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Anonymous
Anonymous Posted on Jan 08, 2010
Answered

The required fuse is 1.6 A / 125V an is blown, I wen to radio shack and bought a 1.6A/250V and it has blown 2 already, what can I do or check to fix it? This is a Sony Sub-woofer model sa-wmsp1.

  • 4 more comments 
  • Anonymous Jan 08, 2010

    Thank you for the quick response! I just meassured the D401 and obtained a 85.5 K Ohms, 0.002 V, and a 0.001 A or 1 mA. As far as the IC301 the resistances are giving a good measurement (dont have the value of them yet), but I noticed two of the legs for the LM3886TF chip (IC Audio amp chip) are discolored black, this legs are according to the datasheet number 6 and 7 (GND, NC), could this be the problem?

  • Anonymous Jan 08, 2010

    Thank you for the quick response! I just meassured the D401 and obtained a 85.5 K Ohms, 0.002 V, and a 0.001 A or 1 mA. As far as the IC301 the resistances are giving a good measurement (dont have the value of them yet), but I noticed two of the legs for the LM3886TF chip (IC Audio amp chip) are discolored black, this legs are according to the datasheet number 6 and 7 (GND, NC), could this be the problem?

  • Anonymous Jan 08, 2010

    Thank you for the quick response! I just meassured the D401 and obtained a 85.5 K Ohms, 0.002 V, and a 0.001 A or 1 mA. As far as the IC301 the resistances are giving a good measurement (dont have the value of them yet), but I noticed two of the legs for the LM3886TF chip (IC Audio amp chip) are discolored black, this legs are according to the datasheet number 6 and 7 (GND, NC), could this be the problem?

  • Anonymous Jan 08, 2010

    Ok, would that be CN301, CN302, or CN101 plugs?

  • Anonymous Jan 08, 2010

    Ok, would that be CN301, CN302, or CN101 plugs?

  • Anonymous Jan 08, 2010

    Ok, would that be CN301, CN302, or CN101 plugs?

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1 Answer

Anonymous

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  • Master 10,594 Answers
  • Posted on Jan 08, 2010
Anonymous
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Hi,
If power transformer T1 got shorted or its output voltage got shorted for some reason, fuse will blow in Sony SA-WMSP1 active subwoofer.
Check power transformer, D401 bridge rectifiers and IC301 power amplifier out chip. Any of them is bad.
Let me know if you have additional question.
Thanks.

  • 1 more comment 
  • Anonymous Jan 08, 2010

    Thank you for the quick response! I just meassured the D401 and
    obtained a 85.5 K Ohms, 0.002 V, and a 0.001 A or 1 mA. As far as the
    IC301 the resistances are giving a good measurement (dont have the
    value of them yet), but I noticed two of the legs for the LM3886TF chip
    (IC Audio amp chip) are discolored black, this legs are according to
    the datasheet number 6 and 7 (GND, NC), could this be the problem?
    =====================================================================

    Check continuity of primary of power transformer, that should not show very low ohms.
    Unplug transformer secondary plug from circuit board, put fuse in circuit and plug the wire in AC, does fuse blow again? if yes, transformer is bad and if not, then output chip is gone.

  • Anonymous Jan 08, 2010

    I just replied your question.

  • Anonymous Jan 08, 2010

    Oh ok, I was incorrect about secondary connectors as transformer secondary pins are soldered in PCB, remove solder from pins and do the test.
    Your question was premium few minutes before and now I see it as free, what happened with it?

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