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Removal and Installation Procedures
TDS 684A, TDS 744A, & TDS 784A Service Manual
6–23
4. Remove the trim ring: Grasp the trim ring by its top edge and pry it up and
lift it forward to snap it off of the front subpanel. If servicing the menu
buttons, lift them out of the trim ring. (When reinstalling, reinsert the menu
buttons, align the trim ring to the front subpanel and press it back on.)
5. Remove the attenuator panel: Gently pry, using your fingers, the snap-off/
snap-on attenuator panel away from the front subpanel to remove it. (When
reinstalling, use your hands to press it back on.)
6. Reinstallation: Do in reverse steps 3–5 to reinstall the attenuator panel,
menu buttons, trim ring, and the front cover, following the reinstallation
instructions found in each step.
NOTE. This procedure includes removal and reinstallation instructions for the
front panel and front panel buttons. Unless either of those modules are being
serviced, do not do step 4, “Further disassembly of front-panel assembly.”
1. Assemble equipment and locate modules to be removed:
a. Have handy a screwdriver with a size T-15 TorxR
tip (Items 1 and 2).
b. Locate the modules to be removed in the locator diagram External
Modules, Figure 6–1.
c. Do the procedure Front Cover, Trim Ring, Menu Buttons, and Attenuator
Panel, steps 1–5, immediately preceding this procedure.
2. Orient the oscilloscope: Set the oscilloscope so its bottom is down on the
work surface and its front is facing you.
3. Remove the front-panel assembly:
a. Lift the front-panel assembly out of the front subpanel until you can
reach the interconnect cable connecting it to the processor/display board.
b. Disconnect that cable at J2 of the processor/display board. Disconnect
the flex-board connector at P3 of the front-panel assembly. (The flex
board is part of the display-frame assembly.) Disconnect cable W76. See
Figure 6–8.
c. Finally, lift the front-panel assembly out of the front subpanel to
complete the removal.
A12 Front-Panel Assembly