
Assembly Replacement 8712ET/ES and 8714ET/ES
A7 Display Assembly Replacement RF Network Analyzers
3-20 Service Guide
A7 Display Assembly Replacement
The display consists of the CRT assembly and a matched circuit board. Both assemblies
must be replaced at the same time.
CAUTION Perform the followingonly at an approved ESD workstation. SeeFigure 4-1
on page4-3.
Removing the Display Assembly
1.Disconnect the power cord.
2.Remove SCREW 7 (two places) as indicated on the rear-panel label.
3.Remove the two screws (located on the display side of the analyzer) from the bottom of
the analyzer chassis.
4.Remove the front panel assembly (see“Removing the Front Panel Assembly” on page
3-4). Remove the handle nut plate on the left side only.
5.Pull out the enclosure 2 or 3 inches from its cavity.
6.Disconnect the ribbon cable from the jack behind the top of the CRT.
7.Completely withdraw the enclosure from its cavity.
8.Remove the screw from the display access panel and open the panel.
9.Disconnect all associated cables from the CRT and its circuit board.
10.Remove the four nuts and washers (one set from each corner) that secure the CRT to
the display enclosure. Withdraw the CRT from the enclosure.
11.Remove the 2 screws that secure the circuit board to the display enclosure. Withdraw
the circuit board from the enclosure.
Replacing the Power Switch or the Brightness Control
1.Remove the display enclosure from the analyzer.
2.Locate the switch and the brightness control at the left side of the display. Remove both
of these from the display flange.
3.Both the switch and brightness controls and their associated cables must be replaced as
a unit.
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