DEC Rackmount 7000 AXP Installation And Owner's Manual page 102

Removal and Replacement
Perform the following procedure to remove the ac front end 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 ac front end tray connectors for
about 30 seconds after the XMI circuit breaker is turned off.
3. Disconnect the power supply connectors from the appropriate ac front end
tray to be replaced (see Figure 5–21 and Figure 5–22).
5–38 Removal and Replacement
WARNING
WARNING