January 2000 © TOSHIBA TEC 4 - 23 FC-22 TROUBLESHOOTING
▼▼
4.1.11 Scanner related service call
C27 Carriage home position sensor not turning OFF within a fixed time
C28 Carriage home position sensor not turning ON within a fixed time
Remove the original glass, move the carriage to the paper feed side, turn ON the power
switch, and then proceed to check the following items.
C27 Is the carriage stuck at a point other than the home position?
Check the SCM and SDV boards for any abnormal circuit.
1. Check if any connector pin is disconnected, or any harness is open- or short-
circuited.
2. Check the scan motor drive pulley if its screws are loose.
3. Check if any conductor pattern on the SDV board is open- or short-circuited.
4. Check if any conductor pattern on the SCM board is open- or short-circuited.
5. Replace the SDV board.
6. Replace the SCM board.
C28 Does the carriage, after arriving at its home position, make a big noise?
Since the carriage home position sensor has not been turned ON,
1. Check if the sensor connector is disconnected.
2. Check the SDV and SCM boards for any abnormal circuit.
Since the carriage has been stopped at its home position but does not move,
1. Check if any connector pin is disconnected, or any harness is open- or short-
circuited.
2. Check if any conductor pattern on the SDV board is open- or short-circuited.
3. Check if any conductor pattern on the SCM board is open- or short-circuited.
4. Replace the SDV board.
5. Replace the SCM board.
▼
▼
NO YES
YES
NO