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Removal and Installation Procedures
6–38
TDS 684A, TDS 744A, & TDS 784A Service Manual
b. Locate the modules to be removed in the locator diagram Outer-Chassis
Modules, Figure 6–2, page 6–13.
c. Do the procedures A14 D1 Bus and Analog-Power and Digital-Power
Cables (page 6–29), A23 SerPar Board (page 6–31), if option 05 is
installed A29 Video Trigger Board (page 6–32) and A11 Processor/Dis-
play Board (page 6–36) to remove those modules.
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 top cover: Remove the 12 screws securing the top cover to the
main chassis, then slide it back until its front edge clears the retainers in the
front subpanel. Lift the top cover away to complete removal.
4. Remove the board mount(s): From the top side of the top cover, use the
flat-bladed screwdriver to pry up the retainer lug until it clears the slot in the
front cover. While holding the lug clear of the slot, push the mount towards
the rear until it releases. (When reinstalling, be sure to align the lug properly
and be sure it snaps into its slot.)
Figure 6–17: Board Bracket Removal
5. Reinstallation:
a. Do in reverse order steps 3 and 4, reversing the procedure outlined in
each step to reinstall the assembly. Then see the following procedures, in
the order listed, to complete reassembly of the oscilloscope.