Black knight locked up

joe2012

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I replaced a 2N2166 transistor on Driver board. I hated removing all 18 connectors because I feared there my be a connection problem when I remount the CPU and driver board. Well there was. Game went into a lock up mode. It shows (2500 4) in player one display, (04) in the credits and (00) in the ball in play.
I removed all 18 connectors, and the CPU/Driver board one more time. I reflowed all the headers around the outside and all the center pins that separates the CPU and Driver. Still is in lock up mode. How do I get this out of the service mode?
 
What happens if you turn if off and turn it on real quick? You might need to do it a few times by flicking the power switch on and off.
 
What happens if you turn if off and turn it on real quick? You might need to do it a few times by flicking the power switch on and off.

It shows (2) 00's in player one display and (2) 00's in credit and (2) 00's in ball in play. All displays alternate to the factory high score, 2,500,000.
 
You've got dead batteries on the cpu board. When you replace them you will need to reprogram a few adjustment in the software menu.
 
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