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Help Identify IC for SoundMixer PSU

Discussion in 'Troubleshooting and Repair' started by cyblaz, Apr 17, 2015.

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  1. cyblaz


    Apr 17, 2015
    The Power Supply of my Sound Mixer broked and I try my fix. The output of the PSU is + 48V, + 15V, -15V and 5V DC.
    I check the DC voltage on the bride diode to the input of the tranformer Bride is good, only the output from the IC that does not exist. I assume the IC is damaged. but the type in this ic has been wiped. Does anyone know what kind of IC's
    sorry for my bad english .TIA,

    [​IMG] [​IMG] [​IMG]
  2. davenn

    davenn Moderator

    Sep 5, 2009
    hi cyblaz
    welcome to EP :)

    what make and model is it ?
    have you tried googling for circuits, manual ?

  3. shrtrnd


    Jan 15, 2010
    And are there any markings on that IC? I can't tell from the pictures.
  4. cyblaz


    Apr 17, 2015
    Hi davenn,
    I've searched on google and found the manual that contains the schematic, but i think its a little different from my psu.
    CMIIW, In the schematic that I get, GND (-) is connected to pin 5 of IC but on my PSU GND (-) is connected to pin 3.
    It seems that both have the same functions with additional control on the IC that is in my PSU.

    Here's the schematic i'v got.
    I don't see any mark and I think it was intentional (?)

    Any sugest ?
    Last edited: Apr 20, 2015
  5. shrtrnd


    Jan 15, 2010
    I've spent 1/2 an hour trying to get a good print of your schematic so I can read it, with no luck.
    It'll be tough to ID the exact IC without markings, but I can't see enough on the schematic to even hazard a guess at the IC's function.
    Can you enlarge the section of the schematic in question?
  6. bsco


    May 8, 2011
    Looks like a 3842A.....power control IC....I had a look at you schematic with a 3842 IC data sheet and have a look.....also, if you can remove the chip and look at in on an angle, you might be able to see some markings.....
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