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sad device - no support - no fix

Discussion in 'Troubleshooting and Repair' started by tedstruk, Aug 6, 2017.

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  1. tedstruk

    tedstruk

    475
    7
    Jan 7, 2012
    A gift to me... A USB "versa drive" external hard drive. This device roars up to abut 7200rpm(I think its a 5400 device) with a whirring buzz that shakes the earth foundations in the desk....
    Then it just is a do nothing app, and no drive appears in the drive list, and the entire thing was a waste of money time and effort to save store and keep your precious files...(kind of funny... but fairly expensive so don't laugh yet!)
    tinker tinker and more tinker! (did I say thinker?)
    installed the drive in a PC, works like a brand new drive... I wonder why?
    and the board in the "VD" is small 1" x 3.5" has a meriad of great components...
    mini fan
    IDE buss
    short power adapter - small factor to large factor
    DC adapter port
    mini power switch

    onboard I found an induction coil on a toadstool that has a busted toadstill cap.... that is the top of the induction coil is missing about 1/3 of the top... broke off.

    It has "220" written on the top of it. I wonder if this could be the problem ie. why the thing didn't work?
    so much for valuable components!!! a little coil of expensive wire wrapped around a cheap core spool... IMG_20170806_110555799.jpg
     
  2. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    As a stand-alone device the HDD interface takes either a DC input and will be required to 'develop' its own 5V and 12V supplies.

    The coil (broken) will be part of the SMPS conversion to generate this missing supply and the broken ferrite former will be affecting the conversion process.

    The '220' notification will refer to its value of 22μH and any suitable replacement will restore the supply and fix the drive operation. Just make sure the replacement inductor has the same thickness wiring wound - looks to be good for a couple of amps to me.
     
  3. tedstruk

    tedstruk

    475
    7
    Jan 7, 2012
    K. the coil sits on the opposite side, SMD, to a DC-DC buck converter chip..
    http://www.alldatasheet.com/datasheet-pdf/pdf/87873/ANACHIP/AP1507-50D5.html
    I wonder if the induction changed the operation of the chip and caused it to fail? I know IMG_20170806_112126723.jpg that if I get my finger close to an EPROM that it goes all on... I think that coil carries alot more juice than my finger... maybe a repositioning is in order?
     
  4. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
  5. tedstruk

    tedstruk

    475
    7
    Jan 7, 2012
    How about a thinner wire .03mh inductor piggy back style on the busted toadstool?
    looks neat! IMG_20170806_120502899.jpg
     
  6. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    0.03mH = 30μH and still 50% off what the circuit is designed to use. Also you cannot 'parallel' them - if you stack 'em you must electrically disconnect the duff one.

    Have you tested to see if the 12V and 5V lines are correct?
     
  7. tedstruk

    tedstruk

    475
    7
    Jan 7, 2012
    I was using a 12v supply I made out of a spare I had in the shop. I didn't check any voltages, and when I found the busted coil, I just pulled the drive and stuck it in a PC to see if it worked, I suppose I should change the coil, reinstall a drive put it back together and test it again... but they are obsolete, I can't even get a power supply for it.
    It has a lot of nice components for my collection though... better keep it for later!
     
  8. tedstruk

    tedstruk

    475
    7
    Jan 7, 2012
    I pulled 3 wraps from the .03mH and got .02mh how about that?
     
  9. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    Should be ok- try it.
     
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