AR-6020V TROUBLESHOOTING 7 – 5
L4-40 Ozone exhaust fan lock detection
L4-70 Toner motor lock detection
L6-10 Polygon motor trouble
U2-04 EEPROM read/write error (serial
communication error)
U2-11 Counter check sum error (EEPROM)
U2-12 Adjustment value check sum error
(EEPROM)
CH-ON Side door open
CH-Blink Developing cartridge not installed
Detail MCU
Cause Ozone exhaust fan.
MCU PWB trouble.
Connection trouble of the connector and the harness.
Check & Remedy Check connection of the fan harness and the
connector.
Replace the fan.
Replace the MCU PWB.
Detail MCU
Cause Toner motor abnormality
Improper connection or disconnection of the toner
motor and the harness.
MCU PWB abnormality
Check & Remedy Use SIM 61-3 to check the toner motor operations.
Check connection of the toner motor harness/
connector.
Replace the toner motor..
Replace the MCU PWB.
Detail MCU
Cause Polygon motor unit abnormality
Improper connection or disconnection of the polygon
motor and the harness.
MCU PWB abnormality
Check & Remedy Use SIM 61-1 to check the polygon motor operations.
Check connection of the polygon motor harness/
connector.
Replace the LSU.
Replace the MCU PWB.
Detail MCU
Cause EEPROM abnormality
Check & Remedy Check that the EEPROM is properly set.
Use SIM 16 to cancel the trouble.
Replace the MCU PWB.
Detail MCU
Cause EEPROM abnormality
Check & Remedy Check that the EEPROM is properly set.
Use SIM 16 to cancel the trouble.
Replace the MCU PWB.
Detail MCU
Cause EEPROM abnormality
Check & Remedy Check that the EEPROM is properly set.
Use SIM 16 to cancel the trouble.
Replace the MCU PWB.
Detail MCU
Cause Side door sensor abnormality
MCU PWB abnormality
Check & Remedy Check that all the side doors are closed.
Replace the MCU PWB.
Detail MCU
Cause Developing unit disconnection
MCU PWB abnormality
Toner cartridge is not installed.
Check & Remedy Check installation of the developing unit.
Replace the MCU PWB.
Install toner cartridge.
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