10 Setting the NT4G19EA Power Supply for 115 or 220 Vac Operation
Practice 450-1011-201
Installing the SRUs
SRUs are installed in preassigned shelf positions in the cabinets. The configuration
for your system installation has been recorded during configuration planning and
has been entered in the Site Records, 450-1011-152. If you do not have the
appropriate worksheets, see the system administrator.
- CAUTION -
Always power the system down before installing or removing any SRU, and
before connecting or disconnecting any SCSI cable..
Before installing the 350 Megabyte Mass Storage SRU, ensure that the address
switch is set to the right address. For SASI systems, set it to 2. For SCSI systems,
the address of each device on the SCSI bus is specified on the worksheet titled ‘File
System Administration’ in the Site Records, 450-1011-152.
Before installing a Digital Trunk Link SRU, set the cable equalization switch on the
rear of the SRU as described in Part 8.
Install each SRU in its preassigned slot according to the following procedure. The
Power Supply SRUs should be installed before any other SRUs.
- WARNING -
The Mass Storage and Power Supply SRUs are very heavy and must be
handled carefully to avoid personal injury, or damage to the unit or other
equipment.
- CAUTION -
SRUs are sensitive electronic devices and can be damaged by electrostatic
shock or rough handling. Do not touch the rear connectors.
(1) Open the shipping carton and remove the SRU.
(2) Grasp the top of the SRU with one hand and the rear of the SRU with the other
hand. Do not touch the rear connectors.
(3) Guide the SRU into the grooved slot of its assigned shelf position. (See the
provisioning tables, which should be kept in the Site Records, 450-1011-152.)
(4) Release the primary latches on the top and bottom of the SRU faceplate by
pushing the secondary latches with your finger. The secondary latch is
underneath the primary latch.
(5) Hold the top and bottom latch levers outward (at right angles to the SRU as
shown in Fig. 6-4). Then, gently slide the unit into the shelf, past the safety latch
on the bottom of the SRU, until the SRU touches the backplane connector. The
latches must clear the front channel.
