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February 2002 © TOSHIBA TEC 4 - 31 FC-210/310 TROUBLESHOOTING
4.1.14 Communications related service call
[C57] Communication error between LGC-CPU and IPC board
(1) Check if any conductor pattern on the LGC board, mainly around IC23, IC72, IC74 and J125,
is short- or open-circuited.
(2) Check if the conductor pattern on the IPC board is short- or open-circuited.
(3) Replace the IPC board.
(4) Replace the LGC board.
[C5A] Communications error between LGC-CPU and printer controller
<<For a built-in type printer controller>>
1. Check if the printer controller unit is securely mounted on the copier.
2. Check if the harness between the LGC and IMC boards is open-circuited, and if the connector
J113 on the LGC board and the connector J182 on the IMC board are disconnected.
3. Check if the harness between the switching power supply and the printer controller is open-
circuited.
4. Check if the connector J710 of the switching power supply is disconnected.
5. Check if any conductor pattern on the IMC, IMG, MTH2 and LGC boards is open- or short-
circuited .
6. Replace the LGC board.
7. Replace the IMG board.
8. Replace the IMC board.
9. Replace the MTH2 board.
<<For an external type printer controller>>
1. Check if the printer controller power is turned ON.
2. Check if the harness between the PIF board and the printer controller is open-circuited.
3. Check if the PIF board is firmly connected to the MTH2 board.
4. Check if the harness between the LGC and IMC boards is open-circuited, and if the connector
J113 on the LGC board and the connector J182 on the IMC board are disconnected.
5. Check if any conductor pattern on the PIF, IMG, MTH2, IMC and LGC boards is open- or
short-circuited.
6. Replace the PIF board.
7. Replace the LGC board.
8. Replace the IMG board.
9. Replace the IMC board.
10. Replace the MTH2 board.
[C5B] LGC-CPU signal transmission error to IMC-CPU
[C5C] LGC-CPU signal reception error from IMC-CPU
1. Check if the harness between the LGC and IMC boards is open-circuited, and if the
connector J113 on the LGC board and the connector J182 on the IMC board are
disconnected.
2. Replace the LGC board.
3. Replace the IMC board.