Gestetner G060, Service Manual

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SC TABLE
G570 4-28 SM
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 553 Pressure roller
fusing lamp
overheat The detected pressure roller
temperature stays at 200°C
or more for five seconds.
•
Defective PSU
•
Defective BCU
1. Replace the fusing unit.
2. Replace the PSU.
3. Replace the BCU. A
SC 554 Pressure roller
fusing lamp low
temperature
error During stand-by mode or
printing, the detected
pressure roller temperature
stays at 50°C or less for five
seconds.
•
Loose connection
between the fusing
unit and the machine
•
Defective pressure
roller thermistor
•
Defective PSU
•
Defective BCU
1. Check the connection between the
fusing unit and main frame.
2. Replace the fusing unit.
3. Replace the PSU.
4. 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 100
consecutive seconds.
•
Pressure roller
thermistor out of
position
1. Replace the fusing unit. A
SC 556 Pressure roller
fusing lamp
temperature
fluctuation The pressure roller
temperature changes by
±
20°C or more in one
second. This occurs three
times in one minute or two
consecutive times.
•
Loose connection of
the pressure roller
thermistor
•
Loose connection
between the fusing
unit and main frame
1. Check if the fusing unit is properly set
and connected to the main frame.
2. Check if the pressure roller thermistor
connector is firmly connected.
3. Replace the fusing unit.
A
SC 560 Zero cross error When the main switch is
turned on, the machine
checks how many zero-
cross signals are generated
during 500 ms. If the
number of zero-cross signal
generated is either more
than 66 or less than 45 and
when this condition is
detected 10 consecutive
times, this code is displayed.
•
Electrical noise in the
supply from the
power cord
1. Replace the PSU. A