Question about 3Com U.S. Robotics Faxmodem 56K

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Power supply for 3Com U.S. Robotics fax modem.

I'm setting up a used computer for my daughter. It has everything, except the power supply for the modem. I have several power supplies, but I'm not sure what the output should be. Can you help, please?

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  • Anonymous Mar 26, 2014

    hello
    my 3com U.S. Robotics modem dosent work after failed firmeware update. No command worked.
    I make a reset on the AMD firmeware chip. now when i type "AT" and press enter, the anser comes "Boot>". How can i reflash it ? Please help

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You need 9V/1A supply (with +9V at center pin) for your model with beige case. Do not use 22V/1.5A supply for old 33.6k model with
gray case. The shapes of the cases are very similar (56k has fever
leds, no external volume control, and no connectors for external
telephone equipment and external speaker), but the power supply
voltages and currents are completely different.
I hope this will help.

Posted on Feb 11, 2009

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Posted on Jan 02, 2017

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