200 Chapter 8
Hardware Options
Overview and Verification of Option 123, Microwave and Millimeter Preselector Bypass
Troubleshooting Hints
1. Place the instrument on a table. Remove the screws that hold the
instrument front frame to the chassis so the front frame can be
dropped to expose the circuitry behind the front frame. Refer to the
instructions for dropping the front frame on page 314. Do not
remove and front panel cables since the front frame must remain
functional.
2. Run
Align All Now, then turn Auto Align OFF. This will allow you to
remove cables and troubleshoot without having Auto Align run
unexpectedly and change your measured results.
3. Signal path troubleshooting requires connection to devices with 2.4
mm connectors. A short semi-rigid cable with 2.4 mm male
connectors on both ends is recommended. The Required Test
Equipment list on page 24 contains the Agilent part number of a
cable that can be modified (bent) and used for this purpose.
4. Other items required include:
• TORX #10 driver
• 5/16-inch wrenches (2 required)
• 1/4-inch wrench
• Cable, 2.4 mm (m) to 2.4 mm (m) or (f), 1 meter (2 required)
• assorted 2.4 mm adapters
Refer to the E4446A, 47A, 48A Option 110 and Option 123 block
diagram for interconnection and signal level information.
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