Removal and Installation Procedures
6-38
TDS 420A, TDS 430A & TDS 460A Service Manual
9. Reinstallation:
a. If the menu flex circuit was removed in step 8, do the following subparts
to install a new circuit (reference Figure 6--12 on page 6--36):
H DO NOT touch the contacts on the menu flex circuit with your bare
fingers. You should wear clean cloth gloves that are free of lint when
installing the menu flex circuit on the front chassis.
H Wipe the front of the chassis using isopropyl alcohol and a clean,
lint-free cloth. Let the chassis dry. (Some adhesive from the flex
circuit you removed will be left on the front of the chassis. This is
normal.)
H Find the score line in the adhesive backing and peel the backing off
of the menu flex circuit.
H Carefully align the three holes on the menu flex circuit to the locator
studs on the front of the main chassis. When the alignment is
correct, press the flex circuit against the chassis so it adheres to the
chassis.
H Clean the surface of the menu flex circuit just installed using
isopropyl alcohol and a clean, lint-free cloth.
b. See step 6 to install the probe code flex circuit if it was removed.
c. See step 5 to install the ESD shield if it was removed.
d. If the front-panel assembly was disassembled for cleaning in step 7,
apply a thin coating of bearing grease (Dow Corning #1292) to the two
switch patterns (circular patterns for the vertical scale rotary switches) on
the circuit board. Then reverse substeps 7a--7d to reassemble, using
Figure 6--13 as a guide.
e. Do in reverse order substeps 4a through 4d, reversing the procedure
outlined in each step. Be sure to dress the CPU-to-front-panel cable so
that the loop of extra cable length is in the front-panel cavity of the
chassis, as shown in Figure 6--4.
f. See the following procedures to install those modules removed by the
access procedure:
H Front Cover, Rear Cover, Cabinet, Rear EMI Gasket, and Cabinet
Handle and Feet (page 6--27) to reinstall the cabinet and rear cover
H Line Fuse and Line Cord (page 6 --26) to reinstall the line cord,
which completes the oscilloscope reassembly
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