I just received a Williams Blast Off game as a gift from my daughter and son-in-law (they thought it would be a good retirement project for me). The game came from an estate sale, and family members remember it working but it may have sat idle for 20 or 30 years. In any case, before I plugged it in, I checked fuses and wiring for any obvious problems. Other than cob-webs and dust, all looks good inside the body and the back field.
Coin box had been removed and a door-bell type button installed to start the game for free play. I plugged the game in, pushed the button and the play field and back field lights lit up - no smoke, no sparks, no burst of flames. I considered that a success!
Internally, there is clattering and clanking. I discovered that the Score Motor runs constantly, some relays lock in, and the Ball Count unit and circuit board are activated. I assume that the Score Motor relay is supposed to unlatch rather than run contantly and that is causing the Ball Count problem.
When the unit is powered on and the Score motor starts, the following relays are energized:
1) Coin Relay
2) Reset Relay
3) Lock Relay
4) Two other relays that are unlabeled right next to the Score Motor. There might be others, but I didn't spot any others that latched or unlatched when I powered it on.
In the back field, the relay for the Ball Count also activates, it looks like it returns to the start position but the relay continues to activate as if it were resetting.
I have the schematic for the game but, quite honestly, I'm having trouble locating the relays and tracking the wiring on the schematic. I'd appreciate any guidance on how to get this working. I'm attaching pictures of the areas I've described.