Prime Power Box, Removal And Replacement; Prime Power Box - IBM 3274 51C Maintenance Information

4.5 Prime Power Box, Removal and Replacement
(Figure 4-4)
I
DANGER
Input voltage is present in the On/Off switch housing
when power is turned off (
fIl /
~
switch
in
the
~
position).
1. Place the
III / l2J
(on/off) switch in the
l2J
position.
2. Remove the power cord plug from the building power
receptacle.
3. Remove the power cord plug located at the rear of the
3274.
Mounts to
Chassis GND
Yellow/Green
Grounding Wire
(To On/Off Switch)
Figure 4-4. Prime Power Box
Rear View
-
4. Disconnect all the connectors
0
from the prime
power box.
5. Remove the two hex bolts
G
from the upper and
lower mounting brackets.
6. Disconnect the ground wire
G
from the machine
chassis.
7. Remove the prime power box. To reinstall, reverse these
steps.
--
I
DANGER
You must reconnect the green-yellow wire to ground
(removed in step 6).
-
-- -
---
u.S.
and Canada
Notes:
J1 - To On/Off switch
J2 - To file drive
J3 - To transformer
J4 - A C line cord
J5- To fan
Chapter 4. Removal and Replacement Procedures 4-5