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MX-M350N MX-M350U MX-M450N MX-M450U (serv.man8)
Pages
15
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202.95 KB
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PDF
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Service Manual
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Device
Copying Equipment / Trouble Codes
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mx-m350n-mx-m350u-mx-m450n-mx-m450u-sm8.pdf
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Sharp MX-M350N / MX-M350U / MX-M450N / MX-M450U (serv.man8) Service Manual ▷ View online

MX-M350/M450 N/U  TROUBLE CODES  11 - 8
F2
39
Content
Process thermistor trouble
Detail
Output value abnormality of the 
temperature sensor of temperature/
humidity sensor 
Cause
Temperature/humidity sensor 
abnormality
Temperature/humidity sensor harness 
connection failure
PCU PWB trouble
Check and 
remedy
Check connection of the harness and 
the connector of the temperature/
humidity sensor.
Replace the temperature/humidity 
sensor.
Check PCU PWB.
58
Content
Process humidity sensor breakdown
Detail
Process humidity sensor open or short
Cause
Temperature/humidity sensor harness 
connection failure
Temperature/humidity sensor 
abnormality
PCU PWB trouble
Check and 
remedy
Check connection of the harness and 
the connector of the temperature/
humidity sensor. 
Replace the temperature/humidity 
sensor.
Check PCU PWB.
F3
12
Content
Machine no. 1 tray lift-up trouble
Detail
LUD does not turn ON in the specified 
time.
Cause
LUD trouble
No. 1 tray lift-up trouble
Check connection of harness between 
the PCVU PWB, lift-up unit, and paper 
feed unit.
Check and 
remedy
Check LUD, and their harness and 
connectors.
Check the lift-up unit. 
F3
22
Content
Machine tray 2 lift-up trouble
Detail
MCLUD does not turn ON in the 
specified time.
Cause
MCLUD trouble
No. 2 tray lift-up motor trouble
Harness disconnection f the PCU 
PWB, the lift-up unit, and the paper 
feed unit.
Check and 
remedy
Check MCLUD, and their harness and 
connectors. 
Check the lift-up unit. 
F6
00
Content
Communication trouble (ICU detection) 
between ICU and FAX
Details
Communication establishment error/
Fleming/Parity/Protocol error
Cause
Slave unit PWB connector 
disconnection
Harness abnormality between slave 
unit PWB and ICU PWB.
Slave unit PWB mother board 
connector pin breakage
Slave unit ROM abnormality/No ROM/
Reverse insertion of ROM/ROM pin 
breakable
Check & 
Remedy
Check connector harness between 
slave unit PWB and ICU PWB.
Check grounding of machine.
Check slave unit PWB ROM.
MAIN SUB
Details
F6
01
Content
FAX expansion flash memory 
abnormality (ICU detection)
Details
Flash memory cannot be deleted.
Cause
Flash memory cannot be deleted.
Check & 
Remedy
Check the FAX image storage Flash 
memory.
Use SIM 66-10 to clear the flash 
memory.
04
Content
FAX modem operation abnormality
Details
FAX PWB modem chip operation 
abnormality
Cause
Modem chip operation abnormality in 
FAX PWB
Check & 
Remedy
Replace FAX PWB.
20
Content
FAX write protect cancel
Detail
The write protect JP is released.
Cause
The write protect JP is set to “write 
allow.”
FAX interface PWB trouble
FAX PWB trouble
Check and 
remedy
Check the write protect JP.
Replace the FAX PWB. Replace the 
FAX interface PWB.
21
Content
Combination abnormality of the TEL/
LIU PWB and the FAX soft switch
Detail
Combination abnormality of the TEL/
LIU PWB and the FAX PWB 
information (soft switch)
Or the TEL/LIU PWB is not a new one 
for new MDMC PWB.
Cause
The destination of the installed TEL/LIU 
PWB differs.
The FAX PWB information (soft switch) 
differs.
TEL/LIU PWB trouble
Check and 
remedy
Check the destination of the TEL/LIU 
PWB.
Check the FAX PWB information (soft 
switch).
Replace the TEL/LIU PWB.
97
Content
FAX-BOX skating trouble
The FAX-BOX PWB is not one for the 
AR-FX12. (FAX detection)
Detail
The FAX-BOX MODEM controller is not 
one for the AR-FX12. 
Cause
The FAX-BOX Modem controller PWB 
information (hard detection) is not for 
the AR-FX12. (The Modem controller 
PWB for the AR-FX5 or the AR-FX6 is 
used.)
Check and 
remedy
Check the FAX-BOX modem controller 
PWB.
Replace it with a modem controller 
PWB for the AR-FX12.
MAIN SUB
Details
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
Detail
Combination error of the FAX-BOX 
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).
Check and 
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.
F7
01
Content
FAX board EEPROM read/write error
Details
EEPROM access error (read/write)
Cause
EEPROM trouble
FAX PWB EEPROM access circuit 
trouble
Check & 
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.
H2
00···
HL1
01···
HL2
Content
Thermistor open
Fusing unit not installed
Detail
Thermistor is open. 
(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
Check and 
remedy
Check harnesses and connectors from 
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
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) 
Cause
Thermistor trouble
Control PWB trouble
Fusing section connector 
disconnection
AC power trouble
Check and 
remedy
Use SIM5-2 to check the heater lamp
Blinking operation.
If the heater lamp blinks normally:
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
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)
Cause
Thermistor trouble
Heater lamp trouble
Control PWB trouble
Thermostat trouble
AC power trouble
Interlock switch trouble
Check and 
remedy
Use SIM5-2 to check the heater lamp
Blinking operation.
If the heater lamp blinks normally:
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.
MAIN SUB
Details
MX-M350/M450 N/U  TROUBLE CODES  11 - 10
H5
01
Content
5-time continuous POD1 not-reaching 
jam detection
Detail
5-time continuous POD1 not-reaching 
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
Check and 
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.
L1
00
Content
Scanner feed trouble
Details
Scanner feed is not completed within 
the specified time.
Cause
Scanner unit abnormality
Scanner wire disconnection
Check & 
Remedy
Check scanning with SIM 1-1.
L3
00
Content
Scanner return trouble
Details
Scanner return is not completed within 
the specified time.
Cause
Scanner unit abnormality
Scanner wire disconnection
Check & 
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.
Cause
main motor trouble
Check connection of harness between 
the PCU PWB and the main motor. 
Control circuit trouble
Check and 
remedy
Use SIM25-1 to check 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.
Cause
Drum motor trouble
Improper connection of harness 
between the PCU PWB and the drum 
motor.
Control circuit trouble
Check and 
remedy
Use SIM6-1 to check 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.
Cause
Fan motor trouble
Improper connection of the harness 
between the controller PWB and the 
fan motor.
Control circuit trouble
Check and 
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.
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.
Cause
The LSU connector or harness in the 
LSU is disconnected or broken.
Polygon motor trouble
Check and 
remedy
Use SIM61-1 to check the polygon 
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
Check and 
remedy
Check connection of the harness and 
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)
Cause
The connector or harness of the PCU 
PWB and the power PWB is 
disconnected.
PCU PWB trouble
Power unit trouble
Check and 
remedy
Check connection of the harness and 
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
Check and 
remedy
Check that the battery voltage is about 
2.5V or above.
Check the battery circuit. 
02
Content
RTC read abnormality 
(common with FAX, on ICU PWB)
Details
The value read from RTC on ICU PWB 
is [EE]h (abnormal).
Cause
RTC circuit abnormality
Battery voltage fall
Battery circuit abnormality
Check & 
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. 
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
Check and 
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.
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
Check and 
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.
12
Content
Adjustment value check sum error 
(ICU)
Detail
Adjustment data area check sum error
Cause
EEPROM trouble
Control circuit trouble by noise
ICU PWB EEPROM access circuit 
trouble
Check and 
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.
MAIN SUB
Details
U2
22
Content
SRAM memory check sum error (ICU)
Detail
MFPC section SRAM memory check 
sum error
Cause
SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Check and 
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.
23
Content
SRAM memory individual data check 
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.)
Cause
SRAM trouble
Control circuit runaway due to noises
ICU PWB SRAM access circuit trouble
Check and 
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.
U2
50
Content
HD section individual data check sum 
error (ICU)
Detail
Check sum error for every individual 
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
Check and 
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.
80
Content
EEPROM read/write error (Scanner)
Details
Scanner EEPROM write error
Cause
EEPROM abnormality
Scanner PWB EEPROM access circuit 
abnormality
Check & 
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.
MAIN SUB
Details
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