Gestetner B147 Service Manual page 234

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