An electronic manufacturing services provider builds for brands that own no factory. On Monday a box-build line may assemble an energy meter for one customer. On Wednesday it builds a network router for a second, and on Friday a harness-and-enclosure job for a third. The same operators move with the work. Each brand has its own drawings, torque chart, label layout, test sequence and carton rules. The EMS providers page names this as the first strain on the floor.
Where a product switch goes wrong
- A torque driver left on the previous product's setting, cracking plastic bosses or leaving screws loose.
- A serial label printed from the last customer's template, with the wrong barcode format.
- A hipot or functional test step skipped because the last product did not need it.
- Cartons packed to one brand's rules for another brand's pallet.
- An engineering change on one customer's board missed because the operator learned the earlier revision.
How three brands differ on one bench
- Fastening: a plastic meter cover with self-tapping screws beside a steel router chassis with machine screws and thread-locking compound.
- Labels: serial format, rating plate, barcode symbology and where the warranty sticker sits.
- Test: one brand wants hipot and earth continuity, another a firmware flash and burn-in, a third a full functional sequence against a golden unit.
- Workmanship: one customer accepts a cable tie cut flush, another wants it trimmed and capped, and coating keep-out zones differ board to board.
- Packing: foam inserts, desiccant sachets, humidity indicator cards, carton markings and pallet stacking patterns.
- Line clearance: which leftover screws, labels and loose parts must leave the bench before the next brand starts.
An operator who builds all three in a week carries six rulebooks at once.
These are seldom skill problems. The operator knows each product. The error comes from carrying one product's habit into the next, usually within the first hour after a switch.
What one wrong label costs an EMS unit
A wrong label or a missed test can bring a complaint, a sort at the customer's warehouse and a formal corrective action report. The customer's quality team then visits. Their first question is who built the units and whether that person was trained on that product. A gap in the sign-off record falls on the whole unit, and it can colour future orders from that brand.
Why switches arrive unbriefed
Volumes shift between brands, so planners move people to wherever the orders are. Moves happen fast, often mid-shift, with no briefing. Training records list tasks but not customers, so nobody sees that an operator signed on screwing for one brand has never seen the second brand's torque chart. Line leaders, mostly promoted operators, are left to manage the switch with no time set aside for it.
Five controls for a shared floor
- 1
Keep the skill grid by customer and task
Rows for people, columns for each customer's product and each task on it, with level, date and checker. Planners then move people only onto products they are signed on.
- 2
Brief every switch at the station
Two minutes at the start: what differs from the last product, the torque value, the label template, the test steps, the packing photo. The line leader runs it.
- 3
Put a photo job aid at each station
One laminated sheet per product: torque value and bit type, label sample, test steps in order, packed-unit photo. The previous product's sheet comes down at the switch.
- 4
Sign off before solo work on a new product
A supervised first lot and a signature before anyone builds alone. Repeat after any engineering change that alters the operator's task.
- 5
Limit switches per person per shift
Where possible keep each operator on one product per shift, and plan switches at shift start rather than mid-shift.
The grid is what auditors ask for. Keeping it current by customer is covered by employee information for EMS units. Product-by-product sign-off is covered by learning and development for EMS units.
Line leaders carry the switch
The briefing and the job-aid swap depend on the line leader. Most were the best operators on the line. Few were shown how to brief a group, push back on a planner who moves people mid-shift, or settle an operator unsure of a new product. Leadership training for EMS line leaders deals with that directly. Give the line leader authority to hold a switch until the briefing is done.
Planning people against brand forecasts
Fewer unplanned switches mean fewer slips. A monthly view of each brand's forecast, set against who is signed on which product, shows where to cross-train before the volume lands. Building that view is covered by workforce planning for EMS units. Recognise operators signed on many products in their grade, since they carry the unit's flexibility. Our page on people pressures across electronics covers the rest.
