Installation guide

Assembly Replacement
A9 Digital Demodulator (Option 501, 502, 503, 504 with Option 300)
2-24
A9 Digital Demodulator (Option 501, 502, 503, 504 with Option 300)
Tools Required
• needle-nose pliers
Removal Procedure
Refer to Figure 2-12 for this procedure and to the connector/cable diagram located on the card cage.
1. Disconnect the power cord.
2. Remove the outer cover. Refer to “Outer and Inner Instrument Covers” on page 2-4.
3. Using needle-nose pliers, disconnect the following cables:
• W13 cable from A9J4
• W14 cable from A9J5
• W12 cable from A7J800.
(This is W78 on an Option 1EM.)
4. Disconnect W10 from A7J13 and A9J3.
5. Locate Top-SLOT 2, lift the retention levers, and disconnect the A9 Digital Demodulator
(Option 501, 502, 503, 504 with Option 300) from the A23 Motherboard.
6. Lift out the A9 Digital Demodulator (Option 501, 502, 503, 504 with Option 300).
Replacement Procedure
1. Reverse the order of the removal procedure.
2. Perform the post-repair adjustments and performance tests that pertain to this removal procedure.