Frogger monitor help...

gars943

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I'm recapping a Nanao KB930355 another number on the bottom of the board is KB240331. I have found an area near cap "C101" which has a pretty significant gouge across the entire copper contact area (see picture). I do not remember scrapping the board to cause this gouge. This board worked prior to removal, but the picture was very light and occasionally would go to a single line in the middle of the tube, then back to a picture.
My question is was this done intentionally by the manufacturer or in the field, as it crosses only one contact area, or do I need to bridge this gap.
Thanks,
Gary
 

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Ken,
The cap kit I bought lists it as a Sega-Nanao MC-2000-S. Does that shed anymore light on the subject?
Thanks,
Gary
 
Ken,
Here are the only markings I could find on the board top and bottom,(see pics). None of them match the numbers from the ones you have listed. Still concerned about the gouge on the contact on the bottom of the board. I agree with Mcdermd, that it looks intentional, and just wondering if anyone has seen this type of "fix" on a board like this...
Thanks,
Gary
 

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MC-2000-R / KB930355 is what i think that should be. i don't have one or any pictures to see if there was a mod on that trace. at first glance it looks intentional but the more i look at it i am second guessing that and maybe damage from handling/moving. i would see if you can find any pictures of that chassis. i have two froggers and one i know has a G07 and the other i don't know so if you don't find anything i can check that chassis to see what model it is when i go to my shop this weekend.
 
Security 1000,
If you could please, check your other Frogger for me, for this monitor board. I was going to install it tomorrow in my sons game and I am concerned about the gouge. Could not find any pics on line or any other info...
Thanks,
Gary
 
Well as it turns out, yes it must have been a factory mod. After plugging it in today, it powered right up and is working very well.
Thanks everyone for your help,
Gary
 
@gars943, if you happen to be able to, could you please let me know what the neckboard neck connector size/name is on this chassis ? A CR-25 per chance ?

Or anyone else that has knowledge on this chassis know ? Thanks !
 
@Infa Red

Nanao MC-2000-S/ Kaga KZ-20EN-L
(1) Makers Mark - KB240331B silkscreen in white on the parts side of board
(2) Tube - 510NJB22 or 510 UKB22
(3) Tube Socket - B&K CR-25 http://wiki.arcadeotaku.com/w/File:CR-25.jpg - Green color socket

Nanao MC-2030-S/ Kaga KZ-20ES-L
(1) Makers Mark - KB240331D silkscreen in white on parts side
(2) Tube - 510WUB22
(3) Tube Socket - B&K CR-23 http://wiki.arcadeotaku.com/w/File:CR-23.jpg - Brown color socket

Nanao MC-2000-R
(1) Makers Mark - KB930355 silkscreen in white on parts side
(2) Tube -
(3) Tube Socket - B&K CR-25 - Green color socket - https://www.arcadepartsandrepair.com/wp-content/uploads/2018/04/Sega-Nanao-MC-2000-R-Top.jpg
 
Ya'll are awesome ! Thanks

The confusing part was I was thinking the KB930355 was the name of the monitor, lol.. Got it, so this is the ever so classic Nanao MC-2000 series..ok.

So quick thing. I believe it is the S and not the R. Check out this eBay listing for the manual of a S:

Notice the 3rd pic shows it showing the board marking, clearly KB930355.

I found the same guy selling the manual to the R and it has different PCB markings according to Sega.

Though of course correct me if wrong. But it would mean that @security0001 maybe has that pic labeled wrong ? Should be the S and not the R ? (just trying to help here). OR is it that one is the vertical version, the other is the horizontal version, and BOTH use the KB930355 ?

Next - I notice in either case, it seems to keep calling the tube for it a 20". But isn't 510mm face and 19" viewable the same thing ? Oddly on tubular's page it doesn't list the 19V's with a CR25 neck as "same size" but at least same pinout.

Reasoning behind such questions is, I would like to use a 19V tube with this chassis... possible ???

Screenshot 2024-01-19 at 1.09.03 PM.png
 
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Ya'll are awesome ! Thanks

The confusing part was I was thinking the KB930355 was the name of the monitor, lol.. Got it, so this is the ever so classic Nanao MC-2000 series..ok.

So quick thing. I believe it is the S and not the R. Check out this eBay listing for the manual of a S:

Notice the 3rd pic shows it showing the board marking, clearly KB930355.

I found the same guy selling the manual to the R and it has different PCB markings according to Sega.

Though of course correct me if wrong. But it would mean that @security0001 maybe has that pic labeled wrong ? Should be the S and not the R ? (just trying to help here). OR is it that one is the vertical version, the other is the horizontal version, and BOTH use the KB930355 ?

Next - I notice in either case, it seems to keep calling the tube for it a 20". But isn't 510mm face and 19" viewable the same thing ? Oddly on tubular's page it doesn't list the 19V's with a CR25 neck as "same size" but at least same pinout.

Reasoning behind such questions is, I would like to use a 19V tube with this chassis... possible ???

View attachment 716461
Japan counts the entire face of the tube in their measurements, not the viewable area like North America. hence a 19" here is considered 20" there. or famously the candy cabinet nerds exclusively call 27" monitors 29" there. :p I believe 13" monitors are 14" there also.

for posterity, the Sanyo 20EZ is a 19" monitor, but they call it a 20.

I wouldn't go swapping tubes with those things at all. I've serviced Nanao MC-2000s.
 
I wouldn't go swapping tubes with those things at all. I've serviced Nanao MC-2000s.
I'm actually not really "swapping tubes". What it is is I came across a CR25 tube that tests great. Its a 19vxxx. Upon my research (here, and other threads about it) it appears the MC-2000 is a CR25 chassis/neckboard. And I happen to come across one on eBay (thanks to @Scumolabs) and hence me chiming into this thread to verify, etc.. So I'm just really maybe thinking about piecing together a monitor instead of giving it away. As no one seems to be interested in it, and hell, I could use another good tube'd monitor.

Japan counts the entire face of the tube in their measurements, not the viewable area like North America. hence a 19" here is considered 20" there. or famously the candy cabinet nerds exclusively call 27" monitors 29" there. :p I believe 13" monitors are 14" there also.

for posterity, the Sanyo 20EZ is a 19" monitor, but they call it a 20.
Yea I figured all that, my question is why tubular site calls 19v "a different size" than 510mm. So I was curious is there any even slight differences in the total face of either ? The viewable areas of either? AND the mounting holes to a frame of either ? Comparable wise speaking. Also would a chassis originally expecting a 510mm tube freak out if it was driving a 19v tube ?

2.jpg

if you don't notice, on the website, he always separates 19v's & A48's from 510mm's *size wise* and to me I thought what you said about the subject, so I am confused. Are they the same size or not ?
 
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Yes, they're exactly the same. You better refer to this page for CRT designations and sizes:


The size chart lists CRTs according to face and screen diagonals with examples from all designation systems. The size we're talking about here is 20" (51cm) / 19V (48cm).
@M K L
I use this page all the time. I think I saw somewhere that you created it? If so, Thank you it is an amazing resource for the community.
 
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