Agilent Technologies 8590 Series Service Manual page 316

Replacing Major Assemblies
A3 Front-End Assembly
Replacement
1. Tuck all cables and wire harnesses on the A3 Front-End assembly
2. Place the instrument on the work surface with the top side facing up.
3. Set the front-end assembly on top of the A2 Display assembly and
4. Position the front-end assembly over the front-end section of the
Protect the center pin of the W10 semi-rigid cable and make sure that
CAUTION
cables W20 and W24, as well as all other wiring, are not pinched
between the front-end assembly and the instrument.
5. Carefully lower the front-end assembly into the instrument chassis.
6. Replace the front-end-to-IF support bracket, and install the three
7. Connect W8 (1) to A9J5 and W9 (2) to A9J4. See
8. If the instrument came equipped with an LO Output on the rear
9. Place the instrument so that its left side is resting on the work
10.Install and tighten the four screws (3) that secure the front-end
11.Route W20 through the slot (2) in the instrument chassis and under
12.Connect W20 (1) to the AT1 assembly and tighten it to
13.Place the instrument on the work surface with the top side facing
14.Tighten the three screws (4) on the front-end-to-IF support bracket.
15.Replace the A7 Analog Board assembly. Refer to the
316
(except for cables W20 and W24) down into the space (5) between
the "D" bracket and the A3A9 filter. This reduces the possibility of
damaging wires while replacing the front-end assembly. See
Figure 7-8.
route the W20 coaxial cable into the slot on the instrument chassis
that is just below the lower-right rear corner of the A2 Display
assembly.
instrument chassis.
screws and two washers (4) on the bracket without tightening.
panel (Option 009), connect W42 (3) to the LO OUTPUT connector
on the rear-frame assembly.
surface.
assembly to the chassis. See
the ribbon cable.
10 inch-pounds.
up.
See Figure 7-8.
Interface Assembly."
Figure 7-7.
replacement procedure.
Figure 7-8.
"A7 Analog
Chapter 7