Convert 120v to 230v - audio amplifier

Discussion in 'Analog & Mixed-Signal Design' started by thanhdn9x, Oct 25, 2014.

  1. thanhdn9x

    Thread Starter New Member

    Oct 25, 2014
    3
    1
    Hi,
    I have a QSC PL 4.0 audio amplifier. It's 120v version. I need it run at 230v, and have the schematics of this. I have attached it to this post.
    According to the Ac Filter sheet, I disconnect W1 and W2, connect W3. Is this right?
    Please let me know,
    Thank you!
     
    Kihembe likes this.
  2. #12

    Expert

    Nov 30, 2010
    18,094
    9,676
    How about saving me 15 minutes and telling me which page you're talking about?
    That schematic is so hard to read!

    Page 6, B2? T801?

    and where is the other end of J812, pins 3 and 4?
     
    Last edited: Oct 25, 2014
    thanhdn9x likes this.
  3. thanhdn9x

    Thread Starter New Member

    Oct 25, 2014
    3
    1
    Yes it is. Sorry I'm an amateur! It's realy hard to read and... find somethings!
     
  4. #12

    Expert

    Nov 30, 2010
    18,094
    9,676
    Repeating myself: Starting from page 6, area B2, T801...Where is the other end of J812, pins 3 and 4?
    and Page 6 area C4, where is the other end of J811?
     
  5. thanhdn9x

    Thread Starter New Member

    Oct 25, 2014
    3
    1
    I'm looking...
     
  6. #12

    Expert

    Nov 30, 2010
    18,094
    9,676
    Well, at least I don't feel quite so inadequate if it takes you this long. :rolleyes:
     
  7. Kihembe

    New Member

    Aug 10, 2017
    4
    1
    Hi There,
    Sorry for waking up this old thread, but i find myself in the very same position and can't find an answer online. Did you succeed converting these amps?? I have two that i just purchased and badly need to convert them for 230v operation up from 120v.
    All help appreciated.
    Conrad
     
  8. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
    7,601
    1,260
    For 240V AC, use Transformer input J702, J703, and Remove links W1, W2 and connect W3,

    This will wire it for 240Vac.
     
  9. Kihembe

    New Member

    Aug 10, 2017
    4
    1
    Thanks a lot. Will get back to you once I have these babies in my hands. Currently being shipped my way.
    Conrad
     
  10. Kihembe

    New Member

    Aug 10, 2017
    4
    1
    Hey Dave,
    So my 2 amps arrived and I switched the jumpers as instructed above in the first amp (removed w1, w2 and connected w2), the transformer input connectors were already at J702 and J703 so I didn't change there. On connecting to 120v amp didn't start. Switched to 240v and there was an explosion and there's a burnt area on the lower board. Am now scared. Second amp runs good on 120v. Did I mess up or the amp was already flawed? This is a 21year old amp BTW.
    Conrad
     
  11. Kihembe

    New Member

    Aug 10, 2017
    4
    1
    Opps,
    Yes indeed i screwed up. Didn't know i had to swap out the transformer input from J701 to J702 and remove the one on J702 completely, Several repairs and the amp is happily running at 240v. Luckily no output devices were blown. Just some diodes etc.
    The second amp was converted without issues.
    Conrad
     
    ebeowulf17 likes this.
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