![]() The output is a transistor pin number 6 is Base terminal, pin number 5 is Collector terminal and pin number 4 is Emitter terminal, so checking method it has the same method as transistor checking. The dot on ICs body mean that the first pin start from that. 1 is Anode and terminal number 2 is cathode, this case, we will check it by using the same method as LED checking. After researching with datasheet we know input is LED For through hole type such as DIP-6 which has 6 pin DIP-4 which has 4 pin etc. There are many package of Optocoupler, briefly, through hole and SMD. How to check Optocoupler it depends on device type inside the ICs. Optocoupler has many part number, different part number has different output type so before checking it has to use part number to research with datasheet and find input type and output type. OPTO COUPLER TESTING Optocoupler is one type of ICs, It isolates input and output section by using optical technology this feature increase safety of circuit. HD74LS00P pining arrangement ( different ICs part number has different VCC pin allocation ) Set multimeter to resistor test function then connect as shown on photo, measure, and read resistance value. I will use ICs part number HD74LS00P for example testing. Some ICs has many VCC and ground pin, you to check all VCC pinning and it must be good condition for all VCC. Take ICs part number that marked on its body to find pinning function on datasheet, find where is VCC and ground pin locate. As inside the ICs there is some circuit, it need voltage to supply and the circuit inside must not " short circuit " and " open circuit" these is the basic condition for good ICs, we will apply this to check ICs and describe below. VCC and ground terminal resistance checking. ![]() Including Vcc of ICs should be value as its rated voltage.Ģ. If you have oscilloscope and know how circuit is working such as input, output ,condition to on and off, type of signal then you can consider it as block diagram and section to test.Īt the ICs you will check input voltage is present or not, output occur after the input switch on/off or not. ![]() On datasheet will present electrical characteristic, test graph for designer and checking, pin arrangement function, sizing for installation and safety advice.ġ) On circuit testing. ![]() For special purpose ICs you can check with ICs maker how to check and test it, test guide and specification data can get these from datasheet type ICs part number on google search by this you will find datasheet as PDF file. On this article I will refer to standard ICs that we always find it at common circuit and I will use standard ICs for example testing. ICs has many type, style, including its complexity. ICs is a circuit and there are many small electronic components inside it. ![]()
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