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How can I know how many layers a PCB has?

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How can I know how many layers of the PCB I have?

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May 23 at 09:08
Eng.Mohamed El sehrawy

Having this note is because that a pcb should be free from moisture prior to processing. Moisture can migrate into tiny holes, which will influence the performance of this PCB.

Jun 9 at 11:25
Guillaume Leblanc

It is for gettimg rid of moisture, probably to keep the steam from pushing BGAs or CSP packages off the board.

Jun 27 at 03:15

In order to avoid copper oxide and moisture make solderability poor. It is also the resaon PCBs are sealed in plastic in storage for production.

Oct 16 at 06:12
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