Common Errors That Cause PCB Assembly Holds

Pcb Assembly and Common Errors

Double-check Your Orders to Avoid These Assembly Errors

Sierra Circuits builds boards precisely as our customers direct. We make sure we understand exactly what you want, and we must hold a job if we find any discrepancy between your order and the files or parts you provide. Please double-check orders to avoid the following errors that would cause delays.

Incomplete data: Sierra prefers to receive manufacturing data in the ODB++ format; however Gerbers accompanied by X-Y pick-and-place data and a BOM are acceptable. Such details as RoHS or standard solder processing, finish plating, and soldermask selection must be clear and complete.

Footprint mismatch: A component identified in the BOM is too big, too small, or otherwise incorrect for its designated position.

Kitting components mixed, not separated: Consigned or partial turnkey assembly jobs cannot proceed unless the components for each line item in the BOM are contained on their own clearly marked reel or tape, or in a single bag or tray.

Multiple orders in one bag: Simultaneous consigned or partial turnkey orders are certainly welcome from any customer but if the parts for each order are not separated into an independent box or bag with the accompanying BOM, assembly cannot begin.

Missing components: Customer-provided components must include minimum required overages to compensate for possible assembly attrition or the order will be considered incomplete and will be delayed until corrected.

BOM not updated to match design changes: Last-minute design changes sometimes occur but the BOM and all assembly files, instructions, and materials must be updated to coincide with those revisions.

Polarity not marked: If the anode or cathode of diodes is not clearly indicated or the polarity of other components is not evident, PCB assembly process must be delayed.

Visit our resources page to find out about our PCB services and download the DFM checklists.

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