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DKJR Sanyo EZ 20
Question from Wayne: Hello,
I’ve watched all your videos on Youtube and I’m very impressed with the level of detail presented in each video. I am a complete novice at repairing arcade games and have a couple of questions regarding the Sanyo monitor in my Donkey Kong Jr. That I recently purchased on Craigslist.
I want to make this a JAMMA standard game. I’ve already purchased the JAMMA wiring harness, 60 in 1 JAMMA board, and new power supply. Currently I have everything hooked up to my LCD flatscreen computer monitor and it works great, but now it’s time to get the Sanyo monitor to work.
Prior to de-gutting the game, everything worked just fine except for some white vertical lines towards the top of the screen (the screen is set in a vertical chasis). I know by watching your videos that I most likely need to purchase a cap kit to fix this issue.
Upon further research, I read that the Sanyo monitors are set to a negative video input instead of positive. What do I need to purchase to address this issue? Maybe a video inverter? If so, who makes them? I’m assuming the JAMMA standard is positive.
The Sanyo monitors run off of 100V. Is there any way to convert the monitor to the 115V standard? Basically I’m trying to avoid having two power cords come out the the back of the game since everything else runs off 115V. The marquee light has already been changed to the 115V standard.
I know that keeping my LCD monitor hooked up permanently is an easy solution, but I’d like to address the monitor issues and try to give the game and graphics more of a classic look.
From what I’ve read, the Sanyo monitors appear to be more difficult to fix than others (go figure). If I knew then what I know now I would have purchased an arcade game with a more user friendly setting. One of the things that sold me on this game was the zero burn-in on the tube!
I do have experience with soldering but not on PCB’s.
Any advice you can give on my questions would be greatly appreciated. Keep up the good work on your videos and website. Have a great day.
Wayne
1 answer
Response from Jonathan: Wayne,
It sounds like getting this Sanyo monitor to work as a monitor for your MAME is going to be quite an undertaking. To answer your questions, yes you will need to either buy a video inverter or build a circuit to get the sync working. Here’s a diagram from TwoBits that shows you how to build a circuit to convert the sync: http://www.twobits.com/RGB/possep2negcomp.html. There is also an entire article on the Sanyo 20EZ on JammaBoards: http://www.jammaboards.com/jcenter_nintendo_monitors.html. Check near the bottom of the article for the information pertaining to your issue. The power is not as much of an issue as you probably already have what you need. The isolation transformer in the bottom of the game takes in 120 VAC and converts it to 100 VAC. As long as you leave that in your cabinet it should work fine. If you’re talking about rebuilding the monitor chassis to take 120 VAC then that’s going to be an uphill battle. That brick in the bottom doesn’t really hurt anything and even if you had another monitor you would probably still have an isolation transformer in the bottom of your cabinet.
The more we thought about these issues, the more we thought it might just be easier to get another monitor. There are several collectors out there who are looking for these Sanyo 20EZ monitors who might even be willing to trade you straight up for a Wells Gardner or Electrohome monitor. Of course, one of these monitors would keep you from having to do all of the things we described above and make your conversion much easier. If you’re interested in this let us know and we’ll put the word out for you.
We have also featured your question on episode 14 of our Q&A podcast. Please listen to it for more of our thoughts on your question. Thank you for your question and keep us updated on your progress.
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