Basic tips for circuit board repair

- Jan 02, 2020-

Basic tips for circuit board repair


 A common circuit board, the circuit is combined into ten million,


The appearance of the component often changes, and the character recognition is the key


Resistance and capacitance are the most common, and damage is also very common


The resistance value is easy to change, and the leakage capacitance of the capacitor is also leaking.


Inductive transformer is a coil


Diode and triode, measure the positive and negative of the PN junction


MOS tube and thyristor, trigger test is the key


The above are discrete parts, integrated circuits for many years


Analog devices have op amps, virtual short and virtual ends to judge


The optocoupler isolates the front and rear stages, and the damage is tens of millions


Digital devices are often seen, in front of 40 and 74


There is also an analog-to-digital converter, which is very laborious to test


Don't forget ROM and CPLD, programming depends on programmer


CPU, microcontroller, timing judgment logic instrument


Various sensors, ranking first in damage probability


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