| Electronics > Repair |
| Help me repair the PC Power Supply |
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| toli:
The PS is a Tagan (480W if I remember correctly) - I will check the model later, it's not in front of me at the moment. The fuse burnt, I open it up, and see a couple of low voltage cap + one of the 200V caps with the lead slightly bent. I assumed they were all fried. Took them out of the circuit, measured them (with both the DMM, and by putting a voltage on them) and they work fine. Kept on searching, found 2 transistors (2SC3320) which are shorted. Next to them is a PFF6N60 which has a diode between two pins, and an open circuit to the 3rd pin. So the questions at the moment are: 1 - Is there anything else I should check? The rectifier is mounted on a small PCB next to it and it check fine. 2 - What replacement transistors would you recommend for the 2SC3320? 3 - I could not find the datasheet for the PFF6N60. I found some data sheet with the same part number but it isn't the same part. This one is in a TO-220 package, and the one I found is actually for some sort of DO-XX package. Can someone tell me what this part is, and what commonly available part I can use in its place? Thank you. |
| amyk:
1. Check for bulging caps and burnt resistors. 2. 2SC3320 3. http://www.chinaeds.com/zl/201012112032415509_PFD2500PDF.pdf Made by what seems to be now-defunct Pyramis. It's an N-channel 600V 6.2A MOSFET with 1R2 Rds. Replace with any other 6N60 MOSFET. |
| toli:
Thank you for the reply. 1. Did that, could not find anything so far. 2. I can't get it locally, and since at the moment my little brother has no PC to spend his time I must fix it ASAP or my head will explode :) Are there any similar devices you can recommend? I can simply look for something with similar spec's but if there's any recommendations it would be best. 3. Thank you very much for that, I couldn't find that one. If that's the case then this one is fine (the D/S have a diode between them, and the gate is disconnected from both so seems it's still alive). |
| Rerouter:
its gain is between 10 and 30, its a power transistor, rated for 400V, CE perhaps http://au.element14.com/nte-electronics/nte2333/bipolar-transistor-npn-450v-to/dp/1383712 |
| Unclegummers:
Sounds like an waste of time? Aren't computer supplies cheap nowadays? I'll retract my first statement if you learn lots 8) Post pics, more measurements. |
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