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Step 4. Remove the Front Panel Assembly
For instructions, click the Chapter 7 bookmark "Removing and Replacing the Front Panel
Assembly" in the PDF Service Guide
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 222" 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
Installation Note N5242-90123
1
.
1
.
1
.
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.
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.
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
Installation Procedure for the Upgrade
1
. Do not discard the cables because
14
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