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Common failures and corrective methods of carbon film PCB
Nov 17, 2018

Common failures and corrective methods of carbon film PCB

Troubleshooting method for the cause of sequence number failure

1. Too thin film thickness

2. Too large mesh size

3. Low viscosity of carbon slurry 3. Adjust the viscosity of carbon slurry

4. Too short curing time

5. Curing incomplete air ventilation 5

6. Low curing temperature

The screen printing speed is too fast

1. Low viscosity of printing carbon slurry 1. Adjust the viscosity of carbon slurry

2. Screen printing is too low. 2

3. Too much pressure of the scraper 3. Reduce the pressure of the scraper

4. Replace the hardness of the scraper

3 poor adhesion of carbon film

2. Incomplete curing 2. Adjust the curing time and temperature

3. Expiration of carbon slurry 3. Replacement of carbon slurry

4. Adjust the pressure during electrical inspection

5. Impact during punching and cutting

4. Carbon film pinhole 1

2. Screen printing height 2. Adjust the screen distance

3. Uneven film thickness of screen plate 3. Adjust the thickness of screen plate

4. Fast screen printing speed 4. Reduce screen printing speed

5. High viscosity of carbon slurry 5. Adjust the viscosity of carbon slurry

6. Replace the scratch board hardness