Any of this user-replaceable?

Discussion in 'Electronics & Electrics' started by GetSmart, Jun 19, 2017.

  1. GetSmart

    GetSmart Member

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    I have a 8-port multicharger and only 2 ports are working.

    Is any of this user-replaceable to get it working again?

    [​IMG]
     
  2. dakiller

    dakiller (Oscillating & Impeding)

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    Pretty much the only part that will blow in there are the fuses, replace away.
     
  3. Satriani

    Satriani Member

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    assuming that those missing fuses is deliberate?

    Multimeter on diode test/beep test should do the trick, it looks rather simple.

    You should be able to test the diodes etc, and solder in new ones as required. (doubtful that they would fail but if they were to do so)
     
    Last edited: Jun 19, 2017
  4. merlin13

    merlin13 Member

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    Fuses there are easily replaceable. Depending what's it's actually being used to charge I'd also be pondering to fit slow-blow fuses, assuming they're not already being used of course

    Personally I'd also be very inclined to get someone with a multimeter and a serious knowledge of soldering/repair techniques to give it a once-over as well, because the solder joints on a lot of those high power resistors (those white rectangular things) look absolutely shite... if you get stuck on this I'm over here in Darra but I'm armpits 'n alligators this week.

    And depending how often you blow a fuse a slight ghetto mod of a suitable LED indicator setup across each fuse wouldn't be a bad idea to get someone to look at for you as well mebbe.
     
  5. GetSmart

    GetSmart Member

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    It's a commercial product ($370)...

    No idea about the previous fuses! I wouldn't assume anyone would have removed them on purpose, but who knows!

    Can anyone identify what fuses are required?


    They are charging Lego Mindstorm batteries.
     
  6. Life_Essence

    Life_Essence Member

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  7. Pugs

    Pugs Member

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    the fuses will have all the info you need on them.. pull one out and look...
     
  8. GetSmart

    GetSmart Member

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    Thanks guys! I'll give it a crack tomorrow... Much appreciated :)
     
  9. RobRoySyd

    RobRoySyd Member

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    Obviously the fuses are 500 milliamp, that's on the board. The precise size/type of the fuse is hard to determine without knowing the dimensions. Problem is there's at least two types with similar dimensions. as already said best to take one to Jaycar to be sure.

    I'd suggest buying a packet of 10 and replacing all the fuses even though it seems 2 are still OK. The lower current glass fuses do have a habit of failing for no good reason other than old age.

    I have to say for the cost of what's in that box it should have LEDs on each output so the user would know a fuse had blown/failed.
     
  10. Satriani

    Satriani Member

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    :eek:

    ouch! looks pretty basic for that cost!!

    Good luck hope you can get it fixed mate
     
  11. merlin13

    merlin13 Member

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    Faaaaark, talk about Charging What The Market Will Bear... :paranoid:

    Narr, can't be Lego-related - it's not made up of small interlocking blocks... :p
     
  12. Satriani

    Satriani Member

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    Anyone want to hazard a guess as to the value of the components in there? $10-12?
     
  13. RobRoySyd

    RobRoySyd Member

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    About $50 all up, those plastic cases and the 5W resistors are the highest cost components. The PCB may have cost a fair amount too and then there's the hand assembly. It all comes down to how many there's a market for and I suspect less than 100 globally, maybe less than 10.
     
  14. Stooge007

    Stooge007 Member

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    gotta factor in R&D costs and other overheads though
     
  15. merlin13

    merlin13 Member

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    Manufacture for international sales of a Name Brand product like that? Nup, in the quantities they'd be making it'd be well under $10, packaged in the retail boxes stacked on the pallets ready for shipping...

    Anything over that the purchasing officer should get fired.
     
  16. theSeekerr

    theSeekerr Member

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    It's not a big-brand product, though, it's a third-party accessory: http://www.teaching.com.au/product/WLMC01 or something very much like it.
     
  17. dakiller

    dakiller (Oscillating & Impeding)

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    Prices for making a batch of 100 units.

    Resistors 12c
    Diodes 10c
    Fuses 15c
    Fuse Holders 12c
    DC Jacks 35c

    $8.40 for pcb parts. Guessing these - $5 per PCB, $5 Case, $15 machining and assembly.
     
  18. merlin13

    merlin13 Member

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    Doing a build run out of China and push the quantities up for a decent production run (call it thousand or more units, setup costs wouldn't make it worth dicking about under that number...) it'd still be under $10 on the pallet, either with or without a Lego badge on it.

    And they're charging over $300 for that piece of shit to charge lithium ion batteries?? Bit of a worry where Uncle Google shows a Lego-badged one is just under $120.


    edit - Bit of another worry where an Oz dealer sells a 10 volt DC wall wart (with EU power pins in the picture) for $50
    http://www.mooreed.com.au/LEGOregEducationResources/BatteryCharger.aspx
     
    Last edited: Jun 21, 2017
  19. GetSmart

    GetSmart Member

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    Education boys... it's where the money is at!

    500MA M205 250V FUSE was the culprit.

    Muchly appreciated for everyone's help :thumbup:
     
  20. HSV_Enigma

    HSV_Enigma Member

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    What a rip, even uses a $6 Jaycar enclosure
     

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