Read Sharp MX-1800N (serv.man16) Service Manual online
MX-1800N SELF DIAG AND TROUBLE CODE 8 – 19
F3-12
Main unit tray 1 lift-up trouble
F3-22
Main unit tray 2 lift-up trouble
H2-00
Non-contact thermistor detection
thermistor open (TH_UM_AD2)
thermistor open (TH_UM_AD2)
H2-01
Lower thermistor open (TH_LM)
H2-02
Sub thermistor open (TH_US)
H2-03
Non-contact thermistor
compensation thermistor open
(TH_UM_AD1)
compensation thermistor open
(TH_UM_AD1)
H3-00
Fusing section high temperature
trouble (TH_UM)
trouble (TH_UM)
H3-01
Fusing section high temperature
trouble (TH_LM)
trouble (TH_LM)
Trouble content
LUD1 does not turn ON within the specified time.
Section
PCU
Case 1
Cause
LUD1 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 LUD1.
Case 2
Cause
Tray 1 lift-up motor trouble
Check and
remedy
remedy
Check the lift-up unit.
Trouble content
LUD2 does not turn ON within the specified time.
Section
PCU
Case 1
Cause
LUD2 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 LUD2.
Case 2
Cause
Tray 2 lift-up motor trouble
Check and
remedy
remedy
Check the lift-up unit.
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.
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.
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