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Dig Dug - Arcade PCB repair - Multiple CPU and bus signal issues
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- čas přidán 12. 08. 2024
- This is the longest repair vid so far I think. I sure hope you can sit through this lengthy repair... The game pcb this time offers lots of challenges. It has a never seen before complicated triple cpu design - and there is a multitude of bus and signal issues going on. Enjoy!!!
This is probably one of the most informative videos on pcb repair I have ever seen. Thanks!
This is one of the best arcade PCB repairs I seen. Thank you ! This should help me with my Dig Dug repair.
Great job with the repair. Loved hearing the explanations and your thoughts as you went along. Thanks for taking the time to upload and share!
Thank you very much for watching - glad you enjoyed it 😀
after watching this repair video i just wanted to say you are definately a patient person most people would have given up but you still carried on, im definately going to keep watching your repair videos im going to try to attempt to fix my original terror force pcb board myself but im new at all of this so im learning as i go.
Well I was really about to just dump the board at several difficult situations in the repair process. ;-) Glad I hung on.
In a recent video you showed how to track issues like this down with the basic tools like a logic probbe and oscilloscope. After watching this video, I think those first three chips would've been possible, but that last one that was intermittant would've given you a headache if you didn't have the fluke. I love the approach, though. Work on one problem at a time, don't try to move onto another area of the board until you know you've found everything on the area you're working in.
Thanks for the great videos. They're a real pleasure to watch!
Nice job! I can never learn enough methodical fault finding from a pro. That last buffer with the intermittent failure would have been a tough nut to crack without the Fluke I think. I wonder if there are any modern replacement projects for the Fluke. It looks like an invaluable tool for fixing retro stuff and shouldn't be too hard to make.
Well one could design such a tool which might be even more useable or useful today for troubleshooting old microprocessor circuits. I recently discovered that some guy from brasil sells some DIY kits (basically pcbs and parts lists) to actually build a new fluke and also some of the pods. I'm still thinking if I should buy one set for the 6809 pod and build one myself.
Nice job with that repair. During the video, I coudn't stop thinking of how I would have done without this magic Fluke equipment! 😊
Yes it would have been more difficult. Actually I am working on a repair right now that is very complicated because I am dealing ith a cpu problem and can't use the fluke to trouboeshoot it because I don't have the 6809 Pod for it. ;-0 Will have to fix it without...
@@christophzett good luck tracing OE, WE, CE lines 😉 (this is how I do, no choice!)
Fantastic work! That board had quite a few issues =O
Endlich mal wieder ein langes und interessantes Video
Schöne Fehlersuche 👍👌
Dankeschön 👍
Good sleuthing as always!!
Thanks man!
Well done, and thanks for making the video
Thank you - you're welcome!
Deine Videos sind so gut, wir brauchen mehr mehr mehr mehr
Kommen! Kommt das von google translate oder kannst du Deutsch? ;-)
@@christophzett Google translate:0, next video soon??????
Viel gelernt, danke!
I hope you enjoy in Munich 2022 Europe champion Chip competition
Thank you! But I'm not really into athletics. I'm a nerd! ;-)
Yay! 👏 Well done with this repair. As usual, a very systematic and comprehensive approach to diagnosis and fixing of the faults. Admittedly it needed the "big guns" (oscilloscope and Fluke) so not everyone would have the resources to do this fix but it was very interesting to follow your methodology. As soon as you showed the 74LS245 I thought "there is a prime candidate for failure" straight away! They do tend to fail rather often (as do '04 hex inverters) which is quite alarming as I use these a lot in my designs! The only issue I would have with your testing is that these devices need to be checked for 4 cases - correct inputs reaching the device on reads and writes and those inputs being transferred to the outputs correctly on both reads and writes. Finally I must complement you on your English - "tertiary" is indeed a word in English and one that most native English speakers would not know. I would not have even dreamt of trying to translate this using my basic schoolboy German! 😳
Thank you very much! Well I also also thought about keeping the big guns more out of future repairs. You sure got a point there.
Another great video. Do all arcade boards have that "watchdog" ?
Not all of them but some. Generally a good idea to implement such a thing.
With Dig Dugs, you're better off replacing all the sockets and cleaning up all the Customs before starting troubleshooting. Bad sockets and corroded customs cause a majority of the issues.
Absolutely right. It is really worth your time cleaning everything up and aussuring an overall good connection status in advance before even beginning. In this repair I stumbled from one 74 logic ic issue to the next and ended up with a working game - but nevertheless before I put the pcb in the shelf I will also clean everything and replace sockets if necessary. 👍
Schönes Repair Video. Macht wie immer Spaß zu schauen. Schade nur, dass es so niedrig aufgelöst ist, also 360p. Die anderen Videos bei Dir waren bisher wenigstens 720p. Ist da was schief gelaufen? Zu DigDug: einer meiner Lieblingsautomaten in den 80ern, weil man für 1 Mark relativ lange zocken konnte. ;-)
Ich hoffe es ist auch in 1080 jetzt verfügbar, vielleicht kannst du das nochmal checken…
@@christophzett Jepp, lauft. Sehr geil. Danke! Und mach weiter so tolle Videos, ich liebe diese Repair-Videos von Dir, weil sie sehr informativ und lehrreich sind.
one of the best games
Yes it is!
Which chips are responsible for graphics? Is there any one chip responsible for the title screen?
That 50 ohm seems to be to VCC, not GND.
Yes, correct actually - have to admit that I measured it wrong in the video. 😅 It was 48 Ohms to +5V but even less to GND - I think is was 30 Ohms or something like this.
Wir brauchen schnell ein weiteres Video
Kommt...
@@christophzett so is Christmas 😁
When the CPU is writing Address 6830 the decoder IC chip will output a watchdog reset signal? Why didn't you use the FLUKE to WRITE to address 6830 and loop it when testing the decoder IC chips and other IC chips?
Yes, that would have been another elegant option to show that the watchdog couldn‘t be stopped by the cpus. Many roads lead to Rome.
@@christophzett Even you jumper the "disable" the Watchdog circuit, the decoder IC chip was still outputting a watchdog reset signal even when the watchdog circuit was Disabled?
@@christophzett Most ROM Signatures are testing the ROM chips Full Maximum Range . In the video you're only testing a very small ROM portion/region but have the signature for that small range ROM region. How did you get those signatures? Most signature only will test the Full ROM range only