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Strange noice in Roland TD-10

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  • Strange noice in Roland TD-10

    Hello,

    I am working with Roland Percussion Sound Modul TD-10 repair and have got some problem . Can you help me with some advice ?

    This is the problem's description :

    Unit: Roland Percussion Sound Modul
    Model: TD-10

    Main defect : Noise is going at "Phones" and "Master" outputs in any mode , except test mode . Instaed of the music in DEMO mode , we can hear the noise only , so far from real music .

    Results of the internal tests : All tests seems good and report "OK" , except the following ones :

    - Test 3 Expansion Board
    Wave Exp. Test

    Senso R/W NG
    ERR ERR

    (possible reason : no wave expansion card prerents at a slot )

    - Test 4 ESP

    ESP ERROR

    PR IR DR GM SO
    XP - - - NG -
    ESP1 OK OK OK OK -
    ESP2 OK OK OK OK -
    ESP3 OK OK - OK -

    - Test 7 Switch and LED

    There is not [PREVIEW] button's velocity measuring done ! The reaction on this button pressing presents , but the velocity value lefts 12 and has no changes , so the test stops on this point and it is s impossible to finish it .

    - Test 10 A/D

    There is no reaction to FADER potenciometer's moving .

    Additional remarks :

    - after any key pressed , the LED "Trigger" begins to light randomly , but sinchronicaly with the noise .

    - the noise is generated by DAC chip IC55 , and there is silence on the output of DAC IC51 .

    - there is a strange meandr signal presents on a diagram of XRD signal

    - signals CD3, CD10, CD13 are very strange and have have much differences from other CDx lines .

    What I have made :

    - swaped DAC IC51 with DAC IC55 - with no result , so possible the noise is generated by XP_3 and go thru ESP_2 chips to the DAC IC55 .

    - replace IC27 XP_3 - with no result .

    - checked signals on CPU IC28 , all signals seems normal , except XRD, CD3,CD10,CD3 .

    - in working mode , cuted XRESET line from IC32 ECXITON and connected it to the ground - the noise left the same .


    Possible reasons :

    - CPU has some trouble in interrupts processing

    - EXCITON doesn't let the MCU to process interrupts correctly .


    What can you advise me to check more ?

    I would be very thankful to you for any advices and possible collaboration .

    Please replay to [email protected] .

    Thank you .

  • #2
    Hi Aleksandr,

    in response to your mail and post here, I have to admit that this one is way above my head. The only thing I can come up with (and I think you already figured this out yourself) is that the expansion board is busted (yeah, duh, I know)

    The rest I leave to the experts.

    Sorry I couldn't be of more help.

    Once you figure it out, let us know where the problem was located, although I doubt I will ever have to switch DAC ICs around.
    My equipment:
    :: (Expanded, TDW-1 with V-Cymbal Control)
    :: 2x CY-15R, 1x CY12H, 2 CY12R/C
    :: 1x Pad-120, 8x Pad-80R, 6x PD-7, 1x PD-9, 1x KD-120
    :: 1x FD-7
    :: 1x Roland MDS-10, 6x Sonor Delite double cymbal stands
    :: 1x DW 5000 Pedal
    :: 1x Mackie 1202 VLZ
    :: 1x NAD C521 CD-Player

    To be expanded soon ...

    Comment


    • #3
      Feefer, down! You're positively rabid again today.

      LoL.
      My equipment:
      :: (Expanded, TDW-1 with V-Cymbal Control)
      :: 2x CY-15R, 1x CY12H, 2 CY12R/C
      :: 1x Pad-120, 8x Pad-80R, 6x PD-7, 1x PD-9, 1x KD-120
      :: 1x FD-7
      :: 1x Roland MDS-10, 6x Sonor Delite double cymbal stands
      :: 1x DW 5000 Pedal
      :: 1x Mackie 1202 VLZ
      :: 1x NAD C521 CD-Player

      To be expanded soon ...

      Comment


      • #4
        lol!
        -Drumlogic, V-session, Visulite/roland cymbals, (2)Mackie srm-450's, bbe 482 sonic maximizer,

        Comment


        • #5
          Hmmm?

          Scratch, scratch...

          Output IC has bad ground?

          NOR gate gone in the MCU.

          Scratch, scratch...

          Yep, could be the fuel pump. I'll give ya fifty bucks for it.

          LOL
          Kelly Mercer
          Halifax, Nova Scotia
          Canada

          My Youtube Channel!
          http://www.youtube.com/user/VirtualMP3Studio

          My "home studio" webcam!
          http://virtualmp3studio.ww.com/

          Comment


          • #6
            I'll bet you it's the darn fetser valve.

            Comment


            • #7
              Originally posted by c. jude:
              (BTW, if you don't find one like that reasonably, alternatively a PM-16 can be had cheap and does a decent job (even has some rudimentary layering and proper MIDI implementation).
              Or like I did: an old TD-7, works pretty good and it's also a spare module

              Groeten, Peter

              ------------------
              My bands: Meneer Van Zanten and The Shed (sorry, both in Dutch but you can see the pictures and listen to our songs)
              My bands: Meneer Van Zanten and The Shed (sorry, both in Dutch but you can see the pictures, videoclips and listen to our songs)

              Comment

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