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Basic Mnemonics for Circuit Board Repair
A typical circuit board is composed of millions of circuits.
The appearance of components often changes; recognizing characters is key.
Resistors and capacitors are the most common; damage is also very prevalent.
Resistance values of resistors can easily change; capacitors can leak charge and current.
Inductors and transformers are coils; simple tests can check for continuity.
Diodes and transistors; measure the PN junction both forward and reverse.
MOSFETs and thyristors; triggering tests are crucial.
All of the above are discrete components; integrated circuits have been around for many years.
Analog devices include operational amplifiers; use virtual short and virtual ground to judge.
Optocouplers isolate the front and back stages; damage can be very common.
Digital devices are often seen; 40 and 74 series are common.
Also, there are analog-to-digital converters; testing can be quite labor-intensive.
Don’t forget ROM and CPLD; programming requires a programmer.
CPUs and microcontrollers; timing judgment is done with a logic analyzer.
Various sensors are very common; the likelihood of damage ranks first.
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