Replacing The Power Supply - Agilent Technologies 53150A Service Manual

Chapter 3 Replacing Assemblies

Replacing the Power Supply

Replacing the Power Supply
Use the following procedure to replace the power-supply circuit board:
1 Remove the shroud (see "Removing the Shroud" on page 3-8).
2 Disconnect the two power-supply connectors (one at the front and one at
the rear of the power supply).
3 Use a #1 Phillips screwdriver to remove the two pan-head screws and the
two star washers that fasten the perforated power-supply cover to the
power-supply chassis. The screws are accessible through the rectangular
cutout in the side of the Counter's chassis.
4 Use a small flat-bladed screwdriver to pry the power-supply cover toward
the opening in the chassis to loosen it from the chassis.
5 Remove the power-supply cover by sliding it through the rectangular
opening in the side of the counter's chassis.
¼
6 Use a -inch nut driver to remove the two nuts used to fasten the circuit
board to the power-supply chassis. You may have to hold the screws to
prevent them from turning while removing the nuts. Do not discard the
nuts, lock washers,
7 Remove the two flat-head screws that are on both sides of the power-
supply nameplate.
8 Lift the circuit board up until it clears the power-supply cover mounting
tabs, and remove it from the chassis. Discard the defective circuit board.
9 Disassemble the replacement power supply in the same manner as
described in steps 3 through 8.
10 Insert the circuit board from the new power supply into position in the
power-supply chassis inside the Counter.
3-16
¼
-inch spacers, and 5/8-inch flat-head screws.
Assembly Level Service Guide