14-18 Service Guide
Assembly Replacement and Post-Repair Procedures HP 8719ET/20ET/22ET
Removing the Source Assemblies HP 8719ES/20ES/22ES
RF Network Analyzers
Removing the Source Assemblies
Tools Required
• T-15 TORX screwdriver
• 5/16-inch open-end torque wrench (set to 10 in-lb)
• ESD (electrostatic discharge) grounding wrist strap
Start Removal
1. Disconnect the power cord and remove the top cover, refer to “Removing the Covers” on
page 14-6.
2. Remove the front panel (refer to “Removing the Front Panel Assembly” in this chapter).
3. Remove the source module cover.
A58 M/A/D/S Removal
4. Disconnect the cables (item 1) and (item 2 for all but Option 400) from the M/A/D/S.
5. Remove the 4 screws (item 3) from each corner of the assembly.
Oscillator Removal
6. Remove the 3 screws (item 4) that attach the source module to the analyzer.
7. Disconnect the cables (item 1) and (item 2 for all but Option 400) from the M/A/D/S.
8. Remove the 4 screws (item 5) and (item 6) from the source module bracket. Remove the
bracket.
9. Lift the source module out of the analyzer.
10.Remove a screw (item 7) from the back of the oscillator.
11.Disconnect attaching RF cables.
A59 Source Interface Board Removal
12.Remove the 3 screws (item 4) that attach the source module to the analyzer.
13.Disconnect the cables (item 2) and (item 3 for all but Option 400) from the M/A/D/S.
14.Remove the 4 screws (item 4) and (item 5) from the source module bracket. Remove the
bracket.
15.Lift the source module out of the analyzer.
16.Remove 3 screws to detach the bottom source module cover.
17.Remove 4 screws that attach the source control board to the source module frame.
18.Place one hand on the top of the A59 board, with your thumb near the A58 M/A/D/S, to
push the board. Place your other hand on the bottom side of the A59, with your thumb
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