HP 8550 Service Manual - Page 280
Protecting the belt motor from overcurrent, Table 72.
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Table 72 shows the relationship between the belt motor drive signal (BMON), belt motor rotation direction signal (BDIR), belt motor rotation speed control signal (BMPWM), and the feeding belt. Table 72. Relationship between belt motor drive signal and the feeding belt Belt motor drive signal (BMON) 1 1 1 1 0 Belt motor rotation direction signal (BDIR) 1 1 0 0 1 / 0 Belt motor rotation speed control signal (BMPWM) Pulses 0 Pulses 0 1 / 0 Feeding Belt The feeding belt rotates in pick-up direction (counterclockwise). The feeding belt rotates by inertial in pickup direction (clockwise). The feeding belt rotates in copier mode delivery direction (clockwise). The feeding belt rotates by inertial in copier mode delivery direction (clockwise). The feeding belt stops. Protecting the belt motor from overcurrent At times, overcurrent can occur because of a specific type of original or state of the ADF. To protect the power supply circuit from extra loads occurring because of continuing overcurrent while the belt is rotating in pick-up direction, an overcurrent control circuit is provided. 278 Chapter - 5 Theory of operation EN