This machine is now finished and returned to the owner.

A short summary of some of the repairs :

-CPU-board : Acid damages repaired, and damaged IC:s/resistors/capacitors were replaced.
-Driver board : Two new connectors for the G.I. is mounted, and some capacitors were replaced.
-Sound board : Re-seating of all connectors restored the sound.
-Opto board ball trough : Resoldering of all resistors fixed everything wrong with this board. 🙂
-Thermistor at the line filter was replaced because the old one gave up after about 20 power-ups. 🙂
-Linkage to right slingshot were broken off, so it were replaced.
-New bulbs, new rubber and a slight cleaning.

Game now works 100% for what i can tell. 🙂

I got this Williams Indiana Jones pinball machine in for repair.
This machine has multiple problems.

It starts up, and it is possible to start a game.

But it ejects two balls every time.
(Bad optos maybe?)

There are no music whatsoever, and no soundeffects, just a random “ding” now and then.

When i tried to get into the test menu, it did not respond to any of the buttons inside the coin door.
So i measured all the cables from the buttons up to the connector on the CPU-board, and they were all ok.
Tested the buttons again, but still no response.

I then removed the CPU-board and placed it on my workbench to give it a good visual inspection.
Acid-damage had taken 6 IC:s and some resistors/capacitors…

So i removed IC:s and the battery holder, and will clean the board up before putting in sockets and changing some resistors and capacitors.

The driver board also has some damage on some connectors due to heating, and some hacking has been done previously that i have to fix.