TNC145 monochrome output to VGA?
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  1. #1
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    Default TNC145 monochrome output to VGA?

    Men

    i Have a Bridgeport interact with the h.h TNC145 control, the monochrome monitor is getting almost to degraded to be able to see!
    ive been thinking of converting it to run a VGA monitor this is my plan ....

    i think i found the outputs as follows

    57-30240 AMPHENOL CONNECTOR[/U]
    23,24: +12V
    21,22: Gnd
    18,19: Video
    16,17: Grey/Intensity
    4,5: V-sync
    2,3: H-Sync
    6,7: Signal Gnd

    vga-pinout.jpg


    i plan to chop and solder an old 14pin VGA cable as follows

    ill attach h-sink and v-sink
    The video output to green+
    Signal ground to green-
    and leave the rest unconnected

    i think voltages on h-sin/v-sink will be ok, but im not sure about the video cable meshing up?

    has anyone done this or knows what voltage/current im likely to see on the video output?

    thanks

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    this shows how it should be done:


    I did a mock up to test the circuit in case I ever need to change displays on my TNC155 and TNC355, it did work with TNC355 (did not test the 155) and the oldest lcd panel I could find but wasn't stable, maybe the signal level was low or the lcd didn't like the sync frequency - it would display the image for a second or two after switching on the lcd panel and then cut out with "no video signal" message, but while the image was there it was correct - bright letters on black background

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    That looks great , do you have a components list for an electrical dummy ?

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    It is an inverted MGA signal. If you hook a MGA monitor up to it, it will be inverted[bright screen dark letters, visible retrace]
    It was the synch frequency IIRC that causes issues with VGA

    hafta watch that video

    still have a couple spare old monitors

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    THe 31.3 khz 58 hz displayed in the video seem like standard VGA numbers, which, I don't think, are what the Heidenhain are putting out. I assume the monitor is converting the signal to something it can use

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    I vaguely remember that the line frequency was around 31kHz coming out of TNC, at least the 355 I hooked the setup to

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    Quote Originally Posted by jz79 View Post
    I vaguely remember that the line frequency was around 31kHz coming out of TNC, at least the 355 I hooked the setup to
    I'think'the 355 is a different monitor

    I hooked up the ooooooooooold monochrome monitor, which should be MGA, which should be like 17khz and it worked as I described, a readable image but inverted logic

    Some monitors have a wide range of frequencies they will synch to, many will not go slow enough

    The video the monitor has sync in the name, so I am thinking it is not a 50 dollar ebay monitor

    There is discussion online about running old computers in new monitors, and it is rarely that simple

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    Cheers gustafson those adapters will have to be modified though to get the 57-30240 AMPHENOL CONNECTOR to work.

    Im going to crack on with my vga mod, working in the inverter diodes jz79 posted.
    ive got a few old vga monitors i can pop if needs be!

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    Do you have the wiring diagram you show in this video ?
    im not sure of the 57-30240 AMPHENOL pin outs now ?

    cheers

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    Not my videos

    There are service manuals available either in heidenhain.com or elsewhere that have schematics forthe TNC 145,151

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    yes i meant jz79

    i had a go at the inverter circuit above couldn't get it to work for my tnc 145, i reckon the mce2vga would have worked though.

    I ended up sweating off the glass from the cr tube, cleaning the injected glue film away and re-seating with adhesive silicone.
    looks good before.jpg9.jpg2.jpg1.jpg

    with much help form this guys vid .. CRT Cataracts: Identification, Removal and Repair - YouTube

    putting it back on later fingers crossed it still works!

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    Before
    before.jpg
    After- much better !
    after.jpg


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