Sharp MX-5500N / MX-6200N / MX-7000N (serv.man47) Service Manual ▷ View online
MX-7000N SELF DIAG AND TROUBLE CODE 8 – 21
F2-78
Registration exclusive image density
sensor trouble (Transfer belt surface
reflection ratio abnormality)
sensor trouble (Transfer belt surface
reflection ratio abnormality)
F2-80
Half tone process control 1st patch
reference value trouble (K)
reference value trouble (K)
F2-81
Half tone process control 1st patch
reference value trouble (C)
reference value trouble (C)
F2-82
Half tone process control 1st patch
reference value trouble (M)
reference value trouble (M)
F2-83
Half tone process control 1st patch
reference value trouble (Y)
reference value trouble (Y)
F2-84
Half tone process control 2nd patch
reference value trouble (K)
reference value trouble (K)
Trouble content
The transfer belt surface is scanned by the image
density sensor before starting the registration, and
adjust the sensor gain so that the output is kept at
a certain level. However, the output is not within
the specified range though the senor gain is
adjusted.
density sensor before starting the registration, and
adjust the sensor gain so that the output is kept at
a certain level. However, the output is not within
the specified range though the senor gain is
adjusted.
Section
PCU
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU PWB and the image density
sensor, image density sensor dirt, transfer belt
cleaning trouble, calibration plate solenoid
operation trouble
trouble between PCU PWB and the image density
sensor, image density sensor dirt, transfer belt
cleaning trouble, calibration plate solenoid
operation trouble
Check and
remedy
remedy
Check the sensor and the harness. Check the
calibration plate solenoid operation and the
transfer belt surface state.
If the trouble is not cleared, replace the image
sensor exclusively used for registration, replace
the transfer belt, replace the calibration plate
solenoid, or replace the PCU PWB according to
the check result.
calibration plate solenoid operation and the
transfer belt surface state.
If the trouble is not cleared, replace the image
sensor exclusively used for registration, replace
the transfer belt, replace the calibration plate
solenoid, or replace the PCU PWB according to
the check result.
Trouble content
The low-density rising point or the high-density
saturation point cannot be calculated because of a
calculation error in the primary approximation
formula of the sensor output ratio for the LSU
PWM value obtained from the first step patch print
result when executing the half tone process control
in BK.
saturation point cannot be calculated because of a
calculation error in the primary approximation
formula of the sensor output ratio for the LSU
PWM value obtained from the first step patch print
result when executing the half tone process control
in BK.
Section
MFP
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
Check and
remedy
remedy
Use SIM44-2 to execute the process control
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
Trouble content
The low-density rising point or the high-density
saturation point cannot be calculated because of a
calculation error in the primary approximation
formula of the sensor output ratio for the LSU
PWM value obtained from the first step patch print
result when executing the half tone process control
in C.
saturation point cannot be calculated because of a
calculation error in the primary approximation
formula of the sensor output ratio for the LSU
PWM value obtained from the first step patch print
result when executing the half tone process control
in C.
Section
MFP
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
Check and
remedy
remedy
Use SIM44-2 to execute the process control
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
Trouble content
The low-density rising point or the high-density
saturation point cannot be calculated because of a
calculation error in the primary approximation
formula of the sensor output ratio for the LSU
PWM value obtained from the first step patch print
result when executing the half tone process control
in M.
saturation point cannot be calculated because of a
calculation error in the primary approximation
formula of the sensor output ratio for the LSU
PWM value obtained from the first step patch print
result when executing the half tone process control
in M.
Section
MFP
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
Check and
remedy
remedy
Use SIM44-2 to execute the process control
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
Trouble content
The low-density rising point or the high-density
saturation point cannot be calculated because of a
calculation error in the primary approximation
formula of the sensor output ratio for the LSU
PWM value obtained from the first step patch print
result when executing the half tone process control
in Y.
saturation point cannot be calculated because of a
calculation error in the primary approximation
formula of the sensor output ratio for the LSU
PWM value obtained from the first step patch print
result when executing the half tone process control
in Y.
Section
MFP
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
Check and
remedy
remedy
Use SIM44-2 to execute the process control
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
Trouble content
The low-density section output is greater than the
middle-density section output when connecting the
low-density section approximation formula and the
middle-density section approximation formula
(formula of the sensor output ratio for the LSU
PWM value) from the second step patch print
result when executing the half tone process control
in BK.
middle-density section output when connecting the
low-density section approximation formula and the
middle-density section approximation formula
(formula of the sensor output ratio for the LSU
PWM value) from the second step patch print
result when executing the half tone process control
in BK.
Section
MFP
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
Check and
remedy
remedy
Use SIM44-2 to execute the process control
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
MX-7000N SELF DIAG AND TROUBLE CODE 8 – 22
F2-85
Half tone process control 2nd patch
reference value trouble (C)
reference value trouble (C)
F2-86
Half tone process control 2nd patch
reference value trouble (M)
reference value trouble (M)
F2-87
Half tone process control 2nd patch
reference value trouble (Y)
reference value trouble (Y)
F2-92
High-density process control density
correction error (C)
correction error (C)
F2-93
High-density process control density
correction error (M)
correction error (M)
F2-94
High-density process control density
correction error (Y)
correction error (Y)
Trouble content
The low-density section output is greater than the
middle-density section output when connecting the
low-density section approximation formula and the
middle-density section approximation formula
(formula of the sensor output ratio for the LSU
PWM value) from the second step patch print
result when executing the half tone process control
in C.
middle-density section output when connecting the
low-density section approximation formula and the
middle-density section approximation formula
(formula of the sensor output ratio for the LSU
PWM value) from the second step patch print
result when executing the half tone process control
in C.
Section
MFP
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
Check and
remedy
remedy
Use SIM44-2 to execute the process control
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
Trouble content
The low-density section output is greater than the
middle-density section output when connecting the
low-density section approximation formula and the
middle-density section approximation formula
(formula of the sensor output ratio for the LSU
PWM value) from the second step patch print
result when executing the half tone process control
in M.
middle-density section output when connecting the
low-density section approximation formula and the
middle-density section approximation formula
(formula of the sensor output ratio for the LSU
PWM value) from the second step patch print
result when executing the half tone process control
in M.
Section
MFP
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
Check and
remedy
remedy
Use SIM44-2 to execute the process control
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
Trouble content
The low-density section output is greater than the
middle-density section output when connecting the
low-density section approximation formula and the
middle-density section approximation formula
(formula of the sensor output ratio for the LSU
PWM value) from the second step patch print
result when executing the half tone process control
in Y.
middle-density section output when connecting the
low-density section approximation formula and the
middle-density section approximation formula
(formula of the sensor output ratio for the LSU
PWM value) from the second step patch print
result when executing the half tone process control
in Y.
Section
MFP
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
trouble between PCU sub PWB and the image
density sensor, image density sensor dirt, transfer
belt cleaning trouble
Check and
remedy
remedy
Use SIM44-2 to execute the process control
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
sensor gain adjustment. If "ERROR" is displayed,
check the sensor and the harness. If the
adjustment is completed, check the drum surface
state and the belt surface state.
Trouble content
The patch density value is not in the range of the
density correction reference density value (STD
value)
density correction reference density value (STD
value)
±30% at the upper limit or the lower limit
bias voltage when executing the high density
process control.
process control.
Section
PCU
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU PWB and image density
sensor, dirt on image density sensor, transfer belt
cleaning trouble
trouble between PCU PWB and image density
sensor, dirt on image density sensor, transfer belt
cleaning trouble
Check and
remedy
remedy
1)
Use SIM44-2 to execute the process control
sensor gain adjustment.
sensor gain adjustment.
2)
If an error occurs, check the sensors and the
harnesses.
harnesses.
3)
If the adjustment of 1) is completed, check
the drum surface state, the belt surface state,
etc.
the drum surface state, the belt surface state,
etc.
Trouble content
The patch density value is not in the range of the
density correction reference density value (STD
value)
density correction reference density value (STD
value)
±30% at the upper limit or the lower limit
bias voltage when executing the high density
process control.
process control.
Section
PCU
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU PWB and image density
sensor, dirt on image density sensor, transfer belt
cleaning trouble
trouble between PCU PWB and image density
sensor, dirt on image density sensor, transfer belt
cleaning trouble
Check and
remedy
remedy
1)
Use SIM44-2 to execute the process control
sensor gain adjustment.
sensor gain adjustment.
2)
If an error occurs, check the sensors and the
harnesses.
harnesses.
3)
If the adjustment of 1) is completed, check
the drum surface state, the belt surface state,
etc.
the drum surface state, the belt surface state,
etc.
Trouble content
The patch density value is not in the range of the
density correction reference density value (STD
value)
density correction reference density value (STD
value)
±30% at the upper limit or the lower limit
bias voltage when executing the high density
process control.
process control.
Section
PCU
Case 1
Cause
Image density sensor trouble, harness connection
trouble between PCU PWB and image density
sensor, dirt on image density sensor, transfer belt
cleaning trouble
trouble between PCU PWB and image density
sensor, dirt on image density sensor, transfer belt
cleaning trouble
Check and
remedy
remedy
1)
Use SIM44-2 to execute the process control
sensor gain adjustment.
sensor gain adjustment.
2)
If an error occurs, check the sensors and the
harnesses.
harnesses.
3)
If the adjustment of 1) is completed, check
the drum surface state, the belt surface state,
etc.
the drum surface state, the belt surface state,
etc.
MX-7000N SELF DIAG AND TROUBLE CODE 8 – 23
F3-12
Tray 1 lift-up trouble
F3-22
Tray 2 lift-up trouble
F3-32
Tray 3 lift-up trouble
F3-42
Tray 4 lift-up trouble
F9-00
Communication trouble between the
controller and the printer controller
(FIERY option)
controller and the printer controller
(FIERY option)
H2-00
Detection thermistor open (TH1_AD2)
of the non-contact thermistor
of the non-contact thermistor
H2-01
Lower thermistor open (TH_LM)
H2-02
Sub thermistor open (TH_US)
H2-03
Non-contact thermistor
compensation thermistor open
(TH1_AD1)
compensation thermistor open
(TH1_AD1)
Trouble content
T1LUD does not turn ON within the specified time.
Section
PCU
Case 1
Cause
T1LUD sensor trouble. Harness connection trouble
between PCU PWB, the lift-up unit, and the paper
feed unit.
between PCU PWB, the lift-up unit, and the paper
feed unit.
Check and
remedy
remedy
Check the harness and the connector of T1LUD.
Case 2
Cause
Tray 1 lift-up motor trouble
Check and
remedy
remedy
Check the lift-up unit.
Trouble content
T2LUD does not turn ON within the specified time.
Section
PCU
Case 1
Cause
T2LUD sensor trouble. Harness connection trouble
between PCU PWB, the lift-up unit, and the paper
feed unit.
between PCU PWB, the lift-up unit, and the paper
feed unit.
Check and
remedy
remedy
Check the harness and the connector of T2LUD.
Case 2
Cause
Tray 2 lift-up motor trouble
Check and
remedy
remedy
Check the lift-up unit.
Trouble content
LUD3 does not turn ON within the specified time.
Section
PCU
Case 1
Cause
LUD3 sensor trouble. Harness connection trouble
between PCU PWB, the lift-up unit, and the paper
feed unit.
between PCU PWB, the lift-up unit, and the paper
feed unit.
Check and
remedy
remedy
Check the harness and the connector of LUD3.
Case 2
Cause
Tray 3 lift-up motor trouble
Check and
remedy
remedy
Check the lift-up unit.
Trouble content
LUD4 does not turn ON within the specified time.
Section
PCU
Case 1
Cause
LUD4 sensor trouble. Harness connection trouble
between PCU PWB, the lift-up unit, and the paper
feed unit.
between PCU PWB, the lift-up unit, and the paper
feed unit.
Check and
remedy
remedy
Check the harness and the connector of LUD4.
Case 2
Cause
Tray 4 lift-up motor trouble
Check and
remedy
remedy
Check the lift-up unit.
Trouble content
A communication error is detected during initial
establishment or after establishment of
communication with the controller (FIERY option).
establishment or after establishment of
communication with the controller (FIERY option).
Section
MFP
Case 1
Cause
Printer controller MFPcnt PWB cable trouble
Check and
remedy
remedy
Check the printer controller MFPcnt PWB cable.
Case 2
Cause
MFPcnt PWB trouble, printer controller PWB
trouble
trouble
Check and
remedy
remedy
Replace the MFPcnt PWB. Repair or replace the
printer controller PWB.
After completion of check, turn OFF/ON the
machine and the printer controller.
printer controller PWB.
After completion of check, turn OFF/ON the
machine and the printer controller.
Trouble content
Thermistor open
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing
section connector connection trouble, AC power
source trouble, fusing unit not-installed
section connector connection trouble, AC power
source trouble, fusing unit not-installed
Check and
remedy
remedy
Check the harness and the connector from the
thermistor to the control PWB.
thermistor to the control PWB.
Trouble content
Thermistor open
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing
section connector connection trouble, AC power
source trouble, fusing unit not-installed
section connector connection trouble, AC power
source trouble, fusing unit not-installed
Check and
remedy
remedy
Check the harness and the connector from the
thermistor to the control PWB.
thermistor to the control PWB.
Trouble content
Thermistor open
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing
section connector connection trouble, AC power
source trouble, fusing unit not-installed
section connector connection trouble, AC power
source trouble, fusing unit not-installed
Check and
remedy
remedy
Check the harness and the connector from the
thermistor to the control PWB.
thermistor to the control PWB.
Trouble content
Thermistor open
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing
section connector connection trouble, AC power
source trouble
section connector connection trouble, AC power
source trouble
Check and
remedy
remedy
Check the harness and the connector from the
thermistor to the control PWB.
thermistor to the control PWB.
MX-7000N SELF DIAG AND TROUBLE CODE 8 – 24
H2-04
External heating thermistor open
(TH_EX1)
(TH_EX1)
H2-05
Fusing external heating thermistor
open (TH_EX2)
open (TH_EX2)
H3-00
Fusing section high temperature
trouble (TH_UM)
trouble (TH_UM)
H3-01
Fusing section high temperature
trouble (TH_LM)
trouble (TH_LM)
H3-02
Sub thermistor fusing section high
temperature trouble (TH_US)
temperature trouble (TH_US)
H3-04
External heating thermistor high
temperature trouble (TH_EX1)
temperature trouble (TH_EX1)
H3-05
Fusing external thermistor high
temperature trouble (TH_EX2)
temperature trouble (TH_EX2)
Trouble content
Thermistor open
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing
section connector connection trouble, AC power
source trouble
section connector connection trouble, AC power
source trouble
Check and
remedy
remedy
Check the harness and the connector from the
thermistor to the control PWB.
thermistor to the control PWB.
Trouble content
Thermistor open
Section
PCU
Case 1
Cause
Fusing section connector and harness connection
trouble
trouble
Check and
remedy
remedy
Check the harness and the connector from the
thermistor to the PCU PWB.
thermistor to the PCU PWB.
Case 2
Cause
Thermistor trouble, PCU PWB trouble
Check and
remedy
remedy
Replace the thermistor or the PCU PWB.
Trouble content
The fusing temperature inside the PWB exceeds
the specified level.
the specified level.
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power
source trouble
section connector connection error, AC power
source trouble
Check and
remedy
remedy
1)
Use SIM5-2 to check blinking of the heater
lamp.
lamp.
2)
If it blinks normally, check the thermistor and
the harness.
Check the control PWB thermistor input
circuit section.
the harness.
Check the control PWB thermistor input
circuit section.
3)
If the heater lamp keep lighting, check the AC
PWB and the control PWB lamp control
circuit.
PWB and the control PWB lamp control
circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The fusing temperature inside the PWB exceeds
the specified level.
the specified level.
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power
source trouble
section connector connection error, AC power
source trouble
Check and
remedy
remedy
1)
Use SIM5-2 to check blinking of the heater
lamp.
lamp.
2)
If it blinks normally, check the thermistor and
the harness.
Check the control PWB thermistor input
circuit section.
the harness.
Check the control PWB thermistor input
circuit section.
3)
If the heater lamp keep lighting, check the AC
PWB and the control PWB lamp control
circuit.
PWB and the control PWB lamp control
circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The fusing temperature inside the PWB exceeds
the specified level.
the specified level.
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power
source trouble
section connector connection error, AC power
source trouble
Check and
remedy
remedy
1)
Use SIM5-2 to check blinking of the heater
lamp.
lamp.
2)
If it blinks normally, check the thermistor and
the harness.
Check the control PWB thermistor input
circuit section.
the harness.
Check the control PWB thermistor input
circuit section.
3)
If the heater lamp keep lighting, check the AC
PWB and the control PWB lamp control
circuit.
PWB and the control PWB lamp control
circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The external heating thermistor temperature
exceeds the specified temperature.
exceeds the specified temperature.
Section
PCU
Case 1
Cause
Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power
source trouble
section connector connection error, AC power
source trouble
Check and
remedy
remedy
1)
Use Sim44-14 to check if the thermistor
(TH_EX1) shows an abnormal temperature. If
the display is normal, use Sim5-2 to check
the blinking operation of the heater lamp.
a)
(TH_EX1) shows an abnormal temperature. If
the display is normal, use Sim5-2 to check
the blinking operation of the heater lamp.
a)
If it blinks normally, check the thermistor
and the harness.
Check the control PWB thermistor input
circuit section.
and the harness.
Check the control PWB thermistor input
circuit section.
b)
If the heater lamp keep lighting, check
the AC PWB and the control PWB lamp
control circuit.
the AC PWB and the control PWB lamp
control circuit.
2)
Use SIM14 to cancel the trouble.
Trouble content
It is detected that the fusing temperature exceeds
the specified temperature.
the specified temperature.
Section
PCU
Case 1
Cause
Fusing section connector and harness connection
trouble
trouble
Check and
remedy
remedy
Check the harness and the connector from the
thermistor to the PCU PWB.
Use SIM14 to cancel the trouble.
thermistor to the PCU PWB.
Use SIM14 to cancel the trouble.
Case 2
Cause
Thermistor trouble, PCU PWB trouble
Check and
remedy
remedy
Replace the thermistor or the PCU PWB.
Use SIM14 to cancel the trouble.
Use SIM14 to cancel the trouble.
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