Monitor sync problem on conversion

kelleyphd

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Hi All,

I have a Quarterback that I am converting and I am having trouble with the monitor hookup. It is a WG K5501. The monitor chassis has the 6+3 connector configuration and was originally hooked up with RGB on pins 1-3 on the 6-connector and a ground and two syncs on the 3 connector. Randy Fromm's book says use 1-4 on the 6-pin (moving the ground to pin 4). and then only pin 3 for the H sync. I also tried hooking the sync to both pins 2-3 as recommended in Randy's book and jumping the ground to pins 4 of the 6-connector and pin 1 of the 3-connector. I am hooking up a JAMMA harness and I am not getting much of a picture. I know that the board that I am trying is good and the monitor is good as it just ran the Quarterback.

Am I missing something?

Thanks
Daniel
 

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Well, what board are you trying to run in it now? Does adjusting the horizontal or vertical hold pots do anything?

Yes, if you are using a JAMMA board (negative composite sync), then you'd normally hook it up like this

10 - sync
9 - empty
8 - empty
7 - empty
6 - empty
5 - empty
4 - ground
3 - blue
2 - green
1 - red

Now, ground can be used on pin 8 also, like what you currently have. Sometimes you see this issue when there is an improper ground, so you may try moving the ground to pin 4. If your current wiring has sync going to pin 9, you can try removing it (sometimes it doesn't matter if it's there). If you don't, you can try adding it to see if it helps.

You should check to make sure that the video header pins on the 5501 don't have cold solder on them. If you spliced a connector on rather than make a new one for your JAMMA harness, do continuity checks between the edge connector and the monitor connector to make sure there isn't a break somewhere....
 
Well, what board are you trying to run in it now? Does adjusting the horizontal or vertical hold pots do anything?

Yes, if you are using a JAMMA board (negative composite sync), then you'd normally hook it up like this

10 - sync
9 - empty
8 - empty
7 - empty
6 - empty
5 - empty
4 - ground
3 - blue
2 - green
1 - red

Now, ground can be used on pin 8 also, like what you currently have. Sometimes you see this issue when there is an improper ground, so you may try moving the ground to pin 4. If your current wiring has sync going to pin 9, you can try removing it (sometimes it doesn't matter if it's there). If you don't, you can try adding it to see if it helps.

You should check to make sure that the video header pins on the 5501 don't have cold solder on them. If you spliced a connector on rather than make a new one for your JAMMA harness, do continuity checks between the edge connector and the monitor connector to make sure there isn't a break somewhere....


Thanks for the help. It ended up being the pots. I just assumed since the original game was adjusted fine that it would be closer than that. Lesson learned.

Daniel
 
Thanks for the help. It ended up being the pots. I just assumed since the original game was adjusted fine that it would be closer than that. Lesson learned.

Daniel

A common mistake. Different game programmers created slightly different sync stability characteristics, and it's not uncommon to need to adjust a perfectly good working monitor when switching boards. I don't know if the differences are due to the programming, or due to differences in board architecture (different processors or whatnot) for each game requirement...
 
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