MX-6240N, MX-7040N (serv.man26). Section 7 Troubleshooting - Updated November 2012 - Sharp Copying Equipment Service Manual (repair manual). Page 51

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MX-7040N  TROUBLESHOOTING  7 – 51
 
U6-86
24V power trouble (2 series)
 
U6-87
Power  unit coolin g  fan moto r  trouble
(2 series)
 
U6-88
EEPROM trouble (2 series)
 
U6-89
Room temperature thermistor 
breakdown (2 series)
 
U6-90
Room humidity thermistor breakdown
(2 series)
 
U7-50
MFPC PWB - Vendor machine 
communication error
 
U7-51
Vendor machine error
 
UC-02
CPT - ASIC error
 
UC-12
CPT - ASIC abnormal trouble 
(DSPF detection)
 
UC-20
DOCC ASIC error
Trouble content
The DC24V power is not supplied to the A3 2-stage 
LCT.
Detail
PCU
Cause
Connection trouble or disconnection of the connector 
and the harness.
A3 2-stage LCT control PWB trouble
Power unit trouble
Check & Remedy
Check the connector and the harness of the power 
line.
Check the 24V voltage with the power unit and the A3 
2-stage LCT control PWB.
Trouble content
A3 2-stage LCT power unit section cooling fan motor 
abnormality
Detail
PCU
Cause
Motor lock, motor harness short/open, A3 2-stage 
LCT control PWB trouble, harness and connector 
connection trouble
Check & Remedy
Check connection from the A3 2-stage LCT control 
PWB to the motor.
Replace the A3 2-stage LCT control PWB. Replace 
the motor.
Trouble content
The EEPROM contents are garbled.
Detail
PCU
Cause
A3 2-stage LCT control PWB trouble
Malfunction caused by noises
Check & Remedy
Replace the A3 2-stage LCT control PWB.
Trouble content
Room temperature thermistor open or short
Detail
PCU
Cause
Room temperature thermistor harness connection 
trouble
Room temperature thermistor trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Check connection of the harness and the connector of 
the room temperature thermistor.
Replace the temperature and humidity sensor.
Check the A3 2-stage LCT control PWB.
Trouble content
Humidity thermistor open or short
Detail
PCU
Cause
Humidity thermistor harness connection trouble
Humidity thermistor trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Check connection of the harness and the connector of 
the humidity thermistor.
Replace the temperature and humidity sensor.
Check the A3 2-stage LCT control PWB.
Trouble content
Communication error between the MFP and the serial 
vendor.
Detail
MFP
Cause
Improper setting of the vendor machine specifications 
(SIM26-3).
Vendor machine trouble.
MFPC PWB trouble.
Connector, harness connection trouble.
Strong external noises.
Check & Remedy
Cancel the error by turning OFF/ON the power.
Check the connector and the harness in the 
communication line.
Change the specifications of the vendor machine 
(SIM26-3).
Replace the MFPC PWB.
Trouble content
Detail
MFP (Notification of a trouble from the serial vendor)
Cause
Serial vendor machine trouble.
Connector, harness connection trouble.
Check & Remedy
Err.XX is displayed on the operation panel of the 
vendor. (XX is the detail code.)
Repair the vendor machine referring to the detail 
code. 
Check the connector and the harness in the 
communication line.
Trouble content
Detail
SCU
Cause
SCU PWB trouble. (CPT-ASIC trouble.)
Check & Remedy
Replace the SCU PWB.
Trouble content
Access abnormality to the CPT - ASIC (when the 
ASIC operates abnormally)
Detail
SCU
Cause
B to B connector connection trouble.
DSPF PWB trouble.
CPT - ASIC trouble.
Check & Remedy
Check the B to B connector.
Replace the DSPF PWB or the Option PWB.
Trouble content
Detail
SCU
Cause
SCU PWB trouble. (DOCC-ASIC trouble.)
Check & Remedy
Replace the SCU PWB.
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