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(Topic ID: 123214)

Restoring a Nine Ball

By aKa

5 years ago

Topic Stats

  • 293 posts
  • 18 Pinsiders participating
  • Latest reply 5 years ago by Classic_Stern
  • Topic is favorited by 4 Pinsiders


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There have been 43 images uploaded to this topic. (View topic image gallery).

Right flipper assembly.jpg
Left flipper assembly.jpg
Flipper assemblies placement.jpg
Right slingshot switches.jpg
Left slingshot switches.jpg
Flippers assemblies wiring.jpg

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#38 5 years ago
Quoted from aKa:

Curbfeeler, no need to bring you here when I can ask the local operator who cut the capacitors or the one who put the gottlieb flippers to have a look ...
The test switch while in attract mode does the same thing it does when the power cord is unplugged, which is nothing.
Some more pics for your viewing pleasure guys and girls :
Inside the beast 1.jpg (Click image to enlarge)
Inside the beast 2.jpg (Click image to enlarge)
Inside the beast 3.jpg (Click image to enlarge)
Inside the beast 4.jpg (Click image to enlarge)
Inside the beast 5.jpg (Click image to enlarge)
Yes I know it's dirty and rusty. Shame on the previous owner !

That is a cute hack to use a single 2764 eprom.

#40 5 years ago

The diag button ground return is on the driver board. The input side is on cabinet switch plug on the mpu.

Check that the ground return side of the diag button is actually at ground and not floating. Can try grounding the input pin right at the MPU and see if it enters test mode.


#42 5 years ago

take an alligator clip. Clip it on any grounded metal. Coin door, lock bar, whatever. The other side touch both solder lugs of the diag button and see if it goes into audit / test mode.

Basically i am getting at the connector plugs on the circuit boards may have a bad connection.

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