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Prosound 1600 amplifier repair

Discussion in 'Audio' started by Wayne Phillips, Jan 11, 2018.

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  1. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018
    This branded amplifier from a well known electronics store came to me for repair.

    The fault trying to power up said the owner?

    Well on opening it for a quick look I noticed the inrush circuit was missing a inrush ntc to slow the mass inrush voltage.
    What they seem to of done here was to add a cap across the relay that is also connected to the primary side of the transformer ie..as the mains power is applied ii feeds one part of the winding then after a second or so the relay clicks over and the cap is to smooth the spark.

    Poor idea..so a I have fitted a better inrush device and the amp is back working again.
     
  2. shrtrnd

    shrtrnd

    3,701
    462
    Jan 15, 2010
    I hope you added a 're-engineering fee' to the final bill.
    Good work.
     
  3. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018
    Yes..the odd think is, why was it such a poor design in the first place?
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    9,668
    2,019
    Nov 17, 2011
    It's mostly about money saved. Even pennies add up when you sell in masses.
     
  5. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018
    Just to make folks buy more electronic items when it fails..
     
  6. Wayne Phillips

    Wayne Phillips

    61
    1
    Jan 7, 2018
    Even the amplifier stage could of done with more devices to cope with meant to be 500w at 4 ohms!
     
  7. Subaru

    Subaru

    2
    0
    Jul 15, 2018
    Got a prosound 1600 amp,and the two power needles don't work and the sound is only coming on of one side?what can be done.
     
  8. kellys_eye

    kellys_eye

    4,277
    1,146
    Jun 25, 2010
    What would you LIKE to be done?
     
  9. Subaru

    Subaru

    2
    0
    Jul 15, 2018
    I WOULD LIKE TO TRY AND REPAIR IT
     
  10. kellys_eye

    kellys_eye

    4,277
    1,146
    Jun 25, 2010
    Find the workshop manual for it. Post a link to it and/or the schematic for the amplifier.
     
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