Checking The Flatness Of The Pcb - Samsung SM421 Operation Handbook

PART VI. Additional Check Points
SM421 Operation Handbook

3. Checking the flatness of the PCB

- Place and secure the PCB in the conveyer. Then, check if the PCB is flat using a ruler.
1. Checking the flatness of the PCB in a diagonal direction 2. Checking the flatness of the PCB in a horizontal direction
- Use a ruler to check if the PCB is flat diagonally. - Use a ruler to check if the PCB is flat in three horizontal positions.
If the PCB is not flat, the parts may not be properly placed. If the PCB is not flat, reset the height of the backup pins.
Caution
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PART VI Additional Check Points