Surface Mount Repair; Disassembly And Reassembly Specifics; After Service Considerations; Product Safety Checks - Agilent Technologies 53150A Service Manual

WARNING
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Chapter 2 Service
Pre-Troubleshooting Information

Surface Mount Repair

None of the assemblies in the Counter that use surface-mount components
can be repaired outside of authorized Agilent Service Centers. Any attempt to
repair these assemblies voids the Agilent factory warranty and makes the
assemblies ineligible for return credit.

Disassembly and Reassembly Specifics

Refer to Chapter 3 of this guide, "Replacing Assemblies," for complete
disassembly and reassembly instructions, and Chapter 4, "Replaceable
Parts," for an exploded view of the instrument's parts.

After Service Considerations

Product Safety Checks

The following safety checks must be performed after any troubleshooting
and repair procedures have been completed to ensure the safe operation of
the instrument.
THE 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 AN AC POWER
SOURCE BEFORE PERFORMING ANY SAFETY CHECKS.
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.
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, check 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.
2-10 Assembly Level Service Guide