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Author Topic: Transistor 4F3 Marking  (Read 574 times)

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Offline 2XTopic starter

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Transistor 4F3 Marking
« on: June 01, 2022, 09:32:07 pm »
Hello,
I have a PCB for an Air Condition unit where two transistors blow. As I saw from a picture that a friend send me the one it has a marking 4F3 and the other CQ43... does anyone knows what transistors are.. I can't find any datasheet and I can't understand what type the transistors were and which pin is B-C-E. The Q14 transistor connected at the anode of the D22. Also, I don't find the role of the D16 and D22 diodes in the circuit.
The Air Condition brand is Hitachi and the model of the PCB is PI023-2 (I couldn't find any schenatic - If anyone knows where can I find the schematic please inform me).

« Last Edit: June 01, 2022, 09:40:22 pm by 2X »
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Offline fzabkar

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Re: Transistor 4F3 Marking
« Reply #1 on: June 02, 2022, 05:21:17 am »
« Last Edit: June 02, 2022, 05:24:43 am by fzabkar »
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Offline gamalot

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Re: Transistor 4F3 Marking
« Reply #2 on: June 02, 2022, 06:26:30 am »
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