Asteroids Arcade PCB Repair (Again!) - Troubleshooting the "Watchdog" Circuit with Schematics !
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- เผยแพร่เมื่อ 13 ก.ย. 2018
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As always great work. Thanks for taking the time to film your repairs
Thanks Simon, we appreciate it!
Great to watch. You obviously know more than the average bear!
That's very nice of you to say Doug!
You need a shirt that says "I'm not an expect on these, but... " haha great video man I work in IT and my background is in electronics so I LOVE these videos where you dig out the schematics and go through your troubleshooting process.
That would be pretty funny, i'm working on another Asteroids PCB right now and man it is a tough one. Hopefully we'll get it running tomorrow :)
I love this stuff. The feeling of accomplishment when the issue is found feels great.
This is great! I have been working through an asteroids pcb repair for awhile now, and this video inspired me to play around with it some more!
You can do it!
Excellent video once again and once you pressed the start button, man what a flashback with that sound! Awesome! 😎
Love those sounds!
Asteroids oh yeah, it's got that nasty quadrascan XY monitor. Used to love working on the late 70s early 80s video games. Back then, the games were so new and popular it wasn't unusual for the cash box to overflow with 10 pence coins ( in the UK ) spilling onto the PSU and shorting it out. Funny, it's been 35 years since I saw an Asteroids board but recognised immediately that it was a video game board from the late 70s early 80s. Thanks for the nostalgic trip, makes me want to buy a faulty logic board just so I can repair it. 😁
PS. That schematic was from an era when you got decent documentation. Reminds me, I used to have a huge A4 style repair bible/manual which was written by Atari ( I think )
Harry I've always heard back in the day operators would burn through those transistors on the side (the deflection transistors) like candy until they figured out how the monitor worked and that they were expensive at the time....
@@LyonsArcade Yeah that was true but from an era where electronic repair of EVERYTHING was expected and MOSTLY done, these days, those kinds of repair are a niche market performed by a few specialists such as yourself. About 15 years ago an operator asked me to look at a faulty Daytona driving game, turns out someone had spilled a can of coke onto the logic board, I advised the operator to wash the logic board in warm soapy water and said "it's probably had it and even if it hasn't, the challenges of repairing a multilayered highly complex board is way beyond an oscilloscope and logic analyzer in a small workshop" the operator became abusive calling me a "...clueless idiot..." and saying "...I will send it to the professionals for PROPER repair..." I have to say, it was very satisfying to discover the PROFESSIONALS had returned the board with a note saying "beyond economical repair" some operators still think it's 1982 😁
Great channel dude.
Yeah some of them don't get it... there aren't even schematics available for Daytona. Super complex boardset too, likely one of the most complex ever actually. There's a guy at www.IRepairSega.com that can fix them, he used to be their tech at Sega and has the schematics and worked on them AT Sega so it's his specialty, but as you said a coke dropped on it (likely while it was on) even he's not going to be able to get THAT one going again.
by the way, I fixed a Stunt Cycle once, the old Atari Evil Knievel game... the manual in that basically tells you the entire logic setup, how each chip works, even down to some of the signals. I don't mean the schematics SHOW you, I mean they actually word by word explain the theory of the game. Very easy to troubleshoot because of that, but it was a much simpler time and board.
@@LyonsArcade Yeah Atari in particular were rather good at giving a circuit description which made things so much simpler. These days, there's no schematics and if there is one it's under licence costing an arm and a leg.
Love your videos! I've learned so much watching you go through your trials. Thanks to you, I've learned how to use my logic probe to troubleshoot and fix my Asteroids board.
Thanks Darryl, we appreciate it, good luck with your repairs!
Awesome job, love your videos.
Thank you Mark we appreciate you watching!
That little dot. If my memory serves me well there was a spot killer circuit for quadrascan monitors
There is... on the first version of the monitor for whatever reason something wears out and the dot shows up after it's been on awhile....
@@LyonsArcade The resistors in monitors have a nasty habit of changing value due to the heat causing some very weird issues furthermore the heat also screws around with the capacitors causing other issues. Out with the ESR meter for those, didn't have those in my day, in fact, you had a scope if you were lucky and a high impedance analogue FET meter, still got that just haven't got that heart to get rid of it 😁
Love your videos, These machines go back to the time I started in electronics proper aged 16, always wanted all the fancy kit and did get a lot in the end. I do own a digital scope bought it last year, it’s mainly in its box. I repair laptops now and my turn to tool is a meter on diode test mode... would love to have a stab at these repairs, this machine with its vector scan is especially interesting, could you run the output to a scope X, Y and Z inputs and get a picture? Thanks for putting the effort into recoding them, they’re great.
Thanks Pete! Yes, you can send the outputs to a scope I did it on one of the Asteroids videos on here somewhere a couple years ago. These vector Atari boards use some strange voltages but you could probably test and repair them with an adjustable power supply with multiple outputs and a scope for video! Thanks for watching, we have more videos coming soon :)
@@LyonsArcade Hi Joe, Sorry if off topic, I have a Midway Space Invaders for repair! :) L shaped job. Game boots shows Hi score at top CREDIT at bottom, doesnt draw any invaders and then reboots... been on it for 2 days without finding anything...
If you plug your video machine into a power filter sometimes that will save the electronics from surges and also brown out just a little bit of information to help these machines last longer have a good day bye-bye
That's true Clark, thank you for the info! Thank you for watching, have a good day!
I love this game! Good work from Italy
Thank you Nico!
real nice dude IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII
Nice job mate. Notice that the little dot goes away on the enter your initials screen. weird.
It has to do with there being more stuff on the screen on the enter initials screen, so the brightness is different or something. You can turn it down to where the dot disappears, but it makes the screen really dim, we just live with a little dot.
Love the videos guys, makes it much easier to understand the whole process. I recently picked up an Asteroids cabinet and I've found that it's missing the self test switch. Guess it was robbed at some point. I don't suppose you, or any other commenters, know where I could find a new replacement?
They put them in two places, look on the door close to the hinge, sometimes there's a little one there at the top of the door. The one inside by the volume pot isn't installed if the coin door is put on that has the switch on it....
@@LyonsArcade Thank you for the reply! You're right, it's just in a different place. I was thrown off by the black and white wire connectors that are dangling next to the volume control. Much appreciated!
How are you holding up with the Hurricane?
No big problems, just a lot of rain!
Hey! I am working on a broke Assturds board and B4 Pin 8 has no 3Khz clock to the watchdog circuit and there's also no 12khz clock on pin 10... Pin 1 DOES have a 750khz clock. Also B5 and C4 have all of their clock signals and they are accurate on the scope. Does this mean my B4 (LS393) is bad?
Yes it's almost certainly bad, since it's only 'feed' is that 750khz clock and if that's accurate on a scope your outputs should definitely be there. It's also a counter, and they're known for dying, instead of just inverting a signal or anding/nanding whatever, it's doing math. Counters and decoders fail first, usually.. LS161's, 163's, 393's, 139, 138, all those are very common failures on these older pcb's.
@@LyonsArcade it’s crazy I forced the watchdog disable low and drag the probe around e5 and d5 (shorting between pins) and I’ve manage to get the board to run a few times but I have no idea what I’m doing to make it happen it’s total dice roll. I better set ot aside before i fry more chips. I’ll wait til i can replace b4
Let's turn off the lights. Says Joe Classic arcade