1. The pads of the <br>vias on the PCB are too small; <br>2. The size of the vias on the PCB is too small; 3. The pin spacing is too small; <br>4. The directional component has no 1-pin mark or direction mark;
1. The perforated pad on the PCB is too small;<br>2. The size of the perforation on the PCB is too small;<br>3. Pin spacing is too small;<br>4. Directional elements do not have a foot mark or directional identification;
1. The pad of via on PCB is too small;<br>2. The size of via on PCB is too small;<br>3. The pin spacing is too small;<br>4. The directional element has no one pin identification or direction identification;<br>