Electronics > Repair

Help identify glass encapsulated diodes

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fzabkar:
You can have some confidence in your decoding of the part markings if the datasheets for Q23 and Q24 indicate that they are complementary PNP and NPN BJTs.

晓看风云:

--- Quote from: Kim Christensen on August 26, 2024, 06:12:52 pm ---That's the problem with surface mount components. XL can mean many things.

--- End quote ---
(I'm sorry that the code Q23 misled you, and I sincerely apologize again!) Yes, it's strange that when I removed XL from the circuit board, the diode characteristics between pins 1 and 2 still fluctuated like 0.06-0.08. But when I measured them again after a while, they changed to 0.300-0.500 occasionally, which is a strange phenomenon. I searched everywhere, and only 2SD2704K meets the criteria. I have already ordered it, and I will not rashly install them on the circuit board until I am completely sure that 2SD2704K is the correct model. Acting rashly will only lead to the expansion of the malfunction, which is not what I want to see!

晓看风云:

--- Quote from: fzabkar on August 26, 2024, 06:19:27 pm ---You can have some confidence in your decoding of the part markings if the datasheets for Q23 and Q24 indicate that they are complementary PNP and NPN BJTs.

--- End quote ---
You can take a look at my other latest reply messages. I am very sorry for the inconvenience caused by the code Q23. The component of the silk screen XL is not included in the circuit diagram I provided, it is located elsewhere. I haven't found any problems with the circuit around LT1007 so far. I won't find any problems here for the time being. I will go to other places to seek the fault phenomenon, such as this XL screen printed switch transistor calibrated with Q!

Kim Christensen:
Hmmm... It could be a MOSFET. If you leave the gate floating and do a diode check between drain and source, you will get readings that drift. Shorting the gate to the source will make the drain-source measure open, or as a diode if measured in reverse.

fzabkar:
The mark might be "KL" ...

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