Adf Related Service Call - Toshiba DP4500 Service Handbook

5.1.12 ADF related service call

[C71] ADF feed motor is abnormal
(1) Check if the load on the motor shaft is normal.
(2) Check the mechanical load and adjust the drive system. Remove foreign objects.
(3) Check if the power is supplied to connector CN11 of the motor.
(4) Check the circuits and connectors on the ADF control board, mainly IC6, Q19, Q20, Q21, Q22 and
CN11, for short- and open-circuits.
(5) Replace the ADF control board.
(6) Replace the ADF feed motor.
[C73] EEPROM initialization error
(1) Check the ADF control board, mainly IC12, for short- and open-circuits.
(2) Replace the ADF control board.
(3) Initialize the EEPROM and perform the automatic sensor adjustment of the ADF.
[C74] Reverse sensor adjustment error
(1) Check if there is any foreign object between the reverse sensor and reflecting mirror. Check if the
reflecting mirror is dirty.
(2) Check if the harness connecting the reverse sensor and ADF control board is open-circuited.
(3) Check the circuits and connectors on the ADF control board, mainly IC3, IC4 and CN4, for short- and
open-circuits.
(4) Replace the reverse sensor.
(5) Replace the ADF control board.
(6) Initialize the EEPROM and perform the automatic sensor adjustment of the ADF.
[C81] Fan motor is abnormal
(1) Check if the load on the motor shaft is normal.
(2) Remove foreign objects.
(3) Check if the harness connecting the fan motor and ADF control board is open-circuited.
(4) Check if the power is supplied to the pin 1 of the CN9 on the ADF control board during the operation.
(5) Check the circuits and connectors on the ADF control board, mainly Q12 and Q16, for open-and short-
circuits.
(6) Replace the ADF control board.
(7) Replace the fan motor.
December 2000 © TOSHIBA TEC 5 - 63 DP4500/3500 TROUBLESHOOTING