Gestetner B147 Service Manual page 993

Rev. 06/2004
⇒
SC No. Item
SC 555 Pressure roller
fusing lamp
consecutive full
power
SC 556 Pressure roller
fusing lamp
temperature
fluctuation
SC 560 Zero cross error
SC 620 ARDF
communication
error
SC 621 Two-tray
finisher/booklet
finisher
communication
error
Bank
SC 622
communication
error
SM
Definition
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.
The pressure roller
temperature changes by
±20°C or more in one second.
This occurs three times in one
minute or two consecutive
times.
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.
• After the ARDF is detected,
the break signal occurs or
communication timeout
occurs.
While the BCU communicates
with an optional unit, an SC
code is displayed if one of
following conditions occurs.
1. The BCU receives a signal
which is generated by the
peripherals only just after
the main switch is turned
Related
Possible Cause
SCs
• Pressure roller
thermistor out of
position
• Loose connection of
the pressure roller
thermistor
• Loose connection
between the fusing
unit and main frame
• Electrical noise in the
supply from the
power cord
• Incorrect installation
of ARDF
• ARDF defective
• IPU board defective
• External noise
• Cable problems
• BCU problems
• PSU problems in the
machine
• Main board problems
in the peripherals
4-29
Troubleshooting Procedure
1. Replace the fusing unit.
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.
1. Replace the PSU.
1. Turn the main switch off and on.
2. Check the cable connection of the
ARDF.
3. Shut out the external noise.
4. Replace the ARDF.
5. Replace the IPU board.
1. Turn the main switch off and on.
2. Check if the cables of peripherals are
properly connected.
3. Replace the PSU if no power is
supplied to peripherals.
4. Replace the BCU or main board of
peripherals.
SC TABLE
Type
A
A
A
D
D
B147/B149