Service manual

SC TABLE
G130/G131 4-24 SM
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
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
SC 621 Two-tray
finisher/booklet
finisher
communication
error
SC 622 Bank
communication
error
D
SC 623 Duplex unit
communication
error
While the BCU communicates
with an optional unit, an SC
code is displayed if one of
following conditions occurs.
1. The BCU receives the
break signal which is
generated by the peripherals
only just after the main
switch is turned on.
2. When the BCU does not
receive an OK signal from a
peripheral 100ms after
sending a command to it.
The BCU resends the
command. The BCU does
not receive an OK signal
after sending the command
3 times.
• Cable problems
• BCU problems
• PSU problems in the
machine
• Main board problems
in the peripherals
1. Turn the main switch off and on.
2. Check if the cables of peripherals are
correctly connected.
3. Replace the PSU if no power is
supplied to peripherals.
4. Replace the BCU or main board of
peripherals.
D