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looking for a suitable transformer

Discussion in 'Troubleshooting and Repair' started by fosgate3, May 6, 2017.

  1. fosgate3

    fosgate3

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    Mar 15, 2011
    Hi everyone. So I have a Craftsman multi-battery charger for tools, model# 315.CH2000. It worked really well for my dad and he passed it (and all the 19.2v tools that he had) to me when he upgraded his drill. I plugged it in to charge up the batteries and it made a loud popping noise every minute or so, then smoke came out of one end. I took it apart and I can see where the transformer appears to have overheated (see pic). I cannot find anything else that looks to be damaged on either side of the board (there is only one IC and a few mosfets on the backside of the board) so I wanted to see if I could replace the transformer before forking out $70-$90 on a new multi-charger. The problem that I am running into is finding a suitable transformer. I searched for the number on the transformer, "BCK2800-1328", but found very little and I don't really know a lot about transformers to know what to look for. So, I was hoping someone here would have some resources they could use to point me in the right direction.

    I know I can buy another charger. I would like to try my hand at fixing this one unless the cost of a transformer exceeds the cost of a charger. Thanks in advance!
     

    Attached Files:

  2. davenn

    davenn Moderator

    13,260
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    Sep 5, 2009
    please show a photo of the whole board and a photo of the under side of the board

    Will state now, the probability of getting a replacement transformer will be very low
    if the charger manufacturer cant or wont supply it, you will be out of luck as the transformer will have been made specifically for them
     
  3. 73's de Edd

    73's de Edd

    2,677
    1,085
    Aug 21, 2015
    Sir fosgate . . . the Third . . .

    Meaning that this is being a Ni Mh type battery charger . . . . while dear ‘ole dad got the Li Ion family on his new unit.

    My choice also, as my NiMh’s get depleted by inherent internal leakage within 3 mos, while I have had multitudes of Li Ion units at 50% of their peak current capacity after 1 year of storage.

    That PCB seems to be really tropicalized . . .what with its heavy over coating of clear lacquer/varnish/poly /epoxy coating .

    Soooooo . . . . . it just might require sharpened needle points on your meter probes to pierce it.

    Does the transformer now fully meet the nose touching s n i f f f f f test ? of being a bad transformer ?

    It was probably knocked out by a shorted diode full wave bridge, such as I think that I can see just barely showing only two of its terminals at the bottom photos top left corner.

    Can you do a diode test of it with your DVM, being used in its diode test mode.

    Also give us the DC voltage rating on the canned main blue storage electrolytics.

    Any wattage or voltage ratings marked on the unit. Its UL markers code identifier.

    Is this the unit / model which holds just ONE battery or is it the model that holds several batts (4? I think).

    On the forthcoming photos . . . full frame fitting photos . . . all squared up . . . . and avoiding the objectionable light reflection of the prior top photo.



    73’s de Edd
     
  4. fosgate3

    fosgate3

    9
    0
    Mar 15, 2011
    Here are the other pictures. I hope they are suitable. Let me know if they aren't.
     

    Attached Files:

  5. 73's de Edd

    73's de Edd

    2,677
    1,085
    Aug 21, 2015
    Sir fosgate3



    Looks like your unit IS being the large multi battery capacity unit

    After seeing your complete unit, I don’t think that there is going to be a transformer involved.

    I do think that your BAMMMMM-BANGEN-FLASHEN is being related to my YELLOW oval circled component.

    It can account for the above as well as emanating its own distinct odor.

    Examine the adjunct peripheral edges of the device , and THEN, examine the very top tip where it appears that flashover and arcing has occurred with a resultant residue of grey ash.
    Probe it with a pin to confirm, whereupon, some of its ash should crumble apart easily.

    Pass us its assigned identifier silk screened on the PCB beside it . . .as our view is currently blocked of that info.
    Also any cryptic alpha-numeric info that ? MIGHT ? be printed upon the unit.

    Look at the RED oval designated wired in fuse and confirm that its link is NOT open and probably is still being the factory original.

    MAGGED PHOTO REFERENCING :

    Magged Photo Referencing.jpg






    73’s de Edd
     
  6. davenn

    davenn Moderator

    13,260
    1,748
    Sep 5, 2009
    there is a switching transformer, Edd .... didn't you see the first post
    which clearly showed that the transformer had expelled smoke


    @forsgate3 .... now seeing that is the switching transformer that failed ( rather than being a mains transformer)
    getting a replacement is even more unlikely

    you can check the things Edd has suggested ... the mains input fuse and the PTC ... the PTC does look ok, no signs of failure
    The fuse may be blown, but that isn't where the main problem is



    Dave
     
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