Disassembly/Assembly Procedures and Parts List 3
Keysight 3458A Assembly-Level Repair Manual 77
c Locate the yellow wire connected to the Front/Rear Switch assembly. Plug
it into P202 on the DC Circuitry assembly.
d Locate the orange wire connected to the Front/Rear Switch assembly. Plug
it into P7 on the DC Circuitry assembly.
e Locate the gray wire connected to the Front/Rear Switch assembly. Plug it
into P6 on the DC Circuitry assembly.
f Locate the white cable with the white and black wires connected to the
Front/Rear Switch assembly. Plug the white and black wires into P8 and
P9, respectively. P8 and P9 are on the DC Circuitry assembly.
g Locate the gray 20-pin cable connected to the A/D Converter and Inguard
Logic assembly. Line up the cable plug with socket P3 on the DC Circuitry
assembly. Then plug the cable all the way in.
5 Use the Covers installation procedure in this section of the manual to install
the 3458A top cover and top shield.
DC reference assembly removal/installation procedures
The following procedures show how to remove and install the DC Reference
Printed Circuit Board Assembly.
Refer to Figure 3-9 for the following procedures.
Removal procedure
1 Use the Covers removal procedure in this section of the manual to remove the
3458A top cover and top shield. It is not necessary to remove the bottom cover
and bottom shield.
2 Set the 3458A on your workbench with the top facing you.
3 Use the #TX10 Torx driver to remove the two screws from the
DC Reference assembly.
4 Unplug and remove the board from the DC Circuitry assembly.
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