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Soundcraft UREI 1601 - master bus problem

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    #1

    Soundcraft UREI 1601 - master bus problem

    Hi Everyone,

    I have a problem with UREI 1601 which is a digital DJ mixer. There is no sound on MASTER OUTPUTS despite the fact that on MASTER CUE everything works fine. I checked control voltage on master pot, there is none. So I'm looking for the source of the CV, and also the source of signal for IC10 which is MASTER OUTPUT buffer, but it is a multilayer board and I already spent a two days on it. Does any one have any clue? Or maybe schematics? I could not find one anywhere. Or some advice from more experienced circuit expert on how to look for it.
    I asked for help at Soundcraft support but they're not responding.

    https://www.soundcraft.com/en/products/urei-1601

    Something about the device:
    There is a DSP board with buffers, ADC/DAC and BLACKfin processor.
    There is Control Surface board with control voltage (CV) pots and faders, ADC for CV, some buffer stages (there is the one for MASTER OUTPUT on NE5532).
    Two I/O boards but they don't play any role in the problem.

    I'm a new guy on the forum so don't hesitate to comment on how poor/good is the info I provide, please be forgiving or something
    Tags: None
    #2
    Re: Soundcraft UREI 1601 - master bus problem

    This should help. Do the VU leds indicate anything? Do you have booth out?
    Attached Files
    Last edited by R_J; 04-23-2018, 07:03 PM.

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      #3
      Re: Soundcraft UREI 1601 - master bus problem

      Geeez, how did you get it? Nevermind. No VU, don't show anything, no signal on booth out. I'm getting my hands on it with the schematics. Thank you very much!

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        #4
        Re: Soundcraft UREI 1601 - master bus problem

        I have the technical manual , it shows the block diagram
        Attached Files

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          #5
          Re: Soundcraft UREI 1601 - master bus problem

          R_J, you have some really nice stuff.
          I found out that DAC (IC4 on DSP) does not give output. All the voltages around IC4 are exactly the same as around IC5 and IC6 which are working fine, IC4 gets the same data on inputs, so that's why I think it's a DAC failure. I'm almost sure..

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            #6
            Re: Soundcraft UREI 1601 - master bus problem

            Thanks R_J. I'm trying to find schematics for urei 1601S last 10 years!

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              #7
              Re: Soundcraft UREI 1601 - master bus problem

              Problem solved, DAC replaced after month of shipping

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                #8
                Re: Soundcraft UREI 1601 - master bus problem

                I'm having an issue with my UREI 1601 and I can't decide where to start looking. It has this clicking noise on all outputs (master, booth, cue).
                And inputs too (it's outputting the click on the inputs jacks too)

                https://soundcloud.com/tsvnst/urei-clicks/s-AZKWAwjr9gx

                Has anybody experienced this before?

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