Cblm for Pcb

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ELECTRONIC PRODUCTS ASSEMBLY AND SERVICING NCII ELECTRONIC PRODUCTS ASSEMBLY AND SERVICING NCII

COMPETENCY-BASED LEARNING MATERIALS COMPETENCY-BASED LEARNING MATERIALS

List of

List of CompetenciesCompetencies

No.

No. Unit Unit of of Competency Competency Module Module Title Title CodeCode 1

1 Assemble ElectronicAssemble Electronic Products

Products

Assembling Electronic Assembling Electronic

Products

Products ELC724335ELC724335 2

2

Service consumer Service consumer electronic products and electronic products and

systems systems

Servicing consumer Servicing consumer electronic products and electronic products and

systems systems ELC724336 ELC724336 3 3 Service industrial Service industrial electronic modules, electronic modules, products and systems products and systems

Servicing industrial Servicing industrial electronic modules, electronic modules, products and systems products and systems

ELC724337 ELC724337

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LEARNING

LEARNING OUTCOME OUTCOME # # 2 2 PREPARE/MAKE PCB PREPARE/MAKE PCB MODULEMODULE CONTENTS:

CONTENTS: 1.

1. Procedure Procedure in in PCB PCB Designing.Designing. 2.

2. Procedure Procedure in in PCB PCB Layouting.Layouting. 3.

3. Procedure in PCB EtchingProcedure in PCB Etching 4.

4. Procedure in PCB DrillingProcedure in PCB Drilling ASSESSMENT CRITERIA:

ASSESSMENT CRITERIA: 1.

1. PCB layout is verified for conformity with the schematic diagram inPCB layout is verified for conformity with the schematic diagram in accordance with the layout rules

accordance with the layout rules 2.

2. PCB layout is PCB layout is transferred to copper-cladded board followingtransferred to copper-cladded board following acceptable methods and standards

acceptable methods and standards 3.

3. Visual inspection is performed based on standards procedures.Visual inspection is performed based on standards procedures. 4.

4. Thru-hol Thru-hole is drilled be is drilled based on standased on standards procedureards proceduress 5.

5. PCB is cleaned based on standards proceduresPCB is cleaned based on standards procedures 6.

6. Functionality of PCB is tested and visual inspection is performedFunctionality of PCB is tested and visual inspection is performed based on

based on standards proceduresstandards procedures CONDITION:

CONDITION:

Students/trainees must be provided with the following: Students/trainees must be provided with the following: 1.

1. WORKPLACE LOCATIONWORKPLACE LOCATION 2.

2. EQUIPMENTEQUIPMENT

-- Desktop ComputerDesktop Computer -- Laptop ComputerLaptop Computer -- LCD ProjectorLCD Projector -- Televis Televisionion -- DVD playerDVD player

-- MultitesteMultitester r (VOM)(VOM) 3.

3. TOOLS, ACCE TOOLS, ACCESSORIES AND SSSORIES AND SUPPLIESUPPLIES -- White boardWhite board

-- Set of screw driversSet of screw drivers -- Set of PliersSet of Pliers

4.

4. TRAINING MATE TRAINING MATERIALSRIALS -- Whiteboard markerWhiteboard marker -- Ball pensBall pens

-- Log Log book/bond book/bond paperspapers -- Information sheetInformation sheet

-- Task she Task sheetet

-- Assembled variable regulated power supply.Assembled variable regulated power supply. ASSESSMENT METHOD:

ASSESSMENT METHOD:



 Written examinationWritten examination 

 DemonstrationDemonstration 

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Learning Guide Learning Guide Learning Outcome 2 Learning Outcome 2 PREPARE/MAKE PCB MODULE PREPARE/MAKE PCB MODULE Learning

Learning Steps Steps SpecialSpecial

Instructions/Refer Instructions/Refer

ences ences

■

■ ReadRead the information the information

sheet 1.2-1 on sheet 1.2-1 on

Procedure in PCB Procedure in PCB designing

designing Read Read InformationInformation Sheet and answer Sheet and answer the self-check. After the self-check. After answering, compare answering, compare your answer from your answer from the answer key.

the answer key. Perform the Perform the activity required in activity required in the task sheet and the task sheet and evaluate your work evaluate your work according to the according to the performa

performance criteriance criteria checklist. Make the checklist. Make the necessary necessary corrections or corrections or improvements. improvements. Secure the Secure the evaluation of the evaluation of the trainer and let trainer and let

him/her record your him/her record your accomplishment. accomplishment. Answer

Answer Self-check 1.2-1 on Procedure in PCB Self-check 1.2-1 on Procedure in PCB designing.

designing. Compare

Compare to answer key 1.2-1. to answer key 1.2-1. Perform

Perform activity sheet 1.2-1 activity sheet 1.2-1 Evaluate

Evaluate students’ performance using performancestudents’ performance using performance checklist 1.2-1

checklist 1.2-1 Read

Read the the informatiinformation sheet on sheet 1.2-2 Procedure 1.2-2 Procedure in PCBin PCB lay outing

lay outing Answer

Answer Self-check Self-check 1.2-2 1.2-2 on on Procedure Procedure in in PCB PCB laylay outing

outing Compare

Compare to answer key 1.2-2 to answer key 1.2-2 Perform

Perform activity sheet 1.2-2 activity sheet 1.2-2 Evaluate

Evaluate students’ performance using performancestudents’ performance using performance checklist 1.2-2

checklist 1.2-2 Read

Read the the informatiinformation sheet on sheet 1.2-3 Procedure 1.2-3 Procedure in PCBin PCB Etching

Etching Answer

Answer Self-check Self-check 1.2-3 1.2-3 on on Procedure Procedure in in PCBPCB Etching

Etching



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Read the information sheet 1.2-4 Procedure in PCB drilling

Answer Self-check 1.2-4 on Procedure in PCB drilling

Compare to answer key 1.2-4 Perform activity sheet 1.2-4

Evaluate students’ performance using performance checklist 1.2-4

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Information Sheet 1.2.1 Procedure in PCB Designing Learning Objectives:

After reading this INFORMATION SHEET, YOU MUST be able to: 1. Acquire knowledge how to design printed circuit board.

2. Perform Printed circuit board designing using the circuit diagram of variable regulated AC/DC power supply.

3. Understand the importance of printed circuit board designing in making PCB module

A printed circuit board (PCB) has components inserted into the hole and soldered to form its circuit connection. Its main purpose is to reduce the space and to troubleshoot easily when problem arises.

The printed circuit board (PCB) has conductors that are thin

strip of copper,

usually bonded to a baseboard called substrate. There are two very common

substrate materials used in printed circuit, the phenolic and epoxy plastic.

Copper Substrat e

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1. PCB size and shape. The PCB must be big enough for the entire component to be mounted where it is anticipated.

2. Position of the Terminal. Input, output and supply voltage if possible should be placed near the border for easier way during troubleshooting or minor repair.

3. High Temperature Dissipation. Too much heat is the number one problem of all components. Bigger space is needed so that heat sink can be provided to the component. This will protect the component from burning up.

4. Accessibility of Components. This component that is adjustable or variable (example: potentiometer, trimmer resistor or capacitor) should be placed near the border to make the troubleshooting or minor repair easier.

5. Space for Bolt and Nut. The designer should place an allowance for mounting the PCB with bolt and nut in securing the entire board to the chassis.

6. Different Types of Circuit Should be grouped according to its Application. This will enhance the circuit operation and will prevent it from distortion generated by other circuit. This is the reason why the circuit of the power supply is far from the audio circuit.

Procedure in PCB designing

1. Prepare the tools and materials needed in lay outing and designing a PCB

Tools and materials needed:

 _Ruler

 _{Utility cutter}

 _{Permanent marker}  _{Pencil and Eraser}

 _{Graphing paper and a piece of bond paper (short)}  _{Masking Tape}

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2. Prepare the schematic diagram of the circuit.

Schematic diagram of Variable regulated AC/DC power supply 3. Make the PCB design. Arrange the components terminals on a

graphing paper or a piece of paper to show/illustrate the interconnection of the components based on the schematic diagram given.

Example position of the pads or terminals of the components 4. Interconnect the traces to the pads/terminals of the components

depending on the connections of the components to one another. Make sure that the traces will be the same as the connection of the schematic diagram.

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5. Finalized your design with the actual size of the component, terminals and size of the PCB (1 ½ ” x 2”) to check the spacing of the components. It should not be on top of the other components. 6. Let your work check by the trainer.

SELF-CHECK 1.2-1 Direction: Identify the following items.

1. A board that is open with electronic components is mounted and soldered.

2. A conductor where the component’s terminal lead is soldered.

3. It consists of a thin copper layer which is firmly bonded to an insulating base material. It is sometimes called as a component side.

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ANSWER KEY 1. 2-1

1. PCB

2. Substrate

3. Copper foil side 4. Epoxy

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ACTIVITY SHEET 1.2-1 Title: Procedure in PCB Designing

Performance Objective: Given the ACTIVITY SHEET 1.2-1, you should be able to perform procedure in PCB designing for variable regulated AC/DC power supply circuit diagram

Supplies/Materials : Activity Sheet 1.2-1, piece of paper pencil or ball pen, circuit diagram of variable regulated AC/DC power supply

Equipment : N/A

Steps/Procedure:

Procedure in PCB designing

1. Prepare the tools and materials needed in lay outing and designing a

PCB

Tools and materials needed:

 Ruler

 Utility cutter

 Permanent marker  Pencil and Eraser

 Graphing paper and a piece of bond paper (short)  Masking Tape

2. Prepare the schematic diagram of the circuit.

3. Make the PCB design. Arrange the components terminals on a

graphing paper or a piece of paper to show/illustrate the

interconnection of the components based on the schematic diagram given.

4. Interconnect the traces to the pads/terminals of the components

depending on the connections of the components to one another. Make sure that the traces will be the same as the connection of the schematic diagram.

5. Finalized your design with the actual size of the component, terminals

and size of the PCB (1 ½ ” x 2”) to check the spacing of the components. It should not be on top of the other components.

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7. Discuss your answers with the trainer

8. Apply the safety precautions following the OH&S policies and Procedures

Assessment Method:

Written - Oral Questioning Performance Criteria checklist

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Performance criteria checklist 1.2-1 CRITERIA

Did you…. YES NO

1. Interconnect base on the schematic diagram? 2. Used appropriate tools and materials in PCB

designing?

3. Position the terminals not overlapping to each components?

4. Used correct PCB size?

5. Position the terminal of the input , output and auxialliary components accessible?

6. Provide space for the bolts and nuts? 7. Provide proper grounding on your design?

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INFORMATION SHEET 1.2-2 Procedure in PCB Lay-outing Learning Objectives:

After reading this INFORMATION SHEET, YOU MUST be able to: 1. Acquire knowledge how to layout printed circuit board.

2. Perform Printed circuit board layout using the circuit diagram of variable regulated AC/DC power supply.

3. Understand the importance of printed circuit board layout in making PCB module

In every electronic activity specially PCB layout can be performed (using CAD ) or in combination with an Autorouter, The results are usually still achieved using at least some manual routing – simply because the design engineer has a far better judgement of how arrange circuitry.Surprisingly, many autorouted boards are often illogical in track routing – the program has optimized the connections an sacrificed any small amount of order that may have been put in place by manual routing. Generally autorouted boards are somewhat harder for a technician to repair debug; for this reason. Historically, PCBs used to be laid out by using stick on paper shapes and ape on mylar drafting film, - that really WAS manual routing.

Procedure in Lay outing

1. Using a permanent marker, art transfer or masking tape for layout the design on the PCB. Follow the procedure on how to trace the path of the connection traces from the schematic diagram.

2. Be wise on positioning the terminals or the pads of the components and avoid shorting the traces of the connections.

3. Double check your design, make sure that all of the connections are the same as the connections on the schematic diagram.

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CBLM on Electronic Products Assembly

and Servicing NCII (Assemble Electronic

Date Developed:

Document No. 1 Issued by:

Page 14 of 35

Developed By: Revision No. 0

5. Let your trainer check your design work before the etching process. SELF – CHECK 1.2- 2

Direction : Answer the following questions and write your answers in separate sheet of paper.

1. What should be consider in PCB layout?

2. This will protect the component from burning up?

3. The _______ layout must be accessible to all Components? 4. The layout should place an allowance for mounting the PCB?

5. What do you call the status where excessive heat is the number one problem of all components?

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ANSWER KEY 1.2-2 1. Size

2. Space 3. PCB

4. Bolts and Nuts

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Date Developed:

Page 16 of 35

ACTIVITY SHEET 1.2-2 Title: Procedure in PCB Layouting

Performance Objective: Given the ACTIVITY SHEET 1.2-2, you should be able to perform procedure in PCB lay outing for variable regulated AC/DC power supply circuit diagram

Supplies/Materials : Activity Sheet 1.2-2, piece of paper pencil or ball pen, circuit diagram of variable regulated AC/DC power supply

Equipment : N/A Steps/Procedure:

Procedure in PCB Layouting

1. 1 Using a permanent marker, art transfer or masking tape for layout the design on the PCB. Follow the procedure on how to trace the path of the connection traces from the schematic diagram.

1. 2 Be wise on positioning the terminals or the pads of the components and avoid shorting the traces of the connections. 1. 3 Double check your design, make sure that all of the

connections are the same as the connections on the schematic diagram.

1. 4 Make sure that the components size are seized so the components will not be on top of the other in mounting procedure.

1. 5 Let your trainer check your design work before the etching process.

Assessment Method:

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Performance Criteria Checklist 1.2-2

Did you.... YES NO

1. Finalized your layout with the actual size of the component, terminals and size of the PCB?

2. use appropriate materials in layouting your design on the PCB?

3. position the terminals or the pads of the components to avoid shorting the traces of the connections?

4. Double check your Layout or make sure that all of the connections are the same as the connections on the schematic diagram?

5. measure the actual size of the component so it will not be on top of each other?

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Date Developed:

Page 18 of 35

INFORMATION SHEET 1.2-3 Procedure in PCB ETCHING Learning Objectives:

After reading this INFORMATION SHEET, YOU MUST be able to:

1. Acquire knowledge how to etch printed circuit board.

2. Perform Printed circuit board etching using the materials n eeded

in PCB etching.

3. Understand the importance of printed circuit board etching in

making PCB module

Printed Circuit Board Etching is where the excess copper is removed to leave the individual tracks or traces as they are sometimes called. Buckets, bubble tanks, and spray machines are tools to do different ways of etching but most firms currently use high pressure conveyors spray equipment. Spray etching is fast Ammoniacal etching solutions when sprayed can etch 55 microns of copper a minute. Less than 40 seconds to etch a standard 1 oz, 35 micron circuit board.

Many different chemical solutions can be used to etch circuit boards ranging from slow controlled speed etches used for surface preparation to the faster etches used for etching the tracks. Some are best used in horizontal spray process equipment while others are best used in tanks. Enchants for PTH work have to be selective and be non-aggressive to tin / tin lead plating, which is used as the etch resists. Copper etching is normally exothermic where high speed etching is carried out solution cooling is normally required. This is normally done by placing titanium water cooling coils into the enchant. Almost all etching solutions liberate toxic corrosive fumes. Extraction is highly recommended. All enchants are corrosive and toxic mainly due to the high metal content. P.P.E. Personal Protection Equipment must

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Ferric chloride

always be used. Spent solutions should always be disposed properly and not to be spilled down local drains where they can pollute local sewage works and rivers.

Printed Circuit Board Etching

It is the removal of unwanted portion or layer of conductive materials (that is copper) bonded to an insulating base called substrate. By using a chemical reaction to the copper called ferric chloride, it liquefies the uncovered surfaces of the designed copper clad board that creates a PCB.

Tools and Materials Needed In PCB Etching 1. Designed PCB

2. A bottle of the Ferric Chloride. (The quantity of bottle will depend upon the area of the PCB).

3. Plastic Basin. It is the medium of ferric chloride

4. Popsicle sticks (2 pieces). It is used for hauling the designed PCB. 5. Old newspaper. It is placed under the plastic basin for the

prevention of accidental spill of chemical over the table.

6. Apron

7. Piece of Cloth

8. Plastic Varnish 1 bottle 9. Lacquer Thinner

10. Surgical Gloves 11. Knife or Cutter

PROCEDURE IN PCB ETCHING

1.

Prepare the necessary tools and materials needed in PCB etching.

2.

Wear your apron and surgical gloves in order to prevent accidental splash of the solution on your clothes or on your skin.

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Date Developed:

Page 20 of 35

Immerse PCB in plastic basin filled with ferric chloride

Basin

PCB

chloride until the uncovered part of the copper clad is totally etched.

5.

After 10 - 15 minutes, check the PCB if all the parts needed to be removed are totally etched (using the two Popsicle sticks in hauling). If not yet, return it into the plastic basin filled with ferric chloride. After 3 - 5minutes check it again.

6.

Haul the PCB from the plastic basin and wash it in a free flowing water to remove the remaining residue in the PCB.

7.

With a clean and dry piece of cloth, wipe the wet PCB.

8.

Pour a little amount of lacquer thinner on a clean dry piece of cloth and wipe the markings of the permanent marker pen in the copper clad. (Note: In doing this, you should wear your surgical gloves.)

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PCB

9.

Aided by bright light, inspect the PCB for possible hairline break or short. If there is a hairline path between the copper

conductors, cut it by a knife or cutter. And if there is a break between the copper conductors, solder it.

10.

Apply plastic varnish to the newly etched PCB to prevent corrosion or rust, and let it dry before touching it.

Techniques to correct PCB Hairline Break or Short

A. Hairline Break. It is an open copper foil in the Printed Circuit Board. Most of the time this is due to improper PCB designing or etching. To

eliminate the hairline break, just place a hook up wire and solder it.

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Date Developed:

Page 22 of 35

circuit board designing or etching is done improperly. To eliminate the hairline short, you should cut it with a knife.

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SELF CHECK 1.2-3 Procedure in PCB ETCHING

Direction : Answer the following questions and write your answers in separate sheet of paper,

1. What is the method called by removing unwanted copper in the PCB?

2. What material is used, that protects parts of the laminate from the acid and leaves the desired copper layer untouched?

3. At least how many minutes the PCB is in the basin with acid? 4. What is the chemical solution use in PCB Etching?

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Date Developed:

Page 24 of 35

ANSWER KEY 1.2-3

1. Etching

2. Masking tape

3. 20 minutes

4. Ferric Chloride

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ACTIVITY SHEET 1.2-3 Title: Procedure in PCB Etching

Performance Objective: Given the ACTIVITY SHEET 1.2-3, you should be able to perform procedure in PCB Etching for variable regulated AC/DC power supply circuit diagram

Supplies/Materials : Activity Sheet 1.2-3, ferric chloride, basin, designed PCB, rags, water, popsicle stick, newspaper, utility cutter and PPE.

Procedure in PCB Etching

1. Prepare the necessary tools and materials needed in PCB etching.

2. Wear your apron and surgical gloves in order to prevent accidental splash of the solution on your clothes or on your skin.

3. Pour the ferric chloride in the plastic basin

4. Etch the PCB by immersing it in a basin filled with ferric chloride until the uncovered part of the copper clad is totally etched.

5. After 10 - 15 minutes, check the PCB if all the parts needed to be removed are totally etched (using the two Popsicle sticks in hauling). If not yet, return it into the plastic basin filled with ferric chloride. After 3 - 5

minutes check it again.

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Date Developed:

Page 26 of 35

8. Pour a little amount of lacquer thinner on a clean dry piece of cloth and wipe the markings of the permanent marker pen in the copper clad. (Note: In doing this, you should wear your surgical gloves.)

9. Aided by bright light, inspect the PCB for possible

hairline break or short. If there is a hairline path between the copper conductors, cut it by a knife or cutter. And if there is a break between the copper conductors, solder it.

10.Apply plastic varnish to the newly etched PCB to prevent corrosion or rust, and let it dry before touching it.

11.Apply the safety precautions following the OH&S policies

and Procedures

Assessment Method:

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Did you.... Yes No

1. Use appropriate PPE while performing the etching activity?

2. Etch your designed PCB following the procedure correctly?

3. Fix any hairline short or hairline break on your PCB?

4. Apply proper safety precaution while performing the activity?

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Date Developed:

Page 28 of 35

INFORMATION SHEET 1.2-3

Procedure in Drilling

Learning Objectives:

After reading this INFORMATION SHEET, YOU MUST be able to: 1. Acquire knowledge how to drill printed circuit board. 2. Perform Printed circuit board drill using the Mini – drill.

3. Understand the importance of printed circuit board drill in making PCB module

Drilling is a cutting process that uses a drill beat to cut a hole of circular cross section in solid material, the drill beat is rotary cutting tools, often multi point, the beat is pressed against the work piece and rotated at rates from hundreds to thousands of revolution per minute. This forces the cutting edge against the work piece, cutting off chips (swarf) from the hole as it is drilled. Exceptionally, specially-shaped bits can cut holes of non-circular cross-section; a square cross-section is possible,

How to set – up Mini Drill

1. Loosen the chuck by using a long metal tool and change the drill bit. This is done in a counter clockwise movement.

Drill Bit Long Metal

Mini Drill

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2. Insert the drill bit 1mm diameter in size and attach it to the chuck of the unit.

3. Turn the long metal tool clockwise to tighten the jaw of the unit. Be sure that the drill bit is well secured on the chuck.

4. Before inserting the 12 volts adaptor, you should turn off the unit.

5. Test the rotation of the unit if it is well aligned. If not, align it following the steps no. 1 and 2.

How to Use a Mini Drill

To control the unit, hold the mini - drill at the lower part and firmly position your arm. Then with the mini drill held perpendicularly to your work surface, lightly press downward to the holes to be drilled in the PCB but be sure that the PCB has a piece of wood under it to avoid damaging the table. With practice, you will be able to get the procedure correctly.

PROCEDURE IN DRILLING 1. Prepare all the materials needed.

- Mini drill PCB

MINI DRILL

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Date Developed:

Page 30 of 35

2. Mark where the holes are to be drilled.

3. Using the mini drill, bore hole perpendicularly to the surfa ce of the PCB. 4. Clean the surface of the PCB and look for open line or short circuit.

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SELF CHECK 1.2-4

Direction : Answer the following questions and write your answers in separate sheet of paper.

1. What is the material use in PCB drilling?

2. What do you called the process of cutting using the drill beat? 3. Mark where the __________ are to be drilled?

4. What should be the position of the hole to the surface of the PCB? 5. What liquid form is used to prevent it from corrosion?

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Date Developed:

Page 32 of 35

Answer Key 1.2-4 1. PCB 2. Drilling 3. Hole 4. Perpendicularly 5. Varnish

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ACTIVITY SHEET 1.2-4 Title: Procedure in PCB Drilling

Performance Objective: Given the ACTIVITY SHEET 1.2-4, you should be able to perform procedure in PCB Drilling for variable regulated AC/DC power supply circuit diagram

Supplies/Materials : Activity Sheet 1.2-4, 12v Mini Drill designed etched PCB, and PPE.

Procedure in PCB Drilling

1. Prepare all the materials needed. - Mini drill

- Designed etched PCB

2. Mark where the holes are to be drilled.

3. Using the mini drill, bore hole perpendicularly to the surface of the PCB.

4. Clean the surface of the PCB and look for open line or short

circuit.

5. Apply varnish on the clad surface to prevent it from

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Date Developed:

Page 34 of 35

Did you.... Yes No

1. Use appropriate PPE while performing the drilling activity?

2. Drilled your designed etched PCB following the procedure correctly?

3. Clean your PCB after drilling?

4. Apply proper safety precaution while performing the activity?

5. Use appropriate tools while performing the activity? Assessment Method: