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Thread: Lucent 715GBCS-2 Terminal Repair

  1. #1

    Default Lucent 715GBCS-2 Terminal Repair

    Saved this one from the dumpster years ago.

    When powered up I get a short beep followed a few seconds later by a continuous tone.
    No image on the screen.
    No high voltage to the CRT.
    Pressing clear on the keyboard stops the beep.

    Found two capacitors on the main board with high ESR.
    After replacing them I get high voltage on the CRT and this image and the error tone.
    IMG_1582.jpg

    This memory chip has obviously failed.
    IMG_1588.jpg

    After removing the bad memory chip I now get this on the screen and the error tone.
    IMG_1584.jpg

    I couldn't find a replacement Winbond W24258S-70LL.
    Digikey had an Alliance AS6C62256A-70SCN that the datasheets showed should work so I ordered a few.
    Here is a picture of the new chip installed.
    IMG_1587.jpg

    Now I get this on the screen.
    IMG_1585.jpg

    Successful repair!

    Now to get this connected to my Gltchworks VCF East XIII 8085 Single Board Computer.
    http://www.vcfed.org/forum/showthrea...Board-Computer

  2. #2
    Join Date
    Aug 2009
    Location
    Oslo, Norway
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    Default

    Nicely fixed!
    Torfinn

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