C9148-90909 5 Theory of operation 61
Scanner controller board
The scanner controller board controls the operation of flatbed and ADF components used in the
following scanning processes: document transportation, document exposure, and imaging.
When the copy processor board sends the scan commands to the scanner controller board, the
scanner controller board sends signals to the motors, solenoids, scanning lamp, and CCD driver
PCB.
The scanner controller board controls the operation of the following components:
● ADF document transportation
• ADF sensors (door-open, document-detect, and leading-edge sensors)
• ADF solenoid
• ADF drive motor
● document exposure
• optical-unit home-position sensor
• scanning lamp
• scanning motor
● imaging process
• CCD driver PCB (converts reflected light to a digital RGB signal)
• copy processor communication
● flatbed intake fan (off in PowerSave mode, half-speed when idle; full-speed when scanning)
ADF motor circuit
The ADF motor circuit controls the operation of the ADF motor. The ADF motor is a +24 vdc
stepping motor. It rotates in a counterclockwise direction. The ADF motor is not fault-protected.
Note When a fault-protected motor circuit fails, an error message appears on the control panel. The
ADF motor circuit is not fault protected. No error message appears on the control-panel display
if this circuit fails.
Optical-unit motor circuit
The optical unit motor circuit controls the optical unit motor and the movement of the unit. The
optical unit motor is a +24 vdc stepping motor. It rotates in both a clockwise and
counterclockwise direction. If the optical unit motor fails, the message 30.1.17 SCAN FAILURE
appears on the control-panel display.
Scan-unit intake-fan motor circuit
The fan motor circuit controls the fan speed. The fan is off in PowerSave mode, it rotates at half-
speed when the product is idle, and at full-speed during the scanning process, when a document
is detected in the ADF, or when a control-panel button or key is pushed. If the fan motor fails, the
message 30.01.06 Scan Failure appears on the control panel-display.
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