SNK vs. CAPCOM crashing after boot
Posted: Sat Jul 07, 2012 11:49 pm
Hello!
Me and a few friends recently purchased a NAOMI 1 cab at auction with SNK vs. CAPCOM game. We're new to arcade cabinets in general, but we've done some research to get us somewhat knowledgeable. My roommate is an electrical engineer so we are prepared to do anything to get it working.
When we first got the unit we moved it in to our living room, and there was a few problems we identified:
1) two of Player One's buttons didn't work
2) The screen was cut off at the top & bottom edges, as in, the countdown timer for each round of SNK vs. CAPCOM was not visible on-screen, and the power bars for each character at the bottom were also slightly cut-off.
3) Sometimes the game would load the NAOMI splash screen, get to the international warning (red text on black screen) and then fail to load.
My roommate fixed problem 1 by resoldering the ground wires connecting to the buttons, we're still not sure what's causing problem 2. After my roommate fixed the buttons, the game seemed to work fine, but then when they moved it back into the corner of the room and turned it on again, the game would not get past the warning screen. Since then, we've managed to boot it properly only once, so it seems the boot problem has gotten significantly worse.
After searching through the forum we've attempted a couple fixes:
1) Ran ALL diagnostics accessible from the service menu, and they all pass fine.
2) Checked the voltage going into the NAOMI board and we have measured them at 3.28 V, 5.20 V, and did not read the 12. The power supply is a Mighty Power Electronic Co. MP-7150A. Unfortunately, we can't seem to find any documentation on it online. We've only found a screw to adjust the 5V output as well, and no 3V adjustment screw has been found.
4) Flipping DIP switches on the back of the NAOMI to change the monitor frequency.
5) We opened up the NAOMI board, which was kinda dusty itself, so we cleaned it out, and all the capacitors, BIOS chip, CMOS battery, and traces look fine on visible inspection.
Any advice would be appreciated on how to solve the intermittent boot problem we've been having, and I've read posts with similar issues but no solution.
EDIT: One more thing I forgot to mention, not sure if it's important, but when the game fails to boot, every so often there's this crackling or snapping sound that we hear and visibly on the monitor a point of light flashes.
Me and a few friends recently purchased a NAOMI 1 cab at auction with SNK vs. CAPCOM game. We're new to arcade cabinets in general, but we've done some research to get us somewhat knowledgeable. My roommate is an electrical engineer so we are prepared to do anything to get it working.
When we first got the unit we moved it in to our living room, and there was a few problems we identified:
1) two of Player One's buttons didn't work
2) The screen was cut off at the top & bottom edges, as in, the countdown timer for each round of SNK vs. CAPCOM was not visible on-screen, and the power bars for each character at the bottom were also slightly cut-off.
3) Sometimes the game would load the NAOMI splash screen, get to the international warning (red text on black screen) and then fail to load.
My roommate fixed problem 1 by resoldering the ground wires connecting to the buttons, we're still not sure what's causing problem 2. After my roommate fixed the buttons, the game seemed to work fine, but then when they moved it back into the corner of the room and turned it on again, the game would not get past the warning screen. Since then, we've managed to boot it properly only once, so it seems the boot problem has gotten significantly worse.
After searching through the forum we've attempted a couple fixes:
1) Ran ALL diagnostics accessible from the service menu, and they all pass fine.
2) Checked the voltage going into the NAOMI board and we have measured them at 3.28 V, 5.20 V, and did not read the 12. The power supply is a Mighty Power Electronic Co. MP-7150A. Unfortunately, we can't seem to find any documentation on it online. We've only found a screw to adjust the 5V output as well, and no 3V adjustment screw has been found.
4) Flipping DIP switches on the back of the NAOMI to change the monitor frequency.
5) We opened up the NAOMI board, which was kinda dusty itself, so we cleaned it out, and all the capacitors, BIOS chip, CMOS battery, and traces look fine on visible inspection.
Any advice would be appreciated on how to solve the intermittent boot problem we've been having, and I've read posts with similar issues but no solution.
EDIT: One more thing I forgot to mention, not sure if it's important, but when the game fails to boot, every so often there's this crackling or snapping sound that we hear and visibly on the monitor a point of light flashes.