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| Thread ID: 46715 | 2004-07-03 03:58:00 | Rackmount Switch Power Supply | Growly (6) | Press F1 |
| Post ID | Timestamp | Content | User | ||
| 249372 | 2004-07-03 03:58:00 | Hey there, Does anyone know where I can get diagrams for /replacement power supplies for a CNet CNSH-2400 24 port rackmount switch? The voltages are unstable and are causing the switch to reset over and over and over again really quickly - but otherwise its a perfectly good switch. Cheers (It's whetu's switch) |
Growly (6) | ||
| 249373 | 2004-07-03 06:31:00 | Heaps of dealers in New Zealand stock them, try giving some places like Ascent a call to get a price for a replacement. | whiskeytangofoxtrot (438) | ||
| 249374 | 2004-07-03 07:51:00 | > Does anyone know where I can get diagrams for > /replacement power supplies for a CNet CNSH-2400 24 > port rackmount switch? You would probably pay almost as much for a replacement power supply as you would for a replacement switch, that's allowing you could even buy a new PSU. The switch is not much over $300. If you wanted to invest a few dollars (possibly up to $100), you could ask a TV repair shop to look at the PSU, it is probably only a few caps that have died, or it could even be something simpler. However, you may find that the PSU is not intended to be serviced. Depending on how many voltage rails it has, you could also power it from an external supply. It is all a dodgy exercise both in terms of economics and network reliability so it may be better to replace the whole switch. Cheers Billy 8-{) |
Billy T (70) | ||
| 249375 | 2004-07-03 09:35:00 | I can afford to give it to you growly.. it's worth little more to me than a oversized paperweight... With a bit of time and effort I could fix it no problem, but I dont have time and I'm too tired for the effort part. You want to really know my dirty little secret? *cough* I got all three of those switches for 60 bucks from turners auctions *cough* so as the song goes: two outta three aint bad :D Open up the other one, it's the same revision by the looks, test the rails, map them out and see if there's anyway you could hax a standard off the shelf (or even PC) PSU to do the job |
whetu (237) | ||
| 249376 | 2004-07-03 11:03:00 | Heheheheheh well you see, I'm overly eager to get this to work, I've always wanted a 24 port... - even if it is a waste of time or money :D Ofcourse you could fix it whetu - but I don't seem to be able to know when things are worth my effort hehehehe... (cheers bro) As for the power supply - It has one 5V rail, shared into the three parts of the motherboard - totalling 1 amp, (I think, but it seems a bit much, that 1 amp does). That btw was the easy bit :s |
Growly (6) | ||
| 249377 | 2004-07-03 23:24:00 | A 5 volt 1 amp supply is a P of P to repair or replace. You might not end up with the same resistance to mains-borne electrical noise, but that is not likely to matter as I am sure your usage would not be mission-critical. If you don't have the skills yourself, any qualified electronics tech should be able to sort it in no time. A direct wire-in of an external supply would be even easier. I have a pile of 5 volt supplies (switching types as well as transformer bricks) lying around at current ratings up to 2.5 amps and they are not hard to find. Go look in second-hand shops etc. Cheers Billy 8-{) |
Billy T (70) | ||
| 249378 | 2004-07-04 05:31:00 | Thanks - I'm trying to get the manufacturer to send me a circuit diagram (pffft). Besides, how will I get the skills if I dont try? |
Growly (6) | ||
| 249379 | 2004-07-04 05:46:00 | I don't think that they will send you that information Growly, but you may be lucky. If you follow the mains cord into the switch, is the power supply in a separate box/enclosure or is it a component groupng in the corner of the PC board? If the power goes to a transformer then it is probably an analogue supply and that is reasonably easy to fix. If the power goes into a box with no sign of a transormer (or only a small ferrite cored example) then it is probably a switching supply and that will be hard to do much with except capacitor replacement and solder joint checks. Have a go, but remember the external power option if you can't get it working. Cheers Billy 8-{) |
Billy T (70) | ||
| 249380 | 2004-07-04 06:37:00 | Hey Billy T, I myself was very doubtful that would send it to me, but it was worth a shot. The power supply is a separate board with its own connectors etc - its not in its own enclosing though - but I'm positive it's analogue. It looks like a very common type, so for this reason that I thought I had a chance of replacing it or fixing it - so I'm glad you see what I mean :D I'm sure that DSE sells something along the same lines, infact I was looking for one but only found a variable voltage regulator that goes to like 6.5 V at its lowest :@ Other than that, the main part of the whole thing is perfectly fine - and the only problem with this power supply is that the voltages are unstable - grrrr!!!! |
Growly (6) | ||
| 249381 | 2004-07-04 06:56:00 | If analogue, it must have a 230 to 8-9 volt transformer to get the input volts down to a reasonable level. If there is a transformer, does it feed a bridge rectifier/three terminal regulator? If so, check the input voltage for stability (should be OK) then see if the variations happen on the output. For analogue supplies, DSE have Cat Z6555 LM7905CT -5 volt and Z6545 LM7805CT +5 volt regulators rated 1 amp. If there is no transformer then it is a switching supply, so aim for an external 5 volt supply, patched in. Cheers Billy 8-{) |
Billy T (70) | ||
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