Installation Note N5222-90129
17
Installation Procedure for the Upgrade
Step 2. Remove the Outer Cover
For instructions, click the Chapter 7 bookmark “Removing the Covers” in the
PDF Service Guide
1
.
Step 3. Remove the Inner Cover
7.
For instructions, click the Chapter 7 bookmark “Removing the Covers” in
the PDF Service Guide
Step 4. Remove the Front Panel Assembly
8.
For instructions, click the Chapter 7 bookmark “Removing and Replacing
the Front Panel Assembly” in the PDF Service Guide
.
Step 5. Remove the A23 Test Set Motherboard
9.
For instructions, click the Chapter 7 bookmark “Removing and Replacing
the A23 test set motherboard” in the PDF Service Guide
Step 6. Remove Some Bottom-Side (Test Set) Cables
1. Place the analyzer bottom-side up on a flat surface.
2. Remove the following cables. To see an image showing the location of
these cables, click the Chapter 6 bookmark “Bottom RF Cables, Standard
2-Port Configuration, Option 217
, S/N Prefix
≥
6021
” in the PDF Service
Guide
These cables may be discarded - they will not be reinstalled.
—W
70
(N5222-20073) A21 HMA26.5 to A23 mixer brick
—W48 (N5222-20003) A33 reference mixer switch to A23 mixer brick (R1)
—W12 (N5222-20068) A29 port 1 coupler to front-panel Port 1 CPLR THRU
1. See
“Downloading the Online PNA Service Guide” on page 7
Be careful not to damage the center pins of the semirigid 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.
Remove and save the cable guards for the front panel jumpers.
When removing a cable, also remove the plastic cable clamp, if present. It
is normal for some of the cable clamp’s adhesive to remain.