G07 and Track and Field

jgeiger

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Saw a few other posts that made reference to this combo and how to handle the negative sync. Sort of makes sense but I still must not be getting something. I rebuilt a G07 and it looks nice and sharp but I cannot get the horizontal or vertical scrolling locked in. At best I get the horizontal somewhat stable but not centered and the vert just down to a slow crawl.

Attached is a photo of the connection to the chassis as best as I could make out from the other posts. Its RGBG from right to left (looking down at it) and the composite sync in the first two slots from the right on the other connector.

Im about to replace the pots from another donor chassis so hopefully that might fix it but I would really like some input on the connections. Originally, it was RGBS-G on the main connector and just S on the first right connector when it was connected to a cortek monitor. After switching it theres no difference.

Thanks.
 

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Replaced the pots from the another chasis and things got worse. Going to order a pot kit from Bob this week. Also, connected it after the pot switch and to a Wizard of Wor with same results so thinking the pots are now a prob.
 
Saw a few other posts that made reference to this combo and how to handle the negative sync. Sort of makes sense but I still must not be getting something. I rebuilt a G07 and it looks nice and sharp but I cannot get the horizontal or vertical scrolling locked in. At best I get the horizontal somewhat stable but not centered and the vert just down to a slow crawl.

Attached is a photo of the connection to the chassis as best as I could make out from the other posts. Its RGBG from right to left (looking down at it) and the composite sync in the first two slots from the right on the other connector.

Im about to replace the pots from another donor chassis so hopefully that might fix it but I would really like some input on the connections. Originally, it was RGBS-G on the main connector and just S on the first right connector when it was connected to a cortek monitor. After switching it theres no difference.

Thanks.

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If this picture is how you've still got it hooked up, you'll never sync like that. Your 3 pin header has video ground on the right most pin, and the negative sync pins are the two on the left. You need to move your wires over .
 
For future reference, the connections on the G07 are:

Top 3 pin header, from left to right, viewed from above:

1. Negative Horizontal Sync (use this pin for composite sync)
2. Negative Vertical Sync
3. Video Ground

6 pin header, from left to right, viewed from above:

1. Positive horizontal sync
2. Positive vertical sync
3. Video Ground
4. Blue
5. Green
6. Red
 
Thanks for the info. I moved the pins over and got no picture at all. Then (since its composite) put just the left pin on the 3-pin header and still no picture. The only way it gets picture is if the right most pin has a sync on it. Do you think I need to move the ground from the 5-pin to the 3-pin?

Thanks again.
 
Update on this. Just fixed a different G07 and same problems. Tried having the negative sync on the left two pins of the three pin connector and no picture.

Anyone else get this to work?

One thing is that there is only one sync wire coming from the T&F that is duplicated when it hits the connector. I know there is horizontal and vertical sync but is it on one wire?
 
One thing is that there is only one sync wire coming from the T&F that is duplicated when it hits the connector. I know there is horizontal and vertical sync but is it on one wire?

Correct. The one wire coming from the board is a composite of both H and V syncs. It should be jumped together at the connector.
 
Thanks for the info. Also read through the stuff on BR's page.

So, I connected it the way it is supposed to be (to the best of my knowledge). RGB and Ground are on the 6 pin connector from right to left. The sync is on the left two pins of the 3 pin connector. At this point I get a ghosted or inverted image with no color and still have some scrolling issues. Im going to double check the monitor on another machine but last I checked it was nice and clear.

Attached is a pic of the connection. Ill trace back the wires and make sure everything is making contact.
 

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Ok, messed around a little more. With the config above I get good color and picture just a slow vert and horiz roll. As much as I adjust the pots on the back I just cant get it to stabilize.
 
You need to tie the sync wire coming from the board into both wires (H and V) on the sync molex connector!
 
Yeah, what you cannot see is that between the board and that connector there is another molex that duplicates the single sync wire into the two that you see on the connector. Added a pic. Ive seen loops before on the connector but in effect it should be the same line.

Thanks though.
 

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Alright, some more details.

Re crimped the connectors that go to the chassis.
Reflowed the solder on both sets of pins on the chassis
I cannot get a picture unless one of the sync wires is on the right most pin (from the fly).
I connected the sync to both of the other pins (so to all three) and get a nice clear picture but no sync.

I tried to put a different G07 on T&F when I started this thread and it seems like the same exact results no matter the configuration. So, Im ruling out the monitor at this point.

Any other ideas? Unfortunately, I have a few G07's and nothing else at the moment to get T&F up and running.

Thanks.
 
Have you checked resistors R314 and R317 against the schematic? Some came from the factory with the incorrect resistors.

They both should be 390 ohms but many chassis had 4.7 K's put in by mistake.

The reason you wouldn't see a problem until now is because these resistors are part of the negative sync circuit. If this monitor was in a game with positive sync you wouldn't notice a problem.
 
Thanks for that info. I was able to confirm that 314 and 317 were not the correct ohm resisters. They were 4.7 instead of 390. I replaced them an no change unfortunately. I also checked 312, 313, 315, and 316 just to make sure since they are on they seemed to be part of that circuit. They were as expected and just fine.

With the exception of 314 and 317 I probably will not look any further into the negative sync circuit just because this has happened on two separate G07 chassis.

So, before I finally give up on this, any other suggestions?

Thanks for everyones help thus far.
 
Shit, you nailed it. I thought I had traced everything back correctly. Turns out the connector between the monitor connection and the board had the syn and ground crossed. Straightened them out and it synced perfectly. Looks great.

Man, what a time sink. I did learn a lot though about the monitor.

Thanks for all your help.
 
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