Motors and fans The scanner uses three dc stepping motors. Two of the stepping motors drive the ADF unit rollers, and the other stepping motor drives the flatbed optical unit: The flatbed motor rotates in one direction to drive the flatbed optical unit when scanning is from the glass. The flatbed motor rotates in the opposite direction to position the flatbed optical unit for scanning from the ADF frontside. The pickup motor rotates in one direction to rotate the pickup and feed rollers. The pickup motor rotates in the opposite direction to rotate the registration rollers. The delivery motor rotates the delivery rollers.
The three fans are for the ADF, the flatbed, and the power supply: The ADF fan assembly includes a fan housing. The ADF fan is an intake fan. Note The ADF fan can be ordered separately or with its plastic housing. The flatbed fan assembly includes a filter. The flatbed fan is an intake fan. Note The flatbed fan assembly filter only needs to be replaced when replacing the flatbed fan. The power supply fan is an exhaust fan. Delivery motor ADF fan Flatbed fan Pickup motor Power supply fan Flatbed motor Figure 40. Motors and fans 70 Chapter 5 Theory of operation C8523-90921