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: The side door is open.
Causes: Side door sensor abnormality MCU PWB abnormality
Remedy: Check that all the side doors are closed. Replace the MCU PWB.
Code: E7 01
Description: Duplex model memory error/ Image data error. 1. The memory capacity for the duplex model machine is wrong. Insufficient memory capacity. 2. Duplex setting is set for a single surface model.
Causes: 1. The memory capacity on the MCU PWB is wrong. 2. Setting for a single surface model is wrong.
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.
Code: E7 02
Description: LSU trouble. The BD signal from the LSU cannot be detected in a certain cycle. (Always OFF or always ON)
Causes: 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 06
Description: Image data decode error. Image expansion error
Causes: MCU PWB abnormality USB cable trouble
Remedy: Replace the MCU PWB. Replace the USB cable.
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.