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January 2000 © TOSHIBA TEC 4 - 37 FC-22 TROUBLESHOOTING
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4.1.16 Other service calls
C94 Main-CPU abnormal
Is "Call for service" displayed again even after the copier is turned OFF and then back ON?
Observe the condition for a while.
1. Check if the conductor pattern between Main CPU (IC84) and MROM (IC56) is open- or
short-circuited.
2. If this problem recurs frequently, replace the LGC board.
C9A Main memory abnormal
Is "Call for service" displayed again even after the copier is turned OFF and then back ON?
Observe the condition for a while.
1. Check if the conductor pattern between the main CPU (IC84), MROM (IC56), SRAM (IC41,
IC42) and BC-RAM (IC55) is open- or short-circuited.
2. If this problem recurs frequently, replace the LGC board.
C9E IMC board connection abnormal
Is "Call for service" displayed again even after the copier is turned OFF and then back ON?
Observe the condition for a while.
1. Check if the IMC board and the SIC board are firmly connected to the MTH board.
2.
Check the IMC board if the connectors J168, J162, J169, J165, J166 or J161 is disconnected.
3. Check the SIC board if the connector J182 is disconnected.
4. Check the SCM board if the connector J1 is disconnected.
5. Check if the harness connected to the IMC board is open- or short-circuited or if any con-
nector pin is disconnected.
6. Check if the harness between the SCM and SIC boards is open-circuited or if any connector
pin is disconnected.
7. If this problem recurs frequently, replace the IMC board.
YES
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