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  1. #1
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    USB - connection a printer

    Is it possible for a printer to be run off a USB port on my computer.. without a power supply?! I understand that this might be possible, provided the printer is the first peripheral device added. I ask because I was given a Lexmark X5150 without a power supply.

  2. #2
    Super Moderator jscher2000's Avatar
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    Re: USB - connection a printer

    Most printers draw quite a bit of power... a "traveling" printer designed to accompany a notebook perhaps could be powered off the USB cable, but it would have to be designed for that. The X5150 manual does not seem to mention the possibility of not using the Lexmark power supply. I'm not sure whether you can match the specifications with a "universal" replacement, or whether you need to go back to the source.

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    Re: USB - connection a printer

    I can't see how the printer (and it's a multifunction device with lots of requirements for power) could work, since it is designed, I presume, to take 110 V 60 Hz power and uses a current of a few amps. What it gets transformed to, heaven knows! But it isn't what you get out of a USB socket.

    If it actually DOES work, surely it would be cheaper to buy a new power supply cord/transformer up front than to replace your motherboard/USB card if too much power gets taken! <img src=/S/bouncenburn.gif border=0 alt=bouncenburn width=31 height=31>
    <font face="Script MT Bold"><font color=blue><big><big>John</big></big></font color=blue></font face=script>

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  4. #4
    Uranium Lounger viking33's Avatar
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    Re: USB - connection a printer

    Andrew,

    Add my agreement to Jefferson & John's comments.
    Most USB ports are capable of only supplying 1/2 amp of DC current. Far less than a printer will require.
    To get universal power "brick" to use, you would need the following information:
    Input-AC or DC at what voltage? and what frequency? US freq is 60 hertz, Euro ( most ) 50 hertz
    Output voltage?
    Output current, how many amps?
    What type of connector for the printer input.
    Polarity of the voltage. Positive or negative at the tip?
    If you can't match ALL of those specs, DON'T USE IT.

    Bet bet is to try Lexmark for a replacement. I don't think you will be lucky to find something else to match. ALL power bricks are NOT the same.
    BOB
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  5. #5
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    Re: USB - connection a printer

    Sorry but there's no way you are going to "power" a printer over USB - the smallest (in terms of power requirements) printer I found consumes 15 watts of power that it draws from 4 AA batteries - or optional plug in transformer that I still bet weighs less than all the AA batteries you have to lug around because 4 AAs aren't going to last long!

    And USB only supplies 4.75 to 5.25VDC - I looked at several Lexmarks and they run on 30V.

    All the USB is going to do for you is provide signal to the printer - You still need a separate power supply to print.
    Bill (AFE7Ret)
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  6. #6
    Uranium Lounger viking33's Avatar
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    Re: USB - connection a printer

    Bill,
    I agree with your points completely, but at the risk of being "picky", you should post your reply to the person who originated the thread so that they can get the email notification of a reply, not me. <img src=/S/cheers.gif border=0 alt=cheers width=30 height=16>
    BOB
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    Long ago, there was a time when men cursed and beat on the ground with sticks. It was called witchcraft.
    Today it is called golf!

  7. #7
    4 Star Lounger
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    Re: USB - connection a printer

    You know, sometimes its embarrassing to have a last name like mine! But actually, I thought any respnse to the tread triggered an email - guess that is only if you originated it.

    Thanks (and picky is my middle name).
    Bill (AFE7Ret)
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    Heat is the bane of all electronics!

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  8. #8
    Plutonium Lounger Leif's Avatar
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    Re: USB - connection a printer

    You only get an email if a post is made that is a reply to yours *and* you have opted to receive notifications. It makes no difference whether or not you originated the thread.

  9. #9
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    Re: USB - connection a printer

    And that makes sense - just need to pay more attention who I am repling to.
    Bill (AFE7Ret)
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    Heat is the bane of all electronics!

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  10. #10
    Uranium Lounger viking33's Avatar
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    Re: USB - connection a printer

    Bill,
    Well I just didn't state it correctly. I was half right. Something like being half fast? <img src=/S/groan.gif border=0 alt=groan width=16 height=15> <img src=/S/newbrain.gif border=0 alt=newbrain width=21 height=22>
    BOB
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    Long ago, there was a time when men cursed and beat on the ground with sticks. It was called witchcraft.
    Today it is called golf!

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