Four failures account for most QC breakdowns on charger programmes, and three of them are visible in the paperwork within an hour. None of the four is a machine problem, and all four survive because they look like normal practice until a batch is rejected or a customer complains.
Charger QC process: the four failures to look for first
A limit with no source, a record without data, a gate with no owner, and a deviation with no decision.
Each produces a recognisable symptom, and each is confirmed by reading documents rather than by testing units. The order below follows how often they are found, and the fix for each is a document or an assignment rather than an investment.
Failure 1: a limit with no source
The limit exists, is used daily, and nobody can say where it came from.
Where the limit came from a component datasheet, it describes the component rather than the finished product; where it came from the line’s history, it drifts with the line’s habits. Confirm it by asking for the measurement series behind two or three key limits. The fix is to set them from the characterisation data on the design and to record that source in the criteria document, so a later change is a decision rather than a drift.
Failure 2: a record without data
A pass rate is not a record, and it cannot answer a question about a specific lot.
The useful record stores the measured value per unit or per lot against the limit, with the instrument and the date. Confirm it by asking for the raw values behind the last shipment rather than the report built from them. The fix is a small change to the test station: store the value instead of the flag, and keep it for as long as the product is on the market.
Failure 3: a gate with no owner
Every gate needs a named station and a named person, or it becomes a shared assumption.
Typical symptoms are a sample drawn by whoever is free, a first-article check signed by nobody in particular, and a packaging proof approved by a person who has since left. Confirm it by asking who signs each gate and what the signature covers. The fix is an assignment written into the criteria document, with a second name for cover.
Failure 4: a deviation with no decision
A deviation that is tolerated once becomes the new standard by repetition.
Where a batch is released with a note that a parameter was marginal, or a substitution is made for supply reasons, the outcome has to be a decision: accept with the evidence, rework, or hold. Confirm it by asking for the disposition of the last deviation and the reason it was recorded. The fix is a short deviation record with a named approver, which is also what protects the engineer who made the call.
| Failure | How it appears | How to confirm it | What the fix changes |
|---|---|---|---|
| A limit with no source | Daily use, no reference | Ask for the measurement series behind it | Limits set from characterisation data |
| A record without data | A pass rate with no values | Ask for the raw results for the shipment | Values stored per unit or lot |
| A gate with no owner | Sampling decided ad hoc | Ask who signs each gate | Named owners in the criteria document |
| A deviation with no decision | Marginal units released with a note | Ask for the disposition and the reason | A deviation record with an approver |
Rebuilding the process in six documents
Six documents carry the whole process, and each has one reader.
The product specification, the acceptance criteria with the source of each limit, the test and inspection plan with its sample points, the record format, the deviation record, and the containment or corrective action record. Together they answer every question a buyer, an auditor or a new factory will ask, and they are short documents rather than a quality manual.
Keeping the process alive after the first order
The second order is where processes quietly relax.
The criteria are renegotiated because the first set was never written down; the sampling drifts to the convenient point in the shift; the retained reference for the finish is lost or worn; and the deviation record becomes a verbal arrangement. Each is prevented by treating the six documents as part of the product, reviewed at every change of component, factory or packaging rather than only when a dispute arises.
FAQ
Some factories say their process is proprietary. Can they refuse to show it?
The process for your product is not proprietary: the limits, the sample points and the records describe what was made for you. A supplier that declines to share them leaves the buyer unable to trace a defect, which is a commercial exposure rather than a trade secret. The limits, the sample points and the records describe what was made for you rather than a process owned by the factory.
Is an eight-step corrective action report necessary?
A structured corrective action is useful when a defect has reached a customer or repeated across batches. For an internal finding, a short record with the cause, the change, the owner and the verification date carries the same information without the ceremony. A structured corrective action is useful when a defect has reached a customer or repeated across batches, while an internal finding needs a shorter record.
How do we know the limits are right?
The limits come from measured characterisation data on the design, not from a datasheet or a habit. Where the distribution sits close to a limit, the process or the design needs attention, and tightening the limit alone only moves the discovery closer to the customer. The limits come from measured characterisation data on the design rather than from a datasheet or a habit.
What is the first thing to fix?
The record, because it makes everything else visible. Once values are stored against limits, a drifting process, a missing owner and a tolerated deviation all become apparent from the data rather than from a dispute. Once values are stored against limits, a drifting process, a missing owner and a tolerated deviation all become apparent from the data rather than from a dispute.
Next step
Send the product, the parameters that matter to your channel and the market requirements to Wecent Group through the contact page. The reply returns the six documents for the product, with the limits and their sources, and an example of a deviation record. Related reading: the factory floor, OEM and ODM charger manufacturing and charger manufacturing services. External references: IEC standards, IEC Webstore, UL standards and certification, TUV testing services, Intertek testing services and IQNet certification network.
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