HP 8517B - Manual (Page 93)

HP 8517B S-Parameter Test Set Manual 6-9
HP 8517B Test Set Replacement Procedures
Assembly Replacement Procedures
WARNING Electrocution can result if ac power remains connected to the test set during
this procedure. Disconnect the ac power cord before starting.
1. See Figure 6-2 for component locations.
2. Position the test set onto its right-hand side.
3. Using a 5/16-inch open-end wrench, remove the hard-line cables
connected between the coupler A7 and the bulkhead connector J2.
4. Unplug the transformer connector from J2 on the A15 regulator board.
5. Using a large Pozidriv screwdriver, remove the four screws and washers
that hold the transformer onto the rear panel.
6. Using a large Pozidriv screwdriver, remove the screw that holds the
transformer angle bracket to the main deck.
NOTE The transformer wires soldered to the line module are short, so do not pull
the transformer out too far.
7. Carefully remove the transformer from the test set and place it on the
bench near the test set.
8. Strip the heat shrink tubing off the transformer wires that are soldered to
the line module, and de-solder the wires.
9. De-solder the transformer ground wire connected to the chassis side rail.
10. Remove the transformer. When you replace the transformer, refer to
Figure 6-4 for the location of wires connected to the line module.
Figure 6-4 Wire Connections to FL1 Line Module