When PCBA moves to a new factory or is outsourced to a new contract manufacturer, delays are often caused by incomplete documents. Public sources say the design data should include at least Gerbers, pick-and-place (centroid) files, a BOM (with alternates) and assembly drawings; process instructions for non-standard assembly steps, test procedures, firmware and experience that lives just in veterans’ heads must also be written down, or they are lost in the transfer. Materials don’t transfer by themselves: in one example from a 2025 article, lead times differed by about 3 times. Test fixtures are often specific to the old facility, so confirm whether they can be moved, replaced or rebuilt, and revalidate with known good boards. Then run a small pilot, with exit criteria set before the pilot, and then ramp up. This article covers which documents to prepare when moving PCBA to a new contract manufacturer or outsourcing it, and how to hand over and validate; PCB design itself, supplier selection and price negotiation, and transfer of final product assembly are outside its scope. It is divided into 5 stages:

Stage ① Inventory the design data: Gerbers, pick-and-place file, BOM, assembly drawings, each one checked.
Stage ② Inventory process and test data: process instructions, reflow profiles, test procedures, firmware, and experience written down.
Stage ③ Materials and supply chain: supplier and inventory lists, end-of-life parts, lead time differences.
Stage ④ Test and validation: who owns fixtures and test equipment, whether they can move, and revalidation with known good boards.
Stage ⑤ Pilot run and communication: small pilot, exit criteria, contacts on both sides and weekly meetings.

This describes the general case; individual cases still need their own assessment.

Figure 1. Five stages: design data (a version-checked design package) → process and test (process and test documents) → materials and supply chain (a materials handover list) → test and validation (a validated test station) → pilot and communication (a line ready to ramp).

Stage ①: Inventory the design data

Gerbers: key content includes layer descriptions, aperture definitions and etch data, useful for both fabrication and assembly; output from the design software (Source 2).
Pick-and-place (centroid) file: each part’s X and Y position, rotation, reference designator, side and package (Source 2).
BOM: item number, reference designator, package, quantity, description, manufacturer and notes; mark alternates and non-cancelable, non-returnable (NCNR) parts (Sources 2, 3).
Assembly drawings: where parts sit on the board’s outer layers, for manufacturing and inspection staff to check against (Source 2).
Check each one: carefully verify that “drawings within drawings,” layer details and part numbers are correct (Source 1); assembly drawings must carry the current revision, since old revisions mixed into the documents cause errors (Source 3).

Figure 2. Four packages to hand over (illustration, based on Sources 1, 2 and 3): design data (fabrication files, pick-and-place file, BOM with alternates, assembly drawings); process data (process instructions, reflow profiles, fixture and stencil lists, line setup consumables); test data (test procedures, firmware, test fixtures and programs, known good boards); materials and supply chain (supplier list, current inventory, end-of-life parts, lead times).

An article in an electronics industry publication (2023) by an author with 25 years’ experience in PCB sales and customer service says that without these files, errors such as wrong quantities, unmarked polarity and unmarked orientation can occur, and that some design tools generate pick-and-place files automatically while others require editing existing data. An EMS transfer checklist says to collect and share all product documentation and check that it is complete.

Stage ②: Inventory process and test data

Process instructions: non-standard assembly steps need written process instructions (Source 3).
Test procedures and firmware: test steps, pass/fail criteria, and the firmware version to be programmed (Source 3).
Write the experience down: methods known just to veterans on the floor are lost in the transfer if not written down (Source 3).
Reflow profiles: during the pilot ramp, process engineers tune solder paste volume, reflow profile and placement parameters for the board and part combination (Source 3).
Fixture, stencil and carrier list: drawing number, revision, quantity and current location of each, in one table (this article’s compilation).
Line setup consumables: list which consumables the new factory needs and how many days’ stock (this article’s compilation; see JIAHON’s published list below).

A product development company with manufacturing support services (article, April 2025) says incomplete documentation is a common cause of delay when changing contract manufacturers, and calls unwritten process experience “tribal knowledge” that is lost in transfer.

How JIAHON can help:

For which consumables a new factory needs and how many days’ stock, JIAHON’s line setup list “Setting up a new SMT line: a complete consumables checklist for engineers” organizes consumables by process section with specification points, acceptance thresholds and safety stock days, including reflow fixtures and fixture locating pins; it also gives a formula: recommended stock = average daily usage × safety stock days.

Stage ③: Materials and supply chain

Supplier and part list: hand over the approved vendor list and updates, special pricing and discount arrangements, and current inventory together (Source 1).
Material channels: the new factory’s purchasing channels may not get the same lead times; confirm first (Source 3).
Moving current inventory: whether material held by the customer or suppliers should be sent to the new factory (Source 1); evaluate first whether the previous manufacturer’s inventory can be moved to cover the gap (Source 3).
End-of-life parts: assess whether parts and products are near end of life, and handle EOL parts, including last-time buys for the transition (Source 1).
Buffer stock: consider buffer stock based on the test and validation schedule (Source 1).

The 2025 article’s hypothetical example: the same part has an 8-week lead time at the previous manufacturer, but may take 24 weeks through the new factory’s default channel.

Stage ④: Test and validation

Who owns the validation plan: decide first who is responsible for it (Source 1).
Who owns test equipment and fixtures: ownership of in-circuit testers, functional test systems and fixtures, and whether they can be moved, replaced or duplicated (Source 1).
Fixtures may not move: fixtures and test setups are often specific to the old facility; if they must be redesigned, schedule and budget it as a separate deliverable (Source 3).
Validate with known good boards: prepare boards known to be good and use them to validate the test procedures before production (Sources 1, 3).
Revalidate reproducibility: before production, reconfirm the repeatability and reproducibility of the test systems and equipment (Source 1).
Set yield targets: set first-pass yield targets for in-circuit, functional and system test (Source 3).

Figure 3. The transfer sequence (illustration, based on Sources 1 and 3): inventory documents (check revisions and part numbers) → handover (documents, materials, fixtures) → validation (known good boards, reproducibility) → small pilot (exit criteria set first) → ramp (to plan, with flexibility). Don’t treat the pilot as production; meet weekly or more often, and raise problems early.

How JIAHON can help:

When the new factory needs trays, carts or EVA foam made to size, JIAHON’s general custom page says: “Sizes and materials made to your specification.” The process is: send sizes or drawings, drawing confirmation, sampling, production.

Stage ⑤: Pilot run and communication

Run a small pilot first: don’t ramp straight after the move; schedule the pilot separately (Source 3).
Set exit criteria first: set the pass criteria before the pilot, and don’t treat the pilot as production (Source 3).
Both sides assign project managers: roles and responsibilities written clearly, with a fixed contact for each person (Source 1).
Meet weekly: status meetings weekly or more often, raising problems as soon as they arise, such as failure history, reliability and end-of-life parts (Source 1).
Keep the schedule flexible: write the transfer plan down, but allow for adjustment (Source 1).

The 2025 article says expecting immediate production after the move is a common cause of schedule failure; a pilot of 100 to 300 boards depending on product complexity is basic practice and adds 3 to 4 weeks; and for a medium-complexity product, a well-managed transfer from choosing the partner to stable production usually takes 12 to 20 weeks. The transfer checklist adds quarterly executive reviews on top of the weekly meetings.

Sources and limits

Sources: Source 1: an EMS transfer checklist (no publisher name on the page; judging by the URL, a company’s material; undated). Source 2: an article in an electronics industry publication by an author with 25 years’ experience in PCB sales and customer service (January 2023). Source 3: an article by a hardware and software product development company with manufacturing support services listed on its site (April 2025). JIAHON material: our published articles and general custom page. IPC data exchange standards (such as IPC-2581) and first article inspection standards were not read.

Limits: Source 1 appears to be an EMS provider’s material, and Source 3 is a product development company offering manufacturing support, so both may favor their own approaches; Source 3’s figures (lead times, pilot quantities, weeks) are its 2025 recommendations and examples, not rules. The fixture, stencil and carrier list and line setup consumables in Stage ② are this article’s compilation.

This is a general summary, not a restatement of any standard, an endorsement of any supplier, contract manufacturer or service provider, or a promise about your project; follow your contract with the manufacturer, your customer’s requirements and the relevant standards, and your own validation.

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What Documents to Prepare When Transferring or Outsourcing PCBA: From Gerber, Pick-and-Place Files and BOM to Test and Fixture Lists, in 5 Stages from Inventory and Handover to Validation and Pilot Run