Galaga Problem

Galaga007

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Any suggestions would be appreciated. On my Galaga, when I put in one quarter, two games will coin up. The rankings for game setting difficulty are not appearing correctly either. For example: If I set the ranking to C, A will appear on the monitor. If I set the ranking to B, D will appear. Thank you for any anticipated help.
 
Any suggestions would be appreciated. On my Galaga, when I put in one quarter, two games will coin up. The rankings for game setting difficulty are not appearing correctly either. For example: If I set the ranking to C, A will appear on the monitor. If I set the ranking to B, D will appear. Thank you for any anticipated help.

flip the dip switches off and on a few time for each one or maybe just replace. Look at traces coming from the dipswitches?
 
Check the dip switches with a multimeter... and check the 4.7k resistor packs next to the dip switches for broken connections. They should read 4.7k ohms from each pin back to the common pin that is connected to +5v.

RJ
 
I think the problem may be even more simple.... sometimes the dip switch bank is put in the board upside down. That means the switches may be numbered in reverse. Make sure you are flipping the correct switch position by checking to see where switch one is represented in the manual and go from there....
 
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