Removal and Installation Procedures
TDS 420A, TDS 430A & TDS 460A Service Manual
6-41
NOTE. The display tube and the display-driver board are a single module and
must be removed and replaced as such. They are listed as a single module in the
Replaceable Parts List.
1. Access the module: Be sure you have performed the Access Pr ocedure on
page 6--13 and removed the modules as instructed.
2. Assemble equipment and locate modules to be removed: Have handy a
screwdriver with a size T-15 Torx
R tip (Items 1 and 2). Locate the module
to be removed in the locator diagram Internal Modules, Figure 6--3,
page 6--19.
3. Orient the digitizing oscilloscope: Set the digitizing oscilloscope so its
bottom is down on the work surface, with its front facing you.
WARNING. Monitor assembly handling: Use care when handling a monitor. If
you break its display tube it may implode, scattering glass fragments with high
velocity and possibly injuring you. Wear protective clothing, including safety
glasses (preferably a full-face shield). Avoid striking the display tube with or
against any object.
Monitor storage: Store the monitor with its display tube face down in a
protected location, placing it on a soft, nonabrasive surface to prevent scratch-
ing the face plate.
4. Remove the monitor:
a. Take the precautions outlined in the WARNING above. Refer to
Figure 6--15 while doing the following substeps.
b. Unplug the main cable at (J901), then rotate the digitizing oscilloscope
so its top is down on the work surface, with its bottom facing upwards.
c. Remove the three T-15 Torx
R screws securing the monitor assembly to
the bottom of the main chassis. Return the digitizing oscilloscope to the
orientation established in step 2.
WARNING. High-voltage is present on the anode lead. It is NOT necessary to
unplug the anode from the monitor when removing or replacing the monitor
module; therefore, do not do so.
d. Remove the three T-15 Torx
R screws securing the monitor assembly to
the top of the chassis. (See Figure 6--15 to locate the screws.)
A26 Monitor assembly
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