Description: Developing cartridge not installed. The developing cartridge is not installed. Communication with the CRUM cannot be made in initial check of the CRUM.
Causes: Developing unit disconnection MCU PWB abnormality CRUM chip abnormality
Remedy: Check installation of the developing unit. Replace the MCU PWB.
Code: CH-ON
Description: Side door open
Causes: Side door sensor abnormality MCU PWB abnormality
Remedy: Check that all the side doors are closed. Replace the MCU PWB.
Code: E7-02
Description: LSU trouble
Causes: The BD signal from the LSU cannot be detected in a certain cycle. (Always OFF or always ON) - LSU connector or LSU harness defect or disconnection - Polygon motor rotation abnormality - Laser beams are not generated. - MCU PWB abnormality
Remedy: Check connection of the LSU connector. Execute SIM 61-03 to check the LSU operations. Check that the polygon motor rotates normally. Check that the laser emitting diode generates laser beams. Replace the LSU unit. Replace the MCU PWB.
Code: E7-10
Description: Shading trouble (Black correction) The CCD black scan level is abnormal when the shading.
Causes: Improper connection of the CCD unit flat cable CCD unit abnormality MCU PWB abnormality.
Remedy: Check connection of the CCD unit flat cable. Check the CCD unit
Code: E7-11
Description: Shading trouble (White correction) The CCD white scan level is abnormal when the shading.
Causes: 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 ADF scan position.) Improper installation of the mirror unit
Remedy: Clean the mirror, lens, and the reference white plate. Check the light quantity and lighting status of the copy lamp (SIM 05-03). Check the MCU PWB.
Code: E7-12
Description: Shading trouble White correction is not completed in the specified number of operations.
Causes: CCD unit flat cable connection failure. Dirt on mirrors, lenses, and the reference white plate. Copy lamp lighting abnormality CCD unit abnormality MCU PWB abnormality
Remedy: Clean mirrors, lenses, and the reference white plate. Check the copy lamp light quantity (SIM 05-03) and lighting. Check the CCD unit. Check the MCU PWB.