SA7x Technical Description
2.2 SA7x Frame
2.2 SA7x Frame
The SA7x frame is made of plated steel panels fastened together with rivets.
Acoustic panels cover the sides of the frame. Internal cabling for the enclosure is
routed down the sides of the frame inside the acoustic panels.
Four rails, located on each side of the frame, slide on surfaces inside the chassis.
In its closed position, the frame is secured to the chassis with four mounting
screws on the front cover. The frame can be pulled out of the chassis for
servicing.
WARNING
Be careful when pulling out the SA7x frame to access internal
components. A stop mechanism located on the right side of the
enclosure between the frame and chassis locks the frame at a point
that allows access to the fan assembly. When the frame is pulled out and
locked, three-quarters of the frame is exposed. If you release the stop
mechanism, nothing prevents the frame from being pulled completely free
of the chassis, possibly causing personal injury.
The frame assembly has recesses for the disk drive positions, the fan assembly,
and the power supply. Internal ducts route the air flow through holes into the
front cover of the enclosure, through the center-located fan assembly, and out of
the holes in the enclosure’s rear cover.
Each disk drive position contains guides for the RA7x disk drive shoe plate. The
drive is locked into position with a retaining clip that latches into a tab on the
shoe plate. See Figure 2–2 to locate the retaining clip and shoe plate retaining
tab in an SA70 enclosure (with RA70 disk drives).
A configuration label is located inside the frame to show the proper placement of
the RA7x disk drives.
The frame is used to mount several important components of the enclosure,
including the transition board assemblies. (Refer to Figure 2–1.) The transition
board assembly consists of two boards: transition board 1 (TB1) and transition
board 2 (TB2). TB1 mounts to the front of the SA7x frame. The OCP mounts to
TB1. TB2 mounts to the frame above the disk drives. TB2 interfaces to TB1.
The upper-rear panel of the frame carries the standard disk interface (SDI)
connector bulkhead. The lower-front panel of the frame holds the four dc drive
power switches for the disk drive positions.
A front cover fits over the disk drives at the front of the enclosure; a rear cover
fits over the disk drives at the rear of the enclosure. Both covers include holes for
airflow. Each cover is secured with tabs at its lower edge and a mounting screw
in each upper corner.
SA7x Technical Description 2–3
