14-20
Service Guide
Assembly Replacement and Post-Repair Procedures
HP 8719ET/20ET/22ET
Removing the A7 CPU Board Assembly
HP 8719ES/20ES/22ES
RF Network Analyzers
Removing the A7 CPU Board Assembly
Tools Required
• T-10 TORX screwdriver
• ESD (electrostatic discharge) grounding wrist strap
Removal
1. Disconnect the power cord.
2. Remove the 4 bottom feet and bottom cover, refer to
“Removing the Covers” on
page 14-6
.
3. Remove the 4 screws (item 1) on the rear panel.
4. Turn the analyzer over and remove the screw (item 2) that secures the CPU board to
the deck.
5. Disconnect the ribbon cable (item 3).
6. Disconnect the ribbon cable (item 4) from the CPU board.
7. Slide the board towards the front of the instrument so that it disconnects from the 3
standoffs (item 5).
8. Disconnect the ribbon attached at the rear of the CPU board.
9. Lift the board off of the standoffs.
Replacement
1. Reverse the order of the removal procedure.
