<div class="bbWrapper">Hi Everyone,<br />
<br />
Had my two MAME cabs fired up a fair bit over the hols. Both are based on MAMEd PCs and J-Pacs. While I've had them on for hours on end previously with no issues, the J-Pacs on both of them are now periodically losing sync. The time it takes for this to happen is fairly random, and the effect varies. Could be, they'll last for 2 or 3 hours with no probs at all, and sometimes it's just the Frontend screen that gets lost, with the games themselves syncing up OK.<br />
<br />
I've read elsewhere on the web that this might be a voltage issue. And right enough, I have mucked about with the USB ports and the stuff plugged into them over the past couple of months. <br />
<br />
I was wondering though, if it would be possible to use a Y connector to link the J-Pac and PC with a separate USB power adapter? Or would that risk shorting or blowing components?<br />
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Any advice welcome...</div>
<div class="bbWrapper">What do you mean by 'losing sync'? Are you talking about the monitor / video signal? <br />
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If so, how are you making your video 15khz...ArcadeVGA or Soft15khz or similar?</div>
<div class="bbWrapper">Hi Minwah,<br />
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I mean that the image stops being stable and starts to roll as if the vertical and or horizontal synch pots have been twiddled - which they haven't. I've tried adjusting the pots when this happens, but nothing happens<br />
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I'm using software solutions for both. One is Soft15Khz. Pretty sure the other is on CRT emu-driver.</div>
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Hi Minwah,<br />
I mean that the image stops being stable and starts to roll as if the vertical and or horizontal synch pots have been twiddled - which they haven't. I've tried adjusting the pots when this happens, but nothing happens
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It sounds a bit like the v-hold, but if you've tried that...<br />
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Does your JPAC have the sync led's on it?<br />
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I think to rule out the power problem I would get a powered USB hub to go between PC and JPAC, and don't plug anything else into it.</div>
<div class="bbWrapper">A powered USB hub. I didn't realise there was such a thing! Sounds ideal though. I'll give it a try.<br />
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Cheers<br />
<br />
PS. When the frequency goes haywire, so do the sync LEDs on the jpacs.</div>
