HP 8517B manual This procedure. Disconnect the ac power cord before starting

		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 6-2for 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 6-4for the location of wires connected to the line module.

Figure 6-4 Wire Connections to FL1 Line Module

HP 8517B S-Parameter Test Set Manual 6-9