How to solve error code L4 31 on sharp machine contents AR 5618 5620 5623

Error code: L4 31

Fusing fan lock detection. The fusing fan does not rotate. Sampling is performed in 50msec interval,and the normal signal cannot be detected 5 times continuously in 1sec.
Fan trouble or harness contact trouble and disconnection Use SIM05-02 to check the operations of the fusing fan motor. Heck connection of the fan harness and the connector. Replace the fan. Replace the MCU PWB.
Code: CH BlinkDescription:Developing cartridge not installed. The developing cartridge is not installed. Communication with the CRUM cannot be made in initial check of the CRUM. Developing unit disconnection MCU PWB abnormality CRUM chip abnormality.
Check installation of the developing unit. Replace the MCU PWB.
Code: CH ON
Side door open. The side door is open.Causes:Side door sensor abnormality MCU PWB abnormalityRemedy:Check that all the side doors are closed. Replace the MCU PWB.
Code: E7 01Description: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.
1. The memory capacity on the MCU PWB is wrong. 2. Setting for a single surface model is wrong.
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.

All codes

CH Blink

CH ON

E7 01

E7 02

E7 06

E7 10

E7 11

E7 16

F2 40

F2 64

F2 70

F2 74

H3 00

H3 01

H4 00

H5 01

L1 00

L3 00

L4 01

L4 31

L4 32

L6 10

U2 04

U2 11

U2 12

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