Chapter 7 333
Replacing Major Assemblies
A16 Processor/Video Board and A16A1 Memory Board Assembly
Replacement
CAUTION To prevent damage to connectors A16J1 and A15J2, make sure that
they are mated correctly before pushing the A16 assembly into place.
Avoid twisting the A16 assembly from side to side during installation.
1. Replace the A16 processor/video board assembly.
2. Place two screws in the mounting holes by J5 and J7. Align the A16
board as far toward the rear panel as it will go.
3. Replace the remaining five screws (6) that secure the A16 assembly.
See Figure 7-14.
4. If the instrument is equipped with Option 041 or 043:
• Replace the A40 or A41 IO board assembly (5).
• Replace the four screws (4) that secure the A40 or A41 IO board
assembly.
5. Replace the A25 counter-lock assembly (3).
6. Replace the four screws (2) that secure the A25 assembly.
7. Connect the W14 ribbon cable (1) to A16J2 and A25J4.
CAUTION To prevent cable and wire damage, ensure all wiring is routed to one
side of the SMB connector, A15J18, and through the notch located on
the rear edge of the A15 motherboard.
8. Replace the rear-frame assembly.
9. Install the IO connector through the rear panel into the IO board
and replace the five screws securing the IO connector to the IO
board.
10.Replace the instrument cover assembly. Refer to the “Instrument
Cover.” replacement procedure.
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