Archived from groups: rec.games.video.arcade.collecting (More info?)
I have a Road Blasters upright that I just recently aquired that has a
video issue. Just a little bit of a back story, this unit was on
location last summer until the monitor quit working where it was stuck
at the back of the guy's warehouse and left. Fast forward to last week
when I brought this thing home. I cracked open the cabinet to find the
focus wire coming from the flyback ot the neckboard had shorted to the
v-pos wire on the monitor chassis (this is a K4900 BTW). I tossed in a
known good K4900 chassis to bring the monitor back to life, but all
I'm getting now on the screen is a scrambled image. the image is
mostly white, but you can see colour in the scrambled area at the top.
The game plays blind, and you can see changes in the screen as the
game does it's thing. Does anyone have any idea what could be wrong
with this, or how I can test it a little farther? I was thinking of
replacing the LS368 hex inverter that drives the sync output to see if
that makes any difference, but I'm really just shooting in the dark. I
have eliminated the game cart as the source of the problem as I have
tested it on another System 1 Main board that I have here amd it works
fine.
Does anyone have any suggestions on how to proceed with this? I
haven't had any luck finding test procedures on the 'net, but I do
have the schematics for the board.
Thanks!
James
I have a Road Blasters upright that I just recently aquired that has a
video issue. Just a little bit of a back story, this unit was on
location last summer until the monitor quit working where it was stuck
at the back of the guy's warehouse and left. Fast forward to last week
when I brought this thing home. I cracked open the cabinet to find the
focus wire coming from the flyback ot the neckboard had shorted to the
v-pos wire on the monitor chassis (this is a K4900 BTW). I tossed in a
known good K4900 chassis to bring the monitor back to life, but all
I'm getting now on the screen is a scrambled image. the image is
mostly white, but you can see colour in the scrambled area at the top.
The game plays blind, and you can see changes in the screen as the
game does it's thing. Does anyone have any idea what could be wrong
with this, or how I can test it a little farther? I was thinking of
replacing the LS368 hex inverter that drives the sync output to see if
that makes any difference, but I'm really just shooting in the dark. I
have eliminated the game cart as the source of the problem as I have
tested it on another System 1 Main board that I have here amd it works
fine.
Does anyone have any suggestions on how to proceed with this? I
haven't had any luck finding test procedures on the 'net, but I do
have the schematics for the board.
Thanks!
James
vnl71d96gv18roghjld1eia1nbmpjq3mb@4ax.com...
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