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(Topic ID: 123214)

Restoring a Nine Ball

By aKa

9 years ago


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stn-a382-1.jpg
Big_coil.jpg
Test_switch.png
Coin_door_block.png
Multimeter.jpg
Right flipper assembly.jpg
Left flipper assembly.jpg
fuse_breaker.jpg
Flipper assemblies placement.jpg
Right slingshot switches.jpg
Left slingshot switches.jpg
Flippers assemblies wiring.jpg
Side_rails_pressure.jpg
stn_assembly.jpg
277715-i.jpg
Left_flipper_in_up_position.jpg

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#38 9 years ago
 
AMS

barakandl

nvram.weebly.com

12y 132K 10,414

OP
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.

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#40 9 years ago
 
AMS

barakandl

nvram.weebly.com

12y 132K 10,414

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.

Andrew

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#42 9 years ago
 
AMS

barakandl

nvram.weebly.com

12y 132K 10,414

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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