Blue Print will not boot - need guidance

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Hi,
Finally got my hands on a Blue Print PCB, wanted this ever since CAX, the game rocks......

Anyway, went over the board and replaced a few caps, fabricated a JAMMA harness for it and hooked it up.

All I get is the standard "block pattern" and it just keeps the jumble going, the game does not start.

I grounded the "reset" on J2-17 and the block pattern stops the jumble when the GND is complete and will hold until I release the connection so I know that it is "seeing" the reset.

I am going to sound all the IDC connections later tonight but until then, can anyone enlighten me to anything else that I am missing?

Thanks in advance
Jeff
 

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If you get a static pattern, check the power on reset circuit.

If the board seems to be resetting while trying to boot, check out your RAM. Not sure if all of them are like this, but the few of these boards I've seen have all the 2114s socketed. Real easy to pull them and test, or you can just replace all of them and see what happens.

Any luck getting it into test mode?
 
Hi,
I cannot get into test mode.........
Having some (limited) experience with the Bally /Midway Racks, the issue seems to be the POR circuit but does not grounding pin 17 perform the reset manually?

I will check out the replacement POR circuit schematic that I have on file and see if I am doing this correctly.

Thanks for the suggestions.
Jeff
 
Hi,
I cannot get into test mode.........
Having some (limited) experience with the Bally /Midway Racks, the issue seems to be the POR circuit but does not grounding pin 17 perform the reset manually?

I will check out the replacement POR circuit schematic that I have on file and see if I am doing this correctly.

Thanks for the suggestions.
Jeff

BTW, thank you for the reset suggestion, now that I look at the screen again, that might be the issue........

https://youtu.be/AO3bqgdIKO4

I'll look into this further.....

Thanks again
Jeff
 
Well, I think I found the problem........

I pulled all the 2114's for testing and while going over the board, although very clean, noticed some corrosion on some (what I though were) logic chips. I pulled them (X6) and lost several legs along the way.... turns out they were pretty burnt.

Looks them up and it turns out that the 74S201's are RAM IC's.....

Of course, don't have them in stock so placed an order and until then, will be pulling and replacing the RAM sockets as well.....

Thanks for steering me in the right direction, hopefully this will resolve it once completed.

I'll update when there is news...

Jeff
 

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