Removal and Installation Procedures
6-32
TDS 420A, TDS 430A & TDS 460A Service Manual
4. Remove the trim ring:
a. Grasp the trim ring by its top edge and pry it up and lift it forward to
snap it off of the top front of the main chassis.
b. Repeat the process, prying on the bottom edge of the trim ring to
complete its removal.
c. Lay the trim ring on its face on the work surface.
5. Remove the EMI gaskets: If servicing the front EMI gaskets, lift them out of
the trim ring.
6. Remove the menu elastomer: If servicing the menu elastomer, lift it out of
the trim ring.
7. Remove the menu buttons: If servicing the menu buttons, lift them out of the
trim ring.
8. Reinstallation:
a. If the menu buttons were removed, insert each button into its hole in the
trim ring.
b. If the menu elastomer was removed, align it over the menu button holes
in the trim ring and press it in to install. Avoid touching the carbon
contact points on the elastomer.
c. Without installing the EMI gaskets, align the trim ring to the front of the
chassis and push it on to seat. B e sure that both pairs of flex locks, one
pair each at the inside top and bottom of the trim ring, snap over the
edge of the chassis.
d. Do the following subparts to install the EMI gaskets (see Figure 6--10):
H Install the front cover on the oscilloscope.
H Lay the scope so its front cover is on the work surface.
H Align an EMI gasket so it lays between any pair of adjacent flex
locks along the groove between the cabinet.
H Using a wood spudger, push the EMI gasket until it is firmly seated
at the bottom of the groove. It should not overlap either flex lock.
H Repeat the process just described to install the remaining three
gaskets.
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