Electronics > Repair

Help identify glass encapsulated diodes

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晓看风云:

--- Quote from: fzabkar on August 26, 2024, 06:40:20 pm ---The mark might be "KL" ...

--- End quote ---
There are many components in the circuit that are silk screened as XL. Based on most of the others, I prefer XL. What do you think?

晓看风云:

--- Quote from: Kim Christensen on August 26, 2024, 06:29:24 pm ---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.

--- End quote ---
Because I am currently unable to determine the specific pin situation, and I am also unsure if it is functioning properly. Assuming the pin arrangement is as shown in the attached diagram, it will help me explain. When I put the red pen on foot 3 and the black pen on foot 1 or 2, both display a pressure drop of 0.698. Placing the probe in reverse is OL. Another type of measurement is the black probe 1 or 2 and the red probe 1 or 2. The multimeter gave me feedback on a very strange state, constantly flashing, and I couldn't even see its changes, probably flashing back and forth between 2.000-1.9-1.8 and gradually decreasing open.

fzabkar:
The stylised "C3" marking appears to be Toshiba's, if this supplier is to be believed:

https://www.mscnelectronics.com/home/produto/codigo:12213/smd-di-1ss226-100ma-80v-ultra-high-speed-switching-diodes-diodo-smt

https://www.mscnelectronics.com/upload/Produto12213.grande.71aef49d58c5126b7c1e49ac865f47b1.jpg

Therefore, I would look for an "XL" or "KL" part by Toshiba.

My advice is to try to view the circuit as functional blocks instead of testing each individual component.

For example, the previous circuit could be seen as the following:

https://handwiki.org/wiki/images/7/7f/Pushpull_%28English%29.png

All you would need to do to verify that circuit would be to vary the input to the op-amp above and below ground (by operating the appliance/device), and then observe the output at the junction of the two current sense resistors.

晓看风云:

--- Quote from: fzabkar on August 26, 2024, 07:10:16 pm ---The stylised "C3" marking appears to be Toshiba's, if this supplier is to be believed:

https://www.mscnelectronics.com/home/produto/codigo:12213/smd-di-1ss226-100ma-80v-ultra-high-speed-switching-diodes-diodo-smt

https://www.mscnelectronics.com/upload/Produto12213.grande.71aef49d58c5126b7c1e49ac865f47b1.jpg

Therefore, I would look for an "XL" or "KL" part by Toshiba.

My advice is to try to view the circuit as functional blocks instead of testing each individual component.

For example, the previous circuit could be seen as the following:

https://handwiki.org/wiki/images/7/7f/Pushpull_%28English%29.png

All you would need to do to verify that circuit would be to vary the input to the op-amp above and below ground (by operating the appliance/device), and then observe the output at the junction of the two current sense resistors.

--- End quote ---
You are simply a genius. Based on your ideas, I have retrieved its true model. 2SK209-BL, I will carefully inspect its quality next! Thank you.

晓看风云:

My advice is to try to view the circuit as functional blocks instead of testing each individual component.

For example, the previous circuit could be seen as the following:

https://handwiki.org/wiki/images/7/7f/Pushpull_%28English%29.png

All you would need to do to verify that circuit would be to vary the input to the op-amp above and below ground (by operating the appliance/device), and then observe the output at the junction of the two current sense resistors.
[/quote]I cannot distinguish where the frequency comes from with my ability, so I can only search aimlessly. In fact, I found some useful things. The arrow above the figure points to the signal generated by the frequency from the muc, which is exactly the same as the frequency I set. I found the HC4053BF on the back of the line, and it finally went to its 10 legs, but there is only a 0/1 high and low level. I don't know what this means. After entering pin 10 of HC4053BF, the frequency never came out again

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