Agilent Technologies 53150A Service Manual page 82

Chapter 3 Replacing Assemblies
Replacing the Power Supply
11 Insert the two screws removed in step 7 into the holes on both sides of the
power-supply nameplate. Do not tighten these screws at this time.
12 Use a pair of needle-nose pliers to position one of the
removed in step 6 between the circuit board and the power-supply chassis,
and align the spacer with the mounting holes in the circuit board and the
chassis.
13 Insert one of the 5/8-inch, flat-head screws removed in step 6 up through
the circuit-board mounting hole in the bottom of the power-supply chassis,
through the spacer, and through the hole in the circuit board.
14 Place a lockwasher over the screw on top of the circuit board.
15 Thread a nut onto the screw, but do not tighten it fully at this time.
16 Repeat steps 12 through 15 for the other circuit-board mounting hole.
17 Tighten the two screws next to the power-supply nameplate.
18 Tighten the nuts on the circuit-board mounting screws.
19 Insert the power-supply cover through the rectangular hole in the side of
the counter's chassis, and position in properly on the power-supply.
20 Insert the two screws that fasten the power-supply cover to the chassis
and tighten them.
21 Reconnect the two power-supply connectors and the front and rear ends of
the power supply.
22 Turn the Counter on, and perform the "Power Supply Check" procedure on
page 2-13.
23 If necessary, adjust the +5 VDC output of the power supply using the
procedure titled "Adjusting the +5 VDC Output" on page 2-14.
24 Reassemble the Counter.
Assembly Level Service Guide
¼
-inch spacers
3-17