Machine Access - Board/Tsr Supply - IBM 3274 51C Maintenance Information

4.2 Machine Access - BoardjTSR Supply
(Figure 4-2)
1.
Place the
fil / l2J
(on/off) switch in the
l2J
position.
2. Loosen the shipping bolts
0
if necessary and swing
the gate open
0 .
3. Depress the spring latches
G
and open the low-voltage
power supply (LVPS) housmg
CD.
Card
Retainer
0-----
Figure 4·2. Machine Access, Board/TSR Supply
Warning: When the board is in the service position, the
card/connector rows (l, 2, 3, 4, S, 6) are inverted. Be
careful when identifying the correct position of any card
or connector.
4. To close the gate assembly, reverse these steps and
depress the gate latch
e
to allow the gate to close.
S. Card retainer
e
can be discarded after removal.
CAUTION
When the gate is being closed, be careful not to allow the
hand and fingers between the gate comer and housing
frame
G.
/
o
Chapter 4. Removal and Replacement Procedures 4·3