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Thread: Model 100 No power up

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  1. #1
    Join Date
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    Default Model 100 No power up

    I got one of these for nothing, and have been checking it out this morning. The battery compartment had a significant but not crazy amount of rust, which I've since cleaned. I can see just under 6V there.

    I also see a NiCD battery on the motherboard. When I tested it of course, it had close to 0v.. but after letting it sit with the AA batteries installed, it has risen to 1.6V. Do I need to wait this out a bit? I'm not sure if the 100 requires the NiCD to get going. I don't think my 600 did.

  2. #2
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    The NiCD has risen to 3.3V now. I'm surprised I'm getting anything.

    I guess the AAs charge it?

  3. #3
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    Okay, the NiCD seems to be charged and holding a charge. But no action otherwise from the machine. I was checking out the voltages on the motherboard at various points like VEE - and we've only got +0.87v on power up. So I'm going to guess we've got cap problems, problems with the battery holder/connection or such. Wish I had the power adapter.

  4. #4
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    If it helps, the power adapter is 6VDC @ 400 mA. The batteries will charge the NiCd battery which feeds the memory to maintain it while not in use. There's a switch on the bottom; make sure it's "On"

    You did try to change the LCD contrast knob? Sometimes it looks blank and just need adjustment.

  5. #5
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    Yeah it's not that for sure. When I was playing around with the batteries and cleaning the contacts, I noticed sometimes the 'low batt' light would come on, even though the batteries were brand new. It looks like the board has some significant corrosion damage, although so far traces look to have been spared.

    As a side note.. does anyone know the serial number scheme they used? I think this may be a very early one:

    20191012_171435.jpg

    Looking through a bunch on line, it seems they all start with a 3. I've not seen any lower than 301xxxxxx, (they seem to go up to 304xxxxxx) and mine is 301000089. All the chips on mine are date coded to mid 1982... that'd be really neat if I managed to luck out and by an early one. Not that that means much with these.

  6. #6
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    Default

    If you were after the original, why not look for the Kyocera 85? After all, Tandy didn't design or initially produce this thing.

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