Installation guide

Assembly Replacement
A20 Downconverter (Option 501, 502, 503, 504 with Option 300)
2-48
A20 Downconverter (Option 501, 502, 503, 504 with Option 300)
Tools Required
• T-10 driver
• needle-nose pliers
Removal Procedure
Refer to Figure 2-24 for this procedure.
1. Disconnect the power cord.
2. Remove the outer and inner covers. Refer to “Outer and Inner Instrument Covers” on page 2-4.
3. Using needle-nose pliers, disconnect the following cables
from the A20 Downconverter (Option 501, 502, 503, 504 with Option 300):
•W64
•W13
•W14
4. Disconnect the W63 ribbon cable from A23J19.
5. Using the T-10 driver, remove the two screws (1) from the hook bracket that are holding
the A20 Downconverter (Option 501, 502, 503, 504 with Option 300) to the chassis.
6. Tilt the hook bracket away from the chassis and slide out the tabs from the slots.
The hook bracket has two hinged tabs at the bottom that fit into slots in the signal generator’s chassis.
7. Using the T-10 driver, remove the four screws (2) that hold the hook bracket to
the A20 Downconverter (Option 501, 502, 503, 504 with Option 300).
8. Remove the A20 Downconverter (Option 501, 502, 503, 504 with Option 300).
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Torque all T-10 screws to 9 in-lbs.
3. Perform the post-repair adjustments and performance tests that pertain to this removal procedure.