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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. - PowerPoint PPT Presentation
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Module 5: PCB Fabrication
Prepared by:
Cesar MendozaApplied 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.
• 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
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
Basic functions of a PCBThe basic functions of a printed circuit board are (see Figure 5.2):
1. To provide electrical connection between the points those need to be interconnected;
2. To provide insulation between the tracks and other points that need to be isolated;
3. To provide necessary mechanical support to the components mounted on the board;
4. To reduce size and cost, provide better performance and reliability.
Prepared by: CESAR MENDOZA-Applied Technology Teacher
PCB Basic Functions
Prepared by: CESAR MENDOZA-Applied Technology Teacher
PCB basic
functions
provide electrical
connectionprovide insolatio
n
mechanical support
smaller size
better performan
e
less cost
reliable
Prepared by: CESAR MENDOZA-Applied Technology Teacher
COPPER CLAD PCB without Components
PCB with Components
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Resist Cover
Etch Resist
Copper Layer
PVC Base
PCB –Copper Clad
PCB Fabrication Steps
Prepared by: CESAR MENDOZA-Applied Technology Teacher
PREPARING THE ARTWORKThe artwork can be prepared manually or by using the softwareTINA software is used to prepare the artwork in PCBThe circuit is prepared in TINA and the artwork printed on a transparent sheet
Stage 2. Exposure
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Exposure- the first stage in transferring the artwork pattern onto the PCB
1. The artwork is aligned with the copper clad board2. Places in the Ultraviolet (UV) and exposed for 2
minutes3. The UV light will print and protect the etch resist ink
on the tracts
Stage 3: Developing and Rinsing1. In this stage, the etch resist ink is removed from the
unwanted areas of the PCB leaving the tracts.2. The PCB is immersed in a developing solution and the
unwanted etch resist ink is brushed away.3. The PCB is rinsed to make design more clear.
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Stage 4: Etching
Prepared by: CESAR MENDOZA-Applied Technology Teacher
The PCB is immersed in the Etching solution (Ferric Chloride) which removes the copper from the non-tract areas of the board
Stage 5: Tinning
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Tinning is used to protect the copper tracts from humidity
TINNING
TANK
Stage 6: Drilling
Prepared by: CESAR MENDOZA-Applied Technology Teacher
In this stage, drill bits are used to drill 1.0 mm holes the mounting of components.
Prepared by: CESAR MENDOZA-Applied Technology Teacher
PCB EquipmentThe PCB Workshop is equipped with the following equipments:
1. Mega PCB Lab Station2. Exposure Unit3. PCB Cutter4. Drill5. Edge Rounder
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Thank you for listening
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Prepared by: CESAR MENDOZA-Applied Technology Teacher
Prepared by: CESAR MENDOZA-Applied Technology Teacher