HP 8517B manual Fan Assembly Replacement, B1 Fan Assembly, T1 Power Transformer

Fan Assembly Replacement

WARNING

NOTE

HP 8517B Test Set Replacement Procedures

Assembly Replacement Procedures

B1 Fan Assembly

Turn off the test set and disconnect the power cord from the ac-power mains.

Electrocution can result if ac power remains connected to the test set during this procedure. Disconnect the ac power cord before starting.

To replace the B1 fan assembly, remove T1 transformer to expose the ends of the fan wires which must be de-soldered from the line module, FL1. Refer to Chapter 7, “Replaceable Parts” in this manual for a detailed view of the fan and transformer hardware.

1.See Figure 6-2for component locations.

2.Position the test set on its right-hand side.

3.Using a 5/16-inch open-end wrench, remove the hard-line cables connected between the couplers A7 and A9 and the bulkhead connectors J2 and J5.

4.Unplug the transformer connector at 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.

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 two fan wires, then de-solder the wires from the line module. Cut any cable ties restraining the fan wires.

9.Using a small Pozidriv screwdriver, remove the screw and lockwasher that secure the green/yellow fan ground wire to the top of the rear panel frame.

10.Using a small Pozidriv screwdriver, remove the four screws that hold the fan to the rear panel. Remove the fan assembly.

Power Transformer	T1 Power Transformer
Replacement	Turn off the test set and disconnect the power cord from the mains.

6-8HP 8517B S-Parameter Test Set Manual