The left jet bumper and the right slingshot are now repaired and working.

I removed the power driver board and replaced all the components for the right slingshot.
Testing showed that it now works as it should.

Another problem is that the game sometimes ejects extra balls when playing.
It seems not to happen when shooting the balls “normally”, when just hitting random targets without locking a ball.
Switch matrix seems to be working and are registering all balls correctly in the ball trough.
I removed the two opto boards in the ball trough and looked for bad solder joints, but it looks ok visually.
Testing of the ball trough showed no issues, even when fiddling with the wires.

Further troubleshooting revealed that it only happens when locking ball #2.
When ball #2 enters the idol, the previously locked ball were released to the playfield because the idol rotates to make room for ball #2.
It turned out to be the yellow plastic idol rotor lock that had broken off, which should prevent the ball from going back to the playfield at this time.

I placed an order from the guys at free-play.se so it should arrive within a week.
Thanks Simon! 🙂

This should be the solution for the several ball issue.
But i can only be sure when it is replaced and tested of course… 🙂

This machine i repaired for about 1.5 years ago came back with some new faults that had appeared.

This time the left jet bumper and the right slingshot had stopped working.

The left jet bumper coil had a wire that were no longer connected due to vibrations.
Soldering it back on solved that issue.

The right slingshot coil was fried and were replaced with a new one.
Further troubleshooting showed that the TIP102 transistor controlling this coil on the driver board had burned.

I have now started replacing all the components in that circuit. (Total of 7 components)

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.