Main Unit Tray 2 Lift-Up Trouble; Non-Contact Thermistor Detection Thermistor Open (Th_Um_Ad2); Lower Thermistor Open (Th_Lm); Sub Thermistor Open (Th_Us) - Sharp MX-2300 G Service Manual

F3-22

Main unit tray 2 lift-up trouble

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.
Check Check the harness and the connector of LUD2.
and
remedy
Case 2 Cause Tray 2 lift-up motor trouble
Check Check the lift-up unit.
and
remedy
H2-00 Non-contact thermistor detection
thermistor open (TH_UM_AD2)
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
Check Check the harness and the connector from the
and thermistor to the control PWB.
remedy
H2-01

Lower thermistor open (TH_LM)

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
Check Check the harness and the connector from the
and thermistor to the control PWB.
remedy
H2-02

Sub thermistor open (TH_US)

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
Check Check the harness and the connector from the
and thermistor to the control PWB.
remedy
H2-03 Non-contact thermistor
compensation thermistor open
(TH_UM_AD1)
Trouble content Thermistor open
Section PCU
Case 1 Cause Thermistor trouble, control PWB trouble, fusing
section connector connection trouble, AC power
source trouble
Check Check the harness and the connector from the
and thermistor to the control PWB.
remedy
MX-2300/2700 N/G SELF DIAG AND TROUBLE CODE 8 – 21
H3-00 Fusing section high temperature
trouble (TH_UM)
Trouble content The fusing temperature inside the PWB exceeds the
specified level.
Section PCU
Case 1 Cause Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power source
trouble
Check 1) Use SIM5-2 to check blinking of the heater lamp.
and 2) If it blinks normally, check the thermistor and the
remedy 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.
4) Use SIM14 to cancel the trouble.
H3-01 Fusing section high temperature trou-
ble (TH_LM)
Trouble content The fusing temperature inside the PWB exceeds the
specified level.
Section PCU
Case 1 Cause Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power source
trouble
Check 1) Use SIM5-2 to check blinking of the heater lamp.
and 2) If it blinks normally, check the thermistor and the
remedy 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.
4) Use SIM14 to cancel the trouble.
H3-02 Sub thermistor fusing section high
temperature trouble (TH_US)
Trouble content The fusing temperature inside the PWB exceeds the
specified level.
Section PCU
Case 1 Cause Thermistor trouble, control PWB trouble, fusing
section connector connection error, AC power source
trouble
Check 1) Use SIM5-2 to check blinking of the heater lamp.
and 2) If it blinks normally, check the thermistor and the
remedy 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.
4) Use SIM14 to cancel the trouble.