I have a 1976 Gottlieb Volley that I have thoroughly cleaned and checked all the switches and relays. All the factory wiring is intact. I have the schematic and attempted to solve the problems with the game before I resorted to making this post. Most EM issues I can solve but two things that are happening in this game have got me stumped.
1) The tens reel operates correctly when 10 points are scored (there are 9 ten points switches on the playfield), either from the switches or by actuating the ten point relay by hand. All the reels will reset to zero, except the tens...the coil is stuck on after it makes one pull. But I know the 0-9 switches are set correctly and the reel works correctly once the reel is at zero, so the contact (EOS switch) that shuts off the coil is working. Some switch or path that allows the other 3 reels to reset is obviously not working for the tens reel. Of course when the ten is locked (energized) the score motor keeps turning. If I power on & off the game, then the coil releases and the reel increments each step with each power cycle until zero and then it stops energizing the coil. What is probably causing the tens coil not to go to zero when all the other coils do? I have cleaned and checked the operation of the switches for the zero, 1-8 position, and 9 and they are all correct, so it must be a signal from another source that is dropping out before the ten resets to zero? The AX relay gaps and switches are all clean and it appears to function correctly. If all the other reels (except tens) are at numbers besides zero they all reset to zero when the game is started.
2) Any time 100 points is scored the hundreds reel works correctly, but the ball count unit advances, so after 500 more points the game is over because each 100 points advances the ball count unit one step. I have studied the schematic until I'm dizzy and I cannot understand how the 100 points relay is moving the ball count unit. Volley seems a bit different from most wedgeheads that I have worked on because it has 2 switches on the trough instead of the usual 1 switch that advances the ball count unit. As I read from the schematic the extra trough switch is to accommodate the differences between the game set on 5 or 3 ball play, but I cannot see how the 100 relay is causing current to go to the ball count solenoid. This problem of 100 points advancing the ball count occurs in either 3 or 5 ball setting, based on the connector under the playfield. To add to this situation, when the trough switches close the 100 point relay is activated and the 100 reel advances one step. So this issue with the 100 points and the ball count unit is a two-way street.
If anyone has encountered similar issues and knows where the faults are I sure would appreciate your help and knowledge. The sticking 10s coil is probably common to any 70s Gottlieb, but the 100 points causing the ball count to move may be something unique to Volley? All the score motor switches are clean, gapped and open-close as they should. I especially made sure the 1A switches are good. I can take and attach photos as required.