Arcade Collecting > Pinball

JD pinball drop targets on the fritz

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jspicher:
Hi Guys,

I've just purchased my first Pin, a Judge Dredd machine in pretty decent condition, but l'm having trouble with the drop targets. They continually drop and reset themselves over and over - thus making the game sort'a unplayable.

Here's a little video of the problem l've uploaded to youtube:


I've tried adjusting the tension on the springs for each target both very little tension and then very tight it made not difference. I then adjusted the "feet" that actually lift the targets after they reset (thinking maybe one of them wasn't being pushed high enough to to hooked, but that didn't seem to fix it either.

Any ideas on what this could be?

studmuff:
It sounds like when you turn on the machine you are getgting an error on the DMD.  Does it tell you what it is?  if not, open the coin door and hit the far right service button.  It should tell you what the error is?  It could be a switch opto not working, could be the coil.  Remove the connector and reseat it on the 5-bank opto assembly board that controls the targets under the playfield.  Could be a wire off the connector or a cold solder joint on the header pins for the connector.  I don't own a judge dreed but I own Indiana jones.  It may not be the springs causing the problem.  Can you manually push on the bar that resets the targets to get them back up?  Do you still get an error?

Do you have a manual?

smartbomb2084:
Put the game in 'Switch Edges' test and see if all the switches for spelling J-U-D-G-E are always closed. They are all located in switch column # 5, in order, along with Left and Right slingshots and Captive ball #2.

smartbomb2084:
Looking at this video again I am really inclined to say that this is a switch problem.  Put the game in 'SOLENOID TEST' and check the operation of the drop target reset solenoid labeled 'DROP TARGETS' ( Sol # 5).  Be sure to CLOSE THE COIN DOOR or there will not be any 50 Volts to power the solenoids.

I heard the game in the video say "DON'T MOVE" which is an indication of the 'DRAIN SHEILD' ( Autofire that is ) activating. Is the ball in play being launched into the game and draining in this video or is the ball sitting idle in the shooter lane? If it is sitting idle I would say you definitely have a switch problem. Maybe leaky batteries took out U20 on the CPU board, column driver ULN2803A?

On a side note:   Don't run the game too much in this condition.  You are asking for trouble.

studmuff:
Wondering if you ever got the problem fixed?

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