445
Assembly Replacement Procedures
Top Brace and Reference Bracket
Top Brace and Reference Bracket
Removal
1. Remove the instrument outer case. Refer to the Instrument Outer
Caseremoval procedure.
2. Refer to Figure 14-6. On analyzers with serial prefix < MY/SG/US5233,
both the Top Brace (1) and the Reference Bracket (2) will be present. On
analyzers with serial prefix ≥ MY/SG/US5233 or any analyzer with Option
B85, B1A, or B1X only the Top Brace (1) will be present.
3. To remove the Top Brace, use the T-10 driver to remove the eight screws
(3) (0515-0372) attaching the Top Brace to the chassis. Remove the six
flathead screws (4) (0515-1227) attaching the Top Brace to the A7
Midplane, A14 LO Synthesizer, and A15 Front End Controller assemblies.
Remove the four flathead screws (7) (0515-1227) securing the Top Brace
to either the Reference Bracket or the A16 Reference assembly.
4. If Option BBA is installed, remove the flathead screw (8) (0515-1227)
securing the Top Brace to the BBIQ Main Board.
5. If either Option B85, B1A, or B1X is installed, remove the two flathead
screws (6) (0515-1227) securing the Top Brace to the A25 Wideband
Analog IF and A26 Wideband Digital IF assemblies.
6. To remove the Reference Bracket (2) (if present), use the T-10 driver to
remove the six screws (5) (including two at the rear panel) attaching the
Reference Bracket to the instrument.
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