Removal and Installation Procedures
TDS 520A, 524A, 540A, & 544A Service Manual
6Ć49
Rear Chassis
1. Assemble equipment and locate modules to be removed:
a. Have handy a screwdriver with a size TĆ15 TorxR tip (Items 1 and 2)
and a TĆ20 TorxR tip (Items 1 and 2).
b. Locate the modules to be removed, including those listed under
Additional Modules Removed in the locator diagram OuterĆChassis
Modules, Figure 6Ć2, page 6Ć13.
c. Install the front cover if it's not already installed.
2. Orient the oscilloscope: Set the oscilloscope so its bottom is down on the
work surface and its rear is facing you.
3. Remove the rear chassis: Use Figure 6Ć23 as a guide when doing the
following substeps:
a. Unplug the GPIB interconnect cable at J32 of the processor/display
board.
b. Remove the 6 screws securing the rear chassis to the main chassis
and the two screws securing it to the lowĆvoltage powerĆsupply
shield.
c. Lift the rear chassis up slightly to access the cables connected to it.
Disconnect those cables from CH 3 OUT (at J1201), AUX TRIG IN (at
J1550), MAIN TRIG OUT (at J1000), DELAYED TRIG OUT (at J1001),
all found on the acquisition board.
4. Reinstallation: Do, in reverse order, substeps 3a-3b, reversing each step
to reinstall the rear chassis. Then see the following procedures, in the
order listed, to complete reassembly of the oscilloscope.
H A14 D1 Bus and Power Cables (page 6Ć34)
H Rear Cover and Cabinet (page 6Ć20)
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