K7000 sanity check

obitus1990

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I have to cobble together a 19" K7000 with a likely compatible tube (based on the yoke Ohm readings, at least). The pin headers on the donor TV chassis are different than what's on the k7000 chassis, so I ordered the appropriate connectors and pins to swap the connectors out on the yoke wires.

The color scheme of the yoke wires is different as well, so I checked the Ohms on the yoke and determined which was the horizontal and which was the vertical. What I am unsure of is the pinout for the yoke connection on the K7000, meaning I don't know which pins are for vertical and which are for horizontal.

Looking at the schematic, I am ASSUMING that the pins marked "yellow" and "green" are where the vertical wires connect, and the "red" and "blue" spots on the header are where the horizontal connect. Are my assumptions correct?

Thanks!

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I have to cobble together a 19" K7000 with a likely compatible tube (based on the yoke Ohm readings, at least). The pin headers on the donor TV chassis are different than what's on the k7000 chassis, so I ordered the appropriate connectors and pins to swap the connectors out on the yoke wires.

The color scheme of the yoke wires is different as well, so I checked the Ohms on the yoke and determined which was the horizontal and which was the vertical. What I am unsure of is the pinout for the yoke connection on the K7000, meaning I don't know which pins are for vertical and which are for horizontal.

Looking at the schematic, I am ASSUMING that the pins marked "yellow" and "green" are where the vertical wires connect, and the "red" and "blue" spots on the header are where the horizontal connect. Are my assumptions correct?

Thanks!

View attachment 846398
Thats correct yellow/green vertical, red/blue horizontal. They also need to be in the correct order or the image will be reversed or upside down, however you can just cut the plug in half or use 2 two pin plugs instead that way you can use it in a mirror game or you could use any of the wg k7400 series chassis on the tube as well there yoke pins are separated in pairs.i always forget which way they go so I take a marker and mark on the plugs so i know that side toward the back/me and i just always remember yellow and green go to the left side of k7000 but they go on the right side of a 7400 series.
 
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Red and Blue are the standard color combination for horizontal. Yellow and green are the standard color combination for vertical. The horizontal pins should be the ones closer to the neck and the vertical pins are the ones closer to the front of the tube.

Reversing red and blue, or yellow and green, won't cause any damage but it will give you a picture that is mirrored and/or upside down.

Regarding the resistance readings on the yoke, it's better than nothing, but inaccurate. The 19k7000 uses a yoke that has horizontal impedance reading of 1.6 mH at frequencies from 100Hz to 10KHz. The vertical impedance is 30.6 mH from 100hz to 10KHz. The horizontal coil resistance between those frequencies jumps from 1.6 ohms to 3.5ohms. For the vertical side of things it's 13.6 ohms to 165 ohms. What I'm getting at is don't trust the resistance readings that you get from the yoke. If you get lucky and it happens to work then thank whatever god you believe in. If you get the resistances you are looking for and the tube still does not work well with the chassis then don't be surprised.

The reason I'm writing all of this is because I spent a year looking for problems with my chassis because five different brands and models of tubes that I hooked up to my 19k7000 could not go wide enough with the raster. I was sure I still had a problem with my board. I eventually bought an original yoke and an LCR meter. Even though all of the resistance readings on the horizontal coils were close enough to what the Internet said is a good reading, they were two to three times the actual impedance used by the 19k7000 chassis.

I wish you luck in your search. Never give up.
 
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Red and Blue are the standard color combination for horizontal. Yellow and green are the standard color combination for vertical. The horizontal pins should be the ones closer to the neck and the vertical pins are the ones closer to the front of the tube.

Reversing red and blue, or yellow and green, won't cause any damage but it will give you a picture that is mirrored and/or upside

With this tube the colors for the yoke wires don't follow the standard, and truth be told I don't ever trust wire colors alone for deciding what's what. That's why I manually checked it with an Ohm meter to verify which set is V and which set was H. I just wasn't sure if which set of pins on the chassis were which. I assumed since the schematic showed the green/yellow pair closest to a vertical adjustment pot, that these were the vertical pins on said pinheader.
 
Red and Blue are the standard color combination for horizontal. Yellow and green are the standard color combination for vertical. The horizontal pins should be the ones closer to the neck and the vertical pins are the ones closer to the front of the tube.

Reversing red and blue, or yellow and green, won't cause any damage but it will give you a picture that is mirrored and/or upside down.

Regarding the resistance readings on the yoke, it's better than nothing, but inaccurate. The 19k7000 uses a yoke that has horizontal impedance reading of 1.6 mH at frequencies from 100Hz to 10KHz. The vertical impedance is 30.6 mH from 100hz to 10KHz. The horizontal coil resistance between those frequencies jumps from 1.6 ohms to 3.5ohms. For the vertical side of things it's 13.6 ohms to 165 ohms. What I'm getting at is don't trust the resistance readings that you get from the yoke. If you get lucky and it happens to work then thank whatever god you believe in. If you get the resistances you are looking for and the tube still does not work well with the chassis then don't be surprised.

The reason I'm writing all of this is because I spent a year looking for problems with my chassis because five different brands and models of tubes that I hooked up to my 19k7000 could not go wide enough with the raster. I was sure I still had a problem with my board. I eventually bought an original yoke and an LCR meter. Even though all of the resistance readings on the horizontal coils were close enough to what the Internet said is a good reading, they were two to three times the actual impedance used by the 19k7000 chassis.

I wish you luck in your search. Never
Hmm you must of had bad luck with potential donors in my experience the k7000 is pretty versatile and works well with most tubes from the 90s to 2000s or ive just been lucky with sometimes having to change the width cap. I dont have an LCR so ive had to just do the ballpark shotgun off the resistance. I did blow a HOT on a k7000 because someone put a pentranic dual res tube in a WG frame for reason unknown lmao. It did work for a bit thought and had a great picture.
 
Hmm you must of had bad luck with potential donors in my experience the k7000 is pretty versatile and works well with most tubes from the 90s to 2000s or ive just been lucky with sometimes having to change the width cap. I dont have an LCR so ive had to just do the ballpark shotgun off the resistance. I did blow a HOT on a k7000 because someone put a pentranic dual res tube in a WG frame for reason unknown lmao. It did work for a bit thought and had a great picture.
Yep, horrible luck. I hear that the 25k7000 are really easy to find a donor for. They are very forgiving. The 19k7000 is not so forgiving.
 
Ahh my mind didnt read the 19" part my fault lol its Friday been drinking. If I remember some 19k7000s also had a different neck pin out. My guess it was getting harder to find 19" tubes because 25" was becoming the standard in most games at the time, and well TVs with even 25" being small at the end lol.
 
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dudes, I've seen some janky wire arrangements on Neo Geo cabinets, but I had one where whoever wired the yoke actually reversed the whole wire colors. and I don't even understand how that could happen, it's not like SNK or 3Koam makes the monitors. like the brown/yellow was horizontal, and red/blue was vertical. a lot of haunting moments of my past missions have been brought to light this week.
 
dudes, I've seen some janky wire arrangements on Neo Geo cabinets, but I had one where whoever wired the yoke actually reversed the whole wire colors. and I don't even understand how that could happen, it's not like SNK or 3Koam makes the monitors. like the brown/yellow was horizontal, and red/blue was vertical. a lot of haunting moments of my past missions have been brought to light this
Somebody was hungover at work like the other day when for some reason i decided to install 3 caps backwards on a 7400 series when they are the easiest of any chassis to determine which side is negative 🙃 luckily i double checked it first lmao. From what ive read depending on the brand the tubes were made like everywhere europe, asia, even California so cant blame China Lol
 
Somebody was hungover at work like the other day when for some reason i decided to install 3 caps backwards on a 7400 series when they are the easiest of any chassis to determine which side is negative 🙃 luckily i double checked it first lmao. From what ive read depending on the brand the tubes were made like everywhere europe, asia, even California so cant blame China Lol
I was talking about K7000s, but right on
 
I was talking about K7000s, but right on
What i meant was red and blue being vertical had to be a human fuck up lol, i cant see it intentionally being built that way, brown and yellow and yellow and white ive seen before for the vertical idt ever the horizontal.
 
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