Hi all,
I am doing a monitor swap on my 720 and replacing the old 25k5155 with with a Neotec NT-2501.
There was a post a while back that discussed my exact situation however I am not quite understanding the proper wiring configuration from the post. http://forums.arcade-museum.com/showthread.php?t=78123
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pin 6 on the 720 video PCB, has composite video sync! The problem is that the harness has no wires running to this pin on P19 pin6. So I replaced the connector, and added the pin 6 and ran it to the monitor video connector. On the monitor I removed the horizontal and vertical Sync wires, and placed the composite sync in pin 6 of the video cable going to the monitor. Problem solved!
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So the molex end that plugs into the NT2501 from the 720 has 6 wires.
As prescribed in the previous post I am to remove h sync and v sync from both sides of the video molex; pins 1-2 (monitor end) & 7-8 on the (PCB end) - Then I am to connect to pin 6 (composite sync) on the PCB side and send it to the monitor end of the molex? This is where I am confused.
Do I send it to what would now match up as video on the NT2501 which would be #2 on the molex?
Also pin 3 on the 720 monitor side molex would now be matching to the ground pin on the NT2501 schematic. The gnd is thowing me off as well.
New at this and would greatly appreciate some guidance.
I am doing a monitor swap on my 720 and replacing the old 25k5155 with with a Neotec NT-2501.
There was a post a while back that discussed my exact situation however I am not quite understanding the proper wiring configuration from the post. http://forums.arcade-museum.com/showthread.php?t=78123
-------------------------
pin 6 on the 720 video PCB, has composite video sync! The problem is that the harness has no wires running to this pin on P19 pin6. So I replaced the connector, and added the pin 6 and ran it to the monitor video connector. On the monitor I removed the horizontal and vertical Sync wires, and placed the composite sync in pin 6 of the video cable going to the monitor. Problem solved!
-------------------------
So the molex end that plugs into the NT2501 from the 720 has 6 wires.
As prescribed in the previous post I am to remove h sync and v sync from both sides of the video molex; pins 1-2 (monitor end) & 7-8 on the (PCB end) - Then I am to connect to pin 6 (composite sync) on the PCB side and send it to the monitor end of the molex? This is where I am confused.
Do I send it to what would now match up as video on the NT2501 which would be #2 on the molex?
Also pin 3 on the 720 monitor side molex would now be matching to the ground pin on the NT2501 schematic. The gnd is thowing me off as well.
New at this and would greatly appreciate some guidance.
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