10 Installation Note E4406-90278
Installation Procedure
Step 7. Install the replacement A22 CPU Assembly and A25 SCSI Assembly
1. Slide the CPU assembly back into the chassis and assure the CPU and motherboard connector
mate. The CPU plate should fit snugly against the rear frame.
2. Install the Digital IF (A10) assembly into slot 4. Assure the cables are not pinched when the
assembly is inserted. Hook the ejectors under the tabs on the rear frame and mid web. Carefully
push down on the ejectors to mate the assembly with the motherboard connectors.
NOTE If the Digital IF (A10) assembly is not snugly installed so that it mates well with
the mother board and CPU board, the instrument will not function correctly when
turned on. If the instrument reports a serial number of “0” after completing this
retrofit and does not align correctly, you must re-seat the Digital IF so that it mates
properly with the motherboard and CPU assembly. If a problem persists with not
being able to correctly insert the Digital IF assembly, remove the CPU rear plate
and install the CPU board, then install the Digital IF, then re-attach the CPU plate.
3. Install the Base band I/Q (A7) assembly (if present) into the slot that it was originally installed
(either slot 1 or slot 2). Assure the cables are not pinched when the assembly is inserted. Ensure
that the Base band I/Q assembly mates snugly with the mother board assembly and CPU assembly.
4. Install the replacement SCSI board by inserting it into the opening on the rear frame. Carefully
position the board in the CPU board connector and push down to mate. Replace the 6 screws using
a T-10 driver. Torque to 9 inch pounds.
5. Using the T-10 driver, secure the CPU assembly to the rear frame with the 14 screws. Torque to 9
inch pounds.
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