble (Over-toner)
  The sample data is at 68 or below when auto developer adjustment is performed.
• Causes: Toner concentration sensor trouble Charging voltage, developing voltage abnormality Insufficient toner concentration Developing unit trouble PCU PWB trouble
• Remedy: Use DIAG (SIM25-2) to perform auto developer adjustment.

• Code: EE-EU
• Description: Auto developer adjustment trouble (Under-toner)
  The sample data is of 168 or above when auto developer adjustment is performed.
• Causes: Insufficient toner concentration Charging voltage, developing voltage abnormality Insufficient toner concentration Developing unit trouble PCU PWB trouble
• Remedy: Use DIAG (SIM25-2) to perform auto developer adjustment.

• Code: F1-00
• Description: Finisher (AR-FN6) communication trouble
  Communication cable test error after turning on the power or exiting from DIAG. Communication error with the finisher
• Causes: Improper connection or disconnection of connectors and harness between the machine and the finisher. Finisher control PWB trouble Control PWB (PCU) trouble Malfunction by noises
• Remedy: Canceled by turning OFF/ON the power. Check connectors and harness in the communication line. Replace the finisher control PWB or PCU PWB.

• Code: F1-00
• Description: Mail-bin stacker (AR-MS1) communication trouble
  Communication cable test error after turning on the power or exiting from DIAG. Communication error with the Mail-bin stacker.
• Causes: Improper connection or disconnection of connector and harness between the machine and the Mail-bin stacker. Mail-bin stacker control PWB trouble Control PWB (PCU) trouble Malfunction by noises
• Remedy: Canceled by turning OFF/ON the power. Check harness and connector in the communication line. Replace the Mail-bin stacker PWB or PCU PWB.

• Code: F1-02
• Description: Mail-bin stacker (AR-MS1) transport motor abnormality
  Transport motor trouble
• Causes: Motor lock Motor rpm abnormality Overcurrent to the motor Mail-bin stacker control PWB trouble
• Remedy: Use DIAG (SIM3-3) to check the motor operation