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| total novice needs advice on zener diodes |
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| emmajackt:
Hi, I am a total novice when it comes to circuit boards and was wondering if someone could help me. I have a Horizon Omega CS treadmill and there was a loud bang when I plugged it in last week and the circuit board had blown a couple of transistors and a couple of zener diodes. As the diodes have blown, I am unable to test what voltage ones I would need to replace them. I am attaching a picture of the same diode that i need and would be really grateful if someone could help me. I have looked online for a diagram of the circuit board with no luck Thank you, Kev. |
| FriedMule:
I am a novice like you so my advice can be the worst thing to do but I would try to locate if there are some place where it says the voltage and then work backward and if that do not work I'll put ZD in with a wary low voltage and then put one with a higher voltage until it looks to work fine. |
| capt bullshot:
If you just want to replace the diodes and transistors, you'll have to get some documentation or information from the manufacturer or a very similar unit. I don't have either of these. Otherwise, one would try to reverse parts of the schematic to get an idea of what is the purpose of these diodes, why they were blown and make an educated guess on their value. |
| mvs:
--- Quote from: emmajackt on December 02, 2018, 11:54:54 pm ---the circuit board had blown a couple of transistors and a couple of zener diodes --- End quote --- ZD1 is a Zener diode designator, but D12 is not. If it was also in glass DO-35 package, it might be 1N4148. If you make good photos of the board from both sides, perhaps we can derive components from their functions. |
| emmajackt:
Hi, thank you for your replies. I have attached a few more pictures of the whole board and a picture of the diodes that I need, from a picture I found online. The treadmill is quite old and not worth spending ££s on it. I really appreciate your answers. I thought it would be a case of replacing the two blown diodes, one blown resistor and the two transistors and hoping for the best, but obviously there's more involved and I cannot find a schematics for the treadmill anywhere. Regards, Kev |
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