Need Help with BK Precision 2120 Scope

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  • ec2356
    New Member
    • Jun 2011
    • 2

    #1

    Need Help with BK Precision 2120 Scope

    Trace is being snapped back to Center of Scope on Y Axis. I can get a lock on the signal but my trace is distorted. Scope was in storage for 2 years. Am willing to try just about anything at this point.
    Attached Files
  • Longbow
    Badcaps Veteran
    • Jun 2011
    • 623
    • USA

    #2
    Re: Need Help with BK Precision 2120 Scope

    That's an interesting trace. Can you see the retrace lines like it shows in the photo? Could you post a couple of different waveforms? What does it look like with no input? Is that vertical line in the center a second channel?
    Is it plugged in?

    Comment

    • Toasty
      Badcaps Legend
      • Jul 2007
      • 4171

      #3
      Re: Need Help with BK Precision 2120 Scope

      Make sure all switches are cycled and set to their "default" positions.

      Where's the 2nd trace? What do you get when you probe the calibration signal with each channel?

      Open the cabinet with power disconnected and insure all board connectors and their like are properly seated.

      Also check any socketed devices such as IC's.

      Fair Warning: Don't screw with -any- internal adjustments. They're -not- what happened from being stored.
      Attached Files
      Last edited by Toasty; 07-01-2011, 09:43 AM.
      veritas odium parit

      Comment

      • Toasty
        Badcaps Legend
        • Jul 2007
        • 4171

        #4
        Re: Need Help with BK Precision 2120 Scope

        Any luck???

        veritas odium parit

        Comment

        • dadamnman
          New Member
          • Oct 2013
          • 2
          • United States

          #5
          Re: Need Help with BK Precision 2120 Scope

          I have a B k precision 2120 the problem is the the trace doesn't rotate,PLEASE HELP any info is greatly appreciated.....thanks

          Comment

          • budm
            Badcaps Legend
            • Feb 2010
            • 40746
            • USA

            #6
            Re: Need Help with BK Precision 2120 Scope

            @dadamnman, check and see if the DC voltage to the trace rotation coil is changing (in both polarities) when you rotate the pot, see page 9 of the service manual., it is just a DC magnet coil fed by -12vdc, +24vdc.
            Never stop learning
            Basic LCD TV and Monitor troubleshooting guides.
            http://www.badcaps.net/forum/showthr...956#post305956

            Voltage Regulator (LDO) testing:
            http://www.badcaps.net/forum/showthr...999#post300999

            Inverter testing using old CFL:
            http://www.badcaps.net/forum/showthr...er+testing+cfl

            Tear down pictures : Hit the ">" Show Albums and stories" on the left side
            http://s807.photobucket.com/user/budm/library/

            TV Factory reset codes listing:
            http://www.badcaps.net/forum/showthread.php?t=24809

            Comment

            • dadamnman
              New Member
              • Oct 2013
              • 2
              • United States

              #7
              Re: Need Help with BK Precision 2120 Scope

              hey man thank you SO MUCH for the help!will do and thanks for the links,if I have some more questions will you kinda pop in every now and again?and is there a thumbs up button cause you need a double thumbs up for that.

              Comment

              • cjespers
                New Member
                • Feb 2014
                • 2
                • USA

                #8
                Re: Need Help with BK Precision 2120 Scope

                Hello All!!
                Got one of these (2120A scope) that's is burning resistor 911. (no pun intended)

                Any ideas what to check?

                Thanks so much for your advice!!

                Comment

                • budm
                  Badcaps Legend
                  • Feb 2010
                  • 40746
                  • USA

                  #9
                  Re: Need Help with BK Precision 2120 Scope

                  @cjespers: Did you download the service manual? Where is this resistor located at? Pictures? I do not see R911 on the parts list.
                  Last edited by budm; 02-23-2014, 09:06 PM.
                  Never stop learning
                  Basic LCD TV and Monitor troubleshooting guides.
                  http://www.badcaps.net/forum/showthr...956#post305956

                  Voltage Regulator (LDO) testing:
                  http://www.badcaps.net/forum/showthr...999#post300999

                  Inverter testing using old CFL:
                  http://www.badcaps.net/forum/showthr...er+testing+cfl

                  Tear down pictures : Hit the ">" Show Albums and stories" on the left side
                  http://s807.photobucket.com/user/budm/library/

                  TV Factory reset codes listing:
                  http://www.badcaps.net/forum/showthread.php?t=24809

                  Comment

                  • pneumaticdril
                    Member
                    • Jun 2015
                    • 11
                    • USA

                    #10
                    Re: Need Help with BK Precision 2120 Scope

                    hello anybody! I just joined site and cannot post new thread. I also have a BK 2120 I just got. It has no horizontal sweep. It only displays a dot in center on display that moves about 1/4 inch from left to right. Any ideas? Thanks!

                    Comment

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