Cutter Motor Control Circuit - Printronix L5000 Series Maintenance Manual

Cutter Motor Control Circuit

The cutter motor is controlled by an H bridge structure circuit using 2 elements each
of NPN and PNP transistors.
ON/OFF=1, F/R (forward / reverse) =1, and if CPSO=1 at this time, Q1 and Q4 turn
on, and the motor rotates forward. The cutter that has moved to the front side is
detected by cutter sensor 1,and if CPSO=1, the motor stops. In the same way, if
CPS1=1, Q2 and Q3 turn on, and the motor rotates backwards. The cutter that has
moved to the rear side is detected by cutter sensor 1, and if CPS1=0, the motor stops.
In either case, when the motor stops, Q3 and Q4 turn on, and the motor is stopped by
short–circuiting.
Electrical and Wire Data 6–51