Chapter 7 329
Replacing Major Assemblies
A15 Motherboard and IF Extrusion
28.Replace the 40 screws (7) that secure the IF board assemblies to the
IF extrusion.
29.Connect the B1 Fan wire harness (6) to A15J19 at the rear of the
motherboard.
30.Connect the W19 coaxial cable (5) on A15J18 at the rear of the
motherboard.
31.Replace the two screws and flat washers (4) on the front-end-to-IF
support bracket. See Figure 7-12.
32.Replace the rear frame. Refer to the “Rear-Frame Assembly.”
replacement procedure.
33.Replace the A7 Analog Board assembly. Refer to the “A7 Analog
Interface Assembly.” replacement procedure.
34.Replace W7, W8, W9, and W21 (1) on the A9 Third Converter.
35.If the instrument is equipped with card-cage options:
• Replace the option assemblies in the card-cage slot that theywere
removed from.
• Connect all option cables and wire harnesses as noted in the
removal procedure.
• Replace all cable ties as noted in the removal procedure.
• Position all wiring and cables so that they do not interfere with
the installation of the instrument cover.
36.Replace the A8 Power Supply. Refer to the “A8 Power Supply.”
replacement procedure.
37.Replace the instrument cover assembly. Refer to the “Instrument
Cover.” replacement procedure.
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