Soundcraft Signature 12 MTK Power Supply down (need electronic layout of power supply)

My Mixing console can't power on.

I Open it, and see that one Resistor (R102) et one Condensator are down.

I need the right reference for the resistor (R102), i already change the condensator (100microfarad25v).
I can't determine the right colors fot the resistor. (it's 10ohms or not ???)

So i search the "schéma structurel du circuit imprimé" (electronic layout of the printed circuit board of the power supply".
So i could found the good information about this resistor.

I hope i can fixe this failure.

Sorry for my porr english.

Thanks for your help.



  • alxlucalxluc Posts: 5

    HELP PLEASE !!! Just need the reference of the resistor engraved on integrated circuit: R102 ! (10 ohm ?)
    Thank you.

  • HARMAN_RobHARMAN_Rob Sr. Manager, Professional Services Group Posts: 166

    Hello A.L, please contact your local Harman Pro Tech Support for this issue. Or, if you could post a picture of the resistor, the community may be able to help you further.

  • Hi, Thanks you for the answer.

    I ve got these pictures

    1550591324-20190129-150538.jpg - envoi d'image avec NoelShack
    1550591324-r102-1.jpg - envoi d'image avec NoelShack
    1550591324-r102-2.jpg - envoi d'image avec NoelShack

  • If someone could help me or send me the picture of his own power suplly.
    i already change the capacitor.

    I need the right ref of the resistor's colors indication

    • brown / black (?) / brown or gold (?) / Gold
      100 Ohms 5%

    • Brown / black (?) / gold (?) / gold
      1 Ohms 5%

    • Brown / Black(?) / red (?) / gold
      1k Ohms 5%

    I would swap the resistor and test the power supply before calling assistance.

    Thanks you.


  • alxlucalxluc Posts: 5


    You lost a client .

    I fix it... without soundcraft support...

    I never buy another product from your company,

    and won't provide positive publicity.


  • Hey Alxluc,

    i'm having the exact same problem! Could you tell me the details of both parts so I can also make the repair?
    Many thanks!

  • FergFerg Posts: 1

    Hi AL

    I have a Soundcraft signature 12 which is barely a year old and was working fine but now fails to power on , so very interested in your post and your solution any more details available ? re what parts I might need, and if a relative newbie could make this repair

  • My MTK 22 only has 30 hours of usage. R102 is already looking very BBQ. It looks like a 2W 75K carbon, though the purple stripe is almost indistinguishable from brown. My mixer still works and that resistor measures >60k so I think 75k is right. Put four of these back in series/parallel or a larger wattage part.

  • I can confirm it is 75k now that I pulled it out of the circuit. I'll be using two 150k in parallel.

  • alex69alex69 Posts: 1
    Same thing happened to me too.I did contact the soundcraft service at my country ( Greece) and the answer i got is that i have to buy a new power supply (the whole system there) for 100 euro.I am very disappointed and angry with this.
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