Electronics > Repair
Help identify glass encapsulated diodes
晓看风云:
I have a circuit board from Japan produced in 1999, which has two glass encapsulated diodes with silk screen printing of QY10 or QY1O. I didn't understand the alphabetical order of the silk screen printing. The silk screen on the circuit board is labeled as D10 and D11. The multimeter diode cannot conduct in the forward direction when measured in gear, and there is a 0.598V voltage drop in the reverse direction. Both are the same. I need help identifying what kind of diodes they are, whether they are damaged or what I should replace them with. I checked their wiring connections, and one of them provides positive power to lt1007, while the other provides negative power. Once again, I earnestly request everyone's help!
fzabkar:
10V Zener?
晓看风云:
--- Quote from: fzabkar on August 24, 2024, 06:39:40 pm ---10V Zener?
--- End quote ---
I don't know, but the silk screen printing on the board is D instead of ZD. I don't know if there will be any difference in the silk screen printing of circuit boards in Japan in 1999. Additionally, one of these two diodes will consistently output -8V steadily. When switching gears, it will change from+8V to+15V. I don't know if this phenomenon is normal. I really want to figure out what type of diode this is now!
fzabkar:
Can you trace the circuit in that area? That will provide a clue. The diodes seem to be behaving as if they are open circuit. The voltage drop in the reverse direction could be due to the associated pass transistor. (?)
晓看风云:
--- Quote from: fzabkar on August 24, 2024, 08:38:33 pm ---Can you trace the circuit in that area? That will provide a clue. The diodes seem to be behaving as if they are open circuit. The voltage drop in the reverse direction could be due to the associated pass transistor. (?)
--- End quote ---
Okay, I will try to draw a simple circuit diagram about diodes to help better identify them. Thank you very much for your help. I will inform you as soon as there is any progress!
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