Sharp MX-6500N / MX-7500N (serv.man21) Service Manual ▷ View online
MX-7500N TROUBLESHOOTING 7 – 10
U2
00
MFP EEPROM read/write error
MFP
○
05
Erroneous detection of account management data
MFP
○
11
MFPC PWB EEPROM counter check sum error
MFP
○
30
MFPC PWB and PCU PWB manufacturing No. data inconsistency
MFP
○
40
SD card system storage data area error
MFP
○
41
HDD system storage data area error
MFP
○
42
Machine adjustment data (system storage data area) error
MFP
○
50
HDD user authentication data check sum error
MFP
○
60
Watermark check error
MFP
○
80
SCU PWB EEPROM read/write error
SCU
○
81
SCU PWB EEPROM check sum error
SCU
○
90
PCU PWB EEPROM read/write error
PCU
○
91
PCU PWB EEPROM check sum error
PCU
○
U5
00
Document feed unit communication error
SCU
○
16
Document feed unit fan trouble
SCU
○
30
Document feed unit tray lift up trouble
SCU
○
31
Document feed unit tray lift down trouble
SCU
○
U6
09
LCC lift motor trouble
PCU
○
20
LCC control PWB - PCU PWB communication error
PCU
○
21
LCC transport motor trouble
PCU
○
22
LCC 24V power abnormality
PCU
○
23
A3 LCC tray descending trouble (Reverse winding detection) (A3 LCC)
PCU
○
24
A3 LCC tray lock detection trouble
PCU
○
29
LCT1 lift trouble
PCU
○
33
LCT2 reverse winding detection trouble
PCU
○
34
LCT2 lock detection trouble
PCU
○
39
LCT2 lift trouble
PCU
○
43
LCT3 reverse winding detection trouble
PCU
○
44
LCT3 lock detection trouble
PCU
○
49
LCT3 lift trouble
PCU
○
51
LCC - Main unit combination trouble
PCU
○
53
Communication trouble between LCT’s
PCU
○
54
Option installation combination trouble
PCU
○
63
Manual feed tray descending trouble
PCU
○
68
Manual feed tray paper feed position abnormality
PCU
○
69
Manual feed tray lift trouble
PCU
○
73
LCT4 reverse winding detection trouble
PCU
○
74
LCT4 lock detection trouble
PCU
○
79
LCT4 lift trouble
PCU
○
80
Relay unit transport motor trouble
PCU
○
81
Power unit cooling fan motor trouble
PCU
○
82
EEPROM trouble
PCU
○
83
Room temperature thermistor breakdown
PCU
○
84
Room humidity thermistor breakdown
PCU
○
85
Transport motor 1 trouble (2 series)
PCU
○
86
24V power trouble (2 series)
PCU
○
87
Power unit cooling fan motor trouble (2 series)
PCU
○
88
EEPROM trouble (2 series)
PCU
○
89
Room temperature thermistor breakdown (2 series)
PCU
○
90
Room humidity thermistor breakdown (2 series)
PCU
○
U7
50
MFPC PWB - Vendor machine communication error
MFP
○
51
Vendor machine error
MFP
○
U9
01
Touch panel trouble
SCU
○
UC
02
CPT - ASIC error
SCU
○
12
CPT - ASIC abnormal trouble (DSPF detection)
SCU
○
20
DOCC ASIC error
SCU
○
30
Anti-copy MODULE trouble (DSPF detection)
SCU
○
Trouble code
Trouble content
Trouble
detection
Mechanism
Option
Electricity
FAX
Supply
Main
code
code
Sub
code
MX-7500N TROUBLESHOOTING 7 – 11
G. Details of error codes and countermeasures
A0-01
PCU PWB ROM error
A0-02
SCU PWB ROM error
A0-04
Scanner expansion PWB (ACU)
(ACRE) ROM error
(ACRE) ROM error
A0-10
Color profile error
UE
10
LCT1 suction fan motor trouble
PCU
○
11
LCT1 exhaust fan motor trouble
PCU
○
12
LCT1 warm air heater thermistor open
PCU
○
13
LCT1 warm air heater thermistor low temperature trouble
PCU
○
14
LCT1 warm air heater thermistor high temperature trouble
PCU
○
15
LCT1 warm air outlet port thermistor open
PCU
○
16
LCT1 warm air outlet port thermistor low temperature
PCU
○
17
LCT1 warm air outlet port thermistor high temperature
PCU
○
20
LCT2 suction fan motor trouble
PCU
○
21
LCT2 exhaust fan motor trouble
PCU
○
22
LCT2 warm air heater thermistor open
PCU
○
23
LCT2 warm air heater thermistor low temperature trouble
PCU
○
24
LCT2 warm air heater thermistor high temperature trouble
PCU
○
25
LCT2 warm air outlet port thermistor open
PCU
○
26
LCT2 warm air outlet port thermistor low temperature
PCU
○
27
LCT2 warm air outlet port thermistor high temperature
PCU
○
30
LCT3 suction fan motor trouble
PCU
○
31
LCT3 exhaust fan motor trouble
PCU
○
32
LCT3 warm air heater thermistor open
PCU
○
33
LCT3 warm air heater thermistor low temperature trouble
PCU
○
34
LCT3 warm air heater thermistor high temperature trouble
PCU
○
35
LCT3 warm air outlet port thermistor open
PCU
○
36
LCT3 warm air outlet port thermistor low temperature
PCU
○
37
LCT3 warm air outlet port thermistor high temperature
PCU
○
40
LCT4suction fan motor trouble
PCU
○
41
LCT4 exhaust fan motor trouble
PCU
○
42
LCT4 warm air heater thermistor open
PCU
○
43
LCT4 warm air heater thermistor low temperature trouble
PCU
○
44
LCT4 warm air heater thermistor high temperature trouble
PCU
○
45
LCT4 warm air outlet port thermistor open
PCU
○
46
LCT4 warm air outlet port thermistor low temperature
PCU
○
47
LCT4 warm air outlet port thermistor high temperature
PCU
○
Trouble code
Trouble content
Trouble
detection
Mechanism
Option
Electricity
FAX
Supply
Main
code
code
Sub
code
Detail
MFP
Cause
The firmware version-up is not completed properly by
interruption of the power during the version-up
operation, etc. PCU PWB trouble.
interruption of the power during the version-up
operation, etc. PCU PWB trouble.
Check & Remedy
Use SIM49-1 to perform the firmware version-up
procedure again.Replace the PCU PWB.
procedure again.Replace the PCU PWB.
Detail
MFP
Cause
The firmware version-up is not completed properly by
interruption of the power during the version-up
operation, etc. SCU PWB trouble.
interruption of the power during the version-up
operation, etc. SCU PWB trouble.
Check & Remedy
Use SIM49-1 to perform the firmware version-up
procedure again.
Replace the SCU PWB.
procedure again.
Replace the SCU PWB.
Trouble content
Detail
MFP
Cause
Scanner expansion PWB (ACU) (ACRE) ROM data
error.
An error occurs during firmware upgrading for some
reasons.
error.
An error occurs during firmware upgrading for some
reasons.
Check & Remedy
Perform firmware upgrading again.
Trouble content
Color profile error
Detail
MFP
Cause
The content of the color profile is abnormal.
Combination error between the MFPC PWB firmware
and the color profile
Combination error between the MFPC PWB firmware
and the color profile
Check & Remedy
Upgrade the firmware collectively.
Replace the MFPC PWB.
Replace the MFPC PWB.
MX-7500N TROUBLESHOOTING 7 – 12
A0-15
Incompatible DSK BOOT and program
firmware
firmware
A0-17
Inconsistency between the UI data
and the CPU firmware version
and the CPU firmware version
A0-20
Conflict firmware and EEPROM data
version (MFP)
version (MFP)
A0-21
Conflict firmware and EEPROM data
version (PCU)
version (PCU)
A0-22
Conflict firmware and EEPROM data
version (SCU)
version (SCU)
C1-01
Charger cleaner trouble (K)
C1-03
Charger cleaner trouble (C)
Trouble content
Detail
MFP
Cause
Installation of the normal firmware was performed with
a security kit enable.
a security kit enable.
Check & Remedy
Stop installation of the normal firmware.
Trouble content
Detail
MFP
Cause
Combination error between the UI contents data and
the CPU UI firmware version.
the CPU UI firmware version.
Check & Remedy
Install the firmware in the all-firmware version-up
mode.
mode.
Trouble content
Detail
MFP
Cause
Inconsistency between the MFP firmware version and
the EEPROM data version.
the EEPROM data version.
Check & Remedy
Check the combination of the firmware.
Trouble content
Detail
PCU
Cause
Inconsistency between the PCU firmware version and
the EEPROM data version.
the EEPROM data version.
Check & Remedy
Check the combination of the firmware.
Trouble content
Detail
SCU
Cause
Inconsistency between the SCU firmware version and
the EEPROM data version.
the EEPROM data version.
Check & Remedy
Check the combination of the firmware.
Trouble content
Detail
PCU
Cause
The main charger unit (K) is not installed properly.
There is an abnormality in the main charger unit (K).
Connector connection trouble of the drum unit (K) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
Harness disconnection of the drum unit (K) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
HP sensor dirt.
Charger cleaner motor (K) trouble.
PCU PWB connector connection trouble/PWB trouble.
There is an abnormality in the main charger unit (K).
Connector connection trouble of the drum unit (K) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
Harness disconnection of the drum unit (K) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
HP sensor dirt.
Charger cleaner motor (K) trouble.
PCU PWB connector connection trouble/PWB trouble.
Check & Remedy
Use SIM6-4 to check the operation of the charger
cleaner.
Check disconnection of the main charger unit./
Replace.
Check for disconnection of the connector of the drum
unit (K) HP sensor, the discharge lamp, and the after-
transfer discharge lamp.
Check the harness of the drum unit (K) HP sensor, the
discharge lamp, and the after-transfer discharge lamp.
(Since the earth wire is common to them, check the
three positions.)
Clean the HP sensor.
Check disconnection of the PCU PWB connector./
Replace PWB.
Replace the charger cleaner motor (K).
cleaner.
Check disconnection of the main charger unit./
Replace.
Check for disconnection of the connector of the drum
unit (K) HP sensor, the discharge lamp, and the after-
transfer discharge lamp.
Check the harness of the drum unit (K) HP sensor, the
discharge lamp, and the after-transfer discharge lamp.
(Since the earth wire is common to them, check the
three positions.)
Clean the HP sensor.
Check disconnection of the PCU PWB connector./
Replace PWB.
Replace the charger cleaner motor (K).
Trouble content
Detail
PCU
Cause
The main charger unit (C) is not installed properly.
There is an abnormality in the main charger unit (C).
Connector connection trouble of the drum unit (C) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
Harness disconnection of the drum unit (C) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
HP sensor dirt.
Charger cleaner motor (C) trouble.
PCU PWB connector connection trouble/PWB trouble.
There is an abnormality in the main charger unit (C).
Connector connection trouble of the drum unit (C) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
Harness disconnection of the drum unit (C) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
HP sensor dirt.
Charger cleaner motor (C) trouble.
PCU PWB connector connection trouble/PWB trouble.
Check & Remedy
Use SIM6-4 to check the operation of the charger
cleaner.
Check disconnection of the main charger unit./
Replace.
Check for disconnection of the connector of the drum
unit (C) HP sensor, the discharge lamp, and the after-
transfer discharge lamp.
Check the harness of the drum unit (C) HP sensor, the
discharge lamp, and the after-transfer discharge lamp.
(Since the earth wire is common to them, check the
three positions.)
Clean the HP sensor.
Check disconnection of the PCU PWB connector./
Replace PWB.
Replace the charger cleaner motor (C).
cleaner.
Check disconnection of the main charger unit./
Replace.
Check for disconnection of the connector of the drum
unit (C) HP sensor, the discharge lamp, and the after-
transfer discharge lamp.
Check the harness of the drum unit (C) HP sensor, the
discharge lamp, and the after-transfer discharge lamp.
(Since the earth wire is common to them, check the
three positions.)
Clean the HP sensor.
Check disconnection of the PCU PWB connector./
Replace PWB.
Replace the charger cleaner motor (C).
MX-7500N TROUBLESHOOTING 7 – 13
C1-05
Charger cleaner trouble (M)
C1-07
Charger cleaner trouble (Y)
C1-10
Main charger trouble (Monochrome)
C1-14
Main charger trouble (Color)
C4-00
PTC trouble
C4-01
PTC (Pre Transfer Charger) cleaner
trouble
trouble
Trouble content
Detail
PCU
Cause
The main charger unit (M) is not installed properly.
There is an abnormality in the main charger unit (M).
Connector connection trouble of the drum unit (M) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
Harness disconnection of the drum unit (M) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
HP sensor dirt.
Charger cleaner motor (M) trouble.
PCU PWB connector connection trouble/PWB trouble.
There is an abnormality in the main charger unit (M).
Connector connection trouble of the drum unit (M) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
Harness disconnection of the drum unit (M) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
HP sensor dirt.
Charger cleaner motor (M) trouble.
PCU PWB connector connection trouble/PWB trouble.
Check & Remedy
Use SIM6-4 to check the operation of the charger
cleaner.
Check disconnection of the main charger unit./
Replace.
Check for disconnection of the connector of the drum
unit (M) HP sensor, the discharge lamp, and the after-
transfer discharge lamp.
Check the harness of the drum unit (M) HP sensor,
the discharge lamp, and the after-transfer discharge
lamp. (Since the earth wire is common to them, check
the three positions.)
Clean the HP sensor.
Check disconnection of the PCU PWB connector./
Replace PWB.
Replace the charger cleaner motor (M).
cleaner.
Check disconnection of the main charger unit./
Replace.
Check for disconnection of the connector of the drum
unit (M) HP sensor, the discharge lamp, and the after-
transfer discharge lamp.
Check the harness of the drum unit (M) HP sensor,
the discharge lamp, and the after-transfer discharge
lamp. (Since the earth wire is common to them, check
the three positions.)
Clean the HP sensor.
Check disconnection of the PCU PWB connector./
Replace PWB.
Replace the charger cleaner motor (M).
Trouble content
Detail
PCU
Cause
The main charger unit (Y) is not installed properly.
There is an abnormality in the main charger unit (Y).
Connector connection trouble of the drum unit (Y) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
Harness disconnection of the drum unit (Y) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
HP sensor dirt.
Charger cleaner motor (Y) trouble.
PCU PWB connector connection trouble/PWB trouble.
There is an abnormality in the main charger unit (Y).
Connector connection trouble of the drum unit (Y) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
Harness disconnection of the drum unit (Y) HP
sensor, the discharge lamp, or the after-transfer
discharge lamp.
HP sensor dirt.
Charger cleaner motor (Y) trouble.
PCU PWB connector connection trouble/PWB trouble.
Check & Remedy
Use SIM6-4 to check the operation of the charger
cleaner.
Check disconnection of the main charger unit./
Replace.
Check for disconnection of the connector of the drum
unit (Y) HP sensor, the discharge lamp, and the after-
transfer discharge lamp.
Check the harness of the drum unit (Y) HP sensor, the
discharge lamp, and the after-transfer discharge lamp.
(Since the earth wire is common to them, check the
three positions.)
Clean the HP sensor.
Check disconnection of the PCU PWB connector./
Replace PWB.
Replace the charger cleaner motor (Y).
cleaner.
Check disconnection of the main charger unit./
Replace.
Check for disconnection of the connector of the drum
unit (Y) HP sensor, the discharge lamp, and the after-
transfer discharge lamp.
Check the harness of the drum unit (Y) HP sensor, the
discharge lamp, and the after-transfer discharge lamp.
(Since the earth wire is common to them, check the
three positions.)
Clean the HP sensor.
Check disconnection of the PCU PWB connector./
Replace PWB.
Replace the charger cleaner motor (Y).
Trouble content
Detail
PCU
Cause
The main charger unit (K) is not installed properly.
There is an abnormality in the main charger unit (K).
The developer unit (K) is not installed properly.
There is an abnormality in the developer unit (K).
Disconnection of the high voltage MC PWB connector.
Breakage of the high voltage harness.
High voltage MC PWB trouble.
PCU PWB trouble.
There is an abnormality in the main charger unit (K).
The developer unit (K) is not installed properly.
There is an abnormality in the developer unit (K).
Disconnection of the high voltage MC PWB connector.
Breakage of the high voltage harness.
High voltage MC PWB trouble.
PCU PWB trouble.
Check & Remedy
Check the output of the main charger with SIM8-2.
Check the output of the developing bias with SIM8-1.
Check disconnection of the main charger./Replace.
Check disconnection of the developer unit./Replace.
Check disconnection of the high voltage MC PWB
connector./Replace.
Replace the high voltage MC PWB.
Replace the PCU PWB.
Check the output of the developing bias with SIM8-1.
Check disconnection of the main charger./Replace.
Check disconnection of the developer unit./Replace.
Check disconnection of the high voltage MC PWB
connector./Replace.
Replace the high voltage MC PWB.
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
The main charger unit (CMY) is not installed properly.
There is an abnormality in the main charger unit
(CMY).
The developer unit (CMY) is not installed properly.
There is an abnormality in the developer unit (CMY).
Disconnection of the high voltage MC PWB connector.
Breakage of the high voltage harness.
High voltage MC PWB trouble.
PCU PWB trouble.
There is an abnormality in the main charger unit
(CMY).
The developer unit (CMY) is not installed properly.
There is an abnormality in the developer unit (CMY).
Disconnection of the high voltage MC PWB connector.
Breakage of the high voltage harness.
High voltage MC PWB trouble.
PCU PWB trouble.
Check & Remedy
Check the output of the main charger with SIM8-2.
Check disconnection of the main charger./Replace.
Check disconnection of the developer unit./Replace.
Check disconnection of the high voltage MC PWB
connector./Replace.
Replace the high voltage MC PWB
Replace the PCU PWB.
Check disconnection of the main charger./Replace.
Check disconnection of the developer unit./Replace.
Check disconnection of the high voltage MC PWB
connector./Replace.
Replace the high voltage MC PWB
Replace the PCU PWB.
Trouble content
Detail
PCU
Cause
The PTC unit is not properly installed.
PTC unit trouble.
High voltage 2TC PWB trouble.
PCU PWB trouble.
Connector, harness connection trouble.
PTC unit trouble.
High voltage 2TC PWB trouble.
PCU PWB trouble.
Connector, harness connection trouble.
Check & Remedy
Replace the PTC unit.
Replace the high voltage 2TC PWB.
Replace the PCU PWB.
Check connection of the connector and the harness.
Replace the high voltage 2TC PWB.
Replace the PCU PWB.
Check connection of the connector and the harness.
Trouble content
Shifting the charger cleaner is not completed within
the specified time.
the specified time.
Detail
PCU
Cause
Charger unit trouble
HP sensor, motor, PCU PWB, harness connection
trouble
HP sensor, motor, PCU PWB, harness connection
trouble
Check & Remedy
Check the charger unit, the PCU PWB, and the
harness connection.
harness connection.
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