How to quickly judge the quality of PCB board

When we get a PCB board, if there are no other test tools, how to quickly judge the quality of the PCB board? Now, I will introduce a method for quickly judging the quality of PCB boards without the help of tools.

PCB board quality judgment method

1. The size and thickness of the PCB board must be consistent with the specified appearance size and thickness without any deviation. The surface of the circuit board is free of defects, deformation, shedding, scratches, open circuits, short circuits, oxidized white, yellow, dirty or excessively etched marks, no dirt, copper particles and other impurities.

2. The ink covering layer is uniform, bright, without falling off, scratches, copper dew, deviation, printing plate, etc.

3. The symbols and letters in stencil printing are clear, without omissions, ambiguities, reversals, deviations and other undesirable phenomena.

4. The carbon film must not have defects, deviations, short circuits, open circuits, reverse printing, etc.

5. PCB bottom plate molding, no leakage, deviation, hole collapse, piercing, plug hole, beer burst, beer reverse, crushing and other phenomena.

6. Whether the edge of the PCB is smooth, if it is a V-cut, you should pay attention to whether the V-shaped cutting groove causes breakage, whether the two sides are symmetrical, etc.

Usually through these 6 points, you can quickly judge the quality of the PCB board.