d-Color MF4003/MF3303
L TROUBLESHOOTING > 3. TROUBLE CODE
L-37
Trouble isolation -
Relevant electrical parts • Fusing unit
• C3722: Heating roller thermistor/Edg (TH1)
• C3725: Heating roller temperature sensor (TEMS)
• C3726: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Procedure
1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. Replace DCPS.
3.9.4C3731
Contents
Trouble type C3731: Fusing abnormally high temperature detection (hard protector)
Rank A
Trouble detection condition The hard protector signal malfunction is detected for a predetermined continuous period of time or more.
Trouble isolation -
Relevant electrical parts • Fusing unit
• Heating roller thermistor/Edg (TH1)
• Heating roller temperature sensor (TEMS)
• Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Procedure
1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. Replace DCPS.
3.9.5C3825, C3826
Contents
Trouble type • C3825: Fusing abnormally low temperature detection (Main of the heating roller)
• C3826: Fusing abnormally low temperature detection (Center of the heating roller)
Rank A
Trouble detection condition • C3825: The heating roller temperature sensor (TEMS) continues to detect a temperature lower than a
predetermined one for a predetermined period of time.
• C3826: The heating roller thermistor/Ctr (TH2) continues to detect a temperature lower than a predetermined
one for a predetermined period of time.
Trouble isolation -
Relevant electrical parts • Fusing unit
• C3825: Heating roller temperature sensor (TEMS)
• C3826: Heating roller thermistor/Ctr (TH2)
• DC power supply (DCPS)
• CPU board (CPUB)
• Base board (BASEB)
Procedure
1. Check the fusing unit for correct installation (whether it is secured in position).
2. Check the open/close operation of the right door.
3. Check the connector between the fusing unit-relay CN3-BASEB CN10E for proper connection and correct as necessary.
4. Check the connector between the fusing unit-relay CN2-DCPS CN2 for proper connection and correct as necessary.
5. Check CPUB for proper installation and correct as necessary.
6. Replace the fusing unit.
7. Replace CPUB.
8. Replace BASEB.
9. DCPS F102 or FU181 conduction check.
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