Recent content by rchadd

i seem to have fixed the issue :) when i tested the transistors on the interface board with mulitmeter in diode test mode it seemed that following transistors were bad: tr201, tr202, tr207, tr208 I replaced all these with new 2N3904 transistors and reflowed the edge connector solder and now...

i have fixed my k4600 vertical collapse issue. I tested the transistors on the XY board using multimeter in diode test mode and it confirmed that tr305 and tr306 were bad. the schema indicated following codes for the transistors: tr305 2SA490 tr306 2SC1625 I used a TIP31 instead of a...

hi did you manage to fix this completely? i just did exactly the same thing! :( which transister did you replace? is fact that you needed to adjust something and that still not 100% indicate some other component(s) on the xy board need replacing?

i tested the game with a different monitor and it looked great so i think that indicates the gorf RGB board is ok. this is a monitor issue i think.

Ok thanks ken i will need to check to see where i can get this tested. i guess a TV repair place would do this? Would they have tester compatible with arcade monitor tubes? do you think bad tube is now the most likely problem? Any other components I should test? I am still wondering about the...

useful information: http://www.youtube.com/watch?v=XArHdR78K9M

hi ken i haven't replaced the pot - do you think that could be related to problem? i bought the caps locally from supplier here in uk. i couldnt get a pot looking like the one already there (eg 4 legs) . the only pot i could get was 3 legged sub-miniature type like this...

hi unfortunately it seems that the capkit did not help the situation. as shown in original photo i am still getting same issue with the colours being off. the background is supposed to be black but appears as purple and text that should be yellow is appearing as white. i am also still seeing...

ive got a similar issue with my k4600 but its bad from turn on. i get a purple screen and see similar scan lines! i've just installed capkit and it didn't fix it. next thing i am going to look at is the neckboard transistors... heres my thread with pic...

hey what is your control panel graphics? doesnt look like mine! do you have an overlay?

Hi I have a MTC9000 that seems to take a while before it displays a picture. When it tried it the other day the first few times nothing was not displayed at all. On 3rd time of switching on the game and waiting a few minutes for the image finally displayed. Any ideas how to resolve this? Which...

Help I switched my gorf on today and now getting a bad display. I hope someone can assist. Please see attached screen shots. The game can just been seen to running/playing ok but the colours are wrong and very faint also there seems to be scanlines displayed too. any ideas what could be the...

i replaced the 10K pot on the adjusment board and although it did seem to improve things a little but its was still too wide. i also tested with a 25K pot instead and no difference. i have also applied cap kit. any other ideas? any other components that could be at fault?

What is expected time for an old arcade monitor to startup and display the full screen. i have old mtc9000 monitor that i have just fitted a cap kit (i didnt replace the big blue cap) on and i don't see any improvement in the startup time. from switch on it must take nearly 10 seconds to...

i measured the resistance of the pot that adjusts the Horiz Amp and it seems to be measuring low when at maximum rotation... Question: Am i right in thinking the higher the value of the resistance of the Horiz Amp the narrower the image is? Currently thinking of replace the pot and see what...