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Ribbon Feed Unit
Eccentric
Screw
A
Ribbon Feed
Pawl Spring
Screw
B
Adjusting
Screw
Plate
Assembly
AQ
l ¥:
Plate Adjusting
Screws
Code Plate
(0)
Vertical Shift
Plate Guide Stud
Print Unit
Print Drive Rod
(note position)
Figure 4-50. Print Head Removal
2. Pull out the desired wire for inspection. Be sure to
back against it. Cut off the end of the wire as close as
replace it in the same position; all wires have a different
possible to the wire guide and carefully stone it even with
length. If the print wire has been pulled outofits head,
the other wires. Oil the cotton wicking with IBM # 6.
a new wire may be inserted from the front end and the
old wire pushed up enoughtopull it out.
Note: Apply IBM #6oil to any print wire before installing it
in the print unit. Usually a new wire can beinstalled
4.11.3.3 Code Plate
without difficulty by inserting it in the hole from which the
1. Remove the print head from the machine.
old wire was removed. Lightly stone the edge of the new
2. Unhook the ribbon feed pawl spring. Remove the two
wire to remove any burrs. Do not makethe wire pointed. If
screws (A, Figure 4-50) from eachside.
trouble occurs, it is then necessary to insert another wire,
3. Remove the ribbon feed unit bylifting it off the print
used as a guide, from the front end. In this procedure, the
unit.
end of the new wire should be pointed. (If a new wire is
4. Remove the two vertical shift plate guide studs and the
used as a guide, stone its end flat.) Then, using the first wire
vertical shift plate.
as a guide, push the new wire into the unit as shown in
5. Set the print unit on the plate adjusting screws; this
Figure 4-51. Reinstall the rear guide plate and pull all wires ™~
prevents the code plate shims from getting out of place.
29FEMM
(4/69)
4-35
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