Home Forums Vintage EHX Small stone not working, blew resistors

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  • #193634
    Grogers99
    Participant

    My small stone 4800 blew 2 resistors, R1 and R27. I replaced them but still not working. I checked all op amps and got 18v on pins 4 to 7. Any ideas? Thanks in advance.

    Here is the schematic

    https://images.app.goo.gl/F8VEwSgReQdCY1gYA

    #193635
    The EH Man
    Moderator

    You shouldn’t have 18v anywhere. What are you powering it with?

    #193636
    Grogers99
    Participant

    9v battery

    #193637
    Grogers99
    Participant

    Could I have another bad resistor?

    #193638
    The EH Man
    Moderator

    Maybe, but if resistors blew then you had to be powering it with something larger than 9v. I’d venture that some ICs are blown.

    #193639
    Grogers99
    Participant

    I was powering with a 9v isolated power supply when they blew. Could one bad IC cause 18v output on all of them? Could it be a faulty transistor? Guess I am not quite sure where to start tracking down the problem since output reading on all IC’s is the same and the three electrolytic caps and the 4 transistors have continuity. Thanks.

    #193640
    The EH Man
    Moderator

    Continuity is not a good thing. At this point you’re probably better off sending it to a tech.

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