Chapter 39 Hardware procedures 367
Multiservice Switch 7400 Hardware Installation, Maintenance, and Upgrade 6.1S2
2 Position a seismic side panel against a vertical rail inside the seismic
cabinet as shown in the figure “Position of side panels and cross rails for
a Multiservice Switch 7460 in a seismic cabinet” on page 369.
3 Fasten the side panel to the vertical rail using 4 of the provided #12-24
thread-forming screws. Space the 4 as evenly as possible. Tighten to
snug plus a 1/4 turn.
4 Position the second side panel against the vertical rail on the opposite
side of the cabinet and fasten it the same way.
5 On the shelf assembly of the device, measure the length from a mounting
ear to its rear edge. Record this as the depth of the shelf assembly.
6 Mark the depth of the shelf assembly onto the upper side panel slot by
measuring from the vertical rail. The marks indicate where the cross rails
will be fastened.
7 Repeat marking the depth on the lower slot, and repeat the marking on
the opposite side panel.
8 Position a cross rail between the side panels at the depth marks and
orient them as shown in the figure “Position of side panels and cross rails
for a Multiservice Switch 7460 in a seismic cabinet” on page 369.
9 Fasten a cross rail through the left and right slots in the side panels at the
depth marks using a washer with a #10-32 slotted screw. Tighten to snug
plus a 1/4 turn.
10 Fasten the second cross rail in the same way through the lower side panel
slots. Observe its mirrored orientation in the figure.
The position and orientation of the cross rails are to cradle the rear edges
of the shelf assembly when it is installed.
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