3745 FRU Exchange Procedure
PS1 Exchange Procedure
Removal Procedure
1. Inform the customer that the 3745 is to be
powered OFF.
2. Press Power Off on the control panel.
3. Open the front door.
4. Open the rear door.
5. Switch CB1 OFF. Refer to Figure 4-90.
6. Locate the PS1 and Primary power box. Refer
to Figure 4-90.
7. Remove the DMUX/PS1 cover. Refer to
Figure 4-91. Two screws must be removed
1.
Refer to Figure 4-93 and to Figure 4-92 on
page 4-68 and do the following:
8. At the Primary power box, remove the power
cable going to PS1 2.
9. Remove the cover which protects TB1 to TB4
(two screws must be removed).
10. Remove the cover which protects TB5 and
TB6 (two screws must be removed).
11. Verify that on each side of the PS1, the power
cables are labeled according to their positions.
If not done, label them.
12. Remove the cables from the PS1.
13. Remove the two screws 3 which hold PS1
to the frame.
14. Remove the cable between Fan1 and the
primary power box (J7).
15. Slide the PS1 out.
Figure 4-90. Power Supply 1 (PS1) and CB1
Locations
Figure 4-91. Power Supply 1 (PS1) Cover
Chapter 4. 3745 FRU Exchange 4-67
