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MX-C300P, MX-C300PE, MX-C300PL. Service Manual (Revised May 2016). - Sharp Copying Equipment Service Manual (repair manual). Page 113

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MX-C300P  TROUBLESHOOTING  7 – 8
F2-70
Improper toner cartridge detection 
(K)
F2-71
Improper toner cartridge detection 
(C)
F2-72
Improper toner cartridge detection 
(M)
F2-73
Improper toner cartridge detection 
(Y)
F2-74
Toner cartridge CRUM error (K)
F2-75
Toner cartridge CRUM error (C)
F2-76
Toner cartridge CRUM error (M)
F2-77
Toner cartridge CRUM error (Y)
F2-78
Image density sensor for the registra-
tion trouble (transfer belt reflection
rate trouble)
F3-22
Paper feed tray 2 lift operation trouble
H2-00
Thermister open trouble
 (TH_UM_AD2)
Cause
An improper toner cartridge is inserted. (The main 
unit detects a toner cartridge of a different 
specification.)
Toner cartridge trouble.
MFPC PWB trouble
Check & Remedy
Replace the toner cartridge.
Replace the MFPC PWB.
Cause
An improper toner cartridge is inserted. (The main 
unit detects a toner cartridge of a different 
specification.)
Toner cartridge trouble.
MFPC PWB trouble.
Check & Remedy
Replace the toner cartridge.
Replace the MFPC PWB.
Cause
An improper toner cartridge is inserted. (The main 
unit detects a toner cartridge of a different 
specification.)
Toner cartridge trouble.
MFPC PWB trouble.
Check & Remedy
Replace the toner cartridge.
Replace the MFPC PWB.
Cause
An improper toner cartridge is inserted. (The main 
unit detects a toner cartridge of a different 
specification.)
Toner cartridge trouble.
MFPC PWB trouble.
Check & Remedy
Replace the toner cartridge.
Replace the MFPC PWB.
Cause
Toner cartridge (CRUM) trouble.
MFPC PWB trouble.
Connector/harness trouble.
Check & Remedy
Replace the toner cartridge.
Replace the MFPC PWB.
Connector/harness trouble.
Cause
Toner cartridge (CRUM) trouble.
MFPC PWB trouble.
Connector/harness trouble.
Check & Remedy
Replace the toner cartridge.
Replace the MFPC PWB.
Connector/harness trouble.
Cause
Toner cartridge (CRUM) trouble.
MFPC PWB trouble.
Connector/harness trouble.
Check & Remedy
Replace the toner cartridge.
Replace the MFPC PWB.
Connector/harness trouble.
Cause
Toner cartridge (CRUM) trouble.
MFPC PWB trouble.
Connector/harness trouble.
Check & Remedy
Replace the toner cartridge.
Replace the MFPC PWB.
Connector/harness trouble.
Cause
Image density sensor trouble
Connection trouble between the MFPC PWB and 
the image density sensor 
Dirt of the image density sensor 
Cleaning failure of the transfer belt
Calibration plate solenoid operation error
Check & Remedy
Connector/harness trouble
Check Calibration plate solenoid operation
Check the surface of the transfer belt
Replace the image density sensor 
Replace the transfer belt 
Replace the calibration plate solenoid
Replace the MPFC PWB
Cause
LUD1 is not turned ON within the specified time.
C2LUD1sensor trouble
Paper feed tray 2 lift unit trouble.
MFPC PWB trouble.
Harness and connector connection trouble.
Check & Remedy
Check connection of the harness and the 
connector of C2LUD.
Replace the lift-up unit.
Replace the MFPC PWB.
Cause
Thermister trouble.
MFPC PWB trouble
Connection trouble of the connector and the 
harness.
Fusing unit not installed.
Check & Remedy
Replace the thermister.
Replace the MFPC PWB.
Harness and connector connection trouble.
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