Cheap cash register with a dead transformer

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  • Toasty
    Badcaps Legend
    • Jul 2007
    • 4171

    #21
    Re: Cheap cash register with a dead transformer

    I understood that. Realize they won't run the reg, but battery backup in a sub-$100 register is just surprising. I've seen ones that cost $1,000 not have that.
    veritas odium parit

    Comment

    • dood
      Deputy dood
      • Mar 2004
      • 2462
      • USA

      #22
      Re: Cheap cash register with a dead transformer

      Interesting.. I'm not familiar with registers at all. Didn't know that battery backup was that unusual.
      Ludicrous gibs!

      Comment

      • Toasty
        Badcaps Legend
        • Jul 2007
        • 4171

        #23
        Re: Cheap cash register with a dead transformer

        It's not that it is unusual. The fact it is in such a low priced unit I found unusual.

        Get it fixed yet?
        veritas odium parit

        Comment

        • dood
          Deputy dood
          • Mar 2004
          • 2462
          • USA

          #24
          Re: Cheap cash register with a dead transformer

          Originally posted by Toasty
          It's not that it is unusual. The fact it is in such a low priced unit I found unusual.

          Get it fixed yet?
          Yep, swapped the xformer out of one of the other registers, and all is well.

          One down, two more to go!
          Ludicrous gibs!

          Comment

          • Toasty
            Badcaps Legend
            • Jul 2007
            • 4171

            #25
            Re: Cheap cash register with a dead transformer

            R U DUN? It's THURSDAY!!!

            veritas odium parit

            Comment

            • dood
              Deputy dood
              • Mar 2004
              • 2462
              • USA

              #26
              Re: Cheap cash register with a dead transformer

              Got the 2nd working... Actually ended up using the internals of the one I stole the xformer from. I really wish he just would've given me all of them at the same time... The 3rd one I got had dead keys, but even after I cleaned the circuits off, it was acting weird. All the keys responded normally, but it would freak out and blink the screen and run the receipt printer at random times. I took the keypad and transformer off of it, and transplanted into the other, which just had a few dead keys. So, he got 2 working registers back, and is happy

              He has a 4th register, so I hope to be able to make that one work too, but it's not the same model as the others.
              Ludicrous gibs!

              Comment

              • Toasty
                Badcaps Legend
                • Jul 2007
                • 4171

                #27
                Re: Cheap cash register with a dead transformer

                The freak out could be too much ripple on the line which the CPU beats with its own freq.

                -or-

                There's a margarita under the keyboard. Literally.

                Check those ribbon cables when you can. A little corrosion where it plugs in to power/logic board, or under one of the chips.

                Good job! Hope you were well compensated for the ER work.

                Toast
                veritas odium parit

                Comment

                • riotpack
                  Member
                  • Jul 2008
                  • 27

                  #28
                  Re: Cheap cash register with a dead transformer

                  Look at the V regulator on that heatsink and see what type it is 7805 etc. Look at the electrolytic capacitor voltage after the bridge rectifier and you should get a rough idea what the transformer voltage was. Say the Electros are 16V then you could assume the transformer would be 9VAC (9*1.414=12.726V DC) and not 12VAC as that would be greater than 16VDC. As for current, well the peak of course would be when that motor kicks in and from what I see and from the existing Xformer would be less than 1A peak.
                  Thats not a Fuhjyyu I used in your antec PSU its a HITACHI!! rofl lol lmao funni gui!

                  Comment

                  • dood
                    Deputy dood
                    • Mar 2004
                    • 2462
                    • USA

                    #29
                    Re: Cheap cash register with a dead transformer

                    The one that was freaking out had been thoroughly doused with beer. The keyboards clean up easily with some water and alcohol (ironic), but I think the mainboard took a hit. Or at least shorted when the beer was applied, and messed something up. I couldn't see any physical damage to the mainboard, and I wasn't looking to put too much time into these by tracing circuits, etc.

                    I was compensated in the form of a few tasty craft brews...
                    Ludicrous gibs!

                    Comment

                    • riotpack
                      Member
                      • Jul 2008
                      • 27

                      #30
                      Re: Cheap cash register with a dead transformer

                      I have seen liquids hide under ICs and remain conductive causing problems, sounds like noise getting into the logic(cpu) side of things and the high Z sections (like the Xtal) can easily be influenced by even high resistances. It doesn't have IC sockets does it? regardless it may be good to get some parts from
                      Thats not a Fuhjyyu I used in your antec PSU its a HITACHI!! rofl lol lmao funni gui!

                      Comment

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