Replacing The Gas Lift - Extron electronics HSA 400 US/Domestic User Manual

Maintenance and Modifications, cont'd

Replacing the Gas Lift

The gas lift that raises the HSA surface is rated for 100,000
opening and closing cycles. Contact the Extron S
Technical Support Hotline at the nearest phone number listed
on the rear cover of this manual to obtain a replacement gas lift.
Replace the gas lift as follows:
Ensure that AC power is disconnected before
servicing the HSA unit.
When the HSA 400/402 is upside-down, the latch
CAUTION
may be ineffective. If the latch releases, the enclosure
will tip and could damage the flanged edges. Keep a
hand on the enclosure to keep it from tipping.
Remove the surface mount enclosure from the table. See
1.
"Removing and Replacing the Enclosure", steps 1 through 8.
Place the enclosure upside-down on a horizontal surface.
To protect the finish, place the enclosure on a soft cloth.
Loosen the three Phillips head screws that secure the gas
2.
lift mounting plate in place (figure 3-6).
Loosen (3)
screws.
Figure 3-6 — Releasing the gas lift
Slide the gas lift mounting plate toward the center of the
3.
enclosure, releasing the mounting plate from the enclosure
(figure 3-6).
HSA 400/402 Series • Maintenance and Modifications
3-8
Sales &
3
Slide plate back,
then lift straight up.
Turn the gas lift mounting plate counterclockwise until the
4.
pivot nut on the plate comes free from the shaft of the gas
lift (figure 3-7).
Top Panel
Bracket
Piston End
Gas Lift
Pivot Nut
Figure 3-7 — Replacing the gas lift
Turn the surface mount enclosure onto its back side and
5.
open the top panel.
With the gas lift disconnected, the top panel must be
manually lifted.
Remove and retain the 9/32" nut and bolt that secure the
6.
gas lift to the top panel clevis. Pull the gas lift out of the
enclosure.
Insert the piston end of the replacement gas lift through
7.
the hole in the bottom of the enclosure adjacent to the
latch, and secure the lift in the clevis on the top panel with
the nut and bolt that were removed in step 6.
Thread the pivot nut on the gas lift mounting plate onto
8.
the shaft of the gas lift and tighten it several turns.
Firmly push the gas lift mounting plate into position on
9.
the underside of the enclosure, engaging the three
mounting screws with the holes in the plate. Holding the
plate in position, secure it to the enclosure with the three
screws that were loosened in step 2.
Reinstall the surface mount enclosure. See "Removing and
10.
Replacing the Enclosure", steps 11 through 17.
HSA 400/402 Series • Maintenance and Modifications
Clevis
Flange and
Top Panel
Assembly
Lower
Enclosure
Gas Lift
Mounting Plate
3-9