Sharp MX-M350N / MX-M350U / MX-M450N / MX-M450U (serv.man8) Service Manual ▷ View online
MX-M350/M450 N/U TROUBLE CODES 11 - 9
F6
98
Content
Combination error of the FAX-BOX
destination information and the
machine destination information
destination information and the
machine destination information
Detail
Combination error of the FAX-BOX
destination information and the
machine destination information
destination information and the
machine destination information
Cause
Because of improper combination
between the destination information
stored in the EEPROM on the FAX-
BOX PWB and that of the machine (set
with SIM 26-6).
between the destination information
stored in the EEPROM on the FAX-
BOX PWB and that of the machine (set
with SIM 26-6).
Check and
remedy
remedy
Check the destination of the FAX-BOX.
Check the machine destination with
SIM 26-6.
Use a proper combination of the
machine and the FAX-BOX.
Check the machine destination with
SIM 26-6.
Use a proper combination of the
machine and the FAX-BOX.
F7
01
Content
FAX board EEPROM read/write error
Details
EEPROM access error (read/write)
Cause
EEPROM trouble
FAX PWB EEPROM access circuit
trouble
FAX PWB EEPROM access circuit
trouble
Check &
Remedy
Remedy
When replacing the EEPROM, use
SIM66-4/5 (Signal send level) and
SIM66-14/15/16 (Dial test) for
adjustment. However, note that all the
soft switches are reset to the initial
values.
No need to adjust when the PWB is
replaced.
SIM66-4/5 (Signal send level) and
SIM66-14/15/16 (Dial test) for
adjustment. However, note that all the
soft switches are reset to the initial
values.
No need to adjust when the PWB is
replaced.
H2
00···
HL1
01···
HL2
Content
Thermistor open
Fusing unit not installed
Fusing unit not installed
Detail
Thermistor is open.
(An input voltage of 2.92V or above is
detected.)
Fusing unit not installed
(An input voltage of 2.92V or above is
detected.)
Fusing unit not installed
Cause
Thermistor trouble
Control PWB trouble
Fusing section connector
disconnection
AC power trouble
Fusing unit not installed
Control PWB trouble
Fusing section connector
disconnection
AC power trouble
Fusing unit not installed
Check and
remedy
remedy
Check harnesses and connectors from
the thermistor to the control PWB.
Use SIM14 to clear the self diag
display.
the thermistor to the control PWB.
Use SIM14 to clear the self diag
display.
MAIN SUB
Details
H3
00···
HL1
01···
HL2
Content
Fusing section high temperature
trouble
trouble
Detail
The fusing temperature exceeds
242°C. (An input voltage of 0.27V or
above is detected.)
Fusing temperature control is started,
and 242°C is detected three or more
times continuously in sampling in the
specified interval. (Every 300msec)
242°C. (An input voltage of 0.27V or
above is detected.)
Fusing temperature control is started,
and 242°C is detected three or more
times continuously in sampling in the
specified interval. (Every 300msec)
Cause
Thermistor trouble
Control PWB trouble
Fusing section connector
disconnection
AC power trouble
Control PWB trouble
Fusing section connector
disconnection
AC power trouble
Check and
remedy
remedy
Use SIM5-2 to check the heater lamp
Blinking operation.
Blinking operation.
If the heater lamp blinks normally:
Check the thermistor and its
harness.
Check the thermistor input circuit in
the control PWB.
Check the thermistor and its
harness.
Check the thermistor input circuit in
the control PWB.
If the heater lamp keep lighting:
Check the AC PWB and the lamp
control circuit in the control PWB.
Use SIM14 to cancel the trouble
control circuit in the control PWB.
Use SIM14 to cancel the trouble
H4
00···
HL1
01···
HL2
Content
Fusing section low temperature trouble
Detail
The set temperature is not reached
within the specified time (3 min) after
turning on the power relay, or the
temperature does not reach 80°C
within 80 sec.
When the heater lamp is not turned off
in the specified time (3 min) from
starting warm-up, or the temperature
does not reach 80°C within 80 sec.
After completion of warm-up operation,
a temperature 50°C lower than the
temperature control level is detected 5
times continuously in sampling in the
specified interval. (every 300msec)
within the specified time (3 min) after
turning on the power relay, or the
temperature does not reach 80°C
within 80 sec.
When the heater lamp is not turned off
in the specified time (3 min) from
starting warm-up, or the temperature
does not reach 80°C within 80 sec.
After completion of warm-up operation,
a temperature 50°C lower than the
temperature control level is detected 5
times continuously in sampling in the
specified interval. (every 300msec)
Cause
Thermistor trouble
Heater lamp trouble
Control PWB trouble
Thermostat trouble
AC power trouble
Interlock switch trouble
Heater lamp trouble
Control PWB trouble
Thermostat trouble
AC power trouble
Interlock switch trouble
Check and
remedy
remedy
Use SIM5-2 to check the heater lamp
Blinking operation.
Blinking operation.
If the heater lamp blinks normally:
Check the thermistor and its
harness.
Check the thermistor input circuit in
the control PWB.
Check the thermistor and its
harness.
Check the thermistor input circuit in
the control PWB.
If the heater lamp does not light:
Check for heater lamp disconnection
and thermostat disconnection.
Check the interlock switch.
Check the AC PWB and the lamp
control circuit in the control PWB.
Use SIM14 to cancel the trouble.
and thermostat disconnection.
Check the interlock switch.
Check the AC PWB and the lamp
control circuit in the control PWB.
Use SIM14 to cancel the trouble.
MAIN SUB
Details
MX-M350/M450 N/U TROUBLE CODES 11 - 10
H5
01
Content
5-time continuous POD1 not-reaching
jam detection
jam detection
Detail
5-time continuous POD1 not-reaching
jam detection
jam detection
Cause
A fusing section jam is not properly
removed. (Jam paper remains.)
POD1 sensor trouble, or harness
disconnection
Improper installation of fusing unit
removed. (Jam paper remains.)
POD1 sensor trouble, or harness
disconnection
Improper installation of fusing unit
Check and
remedy
remedy
Check jam paper in the fusing section.
(winding, etc.)
Check POD1 sensor harness, and
check the fusing unit installation.
Use SIM14 to cancel the trouble.
(winding, etc.)
Check POD1 sensor harness, and
check the fusing unit installation.
Use SIM14 to cancel the trouble.
L1
00
Content
Scanner feed trouble
Details
Scanner feed is not completed within
the specified time.
the specified time.
Cause
Scanner unit abnormality
Scanner wire disconnection
Scanner wire disconnection
Check &
Remedy
Remedy
Check scanning with SIM 1-1.
L3
00
Content
Scanner return trouble
Details
Scanner return is not completed within
the specified time.
the specified time.
Cause
Scanner unit abnormality
Scanner wire disconnection
Scanner wire disconnection
Check &
Remedy
Remedy
Check scanning with SIM 1-1.
L4
01
Content
Main motor lock detection
Detail
The motor lock signal is detected for
1.5sec during rotation of the main
motor.
1.5sec during rotation of the main
motor.
Cause
main motor trouble
Check connection of harness between
the PCU PWB and the main motor.
Control circuit trouble
Check connection of harness between
the PCU PWB and the main motor.
Control circuit trouble
Check and
remedy
remedy
Use SIM25-1 to check the main motor
operation.
Check harness and connector between
the PCU PWB and the main motor.
operation.
Check harness and connector between
the PCU PWB and the main motor.
02
Content
Drum motor lock detection
Detail
The motor lock signal is detected for
1.5sec during rotation of the drum
motor.
1.5sec during rotation of the drum
motor.
Cause
Drum motor trouble
Improper connection of harness
between the PCU PWB and the drum
motor.
Control circuit trouble
Improper connection of harness
between the PCU PWB and the drum
motor.
Control circuit trouble
Check and
remedy
remedy
Use SIM6-1 to check the drum motor
operation.
Check harness and connector between
the PCU PWB and the drum motor.
operation.
Check harness and connector between
the PCU PWB and the drum motor.
MAIN SUB
Details
L4
30
Content
Controller fan motor lock detection
Detail
The motor lock signal is detected
during rotation of the controller fan
motor.
The motor lock signal is detected
during rotation of the HDD fan motor.
during rotation of the controller fan
motor.
The motor lock signal is detected
during rotation of the HDD fan motor.
Cause
Fan motor trouble
Improper connection of the harness
between the controller PWB and the
fan motor.
Control circuit trouble
Improper connection of the harness
between the controller PWB and the
fan motor.
Control circuit trouble
Check and
remedy
remedy
Use SIM 6-2 to check the fan motor
operation.
Check the harness and the connector
between the controller PWB and the
fan motor.
operation.
Check the harness and the connector
between the controller PWB and the
fan motor.
L6
10
Content
Polygon motor lock detection
Detail
It is judged that the polygon motor lock
signal is not outputted.
Lock signal is checked in the interval of
10sec after starting the polygon motor,
and it is judged that the polygon motor
does not rotate normally.
signal is not outputted.
Lock signal is checked in the interval of
10sec after starting the polygon motor,
and it is judged that the polygon motor
does not rotate normally.
Cause
The LSU connector or harness in the
LSU is disconnected or broken.
Polygon motor trouble
LSU is disconnected or broken.
Polygon motor trouble
Check and
remedy
remedy
Use SIM61-1 to check the polygon
motor operation.
Check connector and harness
connection.
Replace LSU.
motor operation.
Check connector and harness
connection.
Replace LSU.
L8
01
Content
No fullwave signal
Detail
Full wave signal is not detected.
Cause
The PCU PWB connector or the power
unit harness is disconnected or broken.
PCU PWB trouble
12V power source trouble
unit harness is disconnected or broken.
PCU PWB trouble
12V power source trouble
Check and
remedy
remedy
Check connection of the harness and
connector.
Replace PCU PWB.
Replace the power unit.
Replace the controller connection
mother board.
connector.
Replace PCU PWB.
Replace the power unit.
Replace the controller connection
mother board.
02
Content
Full wave signal width abnormality
Detail
It is judged as full wave signal
frequency abnormality.
(When the detection cycle is judged as
69Hz or above or 42.5Hz or below)
frequency abnormality.
(When the detection cycle is judged as
69Hz or above or 42.5Hz or below)
Cause
The connector or harness of the PCU
PWB and the power PWB is
disconnected.
PCU PWB trouble
Power unit trouble
PWB and the power PWB is
disconnected.
PCU PWB trouble
Power unit trouble
Check and
remedy
remedy
Check connection of the harness and
connector.
Replace the PCU PWB.
Replace the power unit.
connector.
Replace the PCU PWB.
Replace the power unit.
MAIN SUB
Details
MX-M350/M450 N/U TROUBLE CODES 11 - 11
U1
01
Content
FAX battery abnormality
Detail
FAX backup SRAM battery voltage fall
Cause
Battery life
Battery circuit abnormality
Battery circuit abnormality
Check and
remedy
remedy
Check that the battery voltage is about
2.5V or above.
Check the battery circuit.
2.5V or above.
Check the battery circuit.
02
Content
RTC read abnormality
(common with FAX, on ICU PWB)
(common with FAX, on ICU PWB)
Details
The value read from RTC on ICU PWB
is [EE]h (abnormal).
is [EE]h (abnormal).
Cause
RTC circuit abnormality
Battery voltage fall
Battery circuit abnormality
Battery voltage fall
Battery circuit abnormality
Check &
Remedy
Remedy
Set the time again with key operation,
and check that time advances properly.
Check RTC circuit.
Check that battery voltage is about
2.5V or above.
Check battery circuit.
and check that time advances properly.
Check RTC circuit.
Check that battery voltage is about
2.5V or above.
Check battery circuit.
U2
00
Content
EEPROM read/write error (ICU)
Detail
EEPROM write error
Cause
EEPROM trouble
EEPROM is not initialized.
ICU PWB EEPROM access circuit
trouble
EEPROM is not initialized.
ICU PWB EEPROM access circuit
trouble
Check and
remedy
remedy
Check that EEPROM is properly
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
U2
11
Content
Counter check sum error (ICU)
Detail
Counter data area check sum error
Cause
EEPROM trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit
trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit
trouble
Check and
remedy
remedy
Check that EEPROM is properly
inserted.
Save the counter/adjustment values
with the DIAG simulation.
Use DIAG (SIM16) to cancel U2
trouble.
Replace the ICU PWB.
inserted.
Save the counter/adjustment values
with the DIAG simulation.
Use DIAG (SIM16) to cancel U2
trouble.
Replace the ICU PWB.
12
Content
Adjustment value check sum error
(ICU)
(ICU)
Detail
Adjustment data area check sum error
Cause
EEPROM trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit
trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit
trouble
Check and
remedy
remedy
Check that EEPROM is properly
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
MAIN SUB
Details
U2
22
Content
SRAM memory check sum error (ICU)
Detail
MFPC section SRAM memory check
sum error
sum error
Cause
SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Check and
remedy
remedy
Initialize the communication
management table registered in the
SRAM and the FAX soft switch.
Since the registered data are deleted,
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
management table registered in the
SRAM and the FAX soft switch.
Since the registered data are deleted,
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
23
Content
SRAM memory individual data check
sum error (ICU)
sum error (ICU)
Detail
Check sum error for every data in the
SRAM memory of the MFPC section
(Communication management table,
sender registration data, etc.)
SRAM memory of the MFPC section
(Communication management table,
sender registration data, etc.)
Cause
SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Check and
remedy
remedy
Automatically initialize the data related
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted,
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted,
register the data again.
Use SIM16 to cancel U2 trouble.
Replace the ICU PWB.
U2
50
Content
HD section individual data check sum
error (ICU)
error (ICU)
Detail
Check sum error for every individual
data in HD of the MFPC section (One-
touch, Group, Program, etc.)
data in HD of the MFPC section (One-
touch, Group, Program, etc.)
Cause
HDD write/read error
Control circuit runaway due to noises
ICU PWB HD access circuit trouble
Control circuit runaway due to noises
ICU PWB HD access circuit trouble
Check and
remedy
remedy
Automatically initialize the data related
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted,
register the data again.
Use SIM 16 to cancel the U2 trouble.
Replace the HD PWB.
Replace the ICU PWB.
to the check sum error by turning OFF/
ON the power.
Since the registered data are deleted,
register the data again.
Use SIM 16 to cancel the U2 trouble.
Replace the HD PWB.
Replace the ICU PWB.
80
Content
EEPROM read/write error (Scanner)
Details
Scanner EEPROM write error
Cause
EEPROM abnormality
Scanner PWB EEPROM access circuit
abnormality
Scanner PWB EEPROM access circuit
abnormality
Check &
Remedy
Remedy
Check that EEPROM is set properly.
Record counter/adjustment values with
the simulation to protect the data from
being deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.
Record counter/adjustment values with
the simulation to protect the data from
being deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.
MAIN SUB
Details
MX-M350/M450 N/U TROUBLE CODES 11 - 12
U2
81
Content
Memory check sum error (Scanner)
Details
Scanner memory check sum error
Cause
EEPROM trouble
EEPROM which is not initialized is
installed.
Control circuit freeze by noises
Scanner PWB EEPROM access circuit
trouble
EEPROM which is not initialized is
installed.
Control circuit freeze by noises
Scanner PWB EEPROM access circuit
trouble
Check &
Remedy
Remedy
Check that EEPROM is set properly.
Record counter/adjustment values with
the simulation to protect the data from
being deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.
Record counter/adjustment values with
the simulation to protect the data from
being deleted.
Cancel U2 trouble with SIM 16.
Replace scanner PWB.
90
Content
EEPROM read/write error (PCU)
Detail
PCU EEPROM write error
Cause
EEPROM trouble
PCU PWB EEPROM access circuit
trouble
PCU PWB EEPROM access circuit
trouble
Check and
remedy
remedy
Check that EEPROM is properly
inserted.
Record counter/adjustment values with
the simulation to protect the data from
being deleted.
Use SIM16 to cancel U2 trouble.
Replace the Controller PWB.
inserted.
Record counter/adjustment values with
the simulation to protect the data from
being deleted.
Use SIM16 to cancel U2 trouble.
Replace the Controller PWB.
91
Content
Memory check sum error (PCU)
Detail
PCU memory check sum error
Cause
EEPROM trouble
EEPROM which is not initialized is
installed.
EEPROM is not initialized.
PCU PWB EEPROM access circuit
trouble
Hang of control circuit due to noises
EEPROM which is not initialized is
installed.
EEPROM is not initialized.
PCU PWB EEPROM access circuit
trouble
Hang of control circuit due to noises
Check and
remedy
remedy
Check that EEPROM is properly
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the Controller PWB.
inserted.
Save the counter/adjustment values
with the simulation.
Use SIM16 to cancel U2 trouble.
Replace the Controller PWB.
U6
00
Content
Desk/LCC communication trouble
Detail
Desk/LCC communication error
Communication cable test error after
turning on the power or exiting SIM.
Communication cable test error after
turning on the power or exiting SIM.
Cause
Improper connection or disconnection
of connector and harness
Desk control PWB trouble
Control PWB (PCU) trouble
Noise or interference
of connector and harness
Desk control PWB trouble
Control PWB (PCU) trouble
Noise or interference
Check and
remedy
remedy
Canceled by turning OFF/ON the
power.
Check connection of the harness and
connector in the communication line.
power.
Check connection of the harness and
connector in the communication line.
01
Content
Desk/LCC No. 1 tray lift-up trouble
Detail
Desk/LCC No. 1 tray lift-up trouble
Cause
Sensor trouble
Tray trouble
Defective connection or disconnection
between the PWB and the motor.
Desk control PWB trouble
Lift-up motor trouble
Tray trouble
Defective connection or disconnection
between the PWB and the motor.
Desk control PWB trouble
Lift-up motor trouble
Check and
remedy
remedy
Use SIM4-2 to check the upper limit
sensor detection.
Use SIM4-3 to check the lift-up motor
operation.
sensor detection.
Use SIM4-3 to check the lift-up motor
operation.
MAIN SUB
Details
U6
02
Content
Desk No. 2 tray/LCC1 lift-up trouble
Detail
Desk No. 2 tray/LCC lift-up trouble
Cause
Sensor trouble
Tray trouble
Defective connection or disconnection
between the PWB and the motor.
Desk control PWB trouble
Lift-up motor trouble
Tray trouble
Defective connection or disconnection
between the PWB and the motor.
Desk control PWB trouble
Lift-up motor trouble
Check and
remedy
remedy
Use SIM4-2 to check the upper limit
sensor detection.
Use SIM4-3 to check the lift-up motor
operation.
sensor detection.
Use SIM4-3 to check the lift-up motor
operation.
03
Content
Desk No. 3 tray/LCC2 lift-up trouble
Detail
Desk no. 3 tray lift-up trouble
Cause
Sensor trouble
Tray trouble
Defective connection or disconnection
between the PWB and the motor.
Desk control PWB trouble
Lift-up motor trouble
Tray trouble
Defective connection or disconnection
between the PWB and the motor.
Desk control PWB trouble
Lift-up motor trouble
Check and
remedy
remedy
Use SIM4-2 to check the upper limit
sensor detection.
Use SIM4-3 to check the lift-up motor
operation.
sensor detection.
Use SIM4-3 to check the lift-up motor
operation.
10
Content
Desk/LCC transport motor trouble
Detail
Desk/LCC transport motor operation
trouble
trouble
Cause
Motor lock
Drive abnormality
Defective connection or disconnection
between the PWB and the motor.
Motor rpm abnormality
Overcurrent to the motor
Desk control PWB trouble
Drive abnormality
Defective connection or disconnection
between the PWB and the motor.
Motor rpm abnormality
Overcurrent to the motor
Desk control PWB trouble
Check and
remedy
remedy
Use SIM4-3 to check the transport
motor operation.
motor operation.
U7
00
Content
RIC communication trouble
Detail
RIC communication trouble
Communication cable test error after
turning on the power or exiting SIM.
Communication cable test error after
turning on the power or exiting SIM.
Cause
Disconnection of connector and
harness
RTC control PWB trouble
Control PWB (ICU) trouble
Noise or interference
harness
RTC control PWB trouble
Control PWB (ICU) trouble
Noise or interference
Check and
remedy
remedy
Canceled by turning OFF/ON the
power.
Check connector and harness in the
communication line.
power.
Check connector and harness in the
communication line.
EE
EL
Content
Auto developer adjustment trouble
(Over-toner)
(Over-toner)
Detail
The toner concentration output is
detected as 1.5V or below in the auto
development adjustment.
detected as 1.5V or below in the auto
development adjustment.
Cause
Toner concentration sensor trouble
Charging voltage, developing voltage
abnormality
Insufficient toner concentration
Developing unit trouble
PCU PWB trouble
Charging voltage, developing voltage
abnormality
Insufficient toner concentration
Developing unit trouble
PCU PWB trouble
Check and
remedy
remedy
Use SIM25-2 to perform auto developer
adjustment.
adjustment.
MAIN SUB
Details
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