PCB Communication & Stakeholder Relations 4 — Questions and Answers
Question 1: A test engineer reports that test probe access is blocked by a component added late in layout. How could this have been prevented?
- By increasing board size automatically
- By involving test engineering in early design reviews and sharing testability requirements upfront (Correct answer)
- By removing all through-hole components
- By outsourcing the test design to the EMS provider
Correct answer: By involving test engineering in early design reviews and sharing testability requirements upfront
Early cross-functional collaboration ensures testability requirements such as test point placement are incorporated before the layout is locked.
Question 2: What information should a PCB designer include when escalating a component obsolescence issue to the supply chain team?
- Only the part number
- The part number, last-time-buy date, affected assemblies, and potential drop-in replacements with electrical comparison (Correct answer)
- The Gerber file reference only
- The purchasing lead time only
Correct answer: The part number, last-time-buy date, affected assemblies, and potential drop-in replacements with electrical comparison
A complete escalation package enables supply chain to make informed procurement decisions and evaluate alternatives without repeated back-and-forth.
Question 3: During a design handoff, the fabrication house asks for clarification on controlled impedance tolerances. Who should the PCB designer consult?
- Only the fabrication house's internal engineering team
- The signal integrity engineer or the originating electrical engineer who specified the impedance requirement (Correct answer)
- The procurement manager
- The mechanical engineer
Correct answer: The signal integrity engineer or the originating electrical engineer who specified the impedance requirement
Impedance tolerances are set by electrical performance requirements, so the originating engineer must confirm acceptable tolerances before instructing the fab.
Question 4: A regulatory compliance team asks whether the PCB design meets RoHS requirements. Which document best answers their question?
- The schematic netlist
- The Bill of Materials with RoHS compliance status listed for each component (Correct answer)
- The Gerber layer files
- The IPC-2581 file
Correct answer: The Bill of Materials with RoHS compliance status listed for each component
RoHS compliance is material-based and must be documented component-by-component in the BOM with supplier-provided compliance declarations.
Question 5: A stakeholder from marketing requests a new board color for aesthetic reasons. What should the PCB designer do?
- Immediately specify the new color in the fab notes
- Evaluate whether the color change affects cost, lead time, or performance before committing (Correct answer)
- Refuse all cosmetic changes
- Change the color without informing the project manager
Correct answer: Evaluate whether the color change affects cost, lead time, or performance before committing
Non-standard solder mask colors may affect fab lead time and cost and should be evaluated holistically before being agreed upon with the stakeholder.
Question 6: What is the best way to communicate net impedance requirements to a PCB fabrication house?
- Verbal discussion during a phone call
- A controlled impedance specification table in the fabrication drawing, referencing specific trace layers and target impedance values (Correct answer)
- An email with approximate values
- The schematic diagram only
Correct answer: A controlled impedance specification table in the fabrication drawing, referencing specific trace layers and target impedance values
Formal written specifications in the fab drawing create an auditable record and ensure the fab designs the stackup to meet exact impedance targets.
Question 7: A hardware manager wants weekly status updates on the PCB layout. Which format provides the most useful snapshot?
- Full PCB database export every week
- A brief summary covering routing completion, open DRC violations, pending decisions, and schedule status (Correct answer)
- Raw CAD screenshots without context
- The full detailed DRC report
Correct answer: A brief summary covering routing completion, open DRC violations, pending decisions, and schedule status
A concise status summary focused on key metrics and blockers lets management quickly assess progress and identify where decisions are needed.
PCB Communication & Stakeholder Relations 4
A test engineer reports that test probe access is blocked by a component added late in layout.
How could this have been prevented?