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Print Head
160
PRINT HEAD
Service Check
1.
Remove the printer covers (110).
2.
Center the print head on the platen.
3.
Remove the print head cover (2 screws) and place
the' cover and ribbon to the right.
4.
Turn the platen so that the center point between
the 2 setscrews that hold the right-hand Platen
knob points straight up.
5.
Set the Copy Control dial
II
to
O.
6.
Check that the ends of the print wires are 0.30
mm to 0.35 mm (0.012 inch to 0.014 inch)
II
from the platen; adjust if needed.
Adjustment
1.
Perform steps 1, 2, 3, and 4 of the service check;
then return to step 2 of this procedure.
2.
Position the print head so that the ends of the
wires are 0.30 mm to 0.35 mm (0.012 inch to
0.014 inch) from the platen as follows:
a. Loosen the hold-down
IE
and screw
II
on the
right of the print head.
b. Set the Copy Control dial
II
to
O.
c. Place a 0.35 mm (0.014 inch) thickness gauge
between the platen and print head wires
d. Position the print head in the center of the
platen and push the head lightly toward the
platen.
e.
Tig~ten
the hold-down
IE
and screw
II·
3.
Check the adjustment and adjust again if needed.
4.
Reinstall the print head cover and tighten the
ribbon.
5.
Install the printer covers (110).
1-44
Removal 'and Replacement
DANGER
The print head may be very hot after continued use.
Always let the head cool before removing it.
1.
Power off.
2.
Remove the printer cover (110).
3.
For new print head installation, put IBM No.6 oil
on the 2 felt washers on the right bar, the bronze
block, and rear slide points on the left bar.
4.
Push the print head to the ramp position (far left).
5.
For installation, push the print head in and out of
the ramp position to ensure that the head moves
back correctly.
Remove the ribbon from the print head and its
covers, and place the ribbon to the right.
6.
Open the ribbon feed rolls
II
and remove the
print head cover (2 screws).
7.
For installation, adjust the print head.
8.
Disconnect the print head cable from EC3
II.
9.
To the right of the print head, remove the screw
II
and hold-down
IE
that hold the bronze tabs.
10.
To the left of the print head, remove the screw
II
that holds the bronze block.
11.
Remove the cover from the oil felt and pull the oil
wick from the felt
II.
For installation, if there is
no oil in the felt, add IBM No.6 oil and check that
the wick touches all 8 print wires
II
or
lB.
12.
For new print head installation, install the old wick
in the new print head
III
or
lB.
13.
Lift off· the print head.
14.
For installation, tilt the tip of the head down so
that it will slide under the print head forms guide.
15.
To reinstall the print head, reverse this procedure.
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