PCB - FAQ & Co.

Here you can find several frequently asked questions and answers about our printed circuit boards. You may browse through the categories or use the search. If your question remains unanswered, please contact us by email, phone or contact form. We will reply you as soon as possible.

FAQ:

1. Mechanical Processing
2. Chemical Processing
3. Solder Mask
4. Surface Finish
5. Silk Print
   1. Why do positioning prints on copper pads have to be avoided?

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   2. Why are silk prints required to have a minimum line thickness of 0.18 mm to 0.20 mm?

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      When applying positioning tags, the screen printing method is used. The screen consists of fine-meshed structures with approximately 100 to 120 fibres per inch (4 to 5 fibres per mm). The areas which are not required to be printed are covered with a film mask while the printing is applied onto the desired surface. The number of fibres and the distances in between theoretically permits a smallest line thickness of 0.1 mm.

      To carry out a flawless printing a line thickness of 0.18 mm to 0.20 mm is recommended though. Finer screens prove to be technically inefficient due to their mechanical sensitivity and the problems occuring when applying the color through such fine meshes.

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   3. Are legend print, silk print, mounting print and position print the same?

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   4. Why are mounting prints removed from the pads?

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6. Base Materials
7. RoHS/WEEE
8. E-Test
9. Panel Production
10. Tolerances

Additional information about Printed Circuit Boards (PCBs):

• wikipedia.org
  Online Encyclopedia - Topic PCBs
• www.vde.com
  VDE - Verband Elektrotechnik Elektronik Informationstechnik e.V.
• www.vdi.de
  VDI - Verein deutscher Ingenieure
• www.vdlev.org
  VDL - Verband der Leiterplattenindustrie
• www.zvei.de
  ZVEI - Zentralverband Elektrotechnik- und Elektronikindustrie e.V.
• www.leuze-verlag.de
  Leuze Verlag - Literature about PCBs and PCB production
• www.elektronikpraxis.vogel.de
  Elektronik Praxis - Magazine covering electronics in general and news in the PCB production industry.
• www.elektor.de
  Elektor - Electronics Magazine with manuals and layouts for home made PCBs and PCBAs
• www.ibfriedrich.com (Target 3001)
  The Engineering office Friedrich has been developing layout and CAD software for PCB design and Application Oriented Special Integrated Circuits (ASICs) since 1989.
• www.cadsoft.de
  CadSoft offers user-friendly, powerful, and inexpensive solutions for PCB designs including circuit diagrams, layouts, and autorouting routines.
• http://news.google.de/news
  Worldwide news about Printed Circuit Boards (PCBs)