Technical data

4-18

SCSI Device Storage Module

Power Supply Removal and Replacement

The power supply module (Figure 4-6 on page 4-19) is installed at

the right side of the drive bays in the module’s chassis. The power

supply receives –48Vdc or 115/230Vac input power directly

through its back panel. The power supply outputs are cabled to the

cooling fan and to a backplane connector, which applies operating

voltages from the power supply to the mass storage modules.

Caution

Removal of a power supply module involves exposure

to high voltages. Avoid touching the connectors. Allow

one minute for the capacitors in the power supply to

discharge.

The suggested procedure for removal and replacement of the

module’s power supply module is as follows:

Removal

1. Switch the power supply of the host system to

STANDBY.

2. Disconnect the input power source from the module’s

chassis:

– If the power supply is an AC unit, unplug the power cord

from the AC outlet (the other end of the cord disconnects

automatically when you remove the module from the

chassis).

– If the power supply is a DC unit, turn off the –48Vdc

power source and unplug the DC connector from the

power supply input.

3. After waiting for the power to fully discharge from the

supply, remove the module’s bezel, if installed.

4. At the upper right corner of the power supply module, loosen

the captive screw that holds the module in the chassis.