commando logic probe findings
- Thread starter stevebm1
- Start date
there is no such thing as a "scrap pcb", just ones you have not fixed yet.
usually sports games
fitted the ram chip you kindly sent me,and sadly it makes no difference,I did come across this page yesterday:
https://gurudumps.otenko.com/oldnews2019.html
,where someone fixed the very same bootleg as me,and as they mention the fujitsu chips can fail,so I am leaning towards one or several of them,time for further investigations with the logic probe me thinks
https://gurudumps.otenko.com/oldnews2019.html
,where someone fixed the very same bootleg as me,and as they mention the fujitsu chips can fail,so I am leaning towards one or several of them,time for further investigations with the logic probe me thinks
Had some time to look at this again this weekend,after replacing all the fujitsu chips on the middle board,it worked for about 10 mins,then the screen went to this:
At first I thought it was monitor related,but I tried a few other boards and my cab monitor is fine,does anyone have any idea what area of the board deals with video output?,I checked the clock with the logic probe and it’s working,and roms are being enabled,it seems to boot to this now:
At first I thought it was monitor related,but I tried a few other boards and my cab monitor is fine,does anyone have any idea what area of the board deals with video output?,I checked the clock with the logic probe and it’s working,and roms are being enabled,it seems to boot to this now:
so about the "bomb" button, you disassemble the button into 5 pieces - the black shell, the spring, the inner white section, the clear plastic cover and the coloured insert.
then use letraset to write anything you want on them.
also you can remove factory markings with very fine sandpaper
we used to do this all the time to use old buttons from fruit machines on coctail conversions.
i couldnt tell you how many of those i made up with "1 player" and "2 player" on them instead of start, hold etc.
then use letraset to write anything you want on them.
also you can remove factory markings with very fine sandpaper
we used to do this all the time to use old buttons from fruit machines on coctail conversions.
i couldnt tell you how many of those i made up with "1 player" and "2 player" on them instead of start, hold etc.
First just double check the ribbon cables between the boards as they can cause video issues since it's the second PCB that handles video.
Then there's a bunch of LS161 chips on the same schematic page as the video sync.
Check the outputs of 1K,2K,1L and 2L as they provide the H2-H255 and V2-V255 which are the vertical and horizontal syncs.
Then there's a bunch of LS161 chips on the same schematic page as the video sync.
Check the outputs of 1K,2K,1L and 2L as they provide the H2-H255 and V2-V255 which are the vertical and horizontal syncs.