Galaga - problems setting Rank D

I've got an original Galaga board that I've set the dip switches to Rank D
(Dip Switch 6J, SW2=On, SW3=Off) but the game shows it's set to Rank C. I
can only get the game to show Rank A or Rank C. Basically SW2 is always
stuck at Off no matter if the dip switch is set to on or off. I've used my
DMM to verify SW2 is working properly. I also verified the trace going from
SW2 to pin 3 of the 74LS151 at 4K is good per the schematics.

All the other dip switches at 6J are working fine along with all the dip
switches at 6K. Any ideas what could be going on here? Could the 74LS151 at
4K be bad?

The weird thing is another person local to me had a Galaga board that was
doing the exact same thing as this one. Not sure if this is a common
problem or what.

Any help would be appreciated. Thanks.

Rodney

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Received on Wed Nov 3 13:49:04 2010