HP PageWriter XL M1705B Service Manual page 210

Table A-3. Printer Motor and Sensor Connector J3
Signal
DETECTOR
DOOR
Definition
EMITTER
Pl-P4
Paper sensor detector.
Indicates the state of the printer compartment door.
High when door closed.
Paper sensor emitter.
Drive signals for the printer's four-phase stepper
motor.
VPRINT
Switched battery voltage to the printhead. Enabled
with +5READY signal.
VMOTOR
Power to the motor. Enabled with +5READY signal.
A-4 Connector Pin Assignments