Pole Position lines on screen when race

bigaw

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pole position lines on screen when qualifing or race.picture of complete circle of track and top scores are clear. would this be a board or chip problem. Thanks.
 
pole position lines on screen when qualifing or race.picture of complete circle of track and top scores are clear. would this be a board or chip problem. Thanks.

post a pic or two of the symptoms.

first suggestions:

check the power supply voltages at the test points on the boards. if below 4.8v then thats likely the problem - need to adjust the 5v to between 4.9v and 5.1v.

also, check that all connections from the power supply including grounds and the big blue cap connectiions, edge connectors etc are all cleaned up.

i have also seen issues with lines on the screen (like fence posts near the car wheels) caused by a power supply with insufficient current rating (ie 5v rail on switcher was only 15amp whereas a 5v 25 amp switcher fixed the problem.)
 
pole position

the pictures of pole position with track and high scores are clear in person.but you can see the lines in picture with car on track very small lines across screen not to bad when first turn on. seem to get worse when playing game.connections look good.
 

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Contact details of repairer for PP boards...

this thread has contact for Dick Milligan, in case you need it..
http://forums.arcade-museum.com/showthread.php?t=125696&highlight=pole+position

i recently saw a PP repair thread talking about multiple wide red lines (wide banding) on the screen - it may be relevant. just cant seem to find it darnit - must have deleted the subscription gosh darnit ! IIRC there was i think a suggestion about the monitor itself being responsible for the banding .. can anyone find that thread ?
 
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Looks like multiple issues... looks like the road's only drawing alternate lines... hard to tell if the white lines are a humbar on an actual problem.
 
... looks like the road's only drawing alternate lines... .

yet it doesnt seem to be a problem in the first or third pics. could be the camera was set to high speed and only captured one half of one interlaced frame ? (a luck shot if thats the case!)

question 4 bigaw - is what you see the same as what the pic shows ?

do you have another monitor you can try on the pp to eliminate the monitor as a source of problems ?
 
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pics question

OK in person the circle track with pole position is clear 1st pic.when it shows high scores picture is clear3rd pic.but when it goes to race track with car Game Over 2nd pic it has real fine lines across picture pic not to good sorry. but if you look at pic you can see real fine lines light.dark.light.dark the bigger white lines must be camera. this is brand new monitor.old one had burn in and lines also was hoping would cure lines but didnt.
 
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