IBM 3278 Series User Manual

19. When tightening the CRT mounting nuts, ensure
that the ground strap is flat against the CRT bell
and under the spring. Gradually tighten the nuts,
alternating from
nut to nut until all are fully
tightened.
20. See that the yoke cable is located at the top
when replacing the yoke assembly.
21. Perform all display station image adjustments
(see
Chapter 5).
22. Tighten the yoke mounting screws after
adjustments.
6.4 Yoke and Shields
The yoke and shield assemblies are removed from
the CRT neck as a unit. After the assemblies are
removed,
they can be separated.
Note:
The top and rear covers must be removed,
and the logic gate must be opened.
1. Disconnect the yoke cable from the gate, and
disconnect
the ground wire(s) from the CRT
bell
ground strap.
2.
Cut the yoke cable fasteners on the logic gate,
and support. Disconnect
the CRT socket ground
lead from the CRT bell ground strap, located in
front
of the yoke assembly.
3. Remove
the socket from the base of the CRT.
4. Remove the cone shield from the base area of
the CRT:
a. Loosen the shield retaining screw.
b. Turn the cone shield counterclockwise until
the locking tabs disengage.
c.
Pull the cone straight back and clear of the
CRT.
5. Loosen the yoke clamp, and carefully slide the
assembly off the CRT.
6. Remove the clamp from the centering magnet
assembly.
7. Separate
the yoke from the shield by pressing the
plastic tabs (4) located around the shield cir-
cumference, and slide the yoke forward (away
from
the clamp).
SV27-2510-6
(1/81) '6-7

IBM 3278 Series Specifications

General

Brand	IBM
Model	3278 Series
Category	Desktop
Language	English