Removal and Installation Procedures
TDS 420A, TDS 430A & TDS 460A Service Manual
6-57
h. Lift the power-supply mount out of the chassis to complete the removal.
5. Reinstallation:
a. When reinstalling the power-supply mount, be sure to press it flush
against the chassis before sliding it towards the bottom of the chassis
to lock.
b. Perform steps 4a through 4h in reverse order.
c. Front Cover, Rear Cover, Cabinet, Rear EMI Gasket, and Cabinet
Handle and Feet (page 6--27) to reinstall the cabinet and rear cover.
d. Line Fuse and Line Cord (page 6--26) to reinstall the line cord, which
completes the oscilloscope reassembly.
1. Access the module: Be sure you have performed the Access Pr ocedure on
page 6--13 and removed the modules as instructed.
2. Locate modules to be removed:
a. Use a screwdriver with a size T-15 Torx
R tip (Items 1 and 2) and a pair
of duck bill pliers (Item 8).
b. Find the low voltage power supply and, if it is to be removed, the
power-supply mount in the locator diagram Internal Modules,Fig-
ure 6--3 on page 6--19.
3. Orient the digitizing oscilloscope: Set the digitizing oscilloscope so its
bottom is down on the work surface and its front is facing to the right.
CAUTION. When releasing the low voltage power supply from its mount, take
care not to push on the board components. Rather, push on the board edge when
performing the following step and its substeps.
4. Remove the low voltage power supply:
a. Disconnect P2 a 22 square pin connector, power supply cable coming
from the backplane assembly.
b. Disconnect P3 connector located on the low voltage power supply board.
c. Disconnect the remaining two conductor (black and red) connector
located on low voltage power supply board.
d. Disconnect J3 FAN PWR two conductor (black and red) connector
located on the small low voltage power supply board.
e. Disconnect J7, 8 conductor flex cable located on the small low voltage
power supply board.
A25 Low Voltage Power
Supply and its Mount
B080000 & up
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