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New power supply, no schematic, looking for power fan plug.

By macx
Oct 16, 2005
  1. Finally broke down and started building a new system -
    I'm too old to game, this all started out as a home video

    Anyway - gathered all my components, now I'm working
    to assemble them.

    The case came with an Okia Model 500-ATX power supply.
    But no wiring schematic.

    I'm trying to identify the power supply fan plug - what seems
    to be it doesn't at all match the connector on the board.
    And I've got that positively identified by the board manual.

    The board has a small male 3 pin connection. The only thing I
    can find that might be the fan connector coming from the
    supply is a small 4 pin plug at the end of 1 of the strings of
    drive power harnesses. Nothing tucked up behind the
    supply case or anything.

    Is that likely to be it? Or would that be for a floppy or something?

    I tried to Google for a wiring schematic, but could find nothing.
    In fact, nothing much at all on this brand of supply - just
    a couple places that sell them. Please don't tell me I got
    an el cheapo that isn't worth having!

    At the risk of getting ahead of myself, in case I need to adapt
    something like that to the different style male connector on the
    board, in this case or something else I may find as i progress,
    is there some type of source for adapters, or what would I do?

    Bear with me, this probly won't be the last question I'll dream up -
    just getting started.

    While I'm at it - the board manual talks about a connector
    for a power supply that senses board temps - that's another reason
    I'd like to find a schematic or some sort of instructions for the power supply.

    OH! The connectors for the 2 fans in the case don't match the connector
    on the board, either. The board has another small male 3 pin connector
    for the case fan(s), but these have a larger, bigger pin, 4 pin connector.
    Again - I suppose it's adapter time? Guess I'll need that source!

    Thanks for helping an "old" computer student still (and probly always)
    in a definite learning curve!
  2. Nodsu

    Nodsu TS Rookie Posts: 5,452   +6

    There are basically two voltages available to you: 5V and 12V. Doesn't really matter where you get it from - some pin on the mobo or some wire from the PSU.

    From the PSU the yellow wires are 12V and red ones 5V, black is ground. The fan voltages should be written on the fan itself, the black fan wire is ground, red may be 12V or 5V depending on the fan voltage.

    Fan headers on the motherboard should be labelled so, check with a voltmeter what pin gives out what.
  3. macx

    macx TS Evangelist Topic Starter Posts: 720

    That's good to know and will help.

    The fan shows a red and a black wire looking thru the grill, but I haven't
    been able to trace it thru the housing to the bunch of wires coming out
    the other side. Maybe will have to disassemble it a little to track those

    The mobo manual labels the pins, so I do know that much.

    Trouble is, none of the female connectors coming off the PS match
    the pattern of the male pins for the board PS fan. So will need to
    find an adapter once I figure out which plug it is.

    I've narrowed it down, there are 2 cable sets coming out of the PS
    that both have power plugs for drives. One of those cable sets
    has a much smaller plug way at the end, so I think that's likely the
    right one, but don't want to guess and mess up the new board.
    If that's it, I'll have to either wire on a new female plug, or find
    an adapter.

    Thanks for the good start!
  4. Nodsu

    Nodsu TS Rookie Posts: 5,452   +6

    it would be much easier to just use a knife and some tape :p

    The small power connector from the PSU is for a floppy drive.
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