Chapter 4 223
Assembly Replacement
A8 Low Band Mixer
Removal
1. Place the spectrum analyzer upside-down on the work bench with
A14 and A15 folded out to the left.
2.
Replacement
1.For analyzers without Option 006: connect AT1 to A8J1.
2. Place A8 on the center deck and attach W56 and W39, using caution
to avoid damaging any of the center conductor pins in the cable.
3. Use two panhead screws to secure A8 to the center deck. Reconnect
W45 to FL1 and A8J1, or AT1.
4. Torque all semirigid coax connections on A8, FL1, and AT1 (if
present) to 113 Ncm (10 in-lb). Ensure that all cable connections are
tight.
5.Connect W15 to A8.
Use a 5/16-inch wrench to remove W45 between FL1 and AT1. (For
Option 006, remove W45 between FL1 and A8J1.)
3. Loosen W47 and W39 at A8J2, and A8J3.
4. Remove the two screws securing A8 to the center deck.
5. Remove W47 and W39 from the A8 assembly.
6. Remove AT1 from A8J1, if present.
7. For analyzers having serial number prefix ≥3641A, or Option H13:
disconnect W15 from A8.
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