Service manual

SC TABLE
SM 4-23 G130/G131
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 544 Heating roller
fusing lamp
high
temperature
error
During stand-by mode or a
print job, the detected heating
roller temperature stays at
230 °C or more for 0.2 second.
• Defective heating roller
thermistor
• Defective PSU
• Defective BCU
SC 543 1. Replace the fusing unit.
2. Replace the PSU.
3. Replace the BCU.
A
SC 545 Heating roller
fusing lamp
consecutive full
power
When the fusing unit is not
running in the Ready condition,
the heating roller fusing lamp
keeps on with full power for 35
consecutive seconds.
• Heating roller
thermistor out of
position
SC 555 1. Replace the fusing unit. A
SC 551 Pressure roller
thermistor error
The measured pressure roller
temperature does not reach
7°C for 60 seconds.
• Loose connection of
pressure roller
thermistor
• Defective pressure
roller thermistor
• Defective BCU
SC 541 1. Check that the pressure roller
thermistor is firmly connected.
2. Replace the fusing unit.
3. Replace the BCU.
A
SC 552 Pressure roller
warm-up error
After the main switch is turned
on or the door is closed, the
pressure roller temperature
does not reach the ready
temperature within 210
seconds during fusing unit
warm-up.
• Pressure roller fusing
lamp broken
• Defective pressure
roller thermistor
• Defective BCU
SC 542 1. Check if the pressure roller
thermistor is firmly connected.
2. Replace the fusing unit.
3. Replace the BCU.
A
SC 553 Pressure roller
fusing lamp
overheat
The detected pressure roller
temperature stays at 210°C or
more for five seconds.
• Defective PSU
• Defective BCU
SC 543 1. Replace the fusing unit.
2. Replace the PSU.
3. Replace the BCU.
A
SC 555 Pressure roller
fusing lamp
consecutive full
power
When the fusing unit is not
running in the Ready condition,
the pressure roller-fusing lamp
keeps ON with full power for
300 consecutive seconds.
• Pressure roller
thermistor out of
position
SC 545 1. Replace the fusing unit. A