Bubble Magus Dosser fix

Discussion in 'Equipment' started by xcaret, Dec 19, 2018.

  1. xcaret

    xcaret Supporting Member

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    So today I found my multimeter and opened the BM Dosser.
    Pump/motor #2 does not work but switching the port at the mainboard, the motor/pump works so it’s not the motor itself; tested for voltage at the three ports; pump 1 shows 11.5v when turned on; pump 2 shows 12.1v and pump 3 shows 11.5v
    Logic tells me if there’s voltage, by just plugging in the little motor, it should work but it does nothing.
    Any suggestions on what else to test? I checked the resistors’ ohms and they all read ok but with the caps, diodes and ic’s, not sure what or how to test on the meter.
    Any help/pointers, much appreciated.
     
  2. xcaret

    xcaret Supporting Member

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    Pics of logic board...

    20181219_211428_Film1.jpg

    20181219_211442_Film1.jpg
     
  3. Vhuang168

    Vhuang168 Supporting Member

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    The 2 working ports show 11.5V but the non-working port shows 12.1v? Maybe a short on that port upstream?
     
  4. xcaret

    xcaret Supporting Member

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    That's right, multimeter shows 12.1V for that motor's connector but does not start any of the other motors if I switch them manually on while plugged onto that particular port.
     
  5. xcaret

    xcaret Supporting Member

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    Testing an IC, I get some of the trminals to read OL open line; think this is the culprit
    IC PCF8583P
    Now to remove it and get a replacement.
     
  6. Coral reefer

    Coral reefer Past President

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    I have a couple non working if you need parts?
     
  7. xcaret

    xcaret Supporting Member

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    Yes please, called San Mateo electronics and they are not familiar with that particular IC

     
  8. Coral reefer

    Coral reefer Past President

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    I don't know what that part means. I did order a replacement main board from seaside aquatics once.
     
  9. xcaret

    xcaret Supporting Member

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    The booger with the numbers on, PCF8583

    20181220_122115_Film1.jpg
     
  10. Vhuang168

    Vhuang168 Supporting Member

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  11. xcaret

    xcaret Supporting Member

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    Yeah, I was reading on that; tested all three IC and this particular one might be the culprit; bigger IC's test fine.
     
  12. Vhuang168

    Vhuang168 Supporting Member

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    Check with Anchor Electronics in Santa Clara or Halted Electronics. They may have them.


    Sent from my iPhone using Tapatalk Pro
     
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  13. xcaret

    xcaret Supporting Member

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    Read a PDF from Phillips, seems this chip is also an event counter.
    next time I'm south, will check both places for the IC
     

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