Scope of this guide
Intermediate version: symptom-to-cause triage with the confirm-by column — find the variable, run one change, verify.
Series: finishing.com recurring questions answered with platingclub line practice. Parameters are industry-standard starting ranges — confirm against your supplier TDS.
Triage: symptom → confirm → first move
| Symptom | Likely root | Confirm by | First move |
|---|---|---|---|
| Dull or laminated deposits on one tank | Ripple high on that unit | Scope at load, not idle | Service that rectifier |
| Brightness worse than pre-maintenance | Filter caps aged after service | Ripple before/after | Re-check with scope |
| Some parts dull, others fine | Unit-specific by tank | By-tank defect map | Swap loads to confirm |
| Amps meter normal but deposit poor | Meter averages, ripple hides | True RMS + scope | Measure, don't trust the meter |
| Worse on bright nickel than watts | Bright systems show ripple first | Cross-tank compare | Fix before chrome queue |
Engineer notes
- One variable per corrective action; verify with the confirm-by column.
- Records beat memory: log every trial on the tank card.
- Two failed actions in a row is a senior call — escalate with your log.
Safety: rectifier internals hold lethal DC and capacitor charge even off-line. Only authorised electricians open cabinets; lock-out, verify zero, discharge caps per procedure.
FAQ
Ripple — how much is too much?
Bright nickel wants roughly under 5% at load; the supplier spec and your baseline decide.
After service it got worse — why?
Filter caps age or get missed in service. Demand a scope reading before/after.
How do I prove it's the unit not the bath?
Swap two loads between units; the dull pattern follows the unit.