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  1. Front panel still needs work - I got sent a bunch...

    Front panel still needs work - I got sent a bunch of pillars and screws to fit it properly and the right size LED's that won't press against the perspex to fit at the weekend.
  2. I expect he's busy - I had no problem ordering...

    I expect he's busy - I had no problem ordering parts for my machine.
  3. And now fitted with the replacement top cover...

    And now fitted with the replacement top cover from imsai.net

    She's looking rather gorgeous.

    54473
  4. Indeed he (David Lightman) must have been quite...

    Indeed he (David Lightman) must have been quite spoiled with all that 'pro' kit he had in his room - although the computer might have been around 8 years old by then. I had a 200 C64 and a black...
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    What is the target machine for the boot disk ?

    What is the target machine for the boot disk ?
  6. Thanks Dwight. An hour after it sprang into life...

    Thanks Dwight.
    An hour after it sprang into life a box arrived with some replacement MR1121 power diodes, a capacitance/ESR meter (always wanted one anyway so this machine was an excuse) and a clamp...
  7. Its alive ! Dwight - thanks to your eagle eyes...

    Its alive !

    Dwight - thanks to your eagle eyes there was indeed a break in the solder joint on the rectifier board for those ground wires- it just looked like flux spill to me.

    Thanks also to...
  8. Brilliant - thanks for these - all very useful...

    Brilliant - thanks for these - all very useful and validation my machine is wired correctly now.
  9. Thanks Dave, Thats really useful. This is the...

    Thanks Dave,

    Thats really useful. This is the schematic for mine. Mine is clearly the high current version with the 2nd cap and the MR1121 diodes.
    From what I can tell this is exactly how my PSU...
  10. By the way I have been following the wiring...

    By the way I have been following the wiring convention documented below to make sense of the Tranex transformer wiring.

    Transformer wiring for PS-28D with the upgraded 30A Tranex starts on page...
  11. Hi Dwight - you might be on to something as there...

    Hi Dwight - you might be on to something as there appears to be a difference in wiring from the the 8V feed from the transformer on my machine.
    In my case the pair of (white) 8V feeds from terminals...
  12. Yes, it's the same power supply and indeed the...

    Yes, it's the same power supply and indeed the same 30A Tranex transformer as mine.
    Good to know there is another user out there with the early setup.

    Only odd thing on yours is that they used a...
  13. Thanks Jon - I actually have a pair of N*...

    Thanks Jon - I actually have a pair of N* Horizons I could test the boards in. I may end up borrowing the supply from one of those to get this IMSAI working.

    Thanks for the offer though.

    My...
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    Here are the ones I buy in the UK. ...

    Here are the ones I buy in the UK.

    https://www.ebay.co.uk/itm/Amstrad-Pc-6128-And-Plus-Pcw-8256-8512-Fd1-Dd1-3-Famicom-Disk-Drive-Belts-X-2/202300477888?hash=item2f1a0c51c0:g:5g8AAOSwva1a5GXp
    ...
  15. Anyone else have a 30A Tranex 4-3751 in their...

    Anyone else have a 30A Tranex 4-3751 in their machines ?
    What voltages do you see on the unloaded outputs ?
  16. Thanks Yes the diodes were checked while removed...

    Thanks
    Yes the diodes were checked while removed from the heatsink.

    There are 4 diodes in total for the 16V lines - it looks like two diodes for each feed - the pair of white link wires in the...
  17. I have taken a picture of the rectifier board...

    I have taken a picture of the rectifier board (below)

    Both of the 8V power diodes seem to be fine - at least they pass the diode check on my meter.
    I have cleaned up the rectifier diodes and...
  18. Caps could well be empty. I'm not entirely...

    Caps could well be empty. I'm not entirely convinced the transformer is ok either. Do you know what AC voltages I should see on the secondaries ?
  19. After a coupe of hours of running things have...

    After a coupe of hours of running things have settled down a little.

    -16 is at -18
    +16 is at 16
    8V is at 8V

    I think unloaded these are in range.
  20. Machine is up to 110V but the Unloaded DC...

    Machine is up to 110V but the Unloaded DC voltages (no backplane attached or cards installed) are all over the place

    8V sitting at around 6.5V
    -16V sitting at -19.5V
    +16V sitting at 14V

    The...
  21. Slowly does it. Just 'forming' the capacitors...

    Slowly does it.

    Just 'forming' the capacitors with low voltages from the variac to bring them back gently into service - it's like watching paint dry.

    Thankfully no sparks, shorts or surprises...
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    Possibly - it was reasonably cheap and local to...

    Possibly - it was reasonably cheap and local to me (Chichester) - I almost wish you had bought it :D

    These video processors are quite expensive chips to replace.
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    yes indeed.

    yes indeed.
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    Thanks - I'm pretty sure the 5037 is fine - I...

    Thanks - I'm pretty sure the 5037 is fine - I suspect the 8002.
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    AVM Eagle II no video signal

    Folks,

    so I have this machine and it boots ok from floppy disk (I can see it access disk and respond to keyboard commands) but doesn't display anything on the screen.

    CRT is fine and it is...
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