Gorgar
Williams, 1979Need help troubleshooting my Gorgar "Gar" Drop Targets. I do not get a reset at the start of game, ball, or when all targets are down.
On Solenoid Test, no fire on 03.
On the switch test, "G" drops and 41 appears. Same with "A"= 42 and "R" = 43, but no immediate change to 44.
What is the likely culprit and where should I start. Already replaced the horseshoe contacts. Thanks.
ElkGrovePinball If the solenoid isn't firing in test you'd need to figure that out before working on the switches. If it's not something obvious like a loose wire I'd suspect the transistor on the driver board, or possibly a cold solder or connector issue. Do you know how to test the transistors with a multimeter?
Chalkey Just getting into the troubleshooting, so no I don't know how to test the transistors in particular. But willing to research or accept some instruction from someone like you. Thanks.
I'm at pinburgh or I'd do something more detailed but try the "how to test a transistor" thread on this site. Basically set your dmm yo ohms and compare values between your 3 transistor legs to those on the working transistors on the board. There may be an unused but good transistor you can steal from the board.
Take a wire lead, figure out which transistor fires that coil, touch the wire to the metal part of the transistor and the other end of the wire to ground. If the coil fires, your wiring is fine, if it doesn't start metering for continuity. That's where I would start. It will at least narrow down where to start looking.
Thanks for all the input. I am learning a lot.
Update: We ran a wire lead from the Q19 transistor to ground and no fire. Just to verify we were doing it correctly, we ran the lead wire from Q21, the "GOR" transistor, and indeed the coil did fire.
Then we checked for wire continuity from the "GAR" coil to the driver board and we do have continuity.
But going back before the post, I had replaced the "GAR" coil because it looked fried (see attached photo). Now looking at the Q19 transistor area, there is also an area that looks burnt (see attached photo). I assume this is all a part of the issue.
Any thoughts on the next step or should I have an experienced service technician make the repair?
20180728_193455 (resized).jpg20180728_195732 (resized).jpgWanna join the discussion? Please sign in to reply to this topic.
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Elk Grove, CA
Halifax, NS