Ronnie Dent
Active member
Thought I would start a thread here as I will be doing some work on this to get it nicer. Was lucky enough to find this very local and got it for a good price, reported as not working but when I went to see it it was producing a small twisted picture but could see the game running nasty hum coming from the speaker, there were no keys so unable to look inside but was happy with what I could see. this was it when I got it home.
Very original and untouched. Managed to get the back doors off without damaging the locks or door with a close fitting key. I will file down the levers to make this key fit.
Very dirty dusty inside but good honest muck!
Have already made a couple of posts on the sound issue as after setting the pots on the screen it produced a decent picture but could do with a cap kit. I have all the caps apart from a 330uf 100v and not sure about the big 3 in 1 cap on the chassis?
Back to the sound, I had no sound apart from a loud hum tracked this down to LM3900 at L2 which is beside the volume pot, think it's a pre amp for all the sounds? this restored most sounds apart from base fire, I replaced both the LM3900's at M4 and P4 and that cured that. Also replaced all the electro caps on the sound board.
Then it started acting up! dots at the top of the screen spreading all over then freezing and or re setting! checked the 5v witch was well low at 4.678, adjusted that up and all was well again, for a short time anyway! as it started getting dots at the top of the screen mostly on the right above invaders and in the score area. I pulled the board out and re seated the cpu and roms cleaned all the edge connectors and replaced the electro caps on the motherboard. It seems ok again but I'm not convinced the problem is cured!
The control panel is fairly worn as you would expect, but I know this machine has only ever been in one arcade.
Ronnie Dent2014-05-11 20:48:46
Very original and untouched. Managed to get the back doors off without damaging the locks or door with a close fitting key. I will file down the levers to make this key fit.
Very dirty dusty inside but good honest muck!
Have already made a couple of posts on the sound issue as after setting the pots on the screen it produced a decent picture but could do with a cap kit. I have all the caps apart from a 330uf 100v and not sure about the big 3 in 1 cap on the chassis?
Back to the sound, I had no sound apart from a loud hum tracked this down to LM3900 at L2 which is beside the volume pot, think it's a pre amp for all the sounds? this restored most sounds apart from base fire, I replaced both the LM3900's at M4 and P4 and that cured that. Also replaced all the electro caps on the sound board.
Then it started acting up! dots at the top of the screen spreading all over then freezing and or re setting! checked the 5v witch was well low at 4.678, adjusted that up and all was well again, for a short time anyway! as it started getting dots at the top of the screen mostly on the right above invaders and in the score area. I pulled the board out and re seated the cpu and roms cleaned all the edge connectors and replaced the electro caps on the motherboard. It seems ok again but I'm not convinced the problem is cured!
The control panel is fairly worn as you would expect, but I know this machine has only ever been in one arcade.
Ronnie Dent2014-05-11 20:48:46
