I have bought a Gottlieb Close encounters of the third kind.
After al long time of searching I found out both the driver board and power supply were shot. Displays didn't go on and coils were burned.
I ordered 2 new boards from rottendog and placed them last week. After that is still have a few problems with 2 coils that is need to replace.
But there are 3 main problems:
Sound, there is no sound, only one long loud buzz... Driver board is replaced so that can't be the problem.
Roto target, doesn't spin. Records hits, does count them but no spin. I think the transistor under the playing field is blown, am I thinking in the right direction?
The biggest problem, I can't play... Well sometimes it plays...
At first I could play once. After game over I press the credit button again and nothing happens.
At first I thought the credit button was broken. But power off, power on, and when I go in test procedure the button works. I can set high score levels with the button so no problem there.
I found out one oddity, when I start up, I can go into test mode with the white switch, but once I press the credit button everything freezes and I can't go into test mode. Only the high score and 0000000 are shown on the displays after each other.
Then I thought the Mpu board fails but the game boots normally, 5 sec boot delay and displays go on.
In test mode I can set everything, high score levels, reset all the other diagnostics with the reset button on the Mpu, so I think the Mpu is ok.
So where do I have look for problems?
And sometimes when I start up the game after a long time it normally stars and I can play one or 2 games. I suspected the battery, but it gives 4,0v ( yes it is replaced and no corrosion).
Please help me?