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Set Screw
(Access Hole For Side)
Actuotor Mounting Bracket
Rear Control
Cable Clamp
Center
Diagram 5·1. OFF-PUSH Switch Adjustment
7. Pull OFF-PUSH switch fully forward to the on
position. Slider should
be
against the stop ring.
8. Press down and hold actuator so power switch plungers
are fully activated.
9. Tighten control wire setscrew. (Avoid overtightening
setscrew. Overtightening will cause control wire to
bend and prevent proper operation.)
10. Activate OFF-PUSH switch to check that slider remains
forward against stop ring with power switch plungers
fully depressed. Repeat steps 8 and 9 if these condi-
tions are not met.
5.3 REMOVALS
The following paragraphs describe removal and replacement
procedures for IBM 3277 Display Station FRUs. Where the
procedure for removing and replacing a unit in the Modell
display station differs from the procedure used with the
Model 2 display station, a separate paragraph describing the
unique procedure is presented. All removal and replacement
Actuator
Power Switch Plungers (2)
procedures require that the desired unit has been made
accessible by the removal of necessary cOIIers and made safe
by the removal of power. The top cover can be left on the
display station while performing most maintenance pro-
cedures. This provides a degree of safety by keeping the
CRT covered.
5.3.1 Covers
5.3. 1. 1
Model
1
Cover Removal
1. Front Cover: Pull out on bottom edge.
Note:
Security key must be removed from lock before
removing right-side cover.
2. Side Covers: Insert a stiff card or badge in slot in
grillwork at edge of top cover to unlatch side cover.
3. Top/Rear Center Cover:
Release the four quick-
disconnect fasteners that hold combination top/rear
center cover to frame.
Checks, Adjustments, and Removals
5-9
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