Line Plate Card, Removal And Replacement - IBM 3274 51C Maintenance Information

4.13 Line Plate Card, Removal and Replacement
(Figure 4-12)
1.
Place the
fIl / l2J
(on/oft) switch in the
[QJ
position.
2.
Remove the power cord plug from the building power
receptacle.
3.
Remove the three screws holding the line plate
0 .
4. Remove the line plate cover
e .
5.
Disconnect cables going to the line plate card
G.
Warning: For integrated modem multipoint attachment,
when the 3274 I/O telephone cable is unplugged, the tele-
phone socket must be terminated with 600-ohm resistors.
The 600-ohm terminating plug (shown in Figure 5-11,
Part 1 of 2) can be used.
Yellow·Green
Grounding Wire
Figure 4·12. Line Plate Card (World Trade Countries)
6. Remove the two screws holding the line plate card and
the green and yellow grounding wire
e .
7.
Remove the line plate card.
8. Install the line plate jumpers (use the old line plate card
as a guide).
9.
To reinstall, reverse these steps.
I
DANGER
You must reinstall the yellow-green grounding wire
removed in step 6.
Prime Power Box
and Transformer
(U.S. and Canada)
Chapter 4. Removal and Replacement Procedures 4-13