Sharp AR-650, Service Handbook

Page: 135 / 200

4 - 7 TROUBLE SHOOTING
4.5 ADF Related Service Call
[C72] Error of aligning sensor adjustment
(1) Check between the aligning sensor and the reflection mirror for foreign objects, and the reflec-
tion mirror for dirt.
(2) Check the harness between the aligning sensor and the LGC board for open-circuit.
(3) Check mainly IC4, IC5 and CN6 on the LGC board for open-or short-circuits.
(4) Replace the aligning sensor.
(5) Replace the LGC board.
(6) Initialize the ADF EEPROM, and perform automatic sensor adjustment.
[C73] EEPROM initializing error
(1) Check mainly IC1 on the LGC board for open-or short-circuits.
(2) Replace the LGC board.
(3) Initialize the ADF EEPROM, and perform automatic sensor adjustment.
[C74] Error of exit sensor adjustment
(1) Check between the exit sensor and the reflection mirror for foreign objects, and the reflection
mirror for dirt.
(2) Check the harness between the exit sensor and the LGC board for open-circuit.
(3) Check mainly IC4, IC5 and CN7 on the LGC board for open-or short-circuits.
(4) Replace the exit sensor.
(5) Replace the LGC board.
(6) Initialize the ADF EEPROM, and perform automatic sensor adjustment.
[C76] Transmission time-out error
[C77] Transmission buffer full
[C78] ADF power ON I/F error
[C79] Reception time-out error
(1) Check the harness between the ADF control PC board and the scanner control PC board for
disconnections or open-circuits.
(2) Check mainly the IC2, IC3, IC14, CN1 on the ADF control PC board for open-or short-circuits.
(3) Check mainly the IC1, IC7, J8 on the scanner control PC board for open-or short-circuits.
(4) Replace the ADF control PC board.
(5) Replace the scanner control PC board (SLG board).
[C80] Error of timing sensor adjustment
(1) Check between the timing sensor and the reflection mirror for foreign objects, and the reflection
mirror for dirt.
(2) Check the harness between the timing sensor and the LGC board for open-circuit.
(3) Check mainly IC4, IC5 and CN6 on the LGC board for open-or short-circuits.
(4) Replace the timing sensor.
(5) Replace the LGC board.
(6) Initialize the ADF EEPROM, and perform automatic sensor adjustment.