Centuri/Amstar Phoenix arcade pcb repair
Certain graphics had corruption – usually solid lines through certain sprites or frames of animation. As the issue was specific to certain frames I was fairly sure it would be a ROM problem, as a RAM or TTL problem would most likely affect all graphics. ROMs H2 and H3 hold the sprites and although H2 was in perfect condition like the rest of the board, it contained some corrupt data. A replacement was fitted an everything was fine (a 27c32 was used as I didn’t have any 2716′s – this is fine if you burn the ROM data to both the upper and lower half).