| Author |
Message |
Guest
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 Posted:
Sun Jan 02, 2005 8:31 pm Post subject:
? modem power supply mislabeled? |
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Something bugs me about my modem power supply: The back name plate of
the modem says it requires 9VDC 600mA, the transformer name plate reads
the same. However, according to my multimeter, the transformer is
putting out 12VDC.
Its a Zoom 56K dualmode model 2949L (L for Lucent).
The symtoms are: The modem often fails to initialize when I cycle the
power, and then Win 2K either fails to recognize it or I get flakey
connections.
Could the extra 4V cause my problems? Does the output of these wall
wart type transformers drift over time, or is it just mislabeled?
--zeb |
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Ken
Guest
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| Posted:
Mon Jan 03, 2005 12:15 am Post subject:
Re: ? modem power supply mislabeled? |
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zeb7k@hotmail.com wrote:
| Quote: | Something bugs me about my modem power supply: The back name plate of
the modem says it requires 9VDC 600mA, the transformer name plate reads
the same. However, according to my multimeter, the transformer is
putting out 12VDC.
Its a Zoom 56K dualmode model 2949L (L for Lucent).
The symtoms are: The modem often fails to initialize when I cycle the
power, and then Win 2K either fails to recognize it or I get flakey
connections.
Could the extra 4V cause my problems? Does the output of these wall
wart type transformers drift over time, or is it just mislabeled?
--zeb
|
Are you measuring the output of the PS under a load? If not, it is not
uncommon for the output to be significantly higher than the marked
value. Very unlikely that this is the cause of any problems you have,
since most modems will probably have a regulator that reduces the input
voltage. Not all, but most do. |
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Jeroni Paul
Guest
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| Posted:
Mon Jan 03, 2005 5:40 am Post subject:
Re: ? modem power supply mislabeled? |
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zeb7k@hotmail.com expuso:
| Quote: | Something bugs me about my modem power supply: The back name plate of
the modem says it requires 9VDC 600mA, the transformer name plate
reads the same. However, according to my multimeter, the transformer
is putting out 12VDC.
Its a Zoom 56K dualmode model 2949L (L for Lucent).
The symtoms are: The modem often fails to initialize when I cycle the
power, and then Win 2K either fails to recognize it or I get flakey
connections.
Could the extra 4V cause my problems? Does the output of these wall
wart type transformers drift over time, or is it just mislabeled?
--zeb
|
This is normal, the modem is designed for the supplied adapter.
Your modem may have a bad solder joint inside or be defective. Also make
sure the serial cable is properly plugged, no dust or oxidation in the
contacts, and try another one. |
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BillW50
Guest
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| Posted:
Sun Jan 16, 2005 4:03 am Post subject:
Re: ? modem power supply mislabeled? |
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I agree with the other replies. As virtually all transformer power
supplies will read 25% or more higher without a load. And the higher the
ma (or VA), the worse it will read unloaded.
Recycling an external modem back years ago was a good thing. But these
modern OS is holding the driver for any reason (TR line enabled), it
will be unrecognized or get flakey. A quick logoff of the current user
and relogging on again as the same Windows user will fix some of these
problems, but no guarantee.
Bill
<zeb7k@hotmail.com> wrote in message news:1104679885.321139.249060@z14g2000cwz.googlegroups.com...
Something bugs me about my modem power supply: The back name plate of
the modem says it requires 9VDC 600mA, the transformer name plate reads
the same. However, according to my multimeter, the transformer is
putting out 12VDC.
Its a Zoom 56K dualmode model 2949L (L for Lucent).
The symtoms are: The modem often fails to initialize when I cycle the
power, and then Win 2K either fails to recognize it or I get flakey
connections.
Could the extra 4V cause my problems? Does the output of these wall
wart type transformers drift over time, or is it just mislabeled?
--zeb |
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