Full Cutter Motor Drive Circuit And Full Cutter Sensor Circuit; Half Cutter Motor Drive Circuit And Half Cutter Sensor Circuit - Brother PT-9200DX Service Manual

[1] Full Cutter Motor Drive Circuit and Full Cutter Sensor Circuit

The drive sequence of the full cutter motor is shown below.
The cutter stays at the home position in the normal state. (The full cutter
sensor input level is low.)
A tape cutting drive command rotates the DC motor clockwise to cut the tape.
At this time, the sensor input level switches from low to high. When this input
level switches to low again, it indicates that the cutter has returned to the home
position after cutting the tape.
When the low level of sensor input is detected, the DC motor brake is applied.
When the sensor input level switches to high again during braking, which
indicates that the cutter has passed by the home position, the DC motor
rotates counterclockwise. When the sensor input level switches to low again,
the motor brake is applied to monitor the sensor input level.
When the sensor input level switches to high, the DC motor rotates clockwise.
When it switches to low, the motor brake is applied.
If the sensor input level is low for 100 msec with the brake applied when the
above operations are repeated, the cutter is judged as returned to the home
position, completing the operations.
If an abnormal end shifts the cutter from the home position, the DC motor
rotates counterclockwise before printing to return the cutter to the home
position (initialization).
If the cutter remains at the home position 300 msec or does not return to the
home position 1000 msec after the DC motor starts rotating clockwise, it is
processed as an error.
The DC motor does not operate with the cover open, which is detected by the
cover open sensor.

[2] Half Cutter Motor Drive Circuit and Half Cutter Sensor Circuit

The cutter stays at the home position in the normal state. (The half cutter
sensor input level is low.)
A tape half cutting drive command rotates the DC motor clockwise (for 800
msec) for the half cutting of the tape. At this time, the sensor input level
switches from low to high. Then the DC motor rotates counterclockwise.
When the sensor input level switches to low again, the motor brake is applied.
If the sensor input level is low for 100 msec with the brake applied, the cutter is
judged as returned to the home position, completing the operations.
If the cutter remains at the home position with the DC motor rotating clockwise
or does not return to the home position 800 msec after the DC motor starts
rotating counterclockwise, it is processed as an error.
The DC motor does not operate with the cover open, which is detected by the
cover open sensor.
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