Compaq Deskpro EN PSU

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  • 999999999
    Badcaps Veteran
    • Sep 2006
    • 774
    • USA

    #21
    Re: Compaq Deskpro EN PSU

    Did you diode check the rectifier bridge with a meter? It's not impossible to blow one but they have peak forward surge ratings really high (high enough to trip a home circuit breaker or blow fuse before they'd fail).

    For example yours is a typical GBL08 like this rated for 4A continuous, 800V (the "08" part), 150A peak surge. You have a lot of latitude here, if you had a spare equivalent of a GBL(nn) rated for 4A or more and at least 400V it would be ok, but of course higher than 400V and 4A is even better but beyond a certain rating may not fit on the PCB, AND some package types are old with a plastic case epoxy filled which are thicker (maybe too wide to fit next to other components).

    The difference in cost of these inline packaged bridge rectifiers is so small that practically any scrap computer PSU would have a donor you could use, or order at any electronics or surplus 'site taking note of the lead spacing as it is larger in higher rated parts.

    For the transistors put "2S" in front of the number so you have 2SK3324

    MOV datasheet here, yes it's 240V rated TVR10241 You can get an equivalent part from many suppliers at Digikey, etc, or take one from a scrap PSU.
    Last edited by 999999999; 09-14-2007, 12:13 PM.

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    • stevo1210
      Badcaps Legend
      • Oct 2006
      • 4156
      • Australia

      #22
      Re: Compaq Deskpro EN PSU

      For the replacement rectifer bridge, can I use a 6A 800V bridge??
      Like this one: http://au.farnell.com/jsp/Semiconduc...questid=168654

      As for the MOV, will this one be suitable? 150VAC 24.0J.
      Like this one: http://au.farnell.com/jsp/Passive+Co...sp?sku=1004297

      As for the primary switching transistor, I'll replace that one If the fuse blows when I switch the PSU on after the new MOVs and rectifier are installed.

      Thanks.
      Don't find love, let love find you. That's why its called falling in love, because you don't force yourself to fall, you just fall. - Anonymous

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