Table of Contents
Advertisement
4.2.10
Print Unit Assembly
(50, 100, and 155 Ipm)
4.2.10.1 Print Units With Pivot Screws
I
DANGER
The ribbon clutch solenoid becomes very hot
aft~r
use. Be sure it is cool before performing
marntenance.
Removal
1.
2.
3.
4.
5.
6.
7.
8.
9.
Remove the printer covers (4.2.1) steps 1
through 3.
Remove the rear forms guide.
Remove the two printer mounting screws
under the frame.
To make removing the print unit easier,
the printer can be lifted, slid forward, and
rested on the keyboard cover.
Unplug all printer cable plugs to the
print unit (P1, P4, P5). Unplug P13 and
remove the ground wire, if installed.
Loosen the bottom locknut and remove
the print unit stop screw located at the
left front of the printer
II .
Loosen both print unit pivot screws
Support the print unit assembly and
remove the pivot screws.
r.I
....
Remove the print unit by pulling forward
until the guides disengage the paper clamp
levers
m.
Replacement
1.
Raise the paper clamp levers
m.
2.
Tip the print unit backward slightly and
place the levers into the guides.
3.
While checking that the print unit clears
the interlock switch, ribbon shield, and the
hammer unit, carefully lower the print
unit into position. Also check that the
type belt drive motor cable
m
is located
behind the print unit.
4.
Install the pivot screws. Tighten the right
screw slightly to be sure the print unit
locates properly, then tighten both screws.
5.
Plug in all cable plugs. Install ground wire,
if removed.
6.
Install two print unit return springs on each
stud
m.
7.
Install and tighten the print unit stop screw
B
,then tiHhten the bottom locknut
against the base.
8.
Lower nuts
II
and washer
II
to touch
the bottom nut. Open the print unit.
9.
Adjust the upper nut upward until the
washer
II
just touches the bottom of
the print unit, then continue to turn the
nut 3/4 ± 1/4 turn. Tighten the center nut
against the upper nut. This adjustment
results in approximately 0.5 inch (12.7 mm)
m
clearance between the bottom of
the print unit and the spacer when the
print unit is closed.
10.
Close the print unit and ensure that the
release lever
II
operates properly.
11.
Make sure all printer cable plugs are in
their sockets.
12.
Replace cover, rear forms guide, and print-
er mounting screws.
4-26
Advertisement
Table of Contents
