super sprint vertical sync won't stop scrolling

robotype

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Sep 14, 2006
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milano, Milano, Italy
just got a brand new dual frequency chassis for super sprint, I tested the new chassis with normal 15KHz games and it works correctly. put it in the game and syncs to 25KHz but it's impossible to stop vertical scrolling, I can slow it down but just won't hold it. I also see some horizontal lines. so I tested the old chassis and does the same thing! I think now I have a problem on the video board of the game...what can I check? I also tried to connect the comp sync (p19-6) which is usually not used but won't help.
 
This sounds to me like the pot is bad, that thing that you are adjusting or you may need to add a resistor to aid in the adjusting.
 
This sounds to me like the pot is bad, that thing that you are adjusting or you may need to add a resistor to aid in the adjusting.

the v.sync pot? I am using three different chassis on this game, monitor is not guilty.
I think the problem is on the game video board...
 
invite Buffett or modesit to weigh in on this issue. I don't think this is a pcb issue, if it is I still don't believe it. It is very possible but really don't see it.

Pm sent to Buffett.
 
i am not familiar with that monitor.

or the synk that the board puts out

take a pic of the input header.
is it a row of pins or a 15 pin D-sub

i would use composite negative sync combine the sync if it has two separate signals

or

use both composite sync pins if it is a single row header and it has two separate sync wires.
you may have to swap the sync wires if it has two coming from the board if you are using two pins.

and if that does not work then repeat the process for the positive sync terminals.

hope this makes sense.

Peace
Buffett
 
I did all sorts of experiments with H and v sync and the composite sync but I couldn't get a still picture.

this is one of the monitors I am using, it's italian...is what they made after hantarex polo.

https://dl.dropbox.com/u/42991605/sivid_SL1100/IMG_3380.JPG

It really doesn't look like a game pcb problem but the facts that leads me to think this is not a monitor issue is that I am testing three different chassis that didn't have this sync problem and now they all do. they can't hold the sync in the exact same way.

Lately I have been messing with monitors in this game so I'm afraid I have damaged something on the video output of the pcb but being a system 2 is not very practical to bench test it...
 
yea i am not familiar with that chassis at all.

never seen one in person and am not a big fan of tri/multisync monitors.

sorry i cannot be of any help on this one.

but there are others here on the forum that can help.

Peace
Buffett
 
i do not know and have never had to convert a game from one Khz to the other

i do not know the native resolution that super sprint puts out.

Peace
Buffett
 
too soon to claim victory! I am now dealing with a new problem.
after a few minutes the picture starts to vibrate and then it will stabilize but off-resolution, with very visible pixels.

IMG_1004.jpg

IMG_1001.jpg
 
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