The Full Lifecycle

From a flame-lamp controller to a pool robot main board, every PCBA project follows the same 7 steps. Understanding them lets brands read every line of a quote — and factories control every delivery milestone. This walkthrough uses MJX’s standard process.

Step 1: Requirement Review (1–7 days)

Input: your product definition (features, target cost, compliance markets, milestones). Output: a feasibility report — technical route, key components, cost estimate, schedule and quote. The value here is discovering dead ends early: a USD 9.9 target price with an USD 8 BOM is better learned now than later.

Step 2: System Design (1–2 weeks)

Architecture: MCU selection, module partitioning, communication interfaces, power tree, compliance pre-review. Deliverables: system spec and BOM budget. Classic pitfall: skipping compliance pre-review, then failing CE creepage after layout — full board redo.

Step 3: Hardware (2–3 weeks)

  • Schematic: modular drawing with test points on critical nets;
  • PCB layout: routing under power/signal-integrity and EMC constraints;
  • DFM review: manufacturability audit (pads, silkscreen, panelization, test points) — avoiding "designable but unmanufacturable".

Step 4: Firmware (2–4 weeks, parallel)

Drivers (sensors/motives/comms) → algorithms (control logic) → application (modes/UX/app protocol). The parallel key is interface-first: pin mapping finalized with driver development in sync, so boards light up day one. Sequential projects typically lose 2–3 weeks here.

Step 5: Prototype Validation (1–2 weeks)

3–5 SMT units, bring-up (power, clock, comms staged), then functional, performance (thermal/aging) and safety pre-tests (EMC pre-scan). Deliverable: test report. This is the first time you touch the product — attend prototype acceptance in person.

Steps 6–7: Pilot & Production

Pilots exist to expose production issues at 300–1,000 units: material batch variance, fixture stability, operator discipline. Skipping pilot multiplies rework cost 5–10×.

Pilot vs Production
PhaseGoalKey Deliverables
Pilot (2–3 wks)Validate manufacturability & yieldFixtures, SOP, yield report (≥98.5%)
Production (ongoing)Stable delivery & qualityIQC/OQC, batch traceability, warranty & iteration

FAQ

What’s the fastest possible timeline?
Light customization on mature platforms: as fast as 3–4 weeks to pilot with parallelization. From scratch: 8–12 weeks. Complex robotics: 12–20 weeks to first build.
Where must clients engage deeply?
Three checkpoints: ① assessment sign-off (definition & quote alignment); ② system design review (architecture & key parts); ③ prototype acceptance (function/look/feel). Everything else is covered by weekly reports.