Ricoh FT8680 Service Manual page 367

31 July 1995
SC124 - Scanner Home Position Sensor Abnormal
Definition:
The main PCB cannot detect the scanner home position sensor output
change at the scanner position initialization and scanner start.
Points to check
•
Scanner home position sensor
•
Scanner drive pulley (Allen screws)
•
Scanner drive wires
•
Motor control PCB
•
Main PCB input (CN111-3)
SC125 - Scanner Speed Abnormal
Definition:
Scanner speed detected by the motor control PCB through the encoder
differs from a specified speed by more than 25%.
Points to check:
•
Mechanical interference with the scanner drive
•
Scanner drive motor and encoder
•
DC motor drive PCB
•
Motor control PCB
SC128 - Scanner Drive Motor Encoder Failure
Definition:
The motor control PCB detects no encoder pulse from the scanner drive
motor at scanner initialization and scanner start.
Points to check:
•
Scanner drive motor and encoder
•
Scanner home position sensor
•
DC motor drive PCB
•
Motor control PCB
SYSTEM ERROR AND SERVICE CALL CONDITIONS
6-5