Agilent Technologies 3458A Repair Manual page 42

Installation Procedure
42 Chapter 3 Disassembly/Assembly Procedures and Parts List
2. Set the 3458A on your workbench with the top facing you.
3. Unplug the following wires and cables. Unless otherwise noted, all
wires and cables are unplugged from the DC Circuitry assembly.
a. Blue wire from the metal inguard shield. This wire is not plugged
into the DC Circuitry assembly, but must be unplugged to remove
the assembly. Move the wire out of the way.
b. Grey wire from the metal inguard circuit ground. This wire is not
plugged into the DC Circuitry assembly, but must be unplugged to
remove the assembly. Move the wire out of the way.
c. Yellow wire from P202. Move the wire out of the way.
d. Orange wire from P7. Move the wire out of the way.
e. Grey wire from P6. Move the wire out of the way.
f. Black and white wires from P8 and P9, respectively. The black and
white wires form a white cable. Move the cable out of the way.
g. Grey 20 pin cable from P3. Move the cable out of the way.
4. Use the #TX 10 Torx driver to remove the two screws from the
DC Reference assembly.
5. Use the #TX10 Torx driver to remove the eight screws from the
DC Circuitry assembly.
6. Use the plastic board extractor on the DC Circuitry board to unplug
the board from the inguard chassis. Then completely remove the
board.
1. Line up the DC Circuitry board with the connector in the inguard
chassis. Plug the board into the connector.
2. Use the #TX10 Torx driver to install the eight screws on the
DC Circuitry assembly.
3. Use the #TX10 Torx driver to install the two screws on the
DC Reference assembly.
4. Plug in the following wires and cables:
a. Locate the blue wire connected to the power transformer. Plug the
wire into the metal inguard shield.
b. Locate the grey wire connected to the power transformer. Plug the
wire into the metal inguard circuit ground.