Professional software development, amateur BMW tinkering, old arcade game stuff


Konami Track And Field arcade pcb repair #4

Another Track & Field..  no video output, but a logic probe on the CPU seemed to show it was running without the watchdog reset firing.  With no video monitor sync is the first thing to check, and although this later revision of the pcb doesn’t match any available schematics sync is easy to find as it still terminates at the 470/100ohm resistors as seen on the regular board.

Tracing back from that point quickly found a Fujitsu LS74 chip @ 11G with dead outputs.  Replacing this fixed monitor sync and everything was correct.





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