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Installation Procedure for the Upgrade
Step 5.Remove the A19 Test Set Motherboard
For instructions, click the Chapter 7 bookmark "Removing and Replacing the A19 Test Set
Motherboard" in the PDF Service Guide
Step 6.Remove the A20 IF Multiplexer Board
For instructions, click the Chapter 7 bookmark "Removing and Replacing the A20 IF Multiplexer
Board" in the PDF Service Guide
Step 7.Remove Some Cables
1. Place the analyzer bottom-side up on a flat surface.
2. Remove and discard the following gray flexible cables:
— W150 A20 IF multiplexer (P203) to A12 SPAM (J5)
— W149 A20 IF multiplexer (P603) to A12 SPAM (J2)
3. Remove all bottom-side (test set) semirigid cables except for those in the table below. To see
an image showing the location of these cables, click the Chapter 6 bookmark "Bottom RF
Cables, 2-Port, Option 224" in the PDF Service Guide
some will be reused later in the procedure.
Reference
a
Type
Designator
W3
SR
W9
SR
W45
SR
W46
SR
W47
SR
Option 029 only:
W131
SR
W141
SR
W143
SR
a. SR = semirigid coaxial cable.
13
1
.
1
.
Leave the gray flexible cables, the wire harnesses, and the ribbon cables
connected where possible. Any that are removed should be labeled for
reconnection later.
Be careful not to damage the center pins of the semi-rigid cables. Some
flexing of the cables may be necessary but do not over-bend them.
Qty
Description
1
A5 source 1 to W4
1
A5 source 1 to W10
1
A5 source 1 to W46
1
W46 to rear-panel EXT TSET DRIVE RF OUT (J6)
1
A23 mixer brick to EXT TSET DRIVE LO OUT (J5)
1
Adapter, coax, straight, m-m, 50 ohm
1
A55 noise downconverter to A7 noise receiver board LO
1
A55 noise downconverter to A7 noise receiver board RF
1
. Do not discard the cables because
Installation Note N5242-90017
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