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Naomi Uni Monitor Issue

Posted: Fri Jul 03, 2009 5:43 pm
by OldFoo
Hi guys,



This is my first post on the forum but I have been stopping by every so often since I got my first Naomi hardware a few years ago, whenever I've had an issue I've always found a solution on here.



My first Naomi setup was a supergun built around a Naomi 2 GD-ROM system which has never really given me any grief, so when I got the chance of a good deal on a Naomi Uni cabinet needing repair locally I decided to go for it.



The issue with the cabinet was that the monitor didn't display an image. However, sound was coming through the speakers and when I connected up an external monitor I did get an image. A while later I got hold of a monitor out of another machine but found there was a gap between the monitor and the bezel. My solution to this was to use the tube from the old monitor on the new one.



When I turned the machine on the monitor worked and had a crisp, bright picture. However, the horizontal and vertical size/positions needed to be altered. I did this through a remote board mounted under the screen and got the vertical sized and positioned but found that the horizontal was stretched too far across the screen, even on the lowest setting (I have provided an image below to illustrate this).



Image



If anyone knows how I can remedy this problem so that the full image is visible your advice would be much appreciated.



PhillMartin

Posted: Fri Jul 03, 2009 6:04 pm
by OldFoo
its not as simple as just swapping crt tubes,if the deflection yoke does not match the chassis you will get various problems from width to complete destruction of the monitor deflection circuit

you need to let us know what monitors you have(make and model) so we can see if the specs are similar

Posted: Sat Jul 04, 2009 5:19 pm
by OldFoo
I've just had a look inside the machine and took some pictures of the monitor, chassis and control board. The chassis had the number 29E31S on it. Below are pictures I took of the monitor itself:



Image



Image



When I said I changed the tube in my earlier post I didn't mean I'd removed the deflection yoke, I just swapped over the cables from the control board and where the white circle is in the photo.



Image



PhillMartin

Posted: Sat Jul 04, 2009 10:02 pm
by OldFoo
well you have a mismatched chassis,if you continue to use this chassis on that yoke/crt sewtup then be prepared for a burn up

Posted: Sun Jul 05, 2009 10:35 am
by OldFoo
Ah right,



Can you recommend a correct chassis/CRT combination and where I could find it?



PhillMartin

Posted: Sun Jul 05, 2009 1:22 pm
by OldFoo
also i just noticed that the purity rings are missing



only chassis i know that fits onto ms2932 is the rodotron 666b1 or wei ya 3129b

i think alva amusements sell one of those 2