Having recently acquired a 1971 Williams Doodle Bug I've been learning how to fix items that were not work on it. I'm having some weird scoring issues now that I've connected up the Match-Unit that previously not connected.
The behavior that I'm seeing is that when the ball lands in the Advance Target Light hole at the top of the play field this does not advance the light. Instead there are several other bumper that when hit advance it along with popup bumpers. See play field photo where I've circled in black the points that advance the target light. The Match-Unit bell will ring each time the ball hits any of these points.
Other behavior noted.
* If the target light "Yellow Bumpers" is lite and the ball gets captured the Yellow Bumpers will light.
* If the target light "Green Bumpers" is lite and the ball gets captured the Green and Purple Bumper will light.
I would expect the correct behavior for the Advance Target Lites is that the target lights advances only after a ball has been captured.
I'm pretty new to EM pinball machines so I'm a bit unsure where to start on this issue. But I think the repair history on this machine may be relevant.
When I acquired the machine the advance target light was stuck at the top at 500 and none of the bumpers would light up.
Which of course make sense if the advance target isn't advancing.
When I bought the machine is had a very loud hum. One of the coils the Lock Relay looked bad so I read up on how to test it and I determined it was bad. I replaced it. I had hoped replacing that would fix the Advance Target issue but it didn't.
After reading the previous discussion on Doodle Bug about the Advance Target Lite Not working
I realized the Coil in the Match-Unit in the head was totally not connected. I check that coil and it was bad. Given the nature of EM machines that you can still move the advance on the match-unit I did play with it back then and I observed the following behavior
* If the target light "Yellow Bumpers" was lite and the ball gets captured the Yellow Bumpers will light.
* If the target light "Green Bumpers" was lite and the ball gets captured the Green Bumpers will light.
I was never ever able to get Purple Bumper to light. So I find it strange that the with the Coil connect now they both light the first time the ball is captured there.
Again I'm not sure where to start on this so any suggestions would be greatly appreciated. I've downloaded the schematics for the machine from the web but I've never really have tried to read schemas before so this is going to be a learning exercise for me. Which is good because that's why I bought an older machine. I wanted to learn how to fix it.
One question, to make sure I didn't solder on the coil wires backwards. As my coil wasn't connected I just used the picture from the previous Advance Bonus Light Not working discussion to help me figure out where to solder the disconnected wires in my head unit to the coil. I just want to confirm that soldered them in the correct spot. I'm not even sure whether it matters but I'd like to rule that out first.
I also replaced the springs on the Match-Unit using a spring kit from The Pinball Resource in case that's part of the problem here and that I need to do some adjustment as a result of replacing the springs.