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9.2.34 Print Head
Adjustment
1.
2.
3.
4.
5.
6.
7.
Remove the printer cover (9.2.1).
Move the print head to the center of the
printer.
Remove the print head cover
rl
and lay the
cover and ribbon to the right.
I nstall the platen and rotate it so that the
midpoint between the two setscrews that
hold the right hand platen knob points
straight up.
Position the print head so that the ends of
the wires are 0.012 inch to 0.014 inch
(0.30 mm to 0.35 mm) from the platen as
follows:
a. Loosen the hold down stud
II
and screw
m
on the right of the print head.
b. Set the copy control dial
D
on zero.
c. Place a 0.014 inch (0.35 mm) feeler gauge
between the platen and print head wires
m
d. Position the print head in the center of
the printer and push the head lightly
toward the platen.
e. Tighten the hold down screw and stud.
Check the adjustment and readjust if necessary.
Reinstall the print head, cover, and the
printer cover (9.2.1).
Removal
I
DANGER
The print head may be very hot after continued
use. Always allow the head to cool before re-
moving it.
1.
2.
3.
4.
Turn power off at the operator control panel.
Remove the printer cover (9.2.1).
For new print head installation, saturate the
two felt washers on the right bar, the bronze
block, and rear slide points on the left bar
with IBM No.6 oil.
For installation, adjust the print head.
9-40
5.
For installation, push the print head in and
3.
Snap out the flat bronze spring
II
between
the platen pressure roll shafts.
6.
7.
8.
out of the forms loading position to ensure
the head retracts properly.
Unthread the ribbon from the print head
and its cover, and lay the ribbon to the
right.
Open the ribbon feed rolls
II
and remove
the print head cover
rJ.
Unplug the print head cable from EC3
13.
9.
To the right of the print head, remove the
screw
m
and hold down stud
Ii
that
hold the bronze tabs.
10.
To the left of the print head, remove the
screw
D
that holds the bronze block.
11.
Remove the oil resevoir cover and pull
the oil wick from the felt reservoir
~.
For installation, if there is no oil in the
felt, add I BM No.6 oil and check that the
wick touches all eight print wires
ID.
12.
Lift off the print head.
13.
For installation, tilt the tip of the head
down so that it will slide under the print
head forms guide.
14.
To reinstall the print head, reverse this
procedure.
9.2.35 Print Head Forms Guide
Removal
The print head forms guide should be as far as
possible from the platen and centered within
the limits of the mounting slots.
1.
Turn power off at the operator control
panel.
2.
Remove the forms tractor unit and printer
covers.
4.
5.
6.
Spread the pressure roll arms and move the
end of the left roll shaft
m
away from the
platen area.
Remove the guide mounting screws
m
and
remove the guide.
Install the new guide with the screws loose.
7.
Center the guide in the mounting slots and
tighten the screws.
8.
Complete the operation by reversing steps
1 through 4.
9.2.35.1 Print Head Retract Ramp
Adjustment
Adjust the retract ramp so that when the print head
is at the left side frame, there is 0.095 inch ± 0.005
inch (2.41 mm ± 0.13 mm) between the print head
housing and the copy control dial.
1.
2.
3.
4.
5.
6.
Loosen the two retract ramp mounting screws
(on the left side frame), move the ramp as far
toward the front of the machine as possible,
and tighten the screws for a snug fit.
Set the copy control dial to
O.
Move the print head to the left side frame.
Insert the code plate aligning tool, PIN 460028,
between the copy control dial and the print
head housingll (on page 9-39).
Tap gently on the retract ramp to move it
toward the rear of the machine until the
code plate aligning tool is snug between
the copy control dial and the print head
housing
II
(on page 9-39).
Tighten the retract ramp mounting screws.
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