Keysight 85024A User's And Service Manual

Contents

Keysight 85024A User's And Service Manual Manual pdf 60 page image

7 Service60 Keysight 85024A User’s and Service GuideTroubleshooting ProceduresMechanical failure of the protective sleeveThe probe wand/cable must be replaced if the protective sleeve fails to slide andlock properly.Electrical failure of the probeVisually inspect the probe tipInspect 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 checkRefer to the probe schematic in Figure 7-2, “A1 regulator schematic diagram andoverall 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 checkpoints” on page 63. Check continuity of the ground pin to chassis ground; itshould be less than 1 W.– If the supplies are within the tolerances given in “Power requirements” onpage 29 continue to step 2.– If the voltage is not present at the supplying device, or the ground pin isopen, troubleshoot as required. Suspect a broken wire going to the probepower jack.CAUTION The probe contains an input GaAs amplifier microcircuit that is highlysensitive to electrostatic discharge (ESD). When repairing this probe, youmust use an anti-static wrist strap, and work at a station equipped with ananti-static surface! Before you take a measurement with a digitalmultimeter, discharge the leads by touching them to ground.