Cutter Motor Control Circuit - Printronix L5535 Maintenance Manual

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position), confirming that the motor is in the reference position. Then the

firmware outputs 100 more pulses, to move the transfer unit to its lower limit.

After this initialization, whenever the mechanism control firmware needs to

raise or lower the transfer unit, it outputs 100 pulses, then verifies the position

of the transfer unit by checking the upper or lower limit sensor.

Cutter Motor Control Circuit

The cutter motor control circuit is an H bridge structure. Each vertical leg of

the H bridge is composed of a PNP transistor and an NPN transistor, as

shown below:

Cutter Motor Control Circuit