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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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3COM 3C857 - PSU
Today's visit to the dump turned up a 3COM 3C857 DSL gateway, needless to
say I didn't get the matching wall wart, stamped on the back is 10 - 30VDC. That seems to be an unrealistically wide range, especially when I downloaded the user manual and saw the dire warnings to only use the correct power unit! Anyone know what gives, such as can I get away with a PSU that just tops 10V? Also anyone know what I'm missing - not having the original install CD? TIA. |
#2
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3COM 3C857 - PSU
"ian field" wrote in message ... Today's visit to the dump turned up a 3COM 3C857 DSL gateway, needless to say I didn't get the matching wall wart, stamped on the back is 10 - 30VDC. That seems to be an unrealistically wide range, especially when I downloaded the user manual and saw the dire warnings to only use the correct power unit! Anyone know what gives, such as can I get away with a PSU that just tops 10V? Get a multi voltage wall wart and step the output up until it works. If you want to get fancy, see if it has a regulator inside and crank it up until the voltage seems correct. |
#3
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3COM 3C857 - PSU
"Homer J Simpson" wrote in message news:kNwZg.19934$P7.9791@edtnps90... "ian field" wrote in message ... Today's visit to the dump turned up a 3COM 3C857 DSL gateway, needless to say I didn't get the matching wall wart, stamped on the back is 10 - 30VDC. That seems to be an unrealistically wide range, especially when I downloaded the user manual and saw the dire warnings to only use the correct power unit! Anyone know what gives, such as can I get away with a PSU that just tops 10V? Get a multi voltage wall wart and step the output up until it works. If you want to get fancy, see if it has a regulator inside and crank it up until the voltage seems correct. Thanks - good idea! It has a switcher with a small-ish toroid, a 7-pin SMT TO220 and a 3A SB rectifier, so 10 - 30V probably isn't that unrealistic after all. |
#4
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3COM 3C857 - PSU
ian field wrote:
Today's visit to the dump turned up a 3COM 3C857 DSL gateway, needless to say I didn't get the matching wall wart, stamped on the back is 10 - 30VDC. That seems to be an unrealistically wide range, especially when I downloaded the user manual and saw the dire warnings to only use the correct power unit! Anyone know what gives, such as can I get away with a PSU that just tops 10V? Also anyone know what I'm missing - not having the original install CD? TIA. I was given three HP Jetdirect 300X Ethernet to Centronics printer interfaces that are marked 9 to 35 VDC, and they had 13 VDC power supplies with them. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
#5
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3COM 3C857 - PSU
"Michael A. Terrell" wrote in message ... ian field wrote: Today's visit to the dump turned up a 3COM 3C857 DSL gateway, needless to say I didn't get the matching wall wart, stamped on the back is 10 - 30VDC. That seems to be an unrealistically wide range, especially when I downloaded the user manual and saw the dire warnings to only use the correct power unit! Anyone know what gives, such as can I get away with a PSU that just tops 10V? Also anyone know what I'm missing - not having the original install CD? TIA. I was given three HP Jetdirect 300X Ethernet to Centronics printer interfaces that are marked 9 to 35 VDC, and they had 13 VDC power supplies with them. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida That sounds about the right ball-park, I'll search my tea chest of spare wall warts for one marked 10V and pushes 12 - 13V off load. If anyone can tell me, I'd still be interested to know what would be on the original install CD if I had it - the driver I downloaded was less than 1Mb. |
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