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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#TechHumayunkabir, photocopier printer fax machine repair electronics technician. Machine brand name: Canon, Sharp, kyocera, Toshiba, e-studio, konica minolta, bizhub, Ricoh, Hp, Develop, Bother, error, code, errors, codes, panasonic.

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Great Sir🤝✌️👏🏼😊🌷

[@adachenoah8422]

Thanks

[@mohamedalhfiney3208]

Cood l4-30

[@TechHumayunkabir]

MFP fan motor trouble.
Fan motor trouble. MFP PWB trouble.Harness and connector connection trouble. PCU PWB trouble

[@mohamedalhfiney3208]

@@TechHumayunkabir Please send a picture of the piece referred to in the holidays .. Thank you very much ..

[@thongchaisrivilai8656]

Sharp code L4-34

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Replace the LSU cooling fan. Replace the PCU PWB.

[@abderazagbouchmel7704]

Sharp 7024 error code l4 70

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Toner motor faulty

[@AhmedAli-xs4wk]

C1-01SHARP754

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Charger cleaner trouble