Sharp MX-6240N / MX-7040N (serv.man26) Service Manual ▷ View online
MX-7040N TROUBLESHOOTING 7 – 33
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)
F2-91
High density process control high
voltage error (K)
F2-92
High density process control high
voltage error (C)
Trouble content
Detail
PCU
Cause
An improper toner cartridge is inserted. (The main unit
detects a toner cartridge of a different specification.)
Toner cartridge trouble.
PCU PWB trouble.
detects a toner cartridge of a different specification.)
Toner cartridge trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
An improper toner cartridge is inserted. (The main unit
detects a toner cartridge of a different specification.)
Toner cartridge trouble.
PCU PWB trouble.
detects a toner cartridge of a different specification.)
Toner cartridge trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
An improper toner cartridge is inserted. (The main unit
detects a toner cartridge of a different specification.)
Toner cartridge trouble.
PCU PWB trouble.
detects a toner cartridge of a different specification.)
Toner cartridge trouble.
PCU PWB trouble.
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
Toner cartridge (CRUM) trouble.
PCU PWB trouble.
Connector and harness trouble between PCU PWB
and toner cartridge
PCU PWB trouble.
Connector and harness trouble between PCU PWB
and toner cartridge
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Check the connector and the harness between the
PCU PWB and the toner cartridge.
Replace the PCU PWB.
Check the connector and the harness between the
PCU PWB and the toner cartridge.
Trouble content
Detail
PCU
Cause
Toner cartridge (CRUM) trouble.
PCU PWB trouble.
Connector and harness trouble between PCU PWB
and toner cartridge
PCU PWB trouble.
Connector and harness trouble between PCU PWB
and toner cartridge
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Check the connector and the harness between the
PCU PWB and the toner cartridge.
Replace the PCU PWB.
Check the connector and the harness between the
PCU PWB and the toner cartridge.
Trouble content
Detail
PCU
Cause
Toner cartridge (CRUM) trouble.
PCU PWB trouble.
Connector and harness trouble between PCU PWB
and toner cartridge
PCU PWB trouble.
Connector and harness trouble between PCU PWB
and toner cartridge
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Check the connector and the harness between the
PCU PWB and the toner cartridge.
Replace the PCU PWB.
Check the connector and the harness between the
PCU PWB and the toner cartridge.
Trouble content
Detail
PCU
Cause
Toner cartridge (CRUM) trouble.
PCU PWB trouble.
Connector and harness trouble between PCU PWB
and toner cartridge
PCU PWB trouble.
Connector and harness trouble between PCU PWB
and toner cartridge
Check & Remedy
Replace the toner cartridge.
Replace the PCU PWB.
Check the connector and the harness between the
PCU PWB and the toner cartridge.
Replace the PCU PWB.
Check the connector and the harness between the
PCU PWB and the toner cartridge.
Trouble content
When executing the high density process control in
the toner cartridge-less production process, the
developing bias exceeds 500V.
the toner cartridge-less production process, the
developing bias exceeds 500V.
Detail
PCU
Cause
• Image density sensor trouble, harness connection
trouble between the PCU PWB and the image
density sensor, dirt on the image density sensor,
transfer belt cleaning trouble
density sensor, dirt on the image density sensor,
transfer belt cleaning trouble
• Developing tank abnormality
Check & Remedy
• Use SIM44-02 to execute the gain adjustment of
the process control sensor.
When "Error" is displayed, it may be considered as
breakdown. Check the sensor and the harness.
When the adjustment is normally completed, check
the drum surface and the belt surface.
When "Error" is displayed, it may be considered as
breakdown. Check the sensor and the harness.
When the adjustment is normally completed, check
the drum surface and the belt surface.
• Replace the developing tank.
Trouble content
When executing the high density process control in
the toner cartridge-less production process, the
developing bias exceeds 500V.
the toner cartridge-less production process, the
developing bias exceeds 500V.
Detail
PCU
Cause
• Image density sensor trouble, harness connection
trouble between the PCU PWB and the image
density sensor, dirt on the image density sensor,
transfer belt cleaning trouble
density sensor, dirt on the image density sensor,
transfer belt cleaning trouble
• Developing tank abnormality
Check & Remedy
• Use SIM44-02 to execute the gain adjustment of
the process control sensor.
When "Error" is displayed, it may be considered as
breakdown. Check the sensor and the harness.
When the adjustment is normally completed, check
the drum surface and the belt surface.
When "Error" is displayed, it may be considered as
breakdown. Check the sensor and the harness.
When the adjustment is normally completed, check
the drum surface and the belt surface.
• Replace the developing tank.
MX-7040N TROUBLESHOOTING 7 – 34
F2-93
High density process control high
voltage error (M)
F2-94
High density process control high
voltage error (Y)
F2-A0
After-transfer discharge lamp open
trouble (K)
F2-A1
After-transfer discharge lamp open
trouble (C)
F2-A2
After-transfer discharge lamp open
trouble (M)
F2-A3
After-transfer discharge lamp open
trouble (Y)
F3-12
Paper feed tray 1 lift operation trouble
Trouble content
When executing the high density process control in
the toner cartridge-less production process, the
developing bias exceeds 500V.
the toner cartridge-less production process, the
developing bias exceeds 500V.
Detail
PCU
Cause
• Image density sensor trouble, harness connection
trouble between the PCU PWB and the image
density sensor, dirt on the image density sensor,
transfer belt cleaning trouble
density sensor, dirt on the image density sensor,
transfer belt cleaning trouble
• Developing tank abnormality
Check & Remedy
• Use SIM44-02 to execute the gain adjustment of
the process control sensor.
When "Error" is displayed, it may be considered as
breakdown. Check the sensor and the harness.
When the adjustment is normally completed, check
the drum surface and the belt surface.
When "Error" is displayed, it may be considered as
breakdown. Check the sensor and the harness.
When the adjustment is normally completed, check
the drum surface and the belt surface.
• Replace the developing tank.
Trouble content
When executing the high density process control in
the toner cartridge-less production process, the
developing bias exceeds 500V.
the toner cartridge-less production process, the
developing bias exceeds 500V.
Detail
PCU
Cause
• Image density sensor trouble, harness connection
trouble between the PCU PWB and the image
density sensor, dirt on the image density sensor,
transfer belt cleaning trouble
density sensor, dirt on the image density sensor,
transfer belt cleaning trouble
• Developing tank abnormality
Check & Remedy
• Use SIM44-02 to execute the gain adjustment of
the process control sensor.
When "Error" is displayed, it may be considered as
breakdown. Check the sensor and the harness.
When the adjustment is normally completed, check
the drum surface and the belt surface.
When "Error" is displayed, it may be considered as
breakdown. Check the sensor and the harness.
When the adjustment is normally completed, check
the drum surface and the belt surface.
• Replace the developing tank.
Trouble content
The after-transfer discharge lamp open sensor is kept
open for a specified time from turning ON the after-
transfer discharge lamp.
open for a specified time from turning ON the after-
transfer discharge lamp.
Detail
PCU
Cause
Connection trouble between the after-transfer
discharge lamp PWB and the PCU PWB
After-transfer discharge lamp PWB trouble
PCU PWB trouble
discharge lamp PWB and the PCU PWB
After-transfer discharge lamp PWB trouble
PCU PWB trouble
Check & Remedy
Use SIM5-4 to check lighting of the after-transfer
discharge lamp (K) [DL2_K].
Check the after-transfer discharge lamp PWB (K).
Check the harness and the connector.
Replace the PCU PWB.
discharge lamp (K) [DL2_K].
Check the after-transfer discharge lamp PWB (K).
Check the harness and the connector.
Replace the PCU PWB.
Trouble content
The after-transfer discharge lamp open sensor is kept
open for a specified time from turning ON the after-
transfer discharge lamp.
open for a specified time from turning ON the after-
transfer discharge lamp.
Detail
PCU
Cause
Connection trouble between the after-transfer
discharge lamp PWB and the PCU PWB
After-transfer discharge lamp PWB trouble
PCU PWB trouble
discharge lamp PWB and the PCU PWB
After-transfer discharge lamp PWB trouble
PCU PWB trouble
Check & Remedy
Use SIM5-4 to check lighting of the after-transfer
discharge lamp (C) [DL2_C].
Check the after-transfer discharge lamp PWB (C).
Check the harness and the connector.
Replace the PCU PWB.
discharge lamp (C) [DL2_C].
Check the after-transfer discharge lamp PWB (C).
Check the harness and the connector.
Replace the PCU PWB.
Trouble content
The after-transfer discharge lamp open sensor is kept
open for a specified time from turning ON the after-
transfer discharge lamp.
open for a specified time from turning ON the after-
transfer discharge lamp.
Detail
PCU
Cause
Connection trouble between the after-transfer
discharge lamp PWB and the PCU PWB
After-transfer discharge lamp PWB trouble
PCU PWB trouble
discharge lamp PWB and the PCU PWB
After-transfer discharge lamp PWB trouble
PCU PWB trouble
Check & Remedy
Use SIM5-4 to check lighting of the after-transfer
discharge lamp (M) [DL2_M].
Check the after-transfer discharge lamp PWB (M).
Check the harness and the connector.
Replace the PCU PWB.
discharge lamp (M) [DL2_M].
Check the after-transfer discharge lamp PWB (M).
Check the harness and the connector.
Replace the PCU PWB.
Trouble content
The after-transfer discharge lamp open sensor is kept
open for a specified time from turning ON the after-
transfer discharge lamp.
open for a specified time from turning ON the after-
transfer discharge lamp.
Detail
PCU
Cause
Connection trouble between the after-transfer
discharge lamp PWB and the PCU PWB
After-transfer discharge lamp PWB trouble
PCU PWB trouble
discharge lamp PWB and the PCU PWB
After-transfer discharge lamp PWB trouble
PCU PWB trouble
Check & Remedy
Use SIM5-4 to check lighting of the after-transfer
discharge lamp (Y) [DL2_Y].
Check the after-transfer discharge lamp PWB (Y).
Check the harness and the connector.
Replace the PCU PWB.
discharge lamp (Y) [DL2_Y].
Check the after-transfer discharge lamp PWB (Y).
Check the harness and the connector.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
LUD1 is not turned ON within the specified time.
CLUD1 sensor trouble.
Paper feed tray 1 lift unit trouble.
PCU PWB trouble.
Sensor harness and connector connection trouble
CLUD1 sensor trouble.
Paper feed tray 1 lift unit trouble.
PCU PWB trouble.
Sensor harness and connector connection trouble
Check & Remedy
Check connection of the harness and the connector of
LUD1.
Replace the lift unit.
Replace the PCU PWB.
LUD1.
Replace the lift unit.
Replace the PCU PWB.
MX-7040N TROUBLESHOOTING 7 – 35
F3-22
Paper feed tray 2 lift operation trouble
F3-32
Main body cassette 3 lift trouble
F3-42
Main body cassette 4 lift trouble
F6-00
MFPC PWB - FAX communication
trouble
F6-01
FAX control PWB EEPROM read/write
error
F6-04
FAX MODEM operation trouble
F6-21
Improper combination of TEL/LIU
PWB and FAX soft switch
F6-30
FAX 1-chip microprocessor access
error (FAX detection)
Trouble content
LUD2 does not turn ON within the specified time.
Detail
PCU
Cause
LUD2 does not turn ON within the specified time.
CLUD2 sensor trouble.
Paper feed tray 2 lift unit trouble.
PCU PWB trouble.
Sensor harness and connector connection trouble
CLUD2 sensor trouble.
Paper feed tray 2 lift unit trouble.
PCU PWB trouble.
Sensor harness and connector connection trouble
Check & Remedy
Check the harness and the connector of LUD2.
Replace the lift unit.
Replace the PCU PWB.
Replace the lift unit.
Replace the PCU PWB.
Trouble content
C3LUD does not turn ON within the specified time.
Detail
PCU
Cause
C3LUD sensor trouble.
Cassette 3 lift motor trouble.
Harness connection trouble between the PCU PWB,
the lift unit, and the paper feed unit
Cassette 3 lift motor trouble.
Harness connection trouble between the PCU PWB,
the lift unit, and the paper feed unit
Check & Remedy
Check the harness and the connector of C3LUD.
Check the lift unit.
Check the lift unit.
Trouble content
C4LUD does not turn ON within the specified time.
Detail
PCU
Cause
C4LUD sensor trouble.
Cassette 4 lift motor trouble.
Harness connection trouble between the PCU PWB,
the lift unit, and the paper feed unit
Cassette 4 lift motor trouble.
Harness connection trouble between the PCU PWB,
the lift unit, and the paper feed unit
Check & Remedy
Check the harness and the connector of C4LUD.
Check the lift unit.
Check the lift unit.
Trouble content
MFP - FAX communication establishment error /
Framing / Parity / Protocol error
Framing / Parity / Protocol error
Section
MFP
Case 1
Cause
FAX control PWB trouble.
Check
and
Remedy
and
Remedy
Replace the FAX control PWB.
Case 2
Cause
FAX control PWB - MFPC PWB connector and
harness trouble
harness trouble
Check
and
Remedy
and
Remedy
Check the connector and the harness between the
FAX control PWB and the MFPC PWB.
FAX control PWB and the MFPC PWB.
Case 3
Cause
FAX control PWB - Mother board connector and
harness trouble
harness trouble
Check
and
Remedy
and
Remedy
Check the connector and the harness between the
FAX control PWB and the mother board.
FAX control PWB and the mother board.
Case 4
Cause
FAX control PWB ROM trouble / ROM pin breakage
Check
and
Remedy
and
Remedy
Check the ROM of the FAX control PWB.
Trouble content
FAX control PWB EEPROM access error (Read and
write)
write)
Section
FAX
Case 1
Cause
FAX control PWB EEPROM trouble
Check
and
Remedy
and
Remedy
Check that no trouble occurs after replacement of
EEPROM. Execute the memory check of SIM66-3 to
insure that EEPROM can be accessed.
EEPROM. Execute the memory check of SIM66-3 to
insure that EEPROM can be accessed.
Case 2
Cause
FAX control PWB EEPROM access circuit trouble
Check
and
Remedy
and
Remedy
Replace the FAX control PWB.
Trouble content
FAX control PWB MODEM chip operation trouble
Section
FAX
Case 1
Cause
FAX MODEM chip operation trouble.
Check
and
remedy
and
remedy
Replace the FAX control PWB.
Case 2
Cause
The FAX MODEM chip cannot be accessed.
Check
and
Remedy
and
Remedy
Replace the FAX control PWB.
Trouble content
Incompatibility between the TEL/LIU PWB and the
FAX control PWB information (soft switch)
FAX control PWB information (soft switch)
Section
FAX
Case 1
Cause
The destination of the TEL/LIU PWB installed is
improper.
improper.
Check
and
Remedy
and
Remedy
Check the destination of the TEL/LIU PWB.
Case 2
Cause
TEL/LIU PWB trouble.
Check
and
Remedy
and
Remedy
Replace the TEL/LIU PWB.
Trouble content
FAX 1-chip microprocessor access error (Read and
write)
write)
Section
FAX
Case 1
Cause
Program writing trouble to the 1-chip microprocessor,
or no program data written.
or no program data written.
Check
and
Remedy
and
Remedy
Use SIM66-42 to rewrite the 1-chip microprocessor
program.
program.
Case 2
Cause
FAX 1-chip microprocessor circuit trouble.
Check
and
Remedy
and
Remedy
Replace the FAX control PWB.
MX-7040N TROUBLESHOOTING 7 – 36
F6-97
Incompatibility between FAX control
PWB and the main machine
F6-98
Incompatibility between the FAX
control PWB destination and the main
machine destination
F9-91
Communication error between MFP
and the printer section when booting
F9-92
Printer (section) PWB hardware error
H2-00
Thermistor open trouble
(TH_UM_AD2)
H2-01
Non-contact thermistor lower main
detection thermistor open
(TH_LM1_AD2)
H2-02
Non-contact thermistor upper sub
detection thermistor open
(TH_US1_AD2)
H2-03
Non-contact thermistor upper main
compensation thermistor open
(TH_UM_CS)
Trouble content
Incompatibility between FAX control PWB and the
main machine
main machine
Section
MFP
Case 1
Cause
The FAX control PWB installed is improper.
FAX control PWB trouble.
FAX control PWB trouble.
Check
and
Remedy
and
Remedy
Install a proper FAX control PWB.
Replace the FAX control PWB.
Replace the FAX control PWB.
Trouble content
Incompatibility between the FAX control PWB
destination and the main machine destination
destination and the main machine destination
Section
MFP
Case 1
Cause
Incompatibility between the destination information
written into the FAX control PWB EEPROM and that
in the main machine (set with SIM26-6)
written into the FAX control PWB EEPROM and that
in the main machine (set with SIM26-6)
Check
and
Remedy
and
Remedy
1)
Check the destination of the FAX control PWB.
2)
Check the destination of the machine. (SIM26-6)
Trouble content
Booting of the printer section cannot be recognized
when booting.
when booting.
Detail
MFP
Cause
MFPC (section) PWB trouble.
Printer (section) PWB trouble.
Printer flash ROM trouble.
MFPC (section) PWB - printer (section) PWB
connection trouble.
Printer (section) PWB trouble.
Printer flash ROM trouble.
MFPC (section) PWB - printer (section) PWB
connection trouble.
Check & Remedy
Replace the MFPC (section) PWB.
Replace the printer (section) PWB.
Replace the printer flash ROM.
Check connection between the MFPC (section) PWB
and the printer (section) PWB.
Replace the printer (section) PWB.
Replace the printer flash ROM.
Check connection between the MFPC (section) PWB
and the printer (section) PWB.
Trouble content
Detail
Printer (section) PWB
Cause
Printer PWB trouble
Font ROM contact trouble or error
DIMM memory contact trouble or error
Font ROM contact trouble or error
DIMM memory contact trouble or error
Check & Remedy
Replace the printer PWB.
Check the font ROM socket.
Check the DIMM memory socket.
Check the font ROM.
Replace the DIMM memory.
Check the font ROM socket.
Check the DIMM memory socket.
Check the font ROM.
Replace the DIMM memory.
Trouble content
Detail
PCU
Cause
Thermistor trouble
PCU PWB trouble
Thermistor connector and harness connection trouble
Fusing section connector connection trouble
Fusing unit not installed
PCU PWB trouble
Thermistor connector and harness connection trouble
Fusing section connector connection trouble
Fusing unit not installed
Check & Remedy
Use SIM44-14 to check the state of the thermistor.
Replace the thermistor.
Replace the PCU PWB.
Check connection of the thermistor connector and the
harness.
Check the connector in the fusing section.
Replace the thermistor.
Replace the PCU PWB.
Check connection of the thermistor connector and the
harness.
Check the connector in the fusing section.
Trouble content
The thermistor is open.
Detail
PCU
Cause
Thermistor trouble
Control PWB trouble
Fusing section connector connection trouble
AC power trouble
Fusing unit not installed.
Control PWB trouble
Fusing section connector connection trouble
AC power trouble
Fusing unit not installed.
Check & Remedy
Check connection of the harness and the connector
from the thermistor to the control PWB.
from the thermistor to the control PWB.
Trouble content
The thermistor is open.
Detail
PCU
Cause
Thermistor trouble
Control PWB trouble
Fusing section connector connection trouble
AC power trouble
Fusing unit not installed.
Control PWB trouble
Fusing section connector connection trouble
AC power trouble
Fusing unit not installed.
Check & Remedy
Check connection of the harness and the connector
from the thermistor to the control PWB.
from the thermistor to the control PWB.
Trouble content
The thermistor is open.
Detail
PCU
Cause
Thermistor trouble
Control PWB trouble
Fusing section connector connection trouble
AC power trouble
Fusing unit not installed.
Control PWB trouble
Fusing section connector connection trouble
AC power trouble
Fusing unit not installed.
Check & Remedy
Check connection of the harness and the connector
from the thermistor to the control PWB.
from the thermistor to the control PWB.
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