Disassembly/Assembly Procedures and Parts List 3
Keysight 3458A Assembly-Level Repair Manual 81
5 Plug in both the blue and gray fiber optic cables into the A/D Converter and
Inguard Logic assembly, if previously unplugged.
6 Guide the Guard switch pushrod through the rear of the front panel's access
hole. Then align the pushrod with the Guard switch shaft and push it all the
way onto the shaft.
7 Use the Covers installation procedure in this section of the manual to install
the 3458A bottom cover and bottom shield.
A/D converter assembly removal/installation procedures
The following procedures show how to remove and install the A/D Converter and
Inguard Logic Printed Circuit Board Assembly.
Refer to Figure 3-11 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 Locate the gray 20-pin cable that connects the A/D Converter and Inguard
Logic assembly to the Inguard Power Supply assembly. Unplug this cable at
the A/D Converter and Inguard Logic assembly.
4 Locate the gray 20-pin cable that connects the A/D Converter and Inguard
Logic assembly to the DC Circuitry assembly. Unplug this cable at the A/D
Converter and Inguard Logic assembly.
5 Unplug both sets (four cables) of the blue and gray fiber optic cables that
connect the A/D Converter and Inguard Logic assembly to the Outguard
Power Supply assembly.
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