THIS IS A REPRODUCTION PROJECT MADE BY @caius ALL INFORMATION HAS BEEN POSTED WITH HIS PERMISION. CREDIT AND MERIT GOES TO HIM.
Have you ever encountered the following scenario on your beloved arcade PCBs?
Probably sometimes.The cracked component is silkscreened ‘051550’, maybe now the name tells you something :
It’s a custom IC in SIL package that can be found on countless boards manufactured by Konami (from mid 80s to late 90s).Here’s the pinout taken from a TMNT schematics:
As you can see, it performs two functions :
In the below scan of the “naked” component I have highlighted the part of circuit that handles the coin counters.The other part is the /RESET generation circuit which is built around a power supply monitor IC like the Fujitsu MB3773 :
You can read its datasheet here:
http://www.jammarcade.net/files/Datasheets/MB3773.pdf
In this project I took into account only the /RESET function since it’s the most important and vital, coin counters can be now considered obsolete hence I intentionally omitted the relevant circuit.Anyway, for my repro I wanted to keep the dimensions of the original part:
Here’s final testing on a Lethal Enforcers PCB:
See you all to my next reproduction project!
Have you ever encountered the following scenario on your beloved arcade PCBs?
Probably sometimes.The cracked component is silkscreened ‘051550’, maybe now the name tells you something :
It’s a custom IC in SIL package that can be found on countless boards manufactured by Konami (from mid 80s to late 90s).Here’s the pinout taken from a TMNT schematics:
As you can see, it performs two functions :
- master /RESET generation for the whole system and watchdog timer
- coin counters handling
In the below scan of the “naked” component I have highlighted the part of circuit that handles the coin counters.The other part is the /RESET generation circuit which is built around a power supply monitor IC like the Fujitsu MB3773 :
You can read its datasheet here:
http://www.jammarcade.net/files/Datasheets/MB3773.pdf
In this project I took into account only the /RESET function since it’s the most important and vital, coin counters can be now considered obsolete hence I intentionally omitted the relevant circuit.Anyway, for my repro I wanted to keep the dimensions of the original part:
Here’s final testing on a Lethal Enforcers PCB:
See you all to my next reproduction project!