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[Solved] Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance

yogi009 12408 12
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  • #1 16998132
    yogi009
    Level 43  
    The power supply is dead, you can see the parameters and the extent of the damage in the pictures below. Visible dark spots were created due to the melting of a thin layer of black sponge, which was the "padding" for PCBs. I know that it is the cheapest to buy another such power supply with given parameters, but maybe someone has knowledge and experience and will help in the repair of this miracle.

    Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance
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    #2 16998738
    398216 Usunięty
    Level 43  
    As with any repair of the inverter - it starts with checking the control and keying system. Then the surge protection system, capacitors ... I do not know how difficult this white adhesive will make it difficult for you. Depending on the type, it can go away from the plate and the elements very easily, and maybe so that you have to sweat a lot to remove it ...
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    #3 16999538
    marcin_marcepan
    Level 18  
    In my opinion, 18VDC with a capacity of 1300mA can easily be adapted from a laptop, you will need to replace the power supply-mixer cable.
  • #4 16999863
    yogi009
    Level 43  
    Yes, you're right Marcin, I even have a Dell power supply here (nominally 20VDC / 3.5A I'm just wondering how to break 2V.) A semiconductor diode (eg 3A / 40V) without load gives a drop of 50mV, 1N4007 ( of course, this one has too little current, but I researched dry) without load gives a 150mV drop. Probably at load this drop should increase to about 1V (at least this is stated in the note V F = 1.1V However, I care about the constant voltage, close to 18V. If there is no way out, I am looking for a ready 18V power supply and the right current, I just wanted to solve it differently, and I'm always happy to put a burnt module on my feet.
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    #5 17000305
    marcin_marcepan
    Level 18  
    Of course, you are right that it is always happy to put a burnt module on its feet, but is it worth it?
    Enter the address of the popular auction site plus, e.g. /universal-lowering-with-laptop--120w-csw-i6694839516.html
    You can find the rest yourself and maybe even cheaper.
    The question is why the original power supply "fell"
    As for breaking the voltage I will bet that there are additional stabilizers in the mixer anyway.
    Good luck
  • #6 17000510
    yogi009
    Level 43  
    It fell because it was Chinese, although signed with the Soundcraft logo, there is nothing to ask. I have already solved the subject of power, thanks to Colleagues from the forum I have transformed the power supply from Dell. Also, the forum is useful :-) Maybe somebody will someday put the schematic of this Soundcraft power supply, it's worth expanding the knowledge base. Greetings!
  • #7 17360496
    dersp
    Level 10  
    Guys, what about the PWM controller at 6 feet and the mark on the casing:
    61F38d
    27A
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    #8 19797114
    montertb
    Level 22  
    It is enough to replace the power supply with a more solid one, 18V / 1.5A.

    By the way, I will add that this mixer is produced by SP PRO AUDIO (UI12, UI16 models) with the "SOUNDCRAFT" logo printed on it. Only the UI24 model is made by an English company and the design is completely different, if only because it has classic microphone preamplifiers, which the lower models do not have at all ... :D
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    #9 20072504
    _eddie_
    Level 33  
    montertb wrote:
    It is enough to replace the power supply with a more solid one, 18V / 1.5A.

    By the way, I will add that this mixer is produced by SP PRO AUDIO (UI12, UI16 models) with the "SOUNDCRAFT" logo printed on it. Only the UI24 model is made by an English company and the design is completely different, if only because it has classic microphone preamplifiers, which the lower models do not have at all ... :D



    They have but packed in small black mergers. The sound gap is significant. As for the power supply, I used a "laptop" 20V (ui12) myself and nothing bad happened. The original one heats up very much.
  • #10 20073092
    yogi009
    Level 43  
    The topic is almost archival. It is not my intention to find another one, just to repair the original module. The mixer itself had already received such a (new) module, I was thinking about making this copy so that there would be a reserve.
  • #11 20073161
    montertb
    Level 22  
    _eddie_ wrote:
    They have but packed in small black mergers.

    No, they do not have a typical, classic preamp stage as it is customary to construct low-noise preamplifiers, mixers for about 40 years ..
  • #12 20073287
    dersp
    Level 10  
    EN
    I once repaired such a power supply and drew a primary diagram, but I have 2 more diagrams in the Soundkrafr folder. I am attaching all 3 files, maybe one of them will suit you.
    EN
    I once repaired such a power supply and drew a diagram of the primary, but I have 2 more diagrams in the Soundkrafr folder. I am attaching all 3 files, maybe one of them will suit you.

    Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance Repairing Soundcraft UI-12 Power Supply: Analyzing Damage and Seeking Repair Guidance
  • #13 20073710
    yogi009
    Level 43  
    Archived topic. Closing.
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Topic summary

✨ The discussion revolves around the repair of a Soundcraft UI-12 power supply, which has suffered damage indicated by dark spots from melted padding. Users suggest starting repairs by checking the control and keying systems, as well as the surge protection and capacitors. Alternatives to the original power supply include adapting a Dell laptop power supply, with discussions on voltage regulation and the potential use of diodes to achieve the desired output. Some participants note that the original power supply's failure may be due to its low-quality construction. Additionally, diagrams of the power supply are shared for reference, and it is mentioned that the UI-12 and UI-16 models are produced by SP PRO AUDIO, while the UI-24 is made by a different company with a distinct design.
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FAQ

TL;DR: Ui12 runs on 18 V DC at about 1.3–1.5 A; “It is enough to replace the power supply with a more solid one, 18V/1.5A.” [Elektroda, montertb, post #19797114]

Why it matters: This FAQ helps Ui12 owners quickly choose or repair a safe PSU and avoid repeat failures.

Quick Facts

What power supply does the Soundcraft Ui12 actually need?

Use 18 V DC with about 1.5 A available. This covers the mixer’s demand and startup headroom. A forum tech summarized: “replace the power supply with a more solid one, 18V/1.5A.” Choose a quality adapter and verify connector fit before powering. [Elektroda, montertb, post #19797114]

Can I run a Ui12 from a 20 V laptop adapter?

Yes—several users report Ui12 working fine on 20 V laptop bricks. One owner states they used a 20 V supply with no ill effects, noting the original adapter ran hot. If you do this, ensure correct polarity and a 3 A or higher rating. Also note a Dell 20 V/3.5 A unit was discussed in-thread. [Elektroda, eddie, post #20072504]

How can I drop 20 V to a safer ~18 V without a custom regulator?

Add one or more series silicon diodes to introduce a voltage drop under load. The thread author measured small no-load drops, expecting about ~1 V drop per diode at current. Aim for 18 V under real mixer load, not open-circuit. “I care about the constant voltage, close to 18V.” [Elektroda, yogi009, post #16999863]

Do I need to change the cable or plug when using a laptop supply?

Often yes. A contributor notes you can adapt a laptop PSU, but you’ll need to replace or rewire the power-supply-to-mixer cable. Confirm barrel size and polarity before soldering or using adapters to avoid shorts. [Elektroda, marcin_marcepan, post #16999538]

How do I start repairing the original Ui12 SMPS (inverter) board?

Follow a methodical sequence: check the control and switching (keying) stage, then surge protection, then electrolytic capacitors. Expect tough white glue that may require careful mechanical removal. “It can go away easily, or you have to sweat to remove it.” [Elektroda, 398216 Usunięty, post #16998738]

Give me a 3‑step quick test for a dead Ui12 PSU.

  1. Visual: inspect input fuse/NTC, MOV, and bulged capacitors; clear restrictive glue.
  2. Primary: test PWM switch devices and rectifier for shorts; verify startup resistor chain.
  3. Secondary: check Schottky diodes and output caps; power via bulb limiter. [Elektroda, 398216 Usunięty, post #16998738]

Why did the original power supply fail?

The thread author attributes failure to low build quality of the bundled unit. They replaced it with a converted Dell adapter and restored mixer operation. Overheating of the original was also reported by another user elsewhere in the thread. [Elektroda, yogi009, post #17000510]

Is there a schematic for the Ui12 power supply?

A member shared primary-side drawings and two additional diagrams from a “Soundkraft” folder. Review those images to match your board version before ordering parts. They posted three files for reference. [Elektroda, dersp, post #20073287]

Who actually manufactures the Ui12/Ui16 and Ui24?

One contributor states Ui12/Ui16 are produced by SP PRO AUDIO with a Soundcraft logo, while Ui24 is made by an English company and uses a different design. This affects serviceability expectations. [Elektroda, montertb, post #19797114]

Do Ui12/Ui16 have classic microphone preamplifiers like Ui24?

According to the same contributor, Ui12/Ui16 lack typical classic preamp stages found in traditional low‑noise mixer designs, unlike Ui24. If you compare noise and headroom, factor in this design difference. [Elektroda, montertb, post #20073161]

What is the PWM controller marked “61F38d 27A” on six pins?

A user asked to identify that exact marking, but no definitive ID was posted in the thread. If you find it on your board, trace pins to determine function and confirm by schematic images shared later in the thread. [Elektroda, dersp, post #17360496]

Are there internal regulators in the mixer that tolerate slight overvoltage?

One member suggested the mixer likely includes additional stabilizers, implying tolerance for a modestly higher adapter voltage. Still, target 18 V at the jack to minimize heat and stress on downstream regulators. [Elektroda, marcin_marcepan, post #17000305]

Is the topic still active or closed by the original poster?

The original poster later marked the discussion as archived and closed. Treat the shared measurements and diagrams as historical references and validate against your unit. [Elektroda, yogi009, post #20073710]

Any red flags or edge cases I should know before powering up?

Watch for overheated original adapters and for stubborn white adhesive that can hide cracked parts or carbonized paths. Use a bulb limiter on first power to avoid catastrophic failure after repairs. “You have to sweat to remove it.” [Elektroda, 398216 Usunięty, post #16998738]
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