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Model
MX-6240N MX-7040N (serv.man26)
Pages
69
Size
603.72 KB
Type
PDF
Document
Service Manual
Brand
Device
Copying Equipment / Section 7 Troubleshooting - Updated November 2012
File
mx-6240n-mx-7040n-sm26.pdf
Date
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MX-7040N  TROUBLESHOOTING  7 – 53
 
UE-16
LCT1  warm  air  outlet port thermistor
low temperature
 
UE-17
LCT1  warm  air  outlet port thermistor
high temperature
 
UE-20
LCT2 suction fan motor trouble
 
UE-21
LCT2 exhaust fan motor trouble
 
UE-22
LCT2 warm air heater thermistor open
 
UE-23
LCT2  warm  air  heater th ermistor  low
temperature trouble
 
UE-24
LCT2 warm air heater thermistor high
temperature trouble
 
UE-25
LCT2  warm air outlet port thermistor
open
Trouble content
The temperature does not reach the specified level 
within the specified time after turning ON the power 
relay.
Detail
PCU
Cause
Thermistor trouble.
Warm air heater trouble
Warm air heater harness and connector connection 
trouble
A3 2-stage LCT control PWB trouble
Thermostat trouble.
AC power trouble
Insertion detection switch 2 trouble
Heater relay PWB trouble
Check & Remedy
Check the thermistor and its harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check for disconnection of the warm air heater and 
the thermostat.
Check the insertion detection switch 2.
Check the heater relay PWB.
Check the heater control circuit of the AC PWB and 
that of the A3 2-stage LCT control PWB.
Trouble content
The temperature at the warm air outlet port exceeds 
the specified level.
Detail
PCU
Cause
Thermistor trouble.
Warm air heater harness and connector connection 
trouble
Heater relay PWB trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Check the thermistor and its harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check the heater relay PWB.
Check the heater control circuit of the A3 2-stage LCT 
control PWB.
Trouble content
Suction fan motor abnormality
Detail
PCU
Cause
Motor lock
Motor RPM abnormality
Overcurrent to the motor
Harness and connector connection trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Use SIM04-03 to check the operation of the suction 
fan motor.
Check connection of the harness and the connector.
Replace the A3 2-stage LCT controller PWB.
Trouble content
Exhaust fan motor abnormality
Detail
PCU
Cause
Motor lock
Motor RPM abnormality
Overcurrent to the motor
Harness and connector connection trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Use SIM04-03 to check the operation of the exhaust 
fan motor.
Check connection of the harness and the connector.
Replace the A3 2-stage LCT control PWB.
Trouble content
The thermistor is open.
Detail
PCU
Cause
Warm air heater (thermistor) trouble
A3 2-stage LCT control PWB trouble
Warm air heater harness and connector connection 
trouble
Check & Remedy
Check the harness and the connector from the warm 
air heater (thermistor) to the A3 2-stage LCT control 
PWB.
Trouble content
The temperature does not reach the specified level 
within the specified time after turning ON the power 
relay.
Detail
PCU
Cause
Warm air heater (thermistor) trouble
Warm air heater trouble
Warm air heater harness and connector connection 
trouble
A3 2-stage LCT control PWB trouble
Thermostat trouble.
AC power trouble
Insertion detection switch 2 trouble
Heater relay PWB trouble
Check & Remedy
Check the warm air heater (thermistor) and its 
harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check for disconnection of the warm air heater and 
the thermostat.
Check the insertion detection switch 2.
Check the heater relay PWB.
Check the heater control circuit of the AC PWB and 
that of the A3 2-stage LCT control PWB.
Trouble content
The warm air heater temperature exceeds the 
specified level.
Detail
PCU
Cause
Warm air heater (thermistor) trouble
A3 2-stage LCT control PWB trouble
Warm air heater harness and connector connection 
trouble
Heater relay PWB trouble
Check & Remedy
Check the warm air heater (thermistor) and its 
harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check the heater relay PWB.
Check the heater control circuit of the A3 2-stage LCT 
control PWB.
Trouble content
The thermistor is open.
Detail
PCU
Cause
Thermistor trouble.
A3 2-stage LCT control PWB trouble
Connector connection trouble
Check & Remedy
Check connection of the harness and the connector 
from the thermistor to the A3 2-stage LCT control 
PWB.
MX-7040N  TROUBLESHOOTING  7 – 54
 
UE-26
LCT2  warm  air  outlet port thermistor
low temperature
 
UE-27
LCT2  warm  air  outlet port thermistor
high temperature
 
UE-30
LCT3 suction fan motor trouble
 
UE-31
LCT3 exhaust fan motor trouble
 
UE-32
LCT3 warm air heater thermistor open
 
UE-33
LCT3  warm  air  heater th ermistor  low
temperature trouble
 
UE-34
LCT3 warm air heater thermistor high
temperature trouble
 
UE-35
LCT3  warm air outlet port thermistor
open
Trouble content
The temperature does not reach the specified level 
within the specified time after turning ON the power 
relay.
Detail
PCU
Cause
Thermistor trouble.
Warm air heater trouble
Warm air heater harness and connector connection 
trouble
A3 2-stage LCT control PWB trouble
Thermostat trouble.
AC power trouble
Insertion detection switch 2 trouble
Heater relay PWB trouble
Check & Remedy
Check the thermistor and its harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check for disconnection of the warm air heater and 
the thermostat.
Check the insertion detection switch 2.
Check the heater relay PWB.
Check the heater control circuit of the AC PWB and 
that of the A3 2-stage LCT control PWB.
Trouble content
The temperature at the warm air outlet port exceeds 
the specified level.
Detail
PCU
Cause
Thermistor trouble.
Warm air heater harness and connector connection 
trouble
Heater relay PWB trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Check the thermistor and its harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check the heater relay PWB.
Check the heater control circuit of the A3 2-stage LCT 
control PWB.
Trouble content
Suction fan motor abnormality
Detail
PCU
Cause
Motor lock
Motor RPM abnormality
Overcurrent to the motor
Harness and connector connection trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Use SIM04-03 to check the operation of the suction 
fan motor.
Check connection of the harness and the connector.
Replace the A3 2-stage LCT control PWB.
Trouble content
Exhaust fan motor abnormality
Detail
PCU
Cause
Motor lock
Motor RPM abnormality
Overcurrent to the motor
Harness and connector connection trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Use SIM04-03 to check the operation of the exhaust 
fan motor.
Check connection of the harness and the connector.
Replace the A3 2-stage LCT control PWB.
Trouble content
The thermistor is open.
Detail
PCU
Cause
Warm air heater (thermistor) trouble
A3 2-stage LCT control PWB trouble
Warm air heater harness and connector connection 
trouble
Check & Remedy
Check the harness and the connector from the warm 
air heater (thermistor) to the A3 2-stage LCT control 
PWB.
Trouble content
The temperature does not reach the specified level 
within the specified time after turning ON the power 
relay.
Detail
PCU
Cause
Warm air heater (thermistor) trouble
Warm air heater trouble
Warm air heater harness and connector connection 
trouble
A3 2-stage LCT control PWB trouble
Thermostat trouble.
AC power trouble
Insertion detection switch 2 trouble
Heater relay PWB trouble
Check & Remedy
Check the warm air heater (thermistor) and its 
harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check for disconnection of the warm air heater and 
the thermostat.
Check the insertion detection switch 2.
Check the heater relay PWB.
Check the heater control circuit of the AC PWB and 
that of the A3 2-stage LCT control PWB.
Trouble content
The warm air heater temperature exceeds the 
specified level.
Detail
PCU
Cause
Warm air heater (thermistor) trouble
A3 2-stage LCT control PWB trouble
Warm air heater harness and connector connection 
trouble
Heater relay PWB trouble
Check & Remedy
Check the warm air heater (thermistor) and its 
harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check the heater relay PWB.
Check the heater control circuit of the A3 2-stage LCT 
control PWB.
Trouble content
The thermistor is open.
Detail
PCU
Cause
Thermistor trouble.
A3 2-stage LCT control PWB trouble
Connector connection trouble
Check & Remedy
Check connection of the harness and the connector 
from the thermistor to the A3 2-stage LCT control 
PWB.
MX-7040N  TROUBLESHOOTING  7 – 55
 
UE-36
LCT3  warm  air  outlet port thermistor
low temperature
 
UE-37
LCT3  warm  air  outlet port thermistor
high temperature
 
UE-40
LCT4 suction fan motor trouble
 
UE-41
LCT4 exhaust fan motor trouble
 
UE-42
LCT4 warm air heater thermistor open
 
UE-43
LCT4  warm  air  heater th ermistor  low
temperature trouble
 
UE-44
LCT4 warm air heater thermistor high
temperature trouble
 
UE-45
LCT4  warm air outlet port thermistor
open
Trouble content
The temperature does not reach the specified level 
within the specified time after turning ON the power 
relay.
Detail
PCU
Cause
Thermistor trouble.
Warm air heater trouble
Warm air heater harness and connector connection 
trouble
A3 2-stage LCT control PWB trouble
Thermostat trouble.
AC power trouble
Insertion detection switch 2 trouble
Heater relay PWB trouble
Check & Remedy
Check the thermistor and its harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check for disconnection of the warm air heater and 
the thermostat.
Check the insertion detection switch 2.
Check the heater relay PWB.
Check the heater control circuit of the AC PWB and 
that of the A3 2-stage LCT control PWB.
Trouble content
The temperature at the warm air outlet port exceeds 
the specified level.
Detail
PCU
Cause
Thermistor trouble.
Warm air heater harness and connector connection 
trouble
Heater relay PWB trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Check the thermistor and its harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check the heater relay PWB.
Check the heater control circuit of the A3 2-stage LCT 
control PWB.
Trouble content
Suction fan motor abnormality
Detail
PCU
Cause
Motor lock
Motor RPM abnormality
Overcurrent to the motor
Harness and connector connection trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Use SIM04-03 to check the operation of the suction 
fan motor.
Check connection of the harness and the connector.
Replace the A3 2-stage LCT controller PWB.
Trouble content
Exhaust fan motor abnormality
Detail
PCU
Cause
Motor lock
Motor RPM abnormality
Overcurrent to the motor
Harness and connector connection trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Use SIM04-03 to check the operation of the exhaust 
fan motor.
Check connection of the harness and the connector.
Replace the A3 2-stage LCT controller PWB.
Trouble content
The thermistor is open.
Detail
PCU
Cause
Warm air heater (thermistor) trouble
A3 2-stage LCT control PWB trouble
Warm air heater harness and connector connection 
trouble
Check & Remedy
Check the harness and the connector from the warm 
air heater (thermistor) to the A3 2-stage LCT control 
PWB.
Trouble content
The temperature does not reach the specified level 
within the specified time after turning ON the power 
relay.
Detail
PCU
Cause
Warm air heater (thermistor) trouble
Warm air heater trouble
Warm air heater harness and connector connection 
trouble
A3 2-stage LCT control PWB trouble
Thermostat trouble.
AC power trouble
Insertion detection switch 2 trouble
Heater relay PWB trouble
Check & Remedy
Check the warm air heater (thermistor) and its 
harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check for disconnection of the warm air heater and 
the thermostat.
Check the insertion detection switch 2.
Check the heater relay PWB.
Check the heater control circuit of the AC PWB and 
that of the A3 2-stage LCT control PWB.
Trouble content
The warm air heater temperature exceeds the 
specified level.
Detail
PCU
Cause
Warm air heater (thermistor) trouble
A3 2-stage LCT control PWB trouble
Warm air heater harness and connector connection 
trouble
Heater relay PWB trouble
Check & Remedy
Check the warm air heater (thermistor) and its 
harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check the heater relay PWB.
Check the heater control circuit of the A3 2-stage LCT 
control PWB.
Trouble content
The thermistor is open.
Detail
PCU
Cause
Thermistor trouble.
A3 2-stage LCT control PWB trouble
Connector connection trouble
Check & Remedy
Check connection of the harness and the connector 
from the thermistor to the A3 2-stage LCT control 
PWB.
MX-7040N  TROUBLESHOOTING  7 – 56
 
UE-46
LCT4  warm  air  outlet port thermistor
low temperature
 
UE-47
LCT4  warm  air  outlet port thermistor
high temperature
Trouble content
The temperature does not reach the specified level 
within the specified time after turning ON the power 
relay.
Detail
PCU
Cause
Thermistor trouble.
Warm air heater trouble
Warm air heater harness and connector connection 
trouble
A3 2-stage LCT control PWB trouble
Thermostat trouble.
AC power trouble
Insertion detection switch 2 trouble
Heater relay PWB trouble
Check & Remedy
Check the thermistor and its harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check for disconnection of the warm air heater and 
the thermostat.
Check the insertion detection switch 2.
Check the heater relay PWB.
Check the heater control circuit of the AC PWB and 
that of the A3 2-stage LCT control PWB.
Trouble content
The temperature at the warm air outlet port exceeds 
the specified level.
Detail
PCU
Cause
Thermistor trouble.
Warm air heater harness and connector connection 
trouble
Heater relay PWB trouble
A3 2-stage LCT control PWB trouble
Check & Remedy
Check the thermistor and its harness.
Check the thermistor input circuit section of the A3 2-
stage LCT control PWB.
Check the heater relay PWB.
Check the heater control circuit of the A3 2-stage LCT 
control PWB.
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