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  1. 07-01-2018 #5
    john swift's Avatar
    Lives in merseyside, United Kingdom.
    john swift
    Last Activity: 18-01-2021 Has been a member for 9-10 years. Has a total post count of 257. Received thanks 53 times, giving thanks to others 0 times.
    the BOB requires a 5V supply if you fit jumpers JN1 & JN2
    or two 5V DC supplies if jumpers JN1 & JN2 are not fitted

    Click image for larger version.  Name: ebay opto-isolated CNC BOB .jpg  Views: 315  Size: 197.6 KB  ID: 23551

    the circuit diagram is based on photos taken from the net !!

    John

    PS
    I assume the limit switches have NPN open collector outputs

    with just the 5V power connected to the BOB you should have close to 5V
    between the opto-isolator IC pins 3 & 4

    when you connect the opto-isolator pin2 to the input ground with a wire link the voltage across pins 3 & 4 should drop to close to zero volts (0 to 0.7v)

    it should be easy to change and damaged "817" opto-isolators

    PPS

    simple tester for similar BOB inputs

    Click image for larger version.  Name: BOB input tester & partial TX14175 circuit.jpg  Views: 401  Size: 365.4 KB  ID: 23552

    TX14175 circuit
    Click image for larger version.  Name: TX14175 circuit.jpg  Views: 311  Size: 283.6 KB  ID: 23553
    Last edited by john swift; 07-01-2018 at 03:46 PM. Reason: add ref to testing BOB input plus input tester
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