Bally/Midway TRON Arcade PCB Repair - follow up about sound problems
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- เผยแพร่เมื่อ 7 ก.พ. 2025
- This is a follow up video regarding sounds on MCR2 system boards for TRON etc - i'll go over the hiss issue you might run into and what I do to work around it without pulling a machine apart.
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Would love for you to do a video of how you made your MCR to Jamma bench test adapter!
I can't really say any more than I just followed the pinout in the manual for it. The only potential tricky bit is creating the correct sync pulse for the test monitor. I used an XOR gate to combine the H and V sync signals and then invert them again to get a negative composite sync signal.
This loom isn't intended for me to play the game, literally just see it and hear it.
To test inputs I ground pins using an alligator clip lead.
Thanks for this video. This helped me to solve a very similar problem with my Tron PCB.
Love the Florida shirt, represent from Tampa!!! -- Greg
What does MCR stand for?
Midway Card Rack I believe.
MCR1 was games like GORF which sat in a cage on a backplane.
MCR2 are games like TRON
MCR3 are Tapper, Spy Hunter etc.
Love these tech vids wish there were more!
I have an error of D3 coming up on power up on my Tron. Any idea where to look or how to troubleshoot?
If the screen is saying "ROM ERROR D3" then most likely you will have either an actual bad EPROM at D3 or the chip controlling its select line is not working. Either way you will need to open up the board stack and get to the CPU board as that's where those EPROMs are.
Thank you for that brilliant video. One question, do you know if the 3 stacked pcbs in the cabinet need an edge connector on top? in my cab I see , every pcb has an pcb edge connector in the middle but nothing is plugged in here ? Strange. Do I miss something ?
In your other video where you fix the pcb, on the worktable I see, that you only had 2 pcbs folded out and it works?
There's no "edge connector" for TRON, there's a single 20 pin 0.156" connector which supplies power, that goes to the middle board. The rest of the connectors are 0.1" which go to the other points. You can run a TRON without the sound board connected so in the video where you see just two boards, i've got the CPU board (middle) and the sprite board connected and working on getting those going and then do the sound last.
Re-reading your comment I didn't answer what you were referring to. The edge connectors you see are for test purposes, if you read the schematic, you'll find that a lot of CPU signals are presented at these connectors. I would assume that they were for factory use for test or repair. In theory, I could create a similar diagnostic rig for working on the video boards but to be honest, its just as simple to make a harness and use the Fluke 9010.