Tektronix CSA7404B - Page 259

Removal and Installation Procedures
CSA7404B, TDS7704B, TDS7404B, TDS7254B & TDS7154B Service Manual
6-39
Rear power
distribution
circuit board
Front power
distribution
circuit board
PA bus
circuit board
Figure 6- 23: Front and rear power distribution and PA bus boards removal
1. Assemble equipment and locate modules to be removed: Locate the modules
to be removed in the locator diagram Internal Modules, Figure 6--8,
on page 6--21. Additional modules to be Removed:
H Trim (all)
H Bottom cover
H Left and Right covers
H Front and Rear Distribution Boards and the PA bus interconnect board
2. Orient the instrument: Set the instrument so its bottom is down on the work
surface and its right-side is facing you.
3. Remove the low-voltage power supply: See Figure 6--24, on page 6--40.
a. Remove the two T-15 Torxdrive screws securing the low-voltage power
supply to the right-side chassis support.
b. Remove the three T-15 Torxdrive screws securing the low-voltage power
supply to rear chassis.
Low-Voltage Power
Supply