Chapter 4 227
Assembly Replacement
A10/A12 RYTHM/SBTX
A10/A12 RYTHM/SBTX
Removal
CAUTION Do NOT remove the brackets from the A10/A12 assembly. If these
brackets are removed and reinstalled, the performance of the spectrum
analyzer will be altered. A new or rebuilt A10/A12 assembly includes
new mounting brackets already attached to it.
1. Disconnect W16 ribbon cable from the A10/A12 assembly.
2. Use a 5/16-inch wrench to remove W43, W44, W46, and W47 from
the A10/A12 assembly. See Figure 4-20 on page 221.
3. Remove W56/FL2/W57 (as a unit) and set it aside.
4. Remove W28 from the A10/A12 assembly (beneath where
W56/FL2/W57 was connected to the A10/A12 assembly).
5. Remove four screws (1) securing A10/A12 to the center deck. These
screws are located on the top-side of the center deck as illustrated in
Figure 4-22, “A9 and A10/A12 Mounting Screws.”
6. Carefully remove the A10/A12 assembly and disconnect W48 (gray
cable).
Replacement
1. Orient the A10/A12 assembly for the proper cable connections.
2. Connect W48 (gray cable) to the A10/A12 assembly (beneath where
W46 connects to the A10/A12 assembly). See Figure 4-20 on page
221.
3. Connect W28 to the A10/A12 assembly (beneath where W56
connects to the A10/A12 assembly). See Figure 4-20 on page 221.
4. Connect W43, W44, W46, and W47 to the A10/A12 assembly.
5. Connect W16 ribbon cable to the A10/A12 assembly.
6. Install W56/FL2/W57 and torque all RF cable connections to
113 Ncm (10 in-lb).
7. Secure the A10/A12 assembly to the spectrum analyzer center deck
using four screws.
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