Regulator Board Replacement
Filter Capacitor Replacement
HP 8517B Test Set Replacement Procedures
Assembly Replacement Procedures
6.Unplug the four harnessed
7.Lift the frequency converter out of the test set.
8.Remove the frequency converter bracket by removing the two Pozidriv screws.
A15 Regulator Board Assembly
1.See Figure
2.Unplug the transformer socket from the regulator board.
3.Unplug the amplifier socket from the regulator board (only in Options 007, Option 002 “plus” 007, and Option 004 “plus” 007).
4.Remove the three mounting screws from the top edge of the regulator board.
5.Remove the regulator board. (You may need to partially back out one of the transformer mounting screws for clearance.)
C1 to C4 Filter Capacitors
1.With the test set in an upright position, pull the metal and plastic cover off the 4 capacitors. See Figure
2.Turn the test set over and remove the bottom cover.
3.To discharge the capacitors, do the following:
a.Attach one end of an insulated clip lead to the chassis of the instrument.
b.Attach the other end of the clip lead to a 100 Þ Ω
c.Use the resistor to discharge each capacitor terminal (the large Pozidriv screw on the bottom side of the test set). Each capacitor has two terminals.
d.Discharge all capacitor terminals. It takes approximately six seconds per capacitor to discharge.
4.To remove a capacitor, remove the corresponding pair of screws and pull the capacitor out of the test set.