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4.5.5 Circuit Cards (285 Ipm)
Hammer Driver
The hammer driver cards (6) each contain 22
hammer drivers and predrivers. This card also
determines if an odd number of hammers is on
to develop the hammer check lines.
Motors/Solenoid Driver
This card contains the drivers for the carriage
motor and belt motor. This card also contains
solenoid drivers for the upper and lower paper
clamp solenoids, and the ribbon drive clutch
solenoid.
Control Card
This card contains digital logic for generating
belt up-to-speed, home pulse, and subscans.
Also included are the impression control single-
shot, the oscillators for the carriage advance
pulses and the voltage regulator that generates
the +8.5 voltage and +5 voltage for the printer.
B13
Board and Gate
A13
Board
Control
Card
Sense Ampl ifier Card,
for Forms Jam Detect
Hammer Drivers
2-44
46-88
Hammer Drivers
90-132
A23
Solenoid Drivers
Card
Casting
4-94
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