Gestetner B147, Service Manual

Page: 234 / 1081

SC TABLE
B147/B149/B190 4-32 SM
SC No. Item Definition Possible Cause
Related
SCs
Troubleshooting Procedure Type
SC 672 Controller-to-
operation panel
communication
error at startup
• After the machine is
powered on, the
communication between the
controller and the operation
panel is not established, or
communication with
controller is interrupted after
a normal startup.
• After startup reset of the
operation panel, the
attention code or the
attention acknowledge code
is not sent from the
controller.
• After the controller issues a
command to check the
communication line with the
controller at 30-second
intervals, the controller fails
to respond twice.
• Controller stalled
• Controller board
installed incorrectly
• Controller board
defective
• Operation panel
connector loose or
defective
• The controller is not
completely shutdown
when you turn the
main switch off.
1. Turn the main switch off and on.
2. Check the condition of the controller
board.
3. Check the condition of the operation
panel.
4. Replace the controller board.
5. Replace the operation panel.
6. Turn the main switch off, wait for one
second or more, and turn the main
switch on.
CTL
SC 680 BCU/ MUSIC
communication
error
After the engine CPU sends a
message, the Music CPU does
not respond within five
seconds three consecutive
times. •
Toner cartridge
memory chip loose
connection
• Memory chip problem
• Memory chip cable
wiring problem
1. Turn the main switch off and on.
2. Check if the toner cartridge is
installed correctly.
3. Replace the toner cartridge.
4. Check if the harnesses are not
damaged.
5. Replace the BCU.
D
SC 685 SBU-IPU
communication
error
•
During data transfer, a
checksum error occurs.
•
During any operation except
initialization, the SBU sends
a hardware-reset
acknowledgement to the
IPU.
•
Loose connection
between SBU and
IPU
• SBU board defective
•
IPU board defective
•
External noise
1. Turn the main switch off and on.
2. Shut out the external noise.
3. Check the cable connection of the
scanner unit.
4. Replace the SBU board.
5. Replace the IPU board.
D