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Cutter Motor Control Circuit
As shown in Figure 3–29, the cutter motor control circuit has an H-bridge
configuration. Each vertical leg of the H-bridge is composed of one PNP and one
NPN transistor, as shown in Figure 3–29.
If CPS0 = 1 when ON/OFF = 1, and F/R (forward/reverse) = 1, Q
and Q
turn on,
1
4
and the motor rotates forward. The cutter that has moved to the front side is detected
by cutter sensor 0, and when CPS0 = 0, the motor stops. In the same way, if CPS1 =
1 when ON/OFF = 1 and F/R = 0, Q
and Q
turn on, and the motor rotates
2
3
backwards. The cutter that has moved to the rear side is detected by cutter sensor 1,
and when CPS1 = 0, the motor stops. In either case, when the motor stops, Q
and
3
Q
turn on, and the motor is stopped by short-circuiting.
4
Electrical System and Adjustments
3–51
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