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Thread: Superbrain Power Supplies

  1. #1
    Join Date
    Nov 2017
    Location
    UK, South East
    Posts
    127

    Default Superbrain Power Supplies

    So I have just managed to acquire another pair of Intertec Superbrain machines - a Mk1 and Mk2 QD.
    The former machine interestingly has the 5MB hard drive option installed........

    I have not tried powering up either machine yet as I noticed that although it has a UK 240v plug attached the manufacturers sticker on the rear indicates it a 110V machine (x in the 110V box rather than the 240 box)

    Before I strip the machine down and look at the PSU (its a pain as its buried at the bottom of the machine) - does anyone know if the PSU's in these machines was 'selectable' to either 110 or 240 supply ?

    Thanks.
    Last edited by zippysticks; September 22nd, 2018 at 08:43 AM.

  2. #2

    Default

    For the record (as we just discussed via email), the UK Superbrains had step down transformers (240v-115v) fitted internally so that they could run on UK voltages. Mine has a great fat toroidal transformer which is definitely over specified, and the one I just restored has a smaller standard type. Maybe UK suppliers were importing US models and converting them on arrival (I saw a picture of one Superbrain with a UK dealer label covering the Intertec voltage spec label on the rear of the machine).

    If the hard disk has any data on it it needs to be preserved.

  3. #3
    Join Date
    Nov 2017
    Location
    UK, South East
    Posts
    127

    Default

    Thanks Jon.

    Yes one of them (with the hard drive) has a very large toroidial - the other has the mains filter you showed on stardot and a smaller 'standard' stepdown.

    The Superbrain II powers up and partially reads the boot disk we created so I hope it just needs a good strip down and clean. This one has a green screen monitor rather the black and white of my other SB II.

    The Superbrain I with hard drive shows no signs of life beyond 12v available on the drive molex (no 5V) so I suspect I have some supply problems that need investigation.
    Last edited by zippysticks; September 23rd, 2018 at 03:13 AM.

  4. #4

    Default

    You need a dummy load on the 5v rail to test it. Use a 12v bulb as I show in the StarDot thread.

    Second, the weakness in the PSU is in the board, not the step down. On its own it probably cannot drive the hard disk's motor. I bet there is another PSU hiding under the monitor. If not, and the HDD is connected to the SB PSU's 12v rail, I can guess why it might have popped. If the PSU failed it probably took parts of the mainboard with it. I think that's why mine was toasted.

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