Service 2
Keysight 53210A/53220A/53230A Assembly Level Service Guide 155
After service considerations
Product safety checks
The following safety checks should be performed after any troubleshooting and
repair procedures have been completed to ensure the safe operation of the
instrument.
1 VISUAL INSPECTION. Visually inspect the interior of the instrument for any
signs of abnormal internally generated heat, such as discolored printed circuit
boards or components, damaged insulation, or evidence of arcing. Determine
and remedy the cause of any such condition.
2 GROUND CONTINUITY TEST. Plug the power cord into the rear-panel power
receptacle. (DO NOT connect the instrument to AC power at this time.) Using a
suitable ohmmeter or digital multimeter (DMM), check the resistance from the
instrument’s metallic connection (such as the rear panel or BNC ground collar)
to the ground pin on the power cord plug. The reading must be less than 1Ω.
Flex the power cord while making this measurement to determine whether
intermittent discontinuities exist.
3 Check any indicated front- or rear-panel ground terminals marked, using the
above procedure.
Resistance checks described in the following text require that the power
cord be connected to the instrument and that AC power be disconnected. Be
sure that the power cord is not connected to power before performing any
safety checks.
INSULATION RESISTANCE TEST. Tie the line and neutral pins of the power cord
plug together. Measure the resistance from the instrument enclosure (chassis) to
the line and neutral pins of the power cord. The minimum acceptable resistance
is 2 MΩ. Replace any component which results in a failure.
Table 2-5, Figure 2-9 and Figure 2-10 show the replaceable assemblies in the
Keysight 53210A/53220A/53230A. Refer also to Chapter 5, "Replaceable Parts"
for other part numbers.
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