1500points
New member
Have a 13inch G07-fb0 which came from a midway cab/pacman.
--Using the original isolation transformer.
--Was rescued from a water damaged cab in a damp basement, but monitor chassis not corroded/rusted
--I'm not monitor savvy, but can handle basic schematic work and have replaced a handful of capkits in other chassis. very novice, here. Thank you in advance.
--Did the cap kit from bob roberts.
--Did NOT replace the large ?filter? cap.
--chassis is grounded to the GND on the switching powersupply.
Problem 1-
There is a slight sine wave in the screen on the right.
--I can almost get it to go away with fine/finger push adjustment of the H.Freq pot.
but then the wave will just flip the other way.
--The H. Freq pot adjustment is very unforgiving and it's easy to cause the screen to go into striated diagonal lines.
What is causing this?
--Is this 60hz? will replacing the big cap help?
Problem 2-
the right side of the screen is slightly wider than the left side.
--notice the bricks i highlighted to emphasize the issue.
--play is decent but scrolling left or right creates an "accordian" effect as the bricks expand or contract in width.
Problem 3-
When I was running a Rockola Nibbler PCB, I was able to use the horiz and vert size to get the playfield to fit the monitor screen
--now that I'm running Tut, I can't get the horiz height to fill the screen. the horiz coil is adjusted all the way out, but it only made about 1/4 inch adjustment anyway.
--the vertical is pulled in to make the display items seem proportional. adjusting the vert any wider and it starts tearing the vertical lines into bars with spaces.
--Using the original isolation transformer.
--Was rescued from a water damaged cab in a damp basement, but monitor chassis not corroded/rusted
--I'm not monitor savvy, but can handle basic schematic work and have replaced a handful of capkits in other chassis. very novice, here. Thank you in advance.
--Did the cap kit from bob roberts.
--Did NOT replace the large ?filter? cap.
--chassis is grounded to the GND on the switching powersupply.
Problem 1-
There is a slight sine wave in the screen on the right.
--I can almost get it to go away with fine/finger push adjustment of the H.Freq pot.
but then the wave will just flip the other way.
--The H. Freq pot adjustment is very unforgiving and it's easy to cause the screen to go into striated diagonal lines.
What is causing this?
--Is this 60hz? will replacing the big cap help?
Problem 2-
the right side of the screen is slightly wider than the left side.
--notice the bricks i highlighted to emphasize the issue.
--play is decent but scrolling left or right creates an "accordian" effect as the bricks expand or contract in width.
Problem 3-
When I was running a Rockola Nibbler PCB, I was able to use the horiz and vert size to get the playfield to fit the monitor screen
--now that I'm running Tut, I can't get the horiz height to fill the screen. the horiz coil is adjusted all the way out, but it only made about 1/4 inch adjustment anyway.
--the vertical is pulled in to make the display items seem proportional. adjusting the vert any wider and it starts tearing the vertical lines into bars with spaces.
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