Sharp AR-6020V Service Manual page 69

2. Details of error codes and countermeasures
E7-01 Duplex model memory error/ Image
data error
Detail MCU
Cause 1. The memory capacity on the MCU PWB is wrong.
2. Setting for a single surface model is wrong.
Check & Remedy 1. Use SIM26-39 to check to confirm that the memory
capacity is 64MB. If it is not 64MB, replace the MCU
PWB.
2. If SIM26-04 is set to 1, change the setting to 0. If it
is 0, replace the MCU PWB.
E7-06 Image data decode error
Detail MCU
Cause MCU PWB abnormality
USB cable trouble
Check & Remedy Replace the MCU PWB.
Replace the USB cable.
E7-10 Shading error (Black correction)
Detail MCU
Cause Improper connection of the CCD unit flat cable
CCD unit abnormality
MCU PWB abnormality.
Check & Remedy Check connection of the CCD unit flat cable.
Check the CCD unit.
E7-11 Shading error (White correction)
Detail MCU
Cause Improper connection of the CCD unit flat cable
Dirt on the mirror, the lens, and the reference white
plate
Copy lamp lighting abnormality
CCD unit abnormality
MCU PWB abnormality
(When occurred in the SPF scan position.)
Improper installation of the mirror unit
Check & Remedy Clean the mirror, the lens, and the reference white
plate.
Check lighting and the light quantity of the copy lamp
(SIM05-03).
Check the CCD unit.
Check the MCU PWB.
E7-20 LSU laser detection error
Detail MCU
Cause Laser optical axis misalignment
Reduced laser power, lighting error, laser diode
trouble.
Disconnection or improper connection of harness and
connector between LD PWB and MCU PWB.
Check & Remedy Use SIM61-1 to check the operation of the LSU.
Check connection of the connector and harness
between the LD PWB and the MCU PWB.
Replace the MCU PWB.
Replace the LSU.
EL-
Check & Remedy
EU-
Check & Remedy
F2-39
Check & Remedy
F2-40
Check & Remedy
F2-64
Check & Remedy
AR-6020V TROUBLESHOOTING 7 – 2
Auto developer adjustment trouble
(Over-toner abnormality)
Detail PCU
Cause Toner density sensor trouble, charging voltage/
developing voltage error, toner concentration trouble,
developing unit trouble, MCU PWB trouble.
Use SIM25-2 to perform the auto developer
adjustment.
Auto developer adjustment trouble
(Under-toner abnormality)
Detail PCU
Cause Toner density sensor trouble, charging voltage/
developing voltage error, toner concentration trouble,
developing unit trouble, MCU PWB trouble.
Use SIM25-2 to perform the auto developer
adjustment.
Temperature sensor trouble
Detail PCU
Cause Process thermistor trouble.
Process thermistor harness connection trouble.
MCU PWB trouble.
Replace the process thermistor.
Check connection of the process thermistor harness
and the connector.
Replace the MCU PWB.
ATC sensor trouble
Detail MCU
Cause Toner density sensor output abnormality.
Sensor connector and harness connection trouble.
Developing unit trouble.
MCU PWB trouble.
Replace the toner density sensor.
Check connection of the sensor connector and the
harness.
Replace the developing unit.
Replace the MCU PWB.
Toner supply operation trouble
Detail MCU
Cause Toner motor trouble.
Toner density sensor trouble.
Connector/harness trouble.
MCU PWB trouble.
Toner cartridge trouble.
Developing unit trouble.
Toner transport pipe section trouble
Replace the toner motor.
Replace the toner density sensor.
Connector and harness check.
Replace the MCU PWB.
Replace the toner cartridge.
Replace the developing unit.
Check the toner transport pipe section.