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Thread: Old PRT 32 x 24 Shopbot from the 90's

  1. #1
    Join Date
    Nov 2014
    Location
    Knoxville TN
    Posts
    33

    Default Old PRT 32 x 24 Shopbot from the 90's

    Hello, recently my z-zero plate stopped working. When I measured the voltage at the PC power supply connector to the PRT board, it is showing 5v on 1st pin, then 2 grounds and 12v on forth pin. However the pin 1 that the z-zero plate is connected to, on the main board, is only showing 1.1v. So my e-stop and my z-zero are not working. Any one ever had this happen? If there any surface mounted fuses or other components that I can check? Thanks!

  2. #2
    Join Date
    Nov 2014
    Location
    Knoxville TN
    Posts
    33

    Default

    UPDATE: So I moved the z-zero wire to pin 3 which had 5 volts. I changed the settings in my variables file to look for input 3 instead of input 1, and now it is working fine. However, I am still not sure what controls the 5 volts on pin 1. And why I am only getting 1.1v? Does anyone have the schematics for the PRT 90902. I believe it is verson 3.41 board. I would love to see what IC controls this and repair it. It this port blows, I am screwed. Thanks!

  3. #3
    Join Date
    Mar 2013
    Location
    Memphis TN
    Posts
    967

    Default

    You could use one of these instead of the plate:

    s-l1600.jpg

    https://www.ebay.com/itm/12189580040...oAAOSwB4NWzMUq
    ShopBot Details:
    2013 PRS Alpha 96x60x12
    4hp Spindle
    12" indexer
    Aspire
    Rhino
    Fusion 360
    Ferrari 360
    Prusa MK3S+

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