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HELP : Nanao MS8-29FSG R571 Resistor (Purple)

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  • HELP : Nanao MS8-29FSG R571 Resistor (Purple)

    Hello,

    I need help with the R571 Resistor located in the flyback area of a Nanao MS8-29FSG chassis. It was replaced with the wrong one and can't find it what the original's value was. Mine is the one on the left with the green resistor. The one on the right has the original purple resistor. I tried to find the Nanao MS8-29FSG schematics online but no luck. Any help would be greatly appreciated.


    Thanks

    IMG_4085.jpg NkUDTT.jpg
    Caius on http://www.jammarcade.net

  • #2
    That looks like the heater resistor so if it was replaced it could be because they tried to match the chassis to a different tube (with different heater/filament specs) than the original one. So the stock resistor may not be correct for the current tube.

    Comment


    • #3
      I’ll have a look over the weekend...I’ve got a spare ms8-29fsg chassis in stock but [MENTION=204]Jomac[/MENTION] might beat me to it tonight.

      Comment


      • #4
        It's a 1.8 ohm 2W , just the current limit for the heater , the picture on an original tube with the current 3.3 ohm resistor would be very dark.

        Comment


        • #5
          Many thanks to you all for the precious help.I will refer this to my friend who has actually the monitor.Thanks again.

          P.S.
          My friend told me the image is actually very bright.He is currently checking if the tube is the original one.
          Last edited by caius; 7th July 2018, 04:13 AM.
          Caius on http://www.jammarcade.net

          Comment


          • #6
            My friend send me a picture of his tube, it seems it's the original one:

            tube.jpg

            Regarding the very bright image issue, he told me it could be due a missing connection to the remote control board.The same issue this thread refers to:

            https://forums.arcade-museum.com/showthread.php?t=68046

            It could be possible?
            Caius on http://www.jammarcade.net

            Comment


            • #7
              Originally posted by Jomac View Post
              It's a 1.8 ohm 2W , just the current limit for the heater , the picture on an original tube with the current 3.3 ohm resistor would be very dark.
              Hi,
              someone told me the R571 resistor is actually a 4.7 Ohm 2Watt one and not 1.8 Ohm :

              Snap4.jpg


              This is reported also on Daytona Twin manual at page 84 of this PDF:

              https://ia800806.us.archive.org/18/i...201%20USA1.pdf
              Caius on http://www.jammarcade.net

              Comment


              • #8
                Originally posted by caius View Post
                Hi,
                someone told me the R571 resistor is actually a 4.7 Ohm 2Watt one and not 1.8 Ohm :

                [ATTACH=CONFIG]132234[/ATTACH]


                This is reported also on Daytona Twin manual at page 84 of this PDF:

                https://ia800806.us.archive.org/18/i...201%20USA1.pdf
                Daytona was the time where many variations of these come through, there are quite a lot of differences between the parts list and what is on some of the 29FAN / FSG models , including some slightly different flybacks which might explain why some of these had an extra heater resistor soldered to the underside of the neck board, between 1.2 and 3.9 ohms , so might be best to check the heater voltage and make sure it doesn't exceed 6.3v , increase or decrease that resistor value to get it as close as possible.
                There is no reason the original should have been removed they don't burn out, this chassis may have had one of the modified neck boards on it or someone could have removed the resistor underneath it.

                Comment


                • #9
                  Ok, thanks.Is a FMR fusing resistor strictly needed in this case?The Daytona manual lists the R571 with this specs.
                  I found this one:

                  https://www.digikey.com/product-deta...0CT-ND/6691151

                  It also has the pulse withstanding feature that I'm not sure it's on in this case

                  And also:

                  https://www.ntepartsdirect.com/ENG/PRODUCT/F2W4D7
                  Caius on http://www.jammarcade.net

                  Comment


                  • #10
                    Originally posted by caius View Post
                    Ok, thanks.Is a FMR fusing resistor strictly needed in this case?The Daytona manual lists the R571 with this specs.
                    I found this one:

                    https://www.digikey.com/product-deta...0CT-ND/6691151

                    It also has the pulse withstanding feature that I'm not sure it's on in this case

                    And also:

                    https://www.ntepartsdirect.com/ENG/PRODUCT/F2W4D7
                    The digikey part is correct , pulse withstanding is basically the same meaning as slow blow is to a fuse, yes it needs to be fusible or you can burn out the heater winding in the flyback if something is wrong.

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                    • #11
                      Many thanks.
                      Caius on http://www.jammarcade.net

                      Comment


                      • #12
                        An update.After replacing the resistor with a a correct one , the image is much better but there is some geometry issue, I attach a picture.it seems a trapezoid issue, the bottom is a bit wider than the top. The only adjustments that I found on the board was SPC, V.Lin, Red, Green, Blue. The SPC makes the image wider or narrower in the middle but what I really need is a trapezoid adjustment.is there something I can do on this chassis?Thanks.
                        Attached Files
                        Caius on http://www.jammarcade.net

                        Comment


                        • #13
                          That's a pretty good picture from what I can tell. Some chassis do have a trapezoid adjustment, but I am not sure if this one does. Still, that image is not bad at all. I'd be pretty happy with that, unless it looks worse in person?

                          Comment


                          • #14
                            The trimmer on the vertical module near the remote board connector.

                            Comment


                            • #15
                              Originally posted by soyl View Post
                              The trimmer on the vertical module near the remote board connector.
                              Thanks, will check.
                              Caius on http://www.jammarcade.net

                              Comment

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