1982 Bally Eight Ball Deluxe LE
Alltek MPU, all other boards original, SDB and Sound Board recapped by previous owner
Condition: Played completely when I picked it up. Everything worked when initially set up (after minor fixed mentioned Below)
After 2 hour trip home and first few games in my gameroom, a pop bumper and lead for upper left flipper broke. I soldered them and everything worked fine for about another 10games.
Played perfectly for a few days and then while it was on, it got stuck with background sound and only 3 feature lamps and GI on, and when I looked at the Altek MPU, the over voltage indicator was on. Here is what happens during a boot:
1) All boot sequences finish, no over voltage light is on
2) The displays flash for a split second and the coin door lock out coil pulls
3) The game is stuck with the left orbit feature lamps on and background sound. Also, the red test button on the coin door does not work.
4) The over voltage indicator is on (Altek MPU)
What I did next:
1) Unplugged all connectors going out of the rectifier board and tested voltage at all TPs on the rectifier board. All measured as expected except TP3 which measured ~56VDC.
2) Measured voltage at pin 3 and 6 on J6 from the transformer ~14VAC. All other pins also measured the correct incoming AC voltage
3) Took known good rectifier board from Flash Gordon and installed it in EBDLE and connected J5 and J6. TP3 still measured ~56VDC
Also, with just J6 plugged in the voltage at TP3 is ~26VDC. With J5 and J6 it is ~56VDC
Observation prior to issue:
I noticed that the coin door lockout coil would activate prior to the audio attract. The very last thing that happened before the issue began was activation of the coin door lockout coil and then a pause for a few seconds and then just background music and the feature lamps on the left orbit (to top lane) shot.