Replacement - Agilent Technologies 8564EC Service Manual

4. Disconnect W30 from A7 and move this cable/filter out of the way.
5. Remove the three screws (2) securing the A9 input attenuator
mounting bracket to the center deck. See
6. Loosen W43 from the attenuator connector, then disconnect the
other end of W43 from A12J3 with a slight downward pressure to
prevent damage to the center conductor pin.
7. Disconnect W41 from the front panel INPUT 50Ω connector,
swinging the attenuator assembly upward to free the connection.
8. Remove the attenuator and disconnect the attenuator ribbon cable
(W11), and the 2 semirigid coax cables (W41 and W43).
9. Remove the attenuator from the attenuator mounting bracket.

Replacement

1. Ensure that the bracket that secures the attenuator to the center
deck is attached to the attenuator. For proper orientation of the
attenuator when mounting the bracket, refer to
chapter 5.
2. Connect the attenuator-control ribbon cable to the A9 input
attenuator.
3. Loosely connect semirigid cable W43 to the attenuator assembly. See
Figure 4-21 on page
4. Loosely connect semirigid cable W41 to the front panel RF INPUT
connector.
5. Loosely connect the other end of W41 to the attenuator and swing
the attenuator down into place.
6. Connect semirigid cable W43 to A12J3 and torque all semirigid cable
connections to 113 Ncm (10 in-lb).
7. Attach the attenuator to the center deck with three panhead screws
(2). See Figure 4-22 on page
8. Connect W30 to A7 and attach FL3 to the attenuator mounting
bracket using a small cable clamp and one panhead screw (1). See
Figure 4-21 on page
113 Ncm (10 in-lb).
9. Connect W16 ribbon cable to the A10/A12 assembly.
Chapter 4
224.
226.
224. Torque the connections to W30 and FL3 to
Assembly Replacement
A9 Input Attenuator
Figure 4-22 on page
Figure 5-4 in
226.
225