(Topic ID: 237514)

Tech help: System 11 coil locks on (High Speed) not usual suspects


By shacklersrevenge

1 year ago



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  • Latest reply 1 year ago by shacklersrevenge
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    #1 1 year ago

    The coil for the right hideout is locking on and blowing the fuse.

    Coil is good, I jumped the wires to the opposite side, same result- locks on.

    The relay for the right side energizes at power on (not sure if this is correct or not)

    Tip 122 replaced with tip 102 at q22 and tests good.
    All predrivers are okay.

    Removed j18 and it still blows the fuse, indicating it’s on the board.(fuse holder pictured below)

    Lastly, with connector j11 disconnected, fuse will not blow.

    Anyone have any ideas?

    Thanks, James
    8CF66BF1-DDFF-4D21-9247-670DBF708E35 (resized).jpeg

    #2 1 year ago

    J18 is for the special solenoid, which this isn't.

    Did you also replace the pre-driver Q18? (2N4401)
    If yes, check U19. (7408)

    #3 1 year ago
    Quoted from Inkochnito:

    J18 is for the special solenoid, which this isn't.
    Did you also replace the pre-driver Q18? (2N4401)
    If yes, check U19. (7408)

    Yep, U19 was the problem child. All is well now
    Thanks!

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