Build Your Own Arcade Controls Forum
Main => Monitor/Video Forum => Topic started by: spun10th on September 29, 2006, 11:31:25 am
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Hi everyone, attached is a PDF of the schematic for the Jen Shinn 25" chassis from 8liners. The original was reportedly one very large sheet so the document was scanned in 4 pieces.
I am trying to figure out if the compatibility problems with the ActLabs lightgun are due to similar reason as the W-G D9200. According to Andy Warne, this was due to the input boards loading the sync signals too much causing the level to drop below that needed for the gun to work.
I have provided him a copy of the schematic but if anyone else knows how to verify this via the schematic, your time would be greatly appreciated. Thanks all.
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Oh no- a fax! Too hard to read---not good enough resolution. Couldn't they have gone too Kinko's and used their large format copier and sent that in the snail mail instead?
What's with the "Sharp Image" markings on the document?
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Ken,
That's what I was thinking too, I guess they didn't want to spend the time make a real copy. Victor wasn;t in today so maybe on Monday I can get him to make a real copy of it.
Not sure that the Sharp Image notations are...
Andy responded back to me and verified that the H and V signals are loaded to a resistance which is lower than most monitors. Here's a c/p of his repsonse:
"It is difficult to follow was the H and V sync signals go off the page but I think I can see where they come back in. They are indeed loaded by lower resistances than other monitors, in fact there is a potential divider on the sync lines.
It would be possible to experiment with changing this but would mean messing about with the monitor. What you could try is connecting 10K ohm resistors in series with the H and V sync wires into the monitor. This might prevent the signal from being loaded so much."
I'm not sure where he's saying to add the resistors as there is only a composite sync going into the monitor. Maybe he's talking about adding the resistors at some point after the video inputs enter the chassis... Any thoughts, Ken? Thanks.
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Or maybe I should just add one resistor to the composite sync coming into the chassis from the J-pac??