Arcade Collecting > Restorations & repair
1975 Atari Crash 'N Score Restoration
ChadTower:
You can just drop a car speaker in there if you can find one the right size. Don't go nuts looking for a good speaker to play buzzes and beeps.
Level42:
Heh, I forgot to include the link I had meant to put in there....
http://www.therealbobroberts.net/parts.html#atari
Really cheap speakers.
ChadTower:
Meh, it's ridiculously easy to reap a cheap speaker locally. Get it from a car, from an old stereo, from a TV, it's just too easy to find to bother shipping one.
Majoraslayer:
I'd rather get one from a TV. I've used car speakers in the wrong application before; trust me, its best to use the impedance the output amp was designed for rather than risk blowing the speaker output.
Well, I finally tried turning it on a few minutes ago. The speakers made a beeping racket (though it obviously wasn't the game), so that tells me the sound output of the board is working. Also, the monitor powered on nice and bright (though there were a couple of problems I'll get to in a minute). This also tells me that my power supply is good, and the power processing on-board is probably good.
Now for the problems. Note that when I was testing it, I didn't have any controls or the coin box attached as these controls (except for the steering wheel) were all momentary switches.
When I hold the power button down, the speakers make a constant noise like the Atari simulated engine patterns. All of the LEDs on the board light up (though for some reason my service manual doesn't seem to explain how to use them diagnostically. The screen is squished together toward the center (possibly just needing adjustment, or a cap kit). There doesn't appear to be any movement on the screen, but it is possible to see the flags lit up.
Any ideas on how to troubleshoot this?
Majoraslayer:
--- Quote from: ChadTower on August 27, 2009, 11:02:32 am ---BTW, if you need any info on rebuilding that monitor (it looks like a Motorola XM-501) find my Tank II thread. It's either in projects or restoration. There is a LOT of detail in there on that monitor including how to build a test adapter for powering it off the 110v from the wall and use a VCR as a known good input source.
--- End quote ---
According to the service manual, it should be a Motorola XM701 with a 23-inch B&W screen. Though it powers on and shows a picture (sort of), when it powers off the screen shrinks down to a small dot in the center of the screen that slowly fades. Its also out of focus, so since I've not made any monitor adjustments I'm sure a cap kit would do it a lot of good.
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