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MX-5500N MX-6200N MX-7000N (serv.man47)
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33
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Service Manual
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Device
Copying Equipment / Self diagnostics Trouble Codes
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mx-5500n-mx-6200n-mx-7000n-sm47.pdf
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MX-7000N  SELF DIAG AND TROUBLE CODE  8 – 25
 
H4-00
Fusing section low temperature 
trouble (TH_UM_AD2)
 
H4-01
Fusing section low temperature 
trouble (TH_LM)
 
H4-02
Sub thermistor fusing section low
temperature trouble (TH_US)
 
H4-04
External heating thermistor fusing 
section low temperature trouble 
(TH_EX1)
 
H4-30
Detection thermistor input 
abnormality (TH_UM)
 
H5-01
5 continuous detection of POD1 not-
reached jam
Trouble content
The temperature does not reach the specified level 
within the specified time after turning on the power 
relay.
Section
PCU
Case 1
Cause
Thermistor trouble, heater lamp trouble, PCU PWB 
trouble, thermostat trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The temperature does not reach the specified level 
within the specified time after turning on the power 
relay.
Section
PCU
Case 1
Cause
Thermistor trouble, heater lamp trouble, PCU PWB 
trouble, thermostat trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
The temperature does not reach the specified level 
within the specified time after turning on the power 
relay.
Section
PCU
Case 1
Cause
Thermistor trouble, heater lamp trouble, PCU PWB 
trouble, thermostat trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
When the power relay is turned ON after supplying 
power, the set temperature is not reached within 
the specified time. 
Section
PCU
Case 1
Cause
Thermistor trouble, heater lamp trouble, PCU PWB 
trouble, thermostat trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
TH_UM_AD1 and TH_UM_AD2 do not exceed the 
specified level (50 count with the AD value) within 
5 minutes after HL_UM is turned on.
Section
PCU
Case 1
Cause
HL_UM does not turn on. Thermistor trouble, 
harness trouble, PCU PWB trouble
Check and 
remedy
1)
Use SIM5-2 to check blinking of the heater 
lamp.
2)
If it blinks normally, check the thermistor and 
the harness.
Check the PCU PWB thermistor input circuit 
section.
3)
If it is not lighted, check for the heater lamp 
disconnection and the thermostat breakage. 
Check the interlock switch. Check the AC 
PWB and the PCU PWB lamp control circuit.
4)
Use SIM14 to cancel the trouble.
Trouble content
5 continuous detection of POD1 not-reached jam
Section
PCU
Case 1
Cause
The fusing jam is not removed completely. (Jam 
paper remains.)
Check and 
remedy
Check the fusing section for jam paper. (winding, 
etc.)
Case 2
Cause
POD1 sensor trouble or harness connection 
trouble
Check and 
remedy
Check the POD1 sensor harness.
Use SIM14 to cancel the trouble.
Case 3
Cause
Fusing unit installation trouble
Check and 
remedy
Check the fusing unit installation.
MX-7000N  SELF DIAG AND TROUBLE CODE  8 – 26
 
H7-10
Low temperature detection during the
temperature control reset operation
after stopping the alarm in a JOB
(HL_UM)
 
H7-11
Low temperature detection during the
temperature control reset operation
after stopping the alarm in a JOB
(HL_LM)
 
H7-12
Low temperature detection during the
temperature control reset operation
after stopping the alarm in a JOB
(HL_US)
 
H7-14
Low temperature detection during the
temperature control reset operation
after stopping the alarm in a JOB
(HL_EX1)
 
L1-00
Mirror feed trouble
 
L3-00
Mirror return trouble
 
L4-02
Paper feed motor lock trouble
 
L4-03
Fusing motor lock trouble
Trouble content
When the alarm is stopped, the set temperature is 
not reached within the specified time.
* Alarm stop: When the fusing temperature falls 
below the specified level in a print JOB, printing 
is interrupted temporarily and the temperature is 
reset.
Section
PCU
Case 1
Cause
Connector and harness connection trouble
Check and 
remedy
Check connection of the connector and the 
harness.
Case 2
Cause
Thermistor trouble, thermostat trouble, heater lamp 
trouble, PCU PWB trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
Use SIM 5-2 to check lighting of the heater lamp. 
Check conduction of the thermostat. Replace the 
heater lamp, the PCU PWB, and the AC PWB.
Trouble content
When the alarm is stopped, the set temperature is 
not reached within the specified time.
* Alarm stop: When the fusing temperature falls 
below the specified level in a print JOB, printing 
is interrupted temporarily and the temperature is 
reset.
Section
PCU
Case 1
Cause
Connector and harness connection trouble
Check and 
remedy
Check connection of the connector and the 
harness.
Case 2
Cause
Thermistor trouble, thermostat trouble, heater lamp 
trouble, PCU PWB trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
Use SIM 5-2 to check lighting of the heater lamp. 
Check conduction of the thermostat. Replace the 
heater lamp, the PCU PWB, and the AC PWB.
Trouble content
When the alarm is stopped, the set temperature is 
not reached within the specified time.
* Alarm stop: When the fusing temperature falls 
below the specified level in a print JOB, printing 
is interrupted temporarily and the temperature is 
reset.
Section
PCU
Case 1
Cause
Connector and harness connection trouble
Check and 
remedy
Check connection of the connector and the 
harness.
Case 2
Cause
Thermistor trouble, thermostat trouble, heater lamp 
trouble, PCU PWB trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
Use SIM 5-2 to check lighting of the heater lamp. 
Check conduction of the thermostat. Replace the 
heater lamp, the PCU PWB, and the AC PWB.
Trouble content
When the alarm is stopped, the set temperature is 
not reached within the specified time.
* Alarm stop: When the fusing temperature falls 
below the specified level in a print JOB, printing 
is interrupted temporarily and the temperature is 
reset.
Section
PCU
Case 1
Cause
Connector and harness connection trouble
Check and 
remedy
Check connection of the connector and the 
harness.
Case 2
Cause
Thermistor trouble, thermostat trouble, heater lamp 
trouble, PCU PWB trouble, AC power source 
trouble, interlock switch trouble
Check and 
remedy
Use SIM 5-2 to check lighting of the heater lamp. 
Check conduction of the thermostat. Replace the 
heater lamp, the PCU PWB, and the AC PWB.
Trouble content
Mirror feed is not completed within the specified 
time.
Section
SCU
Case 1
Cause
Mirror unit trouble, mirror wire disengagement
Check and 
remedy
Use SIM1-1 to check the mirror operation.
Trouble content
Mirror return is not completed within the specified 
time.
Section
SCU
Case 1
Cause
Mirror unit trouble, mirror wire disengagement
Check and 
remedy
Use SIM1-1 to check the mirror operation.
Trouble content
When the paper feed motor is rotated in warming 
up or in canceling a jam and the lock signal is not 
detected within 1sec.
Section
PCU
Case 1
Cause
Paper feed motor trouble, harness connection 
trouble between PCU PWB and paper feed motor, 
control circuit trouble
Check and 
remedy
Use SIM6-1 to check the paper feed motor 
operation. Check the harness and the connector 
between the PCU PWB and the paper feed motor.
Trouble content
The motor lock signal is detected during rotation of 
the fusing motor.
Section
PCU
Case 1
Cause
Harness connection trouble between the PCU 
PWB and the fusing motor.
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fusing motor.
Case 2
Cause
Fusing motor trouble, control circuit trouble
Check and 
remedy
Use SIM6-1 to check the operation of the fusing 
motor.
MX-7000N  SELF DIAG AND TROUBLE CODE  8 – 27
 
L4-04
Developing motor trouble (BK)
 
L4-05
Developing motor trouble (CL)
 
L4-06
Transfer belt separation position 
sensor trouble
 
L4-08
Waste toner motor lock
 
L4-09
Resist motor lock
 
L4-12
Secondary transfer separation trouble
 
L4-13
Fusing external heating separation 
trouble
 
L4-30
Controller fan motor trouble
Trouble content
The motor lock signal is detected during rotation of 
the developing motor.
Section
PCU
Case 1
Cause
Harness connection trouble between the PCU 
PWB and the developing motor.
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the developing motor.
Case 2
Cause
Developing motor trouble, control circuit trouble
Check and 
remedy
Use SIM25-1 to check the operation of the 
developing motor.
Trouble content
The motor lock signal is detected during rotation of 
the developing motor.
Section
PCU
Case 1
Cause
Harness connection trouble between the PCU 
PWB and the developing motor.
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the developing motor.
Case 2
Cause
Developing motor trouble, control circuit trouble
Check and 
remedy
Use SIM25-1 to check the operation of the 
developing motor.
Trouble content
When separating the primary transfer belt unit, 
change in the separation position sensor 
characteristics is not detected within the specified 
time.
Section
PCU
Case 1
Cause
Harness connection trouble between the PCU 
PWB and the separation position sensor
Check and 
remedy
Check the harness between the PCU PWB and the 
separation position sensor.
Case 2
Cause
The belt position sensor is not interrupted or it is 
always interrupted. Belt separation clutch 
operation trouble
Check and 
remedy
Use SIM6-3 to check the belt separation operation.
Check to insure that the sensor is interrupted from 
lighting when the belt is separated.
Case 3
Cause
The primary transfer belt unit is not installed.
Check and 
remedy
Install the primary transfer belt unit.
Trouble content
The motor lock signal is detected during rotation of 
the waste toner motor.
Section
PCU
Case 1
Cause
Harness connection trouble between the PCU 
PWB and the waste toner motor.
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the waste toner motor.
Case 2
Cause
Waste toner motor trouble, control circuit trouble
Check and 
remedy
Use SIM6-1 to check the operation of the waste 
toner motor.
Trouble content
When the resist motor is rotation, the motor lock 
signal is detected.
Section
PCU
Case 1
Cause
Harness connection trouble between the PCU 
PWB and the resist motor
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the resist motor.
Case 2
Cause
Resist motor trouble, control circuit trouble
Check and 
remedy
Use SIM6-1 to check the operation of the resist 
motor.
Trouble content
When the secondary transfer unit is separated, the 
separation sensor status change is not detected 
within the specified time.
Section
PCU
Case 1
Cause
Connector and harness connection trouble
Check and 
remedy
Check connection of the connector and the 
harness.
Case 2
Cause
Separation mechanism trouble, separation motor 
trouble, separation sensor trouble
Check and 
remedy
Check the separation mechanism. Replace the 
separation motor and the separation sensor.
Case 3
Cause
PCU PWB trouble
Check and 
remedy
Replace the PCU PWB.
Trouble content
When the fusing external heating unit is separated, 
the separation sensor status change is not 
detected within the specified time.
Section
PCU
Case 1
Cause
Connector and harness connection trouble
Check and 
remedy
Check connection of the connector and the 
harness.
Case 2
Cause
Separation mechanism trouble, separation motor 
trouble, separation sensor trouble
Check and 
remedy
Check the separation mechanism. Replace the 
separation motor and the separation sensor. 
Case 3
Cause
PCU PWB trouble
Check and 
remedy
Replace the PCU PWB.
Trouble content
1)
The motor lock signal is detected during 
rotation of the controller fan motor.
2)
The motor lock signal is detected during 
rotation of the HDD fan motor.
Section
MFP
Case 1
Cause
Fan motor trouble
Check and 
remedy
Use SIM6-2 to check the operation of the fan 
motor.
Case 2
Cause
Harness connection trouble between the mother 
PWB and the fan motor.
Check and 
remedy
Check the harness and the connector between the 
mother PWB and the fan motor.
Case 3
Cause
Control circuit trouble
Check and 
remedy
Replace the MFPcnt PWB.
Case 4
Cause
Mother PWB trouble.
Check and 
remedy
Replace the mother PWB.
MX-7000N  SELF DIAG AND TROUBLE CODE  8 – 28
 
L4-31
Paper exit cooling fan F lock
 
L4-32
Power cooling fan 1 lock
 
L4-34
LSU cooling fan trouble
 
L4-35
Fusing exhaust fan lock
 
L4-36
Fusing suction fan lock
 
L4-37
Charger cooling fan lock
 
L4-38
Machine ventilation fan center lock
 
L4-39
Machine ventilation fan right lock
 
L4-40
Ozone fan 1 lock
 
L4-41
Ozone fan 2 lock
Trouble content
When the paper exit cooling fan F is operated, the 
fan operation signal is not detected within the 
specified time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble.
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
Trouble content
When the power cooling fan 1 is operated, the fan 
operation signal is not detected within the specified 
time.
Section
PCU
Case 1
Cause
Power cooling fan 1 connector disconnection
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
Trouble content
When the LSU cooling fan is operated, the fan 
operation signal is not detected within the specified 
time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and 
remedy
Check the harness and the connector between the 
LSU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
If the trouble is not canceled, replace the LSU fan 
and the LSU cnt PWB.
Trouble content
When the fusing exhaust fan is operated, the fan 
operation signal is not detected within the specified 
time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble.
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
Trouble content
When the fusing suction fan is operated, the fan 
operation signal is not detected within the specified 
time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble.
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
Trouble content
When the charger cooling fan is operated, the fan 
operation signal is not detected within the specified 
time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble.
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
Trouble content
When the machine ventilation fan center is 
operated, the fan operation signal is not detected 
within the specified time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble.
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
Trouble content
When the machine ventilation fan right is operated, 
the fan operation signal is not detected within the 
specified time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble.
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
Trouble content
When the ozone fan 1 is operated, the fan 
operation signal is not detected within the specified 
time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble.
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
Trouble content
When the ozone fan 2 is operated, the fan 
operation signal is not detected within the specified 
time.
Section
PCU
Case 1
Cause
Fan connector disconnection
Check and 
remedy
Check the harness and the connector between the 
PCU PWB and the fan.
Case 2
Cause
Fan does not rotate because of other trouble.
Check and 
remedy
Use SIM6-2 to check that the fan is actually 
rotating.
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