Circuit Card Academy
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Repair Traveler

Circuit card assembly — diagnosis & repair record

Circuit Card Academy

1 · Incoming failure (ATE / squawk)

Test / stepDevice / netMeasuredLimit (spec)P/F

The ticket tells you where to look, not always what is wrong — a flagged part may really be a cracked joint, a fixture pin, or a neighbor loading the net. Verify before replacing.

2 · Visual inspection (under magnification)

Burns / discoloration / odor
Bulged / vented / leaking capacitors
Cracked MLCC / tantalum
Cracked / cold / lifted solder joints
Connector pins — bent / recessed / corroded
FOD / solder balls / debris
Conformal coat damage / prior rework
Missing / wrong / reversed parts (vs assy dwg)

Findings / location:

3 · Power-on & rail measurements — current-limited supply

Rail / netTest pointExpected (per spec)MeasuredP/F
Input

Expected values are intentionally blank. Fill them per board from your own authorized documentation (test spec / ATP / golden-board sheet / BOM for this revision). Supply current at power-on: (vs expected ___ — high = short/latch-up, near-zero = not starting).

4 · Heartbeat — clock / reset / activity (digital)

CheckExpectedObserved
Oscillator / clock
Reset releases
Bus / activity

5 · Diagnosis

Symptom → hypothesis → isolating measurement (half-split / golden-board comparison):

6 · Repair action

Ref desPart removed (P/N)Part installed (P/N · lot)Procedure (IPC-7711/7721)
Cleaned per process
Conformal coat restored & cured

7 · Root cause

Why did it fail? (A victim part needs its cause found before re-power.)

8 · Verification

Failing test re-run — PASS
Full acceptance test (ATP) — PASS

Circuit Card Academy · Repair Traveler template. This is generic training scaffolding — follow your facility’s controlled traveler, process specs, and traceability requirements for flight hardware.