Neotec NT-1915 can't center picture on the vertical

Mike Fix

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I can't center the image vertically. I've cranked the knob as far as it would go and it won't budge anymore.

CRT_adjust.jpg

On the chassis I have no idea what I can turn, but it doesn't look like a lot of options.

MR DO HARNESS2.jpg

If anyone has any suggestions. It'd be much appreciated!

Thank you!

-Mike
 
I found this in the Mr. Do manual. Anyone have an idea if this is what could help solve the problem? Is there an adjustment on the PCB for the horizontal and vertical?

MrDo_adjust.jpg
 
you have working sync. nothing there will make a difference. you need to adjust V. Size if the picture is getting cut off, then V. Center to reposition it
 
you have working sync. nothing there will make a difference. you need to adjust V. Size if the picture is getting cut off, then V. Center to reposition it

I've cranked the V center as far as it will go and still cuts of the image. I can try adjusting the size, but I doubt that'll change things much, but I'll try it! Thanks for your reply!
 
I squeezed the image. Not sure why not all of the image is being displayed. That seems to be part of the problem.

View attachment 792622
your picture of the deflection board, there's a blue SUB V. SIZE pot in the middle. I wonder what that does? :unsure:

also I can't tell if those caps are original or not. if they are (you can look at the solder underneath) then I would strongly encourage sourcing a cap kit from APAR. Neotecs are a total grey area for monitors because they have variations even between the same model. there will be caps that are used and others that aren't. if those locations are empty you leave them empty, you don't add caps where they're not needed.
 
your picture of the deflection board, there's a blue SUB V. SIZE pot in the middle. I wonder what that does? :unsure:

also I can't tell if those caps are original or not. if they are (you can look at the solder underneath) then I would strongly encourage sourcing a cap kit from APAR. Neotecs are a total grey area for monitors because they have variations even between the same model. there will be caps that are used and others that aren't. if those locations are empty you leave them empty, you don't add caps where they're not needed.

I squeezed it with the v size knob to see if it was even showing the whole game image which it doesn't seem to be.

The way my brain wants to think about it is that the CRT may not be getting the complete game image from the board. With that said, I have practically zero experience working on these games, but doing my best to learn so I can work on them myself. Neotec seems to have gone away and I can't find a manual or repair manual for this chassis, so I feel like I'm playing darts with a blindfold on.

I very much appreciate everyone's help here.

Thank you!

-Mike
 
Neotec seems to have gone away and I can't find a manual or repair manual for this chassis, so I feel like I'm playing darts with a blindfold on.
Looking for a repair manual for a specific model is fine, but it's like buying the manual set the timing on a 1989 VW Rabbit. Useful once, and teaches you how to do something on that one car, but it doesn't teach you how what timing is, why it's important, or how to set it on the majority of vehicles. Not to mention most stuff in this hobby does not have a manual much less a repair manual.

I'd suggest starting with the basics if you're really interested in learning to fix CRTs and look up the Randy Fromm books. If you just want to fix this one, that's one thing, but if you want to stop feeling like you're playing darts, it may do you well to learn how they work to start.

There's also a really lovely, free, text-only site somewhere that has most of the basics of how a CRT operates and how to address most issues (in a general sense). It's a few hundred pages long, but I cannot remember the name of it to save my life right now.
 
Looking for a repair manual for a specific model is fine, but it's like buying the manual set the timing on a 1989 VW Rabbit. Useful once, and teaches you how to do something on that one car, but it doesn't teach you how what timing is, why it's important, or how to set it on the majority of vehicles. Not to mention most stuff in this hobby does not have a manual much less a repair manual.

I'd suggest starting with the basics if you're really interested in learning to fix CRTs and look up the Randy Fromm books. If you just want to fix this one, that's one thing, but if you want to stop feeling like you're playing darts, it may do you well to learn how they work to start.

There's also a really lovely, free, text-only site somewhere that has most of the basics of how a CRT operates and how to address most issues (in a general sense). It's a few hundred pages long, but I cannot remember the name of it to save my life right now.

I mainly want to fix this one, but at the end of the day as I buy more cabinets, knowing how to work on these things seems to be worth knowing! Thank you for your recommendations!
 
As @mecha suggested, did you try adjusting the sub V size and/or V-line pot? I can't tell from the picture what that third pot is for, but I'd assume it has something to do with vertical since it's in the same section.
 
As @mecha suggested, did you try adjusting the sub V size and/or V-line pot? I can't tell from the picture what that third pot is for, but I'd assume it has something to do with vertical since it's in the same section.

If it was on that control panel. I turned it. I tried turning all of the knobs. I didn't try any of the knobs on the chassis itself, I only turned knobs on the control panel.
 
I've now turned every single knob on the chassis and the image is still cut off on the left.

It's almost like it isn't even receiving the complete image to display.

-Mike
 
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