(Topic ID: 255445)

Dirty Harry


By Melvyns28

28 days ago



Topic Stats

  • 12 posts
  • 4 Pinsiders participating
  • Latest reply 8 days ago by Melvyns28
  • Topic is favorited by 2 Pinsiders

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    #1 28 days ago

    I just picked up a DH. during inspection I noticed that the knocker was unplugged in the upper left of head. Since I bought it from a location, I figured the bar didn't like the noise. On start up the coil fires exactly 10 times every time I turn on the machine. I turned it off and came back the next day and made some standard adjustments and now the gun coil fires 10 times and not the knocker. I clear all adjustments to stock and still coil fires 10 times apron start up. In the manual it doesn't say anything about that as I was figuring that 10 fires would point me in a direction of something wrong. The game plays great other than that. Any help on this would be great.

    #2 28 days ago

    I'm thinking there could be two issues.

    First, do a switch test and see if any switches, especially optos, are malfunctioning. I'm guessing there might be a bad one somewhere, and the game is trying to fire the coil associated with the switch to clear a potential ball jam.

    Then at the same time, there could be an issue with which coil is actually trying to be fired. Go in to the coil test with the knocker connected, and go through each coil to see if any fire incorrectly.

    #3 28 days ago

    I did a coil test. All coils are operating like they should. Also I just blew fuse F104. I replaced it and worked. I made a few adjustment Like free play e.c.t. the fuse blow again. I'll do a switch test next.

    #4 28 days ago

    Could be a bad diode or shorted coil somewhere blowing the fuse.

    #5 28 days ago

    I had very similar problem in thread linked below - was a bad opto. Someone commented that the firing of the coil is/was a WPC feature to let operators know there was a problem

    https://pinside.com/pinball/forum/topic/dirty-harry-gun-magazine-solenoid-firing-multiple-times#post-4373004

    #6 28 days ago

    Had to go back to work for a few hours. Ill check these possible issues and let ya'll know.

    #7 27 days ago

    This might be the culprit. Not sure on the fuse blowing but replace again and so far so good.

    7DFAF1AD-4387-4D9E-B782-C4CC93785AD8 (resized).jpeg
    #8 24 days ago

    The game since reconnecting the opto wire has been working great until this evening. We played a few hours and at the end f the last game, I got a match and a few other things and the knocker hit a few times then stuck on and burned until the fuse blew. Not sure where to look at this point. I disconnected the knocker and the game still works great. Any help?

    #9 24 days ago

    Maybe the knocker has a bad diode or the coil has a short?

    #10 24 days ago

    Well The knocker definitely has a short. The knocker doesn't have a diode connected to it. so I'll have locate it
    and check it on the board.

    #11 24 days ago
    Quoted from Melvyns28:

    The knocker doesn't have a diode connected to it.

    This is normal.

    Quoted from Melvyns28:

    I'll have locate it and check it on the board.

    D27 on the power driver board.

    You should also check Q68 and Q67 on the power driver board.

    2 weeks later
    #12 8 days ago

    Update sorry I had to put this on the back burner. I ordered a new coil and problem solved. I was over thinking it all.

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