3 Disassembly/Assembly Procedures and Parts List
80 Keysight 3458A Assembly-Level Repair Manual
AC converter assembly removal/installation procedures
The following procedures show how to remove and install the AC Converter
Printed Circuit Board Assembly.
Refer to Figure 3-10 for the following procedures.
Removal procedure
1 Use the Covers removal procedure in this section of the manual to remove the
3458A bottom cover and bottom shield. It is not necessary to remove the top
cover and top shield.
2 Set the 3458A on your workbench with the bottom facing you.
3 Unplug the gray 20-pin cable from the AC Converter assembly.
4 Unplug the black striped white wire from the metal inguard chassis.
5 For easier removal of the AC Converter assembly, you may wish to unplug and
lay aside both the blue and gray fiber optic cables connecting the A/D
Converter and Inguard Logic assembly to the outguard.
6 Remove the pushrod from the Guard switch. You may need to pry the pushrod
loose with a small flat blade screwdriver. Then completely remove it from the
rear of the front panel.
7 Use the #TX10 Torx driver to remove the four screws from the AC Converter
assembly.
8 Unplug and remove the AC Converter board from the inguard chassis.
Installation procedure
1 Line up the AC Converter board with the connector in the inguard chassis.
Then plug the board all the way into the connector.
2 Use the #TX 10 Torx driver to install the four screws on the AC Converter
assembly.
3 Locate the gray 20-pin cable connected to the Inguard Power Supply
assembly. Line up the cable plug with the socket on the AC Converter
assembly. Then plug the cable all the way in.
4 Plug the black striped white wire from the AC Converter into the metal inguard
chassis.
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