HP PageWriter XL M1705B Service Manual page 209

Table A-2. Printhead Lo! ic Connector J2
GROUND 1
Signal
5VREF
nLATCH
nPSTB
PDOUT
PRCLK
Definition
Reference voltage from the pulse width monitor
(PWM) in the +5 volt supply. Valid when the
cardiograph is On.
Printhead latch-latches a line of print data.
Printhead strobe-enables the dot drivers.
Print data output to printhead.
Printhead clock. Clocks serial data into printhead at
4 MHz.
VTHERM Voltage from printhead thermistor-indicates
printhead temperature.
Connector Pin Assignments A-3