Arcade Collecting > Pinball
JD pinball drop targets on the fritz
jspicher:
Hi guys,
Quick update on the status of my JD machine.
On the bottom of the drop target bank there are three screws that allow you to adjust the reset arm up/down. I was able to adjust these screws and get the drop targets working normally again. Problem is, it was a short lived fix; after about 8 games it was back to the continual drop/reset loop as shown in the video.
After doing testing on the unit l found that the opto that registers when the "G" target is dropped wasn't recognizing the dropping target every time (jiggling the opto board would help get it to register). So l pulled the opto board out and gently cleaned between each of the optos with a q-tip and some rubbing alcohol, hoping it was just dirt build-up. This didn't seem to fix the problem either.
After doing a bit of research l found that the drop target opto board (factory original) is poorly designed and prone to failure; and a new opto board was made available some time ago. I believe that's the case with mine. I've ordered the new opto board, new springs, drop targets etc and l plan on rebuilding the drop target bank and hoping that fixes the issue. Thanks for everyone's help!
jspicher:
Oh, I also picked up one of these with my order: http://www.pinballlife.com/index.php?p=product&id=1260&parent=0
Isn't that awesome?
jspicher:
hi pinballjim,
Well if it's a cracked solder joint, then replacing the opto board would do the trick yes?
If so, I hope one of us is right!
Thanks,
Q*Bert_OP:
--- Quote from: jspicher on July 27, 2010, 07:41:46 pm ---
Well if it's a cracked solder joint, then replacing the opto board would do the trick yes?
--- End quote ---
That's about as logical as replacing your car windshield because there's dirt on it. If you see any cracked solder joints, remove the old solder, then flow new solder.
jspicher:
Howdy Q*bert >> That's assuming that the problem is a cracked solder joint. The stock board l've got in the machine is prone to failure. For starters l'm not much of a soldering guy, as a matter'o fact l don't even own a solder gun anymore. Secondly I've already ordered the new part (getting delivered today) and at this point l'd rather re-build the drop target bank. The springs are in a near comical condition, the clips holding the current board in place are shoty at best and the board itself (l think) has failed due to bad optos, cracked solder or whatever.
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