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Help! Soundcraft cps275

Discussion in 'Consoles / Control Surfaces' started by Superman2107, Jan 6, 2017.

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  1. Superman2107

    Superman2107 Member

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    My cps275 +/- 17V light is not on, is it causing stop give the power to my console? I can see the lights on and off a sec when I shut down the cps275 on my console. Checked the fuse, doesn't seems like blew. Does anyone know what is happening?
     
  2. pcrecord

    pcrecord Quality recording seeker ! Distinguished Member

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    Does the console work ? if yes, it may just be the power light bulb. If not, well this answer your first question.
    If the light bulb is ok and fuses are ok chances are the unit is defective. Could be a few capacitors or resistances..
    If you have no experience in electronic diagnostic, bring it to a repare shop.
    Or buy another one and keep it as back once you made this one repared :
    http://www.ebay.com/itm/Soundcraft-...dio-Mixer-Console-CPS275-RW8022-/282063618136

    There is some schematics in the manual : http://www.lacompagnie-events.com/pdf/cps250_275_user_guide.pdf
     
  3. Superman2107

    Superman2107 Member

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    The console is not working, the light bulb of the cps? No, it doesn't light up, fuse should be fine. But how does that happen? What makes the capacitors or resistances stop working suddenly?
     
  4. Boswell

    Boswell Moderator Distinguished Member

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    This could be a fault in the console.

    Which exact model of console is this powering? Do the power supply lights stay on if you apply mains to the power supply with the d.c. output connector unplugged?

    The CPS275 manual says:
     
  5. pcrecord

    pcrecord Quality recording seeker ! Distinguished Member

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    Should is not a word to use when doing diagnostic..
    Many have blown the cps275 simply by pulling the plug without proper shutdown...
    Boswell has a good understanding of electronics. Follow his lead ;)
     
  6. Superman2107

    Superman2107 Member

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    Ghost 32LE, yeah PSU lights on but the +/- 17v light off
     
  7. Boswell

    Boswell Moderator Distinguished Member

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    Are you saying the +/-17V lights are off even when the power supply is disconnected from the mixer?
     
  8. Superman2107

    Superman2107 Member

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    Yes, even without connect to the console, the +/-17v light still off, is it a good or bad sign?
     
  9. Boswell

    Boswell Moderator Distinguished Member

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    It depends on how you view it. A linear power supply is easier to fault-find than a console, but against that you have the danger associated with working in a live mains environment.

    I can guide you through a diagnostic process, but I have to ask what your electronic repair skills are like?
     
  10. Superman2107

    Superman2107 Member

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    I opened it and one internal from +/- 17V fuse blown, but i couldn't find the right amps tho, I checked the manual says 5.25amps, but the fuse that blown was 10amps and the working one is 10 as well. any idea which one should i put in?
     
  11. Boswell

    Boswell Moderator Distinguished Member

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    The manual says F1 (for the +17V rail) and F2 (for the -17V rail) should both be 6.25A for the CPS250 PSU and 10A for the CPS275. You have the CPS275, so the 10A rating is correct. F3 protects the 48V rail, and should be 1A for both PSU models. Note that these fuses must all be T types, i.e. fast-acting - do not replace with a standard type.

    So which fuse number (F1 or F2) is the blown one?
     
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  12. Superman2107

    Superman2107 Member

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    Right that was the F2 one, is that suppose to be slow blow T types?
     
  13. Superman2107

    Superman2107 Member

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  14. Superman2107

    Superman2107 Member

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    Tried with the new fuse, it blow right away, probably the bridge recitifer? Is it the 10A 200V, mounted on the heat sink? Thanks!
     
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    The New AT5047 Premier Studio Microphone Purity Transformed

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