X-ray inspection
helps identify defects in wiring assemblies, semiconductor packaging, voids in solder joints, BGA solder defects, etc. Automated Optical Inspection (AOI): In this method, the circuit board is scanned using a single or multiple video cameras. The camera clicks images of the components at various angles.
How do you identify PCB components?
- Start by identifying the printed circuit board, or PCB. …
- Identify other “nuts and bolts” electronic circuit components. …
- Locate the circuit board’s battery, fuses, diodes and transistors. …
- Locate the processor, or processors.
How do you know if your PCB is damaged?
Often, circuit boards deployed in the field are damaged by electrical surges and there are telltale signs on the PCB. Look for a burnt spot, particularly on the power supply module or I/O and connectivity ports.
Pay attention to cracked ICs, broken traces
, and blown capacitors.
What are the different defects in soldering?
- Pin/Blow Hole.
- Bulbous Joint.
- Cracked Joint.
- Lifted Component.
- Flux Residues.
- Incomplete Joint.
- Poor Hole Fill.
- Joint Contamination.
How do you trace faults in a circuit?
One of the main uses for
multimeters
whether they are analogue multimeters or digital multimeters, DMMs is to test and fault find circuits like those in a transistor radio. Multimeters are ideal items of test equipment for finding many faults in a transistor or other form of electronic circuit.
Can a PCB be repaired?
Luckily, it’s
possible to repair
or remanufacture boards to make them like new again. This does one of two things. Either the board in question can be returned to its original device, making it function again. Or, it can be used in a completely different device, as a form of recycling if you will.
What causes a PCB to fail?
Environmental Factors: Exposure to heat, dust and moisture, accidental impact (drops and falls), and power overloads/surges can be causes of circuit board failure. However, the most damaging cause of premature circuit board failure is
electrostatic discharge (ESD)
at the assembly stage.
What is PCB and its components?
Printed circuit boards
(PCB) components are made up of a variety of complex electrical elements, including resistors, capacitors, diodes, transistors and fuses.
What are main components of PCB?
- Resistors. Resistors are one of the most crucial and common components in a PCB. …
- Transistors. A transistor is simply an amplifier used to switch or control the electronic signals in a board. …
- Capacitors. …
- Inductors. …
- Transformers. …
- Diodes. …
- Sensors.
What components are on a PCB?
- Battery: provides the voltage to the circuit.
- Resistors: control the electric current as it passes through them. …
- LEDs: light emitting diode. …
- Transistor: amplifies charge.
- Capacitators: these are components which can harbour electrical charge.
What is the name of soldering method?
Brazing (>450 °C)
– This type of soldering uses a metal with a much higher melting point than those used in hard and soft soldering. However, similarly to hard soldering, the metal being bonded is heated as opposed to being melted.
Does solder get old?
Solder manufacturers say
yes solder has a shelf life (~ 6 months for leaded solder, ~1 year for non-leaded)
. They have to certify that their solder will have specific characteristics when used by a company to make, say, 10,000 radio units. Large companies buy solder in bulk.
Which checking is important in soldering?
It’s important to check with
your PCB assembly supplier
to understand the technology involved in their soldering process and in solder joint inspection. If your supplier doesn’t invest in a sophisticated machine or relies only on manual inspection (a.k.a. bare eyes inspection), you could be in for a rough ride.
What are the tools for fault detection?
- Voltage Indicator: This instrument is to check whether the voltage exists across two points in a circuit. …
- Electric Current Tester: …
- Continuity Tester: …
- The Oscilloscope: …
- Insulation Tester: …
- Soldering Iron:
What is the six point fault finding technique?
The six point fault finding technique has six steps: 1. Test the system, i.e. make measurements or collect other evidence, 2. Analyse the reading, 3.
Locate fault based on analysis
, 4.
What are the fault finding techniques?
- Collect the Evidence. All the evidence collected must be relevant to the problem in hand. …
- Analyse the Evidence. …
- Locate the Fault. …
- Determination and Removal of the Cause. …
- Rectification of the Fault. …
- Check the System.
