Replacement-part identification is an evidence problem. The goal is to connect a specific equipment configuration to a specific service item and supported revision. Starting from a loose part or a marketplace photo increases ambiguity; starting from the installed system and documented function narrows it.

Key takeaways

  • Capture system, subsystem, label, revision, software, and option context.
  • Separate the suspected fault from the part identity.
  • Confirm compatibility through manufacturer documentation or another accountable technical source.

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1. Identify the complete system

Record manufacturer, marketed system name, exact model, serial number, production date if relevant, software release, installed options, and significant upgrades. Similar model names can span different hardware generations. A serial-number range may determine which assembly was originally installed or which replacement kit applies.

02

2. Identify the service boundary

Describe the component’s function and where it sits in the block diagram. Determine whether the replaceable item is the visible component, a larger FRU, a matched set, or a kit. Service manuals, illustrated parts lists, labels, and manufacturer parts systems may use different names for the same physical area.

03

3. Capture the installed item

Photograph labels, mounting, connector orientation, harness routing, option plugs, daughterboards, firmware labels, and accessories when permitted. Transcribe all numbers exactly. Note whether the part has been replaced before; an installed item may already be a supported supersession rather than the factory-original number.

04

4. Verify the candidate

Compare the orderable number, revision rules, serial-number applicability, software or firmware dependency, mechanical fit, electrical ratings, connectors, included accessories, calibration needs, and return-to-service instructions. Preserve the evidence supporting the decision in the equipment record or purchasing documentation.

Related terminology

Terms with a published definition link directly to the glossary.

FRUpart numberrevisionsupersessionconfigurationtraceability