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Chapter 4. Theory
Functional Units
Power Supply
The power supply provides power to the logic/control
board, forms feed motor, print head carrier motor, and
the print head magnets. The ac power to the power
supply is controlled by a switch on the front of the
printer and a circuit breaker/switch in a distribution
box that contains the ac receptacle and line filters.
The power supply provides the ac and dc power used
within the unit; the supply uses a single-phase ac power
source to provide ac voltage to the fan, and the follow-
ing dc voltages: +5, + 11, and +24 Vdc.
Note: The model 02R (remote) has a -12 V dc
power supply for the EIA interface.
Forms Feed Emitter
The forms feed emitter consists of a disk, attached to
the forms feed/emitter motor shaft, that permits pulses
to be produced. The pulses are counted to determine
how far the motor moves, and are used in a feedback
loop to keep the motor running.
Print Emitter and Print Emitter Pickup
The print emitter and print emitter pickup are used by
the printer to generate the left margin signal and the
print emitter signals.
The printer emitter pickup is mounted on the bottom of
the print head carrier and slides along the length of the
stationary print emitter as the carrier moves left or
right.
The logic/control board monitors and counts emitter
pulses to determine:
•
The direction the print head is moving
•
How far the print head is from the left margin
•
When to activate the print wire magnets.
Theory
4-1
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