Gestetner B147 Service Manual page 230

SC TABLE
SC No. Item
SC 544 Heating roller During stand-by mode or a
fusing lamp print job, the detected heating
high roller temperature stays at
temperature 210 °C or more for 0.2 second.
error
SC 545 Heating roller When the fusing unit is not
fusing lamp running in the Ready condition,
consecutive full the heating roller fusing lamp
power keeps on with full power for 30
consecutive seconds.
SC 546 Heating roller The heating roller temperature
fusing lamp
changes by ±20°C or more in
temperature
one second. This occurs three
fluctuation
times in one minute or two
consecutive times.
SC 551 Pressure roller The measured pressure roller
thermistor error temperature does not reach
7°C for 30 seconds.
SC 552 Pressure roller After the main switch is turned
warm-up error on or the door is closed, the
pressure roller temperature
does not reach the ready
temperature within 180
seconds during fusing unit
warm-up.
SC 553 Pressure roller The detected pressure roller
fusing lamp temperature stays at 210°C or
overheat more for five seconds.
B147/B149/B190
Definition Possible Cause
• Defective heating
roller thermistor
• Defective PSU
• Defective BCU
• Heating roller
thermistor out of
position
• Loose connection of
the thermistor
• Loose connection
between the fusing
unit and main frame
• Loose connection of
pressure roller
thermistor
• Defective pressure
roller thermistor
• Defective BCU
• Pressure roller fusing
lamp broken
• Defective pressure
roller thermistor
• Defective BCU
• Defective PSU
• Defective BCU
Related
Troubleshooting Procedure
SCs
1. Replace the fusing unit.
2. Replace the PSU.
3. Replace the BCU.
1. Replace the fusing unit.
1. Check if the fusing unit is properly set
and connected to the main frame.
2. Check if the heating roller thermistor
connector is firmly connected.
3. Replace the fusing unit.
1. Check that the pressure roller
thermistor is firmly connected.
2. Replace the fusing unit.
3. Replace the BCU.
1. Check if the pressure roller thermistor
is firmly connected.
2. Replace the fusing unit.
3. Replace the BCU.
1. Replace the fusing unit.
2. Replace the PSU.
3. Replace the BCU.
4-28
Type
A
A
A
A
A
A
SM