Donkey Kong Jr Arcade Help Needed

[ckirkman]

Hello,

 

I have a Donkey Kong Jr. and the colors are off in the center (about 50% of the screen). It was fine and I moved the game about 5 feet and now it is not. I am guessing something is loose, but I am not sure what to check on the monitor or chassis. The wiring harness and connectors all seam fine and secure. I know bad things can happen if I fool with the suction cup on the tube and the flyback, but any ideas or suggestions would be appreciated. Thank you.

[racerx]

I would try degaussing it first.

[bennybingo]

You can also try re-seating the eprom chips on the board. Occasionally, over time, they become loose and can cause funky things to occur…though, this is just one thing that could possibly cause this.

[DaytonaUSA]

I would try degaussing it first.

 

 

I saw that switch on my Lost World arcade machine. What does that do?

 

Dont mean to hijack the thread.

[bennybingo]

 

 

I saw that switch on my Lost World arcade machine. What does that do?

 

Dont mean to hijack the thread.

http://www.castleclassicarcade.com/archives/monitor-purity-issues

[DaytonaUSA]

http://www.castleclassicarcade.com/archives/monitor-purity-issues

 

 

Ah, cool thanks! Glad I didn't run it, my colors are fine.

 

But for the original poster, this sounds like it would be the perfect fix. Hope he tries that!

[racerx]

Rather than fart around with trial or error placement of magnets like that article suggest, look into borrowing or buying a degausser. They're relatively inexpensive,

 

http://www.arcaderepairtips.com/2010/01/27/using-a-degaussing-coil/

 

In a pinch, you can also use a cordless drill to move around the monitor...the magnet in is typically strong enough to work.

[ckirkman]

Rather than fart around with trial or error placement of magnets like that article suggest, look into borrowing or buying a degausser. They're relatively inexpensive,

 

http://www.arcaderepairtips.com/2010/01/27/using-a-degaussing-coil/

 

In a pinch, you can also use a cordless drill to move around the monitor...the magnet in is typically strong enough to work.

I am going to try the degaussing coil. The cordless seamed to adjust the colors correctly, but not permanently.

[ckirkman]

I finally purchased a degaussing coil, and like magic the picture is perfect! I want to thank every one for there responses/help.

[DaytonaUSA]

I finally purchased a degaussing coil, and like magic the picture is perfect! I want to thank every one for there responses/help.

 

 

That's awesome! Glad it worked . Enjoy your DK JR machine .

[onmode-ky]

Congratulations on a successful degaussing! But your topic has made me wonder if the degausser in my Awesome Arcades AC-605SP (built by one of Curt Vendel's ventures a few years ago) monitor is the source of its strange problem. I'm not getting color distortion, but every time I switch on the machine recently, there's a loud buzzing for over a minute before the system actually begins booting. It sounds like the type of buzzing you hear from magnetic field interference with speakers (low frequency, occasional change in pitch presumably caused by a change in the affecting magnetic field). Could the monitor's degausser be, I don't know, going haywire for a minute before stabilizing? Please note, I fully admit I don't know how a built-in degausser actually works.

 

Then again, maybe it isn't the monitor at all, but just sounds like it (it seems to me like the sounds are coming from the speakers, which are right next to the monitor). It's a bit strange that the motherboard (along with everything else) does not seem to power on until the buzzing is all over; if it were strictly a monitor issue, the motherboard would get going on its own, wouldn't it? So what's holding it back? Frankly, I'm dumbfounded.

 

I guess my question as far as this topic goes is: can a monitor's built-in degausser malfunction so as to emit a strong magnetic field, for no short amount of time, when the monitor is switched on?

 

onmode-ky