44 Chapter 3 Disassembly/Assembly Procedures and Parts List
e. Locate the grey 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 grey 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 14 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.
Installation Procedure 1. A top and bottom cover needs to be installed over the reference device
located on the DC Reference assembly. To install the covers, place
one cover over the top of the device and another on the bottom side of
the DC Reference assembly printed circuit board. Use your fingers to
hold the covers in place. Then line up the screw holes in the covers
with the screw holes on the printed circuit board. The covers should
now completely enclose the reference device.
2. Line up the DC Reference board with the connectors on the
DC Circuitry assembly. Hold the covers over the reference device in
place while installing the DC Reference assembly. Then plug the
board all the way into the connectors.
3. Use the #TX10 Torx driver to install the two screws on the
DC Reference assembly.
4. Use the Covers Installation Procedure in this section of the manual to
install the 3458A top cover and top shield.
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