Why design review catches errors before fabrication in PCB Design - Dashboard Impact

Dashboard Mode - Why design review catches errors before fabrication

Goal

Understand how design reviews help catch errors before PCB fabrication to save time and cost.

Sample Data: PCB Design Errors and Costs

Design Stage	Errors Found	Cost per Error ($)	Total Cost ($)
Design Review	15	50	750
Fabrication	5	500	2500
Assembly	3	1000	3000
Testing	2	1500	3000
Field	1	5000	5000

Dashboard Components

• KPI Card: Total Errors Found in Design Review = 15
• KPI Card: Total Cost of Errors Found in Design Review = $750
• Bar Chart: Errors Found by Stage
  Formula: Use the 'Errors Found' column from the sample data
  Shows number of errors found at each stage
• Bar Chart: Cost per Error by Stage
  Formula: Use the 'Cost per Error ($)' column
  Shows how costly each error is depending on stage
• Stacked Bar Chart: Total Cost by Stage
  Formula: Use 'Total Cost ($)' column
  Shows total cost impact of errors at each stage
• Table: Detailed Error Costs by Stage
  Shows all columns from sample data for detailed view

Layout

+--------------------------------------------------+
| KPI: Total Errors Found (Design Review) | 15     |
| KPI: Total Cost (Design Review)        | $750   |
+--------------------------------------------------+
| Bar Chart: Errors Found by Stage                  |
|                                                  |
+--------------------------------------------------+
| Bar Chart: Cost per Error by Stage                 |
|                                                  |
+--------------------------------------------------+
| Stacked Bar Chart: Total Cost by Stage             |
|                                                  |
+--------------------------------------------------+
| Table: Detailed Error Costs by Stage                |
|                                                  |
+--------------------------------------------------+

Interactivity

A filter for Design Stage lets users select one or multiple stages.

When a stage is selected, all charts and KPIs update to show data only for that stage.

This helps focus on specific stages to see error counts and costs clearly.

Self Check

Add a filter for Design Stage = Fabrication. Which components update?

• KPI cards update to show errors and cost for Fabrication only (Errors = 5, Cost = $2500).
• Bar charts update to show only Fabrication data.
• Table filters to show only Fabrication row.

Key Result

Dashboard shows how design reviews catch more errors early at lower cost compared to later stages.

Practice

1. Why is a design review important before PCB fabrication?

easy

A. It eliminates the need for testing after fabrication.

B. It speeds up the manufacturing process directly.

C. It reduces the number of components needed.

D. It helps find errors early to avoid costly mistakes.

Solution

1. Step 1: Understand the purpose of design review

   Design review is done to catch errors before the PCB is made.

2. Step 2: Identify the benefit of early error detection

   Finding errors early prevents costly mistakes and rework later.

3. Final Answer:

   It helps find errors early to avoid costly mistakes. -> Option D

4. Quick Check:

   Early error detection = It helps find errors early to avoid costly mistakes. [OK]

Hint: Design review = find errors early to save cost [OK]

Common Mistakes:

• Thinking design review speeds manufacturing directly
• Believing it reduces components needed
• Assuming it removes need for testing

2. Which of the following is the correct step in a PCB design review process?

easy

A. Checking component placement and routing carefully

B. Ignoring schematic errors until after fabrication

C. Skipping the review if the design looks simple

D. Starting fabrication before review completion

Solution

1. Step 1: Identify correct review steps

   Design review includes checking component placement and routing.

2. Step 2: Eliminate incorrect options

   Ignoring errors, skipping review, or starting fabrication early are wrong.

3. Final Answer:

   Checking component placement and routing carefully -> Option A

4. Quick Check:

   Review step = Checking component placement and routing carefully [OK]

Hint: Review = check placement and routing carefully [OK]

Common Mistakes:

• Ignoring errors until fabrication
• Skipping review for simple designs
• Starting fabrication too early

3. During a design review, a PCB schematic shows a missing connection between two components. What is the likely outcome if this error is not caught before fabrication?

medium

A. The PCB will function perfectly without issues.

B. The PCB will fail or behave unpredictably.

C. The fabrication cost will decrease.

D. The error will fix itself during manufacturing.

Solution

1. Step 1: Understand impact of missing connection

   A missing connection means the circuit is incomplete and won't work properly.

2. Step 2: Predict outcome if error is not fixed

   The PCB will fail or behave unpredictably, causing problems.

3. Final Answer:

   The PCB will fail or behave unpredictably. -> Option B

4. Quick Check:

   Missing connection = PCB failure [OK]

Hint: Missing connection causes failure [OK]

Common Mistakes:

• Assuming PCB works fine without all connections
• Thinking fabrication cost decreases due to errors
• Believing errors fix themselves automatically

4. A design review checklist missed verifying the power supply connections. After fabrication, the PCB does not power on. What is the best way to fix this issue?

medium

A. Ignore the problem and use the PCB as is.

B. Add extra components on the existing PCB to fix power.

C. Redesign the PCB to correct the power connections and fabricate again.

D. Change the software to compensate for power issues.

Solution

1. Step 1: Identify the cause of power failure

   Power supply connections were not verified, causing no power.

2. Step 2: Determine correct fix

   Redesigning and refabricating the PCB to fix power is necessary.

3. Final Answer:

   Redesign the PCB to correct the power connections and fabricate again. -> Option C

4. Quick Check:

   Fix power by redesign and refabrication [OK]

Hint: Fix power issues by redesigning PCB [OK]

Common Mistakes:

• Ignoring the problem
• Trying to fix power with extra components
• Changing software instead of hardware

5. A PCB design review process includes schematic check, layout verification, and design rule check (DRC). If the DRC flags a clearance violation, what should be the next step to ensure fabrication success?

hard

A. Adjust the layout to fix the clearance violation before fabrication.

B. Remove components to avoid the violation.

C. Proceed with fabrication and fix errors later.

D. Ignore the violation if it looks minor.

Solution

1. Step 1: Understand what a clearance violation means

   Clearance violation means components or traces are too close, risking shorts or failures.

2. Step 2: Decide the correct action

   Adjusting the layout to fix the violation before fabrication prevents costly errors.

3. Final Answer:

   Adjust the layout to fix the clearance violation before fabrication. -> Option A

4. Quick Check:

   Fix clearance violation by layout adjustment [OK]

Hint: Fix DRC errors before fabrication [OK]

Common Mistakes:

• Ignoring minor violations
• Fabricating with known errors
• Removing components unnecessarily