6. Diagnosis & Service

TTJ3C / TTJ4C :: DIAGNOSIS

Concern to cause

Start with a clear concern, identify what should normally happen, gather evidence, and narrow possible causes rather than replacing parts by guesswork.

Service with evidence

Use measurements, specifications, visual inspection, safe procedures, and test results to justify technical decisions.

Verify the result

A repair or adjustment is not complete until the original concern is checked again. Evaluation connects directly back to the initial need.