John's Arcade Forum - Classic Arcade and Pinball Collecting and Restoring Discussion Forum - RETRO MAME - Nintendo Vs Forum
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1  Tech and Marketplace / For Sale / Wanted / atari football on: April 03, 2016, 10:24:15 am
I need 2 punt plexis
2  Tech and Marketplace / I need help with my game! - Technical Discussion / Re: asteroids help on: July 14, 2015, 09:27:27 am
I am showing 20vdc on the two LM324N chips located on the main pcb. (boy that seems like a lot of voltage). but at least theres power there.
these are quad op amps that are notorious for causing a hum.
3  Tech and Marketplace / For Sale / Wanted / Re: Nice atari machines for sale in CT on: July 11, 2015, 11:15:10 pm
I hooked my tube up to a rejuvenator and zapped it 5 times until I was scared I might kill it, but its not coming all the way back. oh well, if I can get rid of a bad "hum" ill start restoring the cabinet. yours looks nice. real classic from '76...  see ya
4  Tech and Marketplace / I need help with my game! - Technical Discussion / Re: asteroids help on: July 11, 2015, 11:05:25 pm
thanks for the suggestion Ian, ill do that. I don't know how something as simple as an audio amp chip would kill the whole game. I did discover a small 3- leg transistor that had been "twisted" so the legs were shorting against themselves. ill be so happy if I can bring that game back to life.
5  Tech and Marketplace / I need help with my game! - Technical Discussion / asteroids help on: July 11, 2015, 08:00:20 pm
   While fixing a "hum" on my asteroids, I was desoldering  an LM324 (audio amp IC) on the pcb. but being a newbie I messed it up (maybe shorted something and/or ruined the chip) . when I went to power up the whole game was dead, except the marquee. wouldn't play blind, and the p1,p2 lights just steadily lit.
   Now upon power up I get neckglow for a second and then quickly almost no glow (is this the spot killer kicking in?)
   At the edge connector im getting just 8vac at pin 20, while the manual shows I should be getting 36vac. also im only getting 5 and 10vac at pins 7 and 10 of the molex connector feeding the monitor, when I should be getting 30vac. and  im not showing any voltage at the X and Y outs of the pcb.
   I am getting the proper 5 and 10.3vdc on the AR board, and I am getting 5vdc at pin 2 of the pcb edge connector.  Ive recapped the whole game including big blue, and replaced the bottlecap transistors on the chassis, and all fuses are good.  I really hope someone can point a newbie in the right direction. thanks for any help
6  General Category / Introduce Yourself / greetings from colorado on: July 11, 2015, 06:19:52 pm
Hi guys, im new to this hobby. I grew up in the 70's so my first purchase was a 1978 Atari Football, which was "the" game Ive always wanted. Soon after that I got hooked on the idea of restoring (because of watching johns arcade). Ive since gotten 2 fixer uppers (a 1976 Sprint 2 and a 1979 Asteroids) and im in the middle of working on those in my small condo, but I still have a lot to learn. Its been fun, and I hope to learn more here and make some new friends.
7  Tech and Marketplace / For Sale / Wanted / Re: Nice atari machines for sale in CT on: July 11, 2015, 11:29:04 am
nice Sprint 2. whyd you sell it? I didn't know the marquee was supposed to blink.(looks cool that way) mine just has a fluorescent up there. power supply on the pcb was always a problem on these, burning out the edge connectors. this was the 2nd game I ever bought, I really hope John restores his and does a vid on it. mine needs a better picture tube.  see ya
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