Keysight 85024A User's And Service Manual page 62

7 Service
Figure 7-3 High frequency probe
3 Connect the probe's power cord to the power source. Turn the power source
4 Refer to
5 If one of these voltages is bad, follow the procedure in
6 Refer to
7 If the three input lines show continuity, desolder the –4 V and +6 V output
62
on.
Figure 7-4. Check the +6 V and –4 V power supply voltages on the
exposed portion of the probe end.
If the voltages are good, suspect an amplifier microcircuit failure. Replace the
amplifier microcircuit and do not perform the following steps.
regulator housing covers"
Figure 7-4. Disconnect the power supply cable and check the
continuity of the three input lines to the A1 regulator assembly. If one of the
wires is broken internally, replace the cable/probe wand assembly.
wires shown in Figure
printed circuit board. If the voltages are good replace the cable/probe wand
assembly. If one of the voltages is bad, troubleshoot the A1 regulator board.
Refer to Figure 7-5 and
schematic diagram, respectively.
on page 67, and continue with the following steps.
7-4. Measure the +6 V and –4 V feedthroughs on the
Figure 7-2 for a component location diagram and
Keysight 85024A User's and Service Guide
"Removing the plastic