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Class D SMPs Combi

Discussion in 'Audio' started by Ike Mhlanga, Apr 6, 2021.

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  1. Ike Mhlanga

    Ike Mhlanga

    6
    1
    Feb 12, 2018
    Hi,
    Can someone kindly help me identify this Class D SMPS Combi amplifier.
    If Possible I need schematics.
    Any information that might help with repairs.
    Unit Blew Power Fuse.
    Amp Alarm OK
    SMP Alarm OK
    DS Alarm Flagged
    Regards

    Ike
     
    Last edited: Apr 6, 2021
  2. bertus

    bertus Moderator

    1,677
    651
    Nov 8, 2019
    Hello,

    Do you have more details on the amplifier?
    Wich brand and type?

    Bertus
     
  3. Ike Mhlanga

    Ike Mhlanga

    6
    1
    Feb 12, 2018
    I do not have a brand but I have a jpeg picture of it. But its failing to load. Thank you.
    I must be doing something wrong uploading.
     
  4. Ike Mhlanga

    Ike Mhlanga

    6
    1
    Feb 12, 2018
    Good Afternoon,
    I have taken a picture of it but its failing to up load.
    Maybe I am doing something wrong.
     
  5. bertus

    bertus Moderator

    1,677
    651
    Nov 8, 2019
    Hello,

    Resize the picture. The forum will accept pictures of about 300 kB.

    Bertus
     
  6. Ike Mhlanga

    Ike Mhlanga

    6
    1
    Feb 12, 2018
    Ok Thank You Very much.
    Here it is. I hope it is clear on your end
     

    Attached Files:

  7. Ike Mhlanga

    Ike Mhlanga

    6
    1
    Feb 12, 2018
    This is the Class D amp. No details on the board as regards the manufacturer.
    The only thing there is are the following:
    PN30302
    Rev AQ
    RRA2017
    Regards
    Ike
     

    Attached Files:

  8. WHONOES

    WHONOES

    1,115
    310
    May 20, 2017
    Got absolutely nothing from a gooooooooogle search.
     
  9. dave9

    dave9

    1,048
    279
    Mar 5, 2017
    Even with 300K pic size limit, you could do a lot better than that including other sides of it.

    Is it modularized with the left board just a PSU function and the right, connected by wires, the amp board?

    If so, unplug the amp. Try PSU without amp, and try amp with a different PSU. Ideally a current limiting PSU. Somewhere on the board, for example the amp IC, or capacitor ratings, should be hints about a voltage to try. If nothing else I'd try half the rating of the electrolytic caps in the middle of the board, thinking that looks like a dual rail PSU.

    Among the many suspects, I'd suspect a transistor first.
     
  10. bertus

    bertus Moderator

    1,677
    651
    Nov 8, 2019
    Hello,

    As said, the picture is to small to see anything.
    You could take pictures of the following sections:
    Ike SMPS class D sections.jpg
    Make pictures of the top and bottom of the given sections.
    Make them about 300 kB each.

    The red section is the high voltage switching part of the SMPS.
    The orange section is the low voltage part of the SMPS.
    The yellow section is the Class D amplifier.

    As @dave9 said, you could try the Class D amplifier on an external power supply.

    Bertus
     
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