7Service
60 Keysight 85024A User’s and Service Guide
Troubleshooting Procedures
Mechanical failure of the protective sleeve
The probe wand/cable must be replaced if the protective sleeve fails to slide and
lock properly.
Electrical failure of the probe
Visually inspect the probe tip
Inspect the probe tip for damage. If it is bent or broken, replace it by referring to
“Replacing the probe tip” on page 65. Perform the “Operator’s Check” on page 34.
If the problem persists, perform the following procedure.
Power supply check
Refer to the probe schematic in Figure 7-2, “A1 regulator schematic diagram and
overall block diagram” on page 61 when performing the following procedure.
1 Check the probe power output from the supplying instrument or power supply.
The output pins and voltages are shown in Figure 7-4, “Power supply check
points” on page 63. Check continuity of the ground pin to chassis ground; it
should be less than 1 W.
– If the supplies are within the tolerances given in “Power requirements” on
page 29 continue to step 2.
– If the voltage is not present at the supplying device, or the ground pin is
open, troubleshoot as required. Suspect a broken wire going to the probe
power jack.
The probe contains an input GaAs amplifier microcircuit that is highly
sensitive to electrostatic discharge (ESD). When repairing this probe, you
must use an anti-static wrist strap, and work at a station equipped with an
anti-static surface! Before you take a measurement with a digital
multimeter, discharge the leads by touching them to ground.
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