IBM T00 Service Manual page 44

The following illustration shows a typical dc power distribution panel (internal view).
1 Mounting Screws
2 Top Cover
3 Bus Bar Shield (Insulation)
4 Terminal Block (Both Sides of the
Rear Cover)
5 Covers for Empty Circuit Breaker
Positions
7. With a multimeter, verify that no voltage exists between the two -48 V dc bus bars and the two -48 V
dc return bus bars.
8. Ensure that the customer's service provider completely disconnects the two -48 V dc power source
cables from the -48 V dc bus bars, and the two -48 V dc return ground cables from the -48 V dc
return bus bars.
9. Record the locations and connection points of all cables.
10. Disconnect all drawer power cables.
1 Front of Power Distribution Panel
2 A -48 V dc (-) Bus Bar
3 A -48 V dc (-) Power Cable
4 A Return (-) Bus Bar
5 A Return (-) Power Cable
32
7014 Model T00, and Model T42 Service Guide
1
9
8
5
7
6
2
3
4
6 Front Bezel
7 Bezel Mounting Screws
8 Circuit Breaker Switches
9 Circuit Breaker Position Labels
6 B Return (-) Power Cable
7 B -48 V dc (-) Power Cable
8 B Return (-) Bus Bar
9 B -48 V dc (-) Bus Bar