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Module 5: PCB Fabrication

Module 5: PCB Fabrication. Prepared by: Cesar Mendoza Applied Technology Teacher. Module Objectives. Learners who successfully complete this module will be able to: Define a PCB. State the basic functions of a PCB. Describe the PCB fabrication steps.

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Module 5: PCB Fabrication

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  1. Module 5: PCB Fabrication Prepared by: Cesar Mendoza Applied Technology Teacher

  2. Module Objectives Learners who successfully complete this module will be able to: Define a PCB. State the basic functions of a PCB. Describe the PCB fabrication steps. Use Tina PCB Design software to produce the artwork and a layout for a simple circuit diagram. Develop the PCB for a simple circuit. Prepared by: CESAR MENDOZA-Applied Technology Teacher

  3. 1 Introduction to PCB PCB stands for Printed Circuit Board. PCBs are used in many applications such as radios, televisions, mobile phones…….etc Prepared by: CESAR MENDOZA-Applied Technology Teacher

  4. Basic functions of a PCB The basic functions of a printed circuit board are (see Figure 5.2): To provide electrical connectionbetween the points those need to be interconnected; To provide insulation between the tracks and other points that need to be isolated; To provide necessary mechanical supportto the components mounted on the board; To reduce size and cost, provide better performance and reliability. Prepared by: CESAR MENDOZA-Applied Technology Teacher

  5. PCB Basic Functions Prepared by: CESAR MENDOZA-Applied Technology Teacher

  6. PCB without Components COPPER CLAD PCB with Components Prepared by: CESAR MENDOZA-Applied Technology Teacher

  7. PCB –Copper Clad Resist Cover Etch Resist Copper Layer PVC Base Prepared by: CESAR MENDOZA-Applied Technology Teacher

  8. PREPARING THE ARTWORK The artwork can be prepared manually or by using the software TINA software is used to prepare the artwork in PCB The circuit is prepared in TINA and the artwork printed on a transparent sheet PCB Fabrication Steps Prepared by: CESAR MENDOZA-Applied Technology Teacher

  9. Exposure- the first stage in transferring the artwork pattern onto the PCB The artwork is aligned with the copper clad board Places in the Ultraviolet (UV) and exposed for 2 minutes The UV light will print and protect the etch resist ink on the tracts Stage 2. Exposure Prepared by: CESAR MENDOZA-Applied Technology Teacher

  10. Stage 3: Developing and Rinsing In this stage, the etch resist ink is removed from the unwanted areas of the PCB leaving the tracts. The PCB is immersed in a developing solution and the unwanted etch resist ink is brushed away. The PCB is rinsed to make design more clear. Prepared by: CESAR MENDOZA-Applied Technology Teacher

  11. Stage 4: Etching The PCB is immersed in the Etching solution (Ferric Chloride) which removes the copper from the non-tract areas of the board Prepared by: CESAR MENDOZA-Applied Technology Teacher

  12. Stage 5: Tinning Tinning is used to protect the copper tracts from humidity TINNING TANK Prepared by: CESAR MENDOZA-Applied Technology Teacher

  13. Stage 6: Drilling In this stage, drill bits are used to drill 1.0 mm holes the mounting of components. Prepared by: CESAR MENDOZA-Applied Technology Teacher

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  15. PCB Equipment The PCB Workshop is equipped with the following equipments: Mega PCB Lab Station Exposure Unit PCB Cutter Drill Edge Rounder Prepared by: CESAR MENDOZA-Applied Technology Teacher

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  20. Thank you for listening Prepared by: CESAR MENDOZA-Applied Technology Teacher

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