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NBA JAM: T.E.
battletoads:
Hey I just got a NBA Jam Tournament Edition PCB off of EBay, complete with the sound card and sound pot. I hooked it all up and swtiched it on, and the screen sort of jumps, moving down past the bottom of the monitor and then coming from the top again. I can see the game do a rom test, and every rom works fine.
Im honestly stumped as to what could be doing this, if you check ym apst posts youll see that im working with a Jamma cabinet that worked fine with TMNT, X-men, and Battletoads. Maybe this is a video or power issue? I disconnected the sound card and the problem is still occuring. It reminds me of when you try to play a PAL dvd player on a NTSC tv the way the image jumps, however there is no color distortion.
I know that there is no +5 or -5 or whatever wire running from my Jamma harness to my power source, could that be the problem? Thanks, I appreciate it.
RayB:
You're funny. Adjust your V-Hold knob.
battletoads:
OK. Well after looking up exactly what that is, ill have to take a look at the monitor, because my CP is custom and defiently wont have a knob on it. This was originally a Gauntlet 2 cabinet. Should the knob be on the monitor or one of the PCBs? Thanks man.
srabelpawz:
the knob will be on the monitor board or a remote board coming from the monitor. i suggest you read up on monitors a little bit before reaching your hand in there because it will have to be on in order to adjust it. BTW the monitors have a charge that could make you pee yourself ;D
battletoads:
hmm ok. do you have a guide on handling monitors, like gloves to wear or precautions to take? I have the build your own arcade book but i dont remember it being discussed in depth in there.
I guess turning this knob will change the monitor to a frequency that supports this individual pcb or something, because 3 other games operated just fine. Thanks