DEC Rackmount 7000 AXP Installation And Owner's Manual page 108

Removal and Replacement
Perform the following procedure to remove the +5 Vdc regulator trays:
Before performing the following removal and replacement
procedures, switch off the circuit breakers on the back of the
XMI chassis and on the power controller.
1. Extend the XMI chassis for service (see Section 5.3.2).
2. Remove the top cover (see Section 5.3.3).
High voltage is present on the power supply connectors for about
30 seconds after the XMI circuit breaker is turned off.
3. Disconnect the power supply connectors from the appropriate +5 Vdc
regulator tray to be replaced (see Figure 5–21 and Figure 5–22).
4. Remove the bottom cover (see Section 5.3.4).
5. Remove the two 8-32 KEP nuts from the (-) bus bar on each of the +5 Vdc
regulator trays (see Figure 5–25).
6. Lift the bus bar off of the mounting posts and carefully bend the (-) bus bar
down and back out of the way so that the tray will clear the bus bar when the
tray is removed (see Figure 5–25).
7. Remove the horseshoe shaped bus bar.
8. Remove the two 8-32 KEP nuts from the (+) bus bar on each of the +5 Vdc
regulator trays (see Figure 5–25).
9. Remove the horseshoe shaped bus bar.
10. Lift the bus bar off of the mounting posts and carefully bend the (+) bus bar
down and back out of the way so that the tray will clear the bus bar when the
tray is removed (see Figure 5–25).
It is not necessary to bend the bus bar out of the way to remove
the master regulator tray.
5–44 Removal and Replacement
WARNING
WARNING
NOTE