PCB & PCBA
Technical Support
Send us the files you have. We’ll help you work out what comes next.
Whether you are exploring a new board, preparing a first assembly or placing a repeat order, FLJ PCB’s team can review your information and discuss the details with you. You can start the conversation before every document is ready.
Where would you like some help?
Choose a guide to learn what each document does and how it fits into your project. These pages are preparation aids: you can send your existing files first and let us help identify any useful additions.
PCB files & Gerber
Understand design files, fabrication outputs, drill data and how to view a board before manufacture.
Explore the guide →02 · Board assemblyPCB assembly files
Discover how the BOM, placement file and drawing work together to describe your assembled board.
Explore the guide →03 · Parts & sourcingBOM & component support
Learn how part numbers, quantities and sourcing choices connect to the components in your project.
Explore the guide →04 · Your orderOrdering & delivery
See how an enquiry becomes a reviewed quotation, a manufactured order and a shipment.
Explore the guide →PCB & Assembly Tools
Start with a calculation or a parts-list check. Each tool explains its inputs and limits, and lets you export the result for your own review or a manufacturing discussion.
PCB Stackup Tool
Edit a layer schedule, compare thicknesses and preview uncoated surface microstrip impedance.
Open tool →Browser-local toolTrace Width & Current
Estimate width or continuous DC current with explicit model, copper and temperature-rise inputs.
Open tool →Browser-local toolDrill Aspect Ratio
Compare the processed hole depth with a stated drill or microvia opening diameter.
Open tool →Browser-local toolPCB Panelization
Compare two uniform layouts with rails, gaps, board count and area utilization.
Open tool →Browser-local toolBOM Checker
Check references, quantities, missing part data and selected fit status locally in your browser.
Open tool →How our engineers help with your files
The first step is understanding what you are trying to build. Share your board files, an existing parts list, a drawing or a specific question. A short note about the application and quantity helps us focus the review.
For bare boards, we look at the manufacturing information: copper layers, holes, outline and construction. For assembly, we also look at the parts, placement and any special instructions. These reviews are often called DFM — design for manufacturability — and DFA — design for assembly.
If something is unclear or missing, we’ll contact you and explain what would help. That might be an additional export from your CAD software, clarification of a component’s orientation, or a choice between materials. We work through those questions with you before manufacture.
A simple way to start the conversation
Attach the information already available and describe the help you need. You could write: “We have a four-layer board in KiCad and would like 20 assembled prototypes. The BOM is still being finalized.” That gives the team a useful starting point.
For a quotation, quantity and destination help us discuss the manufacturing and delivery options. If you have a target date, mention the event it supports — such as a design review or installation — so we can discuss the schedule together.
You can also ask about testing, programming, material choices or preparing files for a repeat build. Product-specific questions are welcome; you do not need to know every manufacturing term.
Keeping your project easy to follow
A project name and revision make it easier for both teams to recognize the same board. As the design develops, we can discuss which files represent the current build and keep the answers to engineering questions with that version.
If you find a change after sending the files, let us know what changed. We’ll review it with you and explain any effect on materials, setup or timing. For repeat orders, a previous order reference is a helpful shortcut.
An optional file list
Use this simple CSV if you would like a place to list your project files. Your own file list or a note in your email works too.
Help with an order already in progress
Your order reference helps us find the relevant information quickly. Tell us whether you need a schedule update, want to discuss a design change or have a question about the delivered boards.
For a board you would like us to look at, photographs and a description of what you observed are useful. If you have test results, share those too. We’ll review the information with you and discuss the next step.
Your questions, answered
Can I contact you before all my files are ready?
Yes. Send what you have and tell us where the design stands. We can discuss the project, review the available information and help identify the next useful step.
I am not sure which files my designer has sent. Can you help?
Yes. Share the package and, if you know it, the CAD software used. We can help distinguish fabrication files, assembly data and supporting drawings.
Can we discuss components and testing as well as the PCB?
Yes. Include your parts list and describe how the product should operate. We can discuss sourcing, assembly, programming and the inspection or test approach for your project.
What if I am unsure about a technical term?
Describe the result you need or send a drawing or photograph. Our team can help translate that into the manufacturing details to discuss.
Let’s look at your project
A design archive, parts list or a short explanation is enough to begin the conversation. We’ll review it with you and help move the project forward.
Email [email protected] with your files or question. Our team will review the information and follow up with you about the next step.