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How to tell the difference between u2000, u5000, k7400 and k7500 monitor chassis
So I wanted to order a cap kit and new flyback for the monitor in my KI2 cabinet looking at some pictures it looked like a u2000 but I soon discovered that the u2000, u5000, k7400, and k7500 are nearly indistinguishable from each other, and not only do they look nearly identical but the capkits and flybacks can be different depending on the model you've got, making for a high probability of ordering the wrong parts.
I figured out a few easy ways to tell the difference and since I had a hard time finding information on the differences I figured I'd post up a guide..
MAINBOARD:
Method 1:
Using the schematics from Wells Gardner the location of a coil near the center of the chassis is a great initial indicator:
u2000:
u5000:
k7400/k7500:
^unfortunately the k7400 and k7500 have identical board layouts so you'll need one other key to identification.
Method 2:
on the left side of the chassis board (the side with the fuse) there should be a board number that starts with a "P" this number should tell you which chassis it is:
P-717 = U2000
P-738 = U5000
P-763 = K7400
P-793 = K7500
Method 3:
Also printed on the board should be a model number that starts with "WGM" for Wells Gardner model, it will follow this format:
WGM####
the first two numbers "##" represent the tube size, 25" or 27"
the second two numbers "##" represent the chassis type as follows:
20 = U2000
50 = U5000
74 = K7400
75 = K7500
for example my number was WGM2520 meaning a 25 inch U2000
if your number was WGM2775 it would mean you had a 27 inch K7500
------------------------
REMOTE BOARD:
The remote board is the small board with all the adjustment knobs on it, that allow you to fine tune the picture on the monitor. there are some differences between remoteboards
Method 1:
just like with the main board look for the "P" number on the remote board
P-716 = U2000
P-718 = U2000 or u5000 (this remote board was used on both models)
P-790 = K7400
P-804 = K7500
Method 2:
This is pretty easy, Count the number of Potentiometers (pots). the u2000/u2000 have 8 pots, and the k7400/k7500 are missing the top left pot (h-hold) for a total of only 7 pots. This only gets you half way there.
Looking at the schematics it appears that the u2000/u5000 remote boards are, for the most part interchangeable, as are the k7400/k7500 remote boards. Don't quote me on this, as I don't have any experience with swapping these out... the minor differences are as follows:
Minor differences between the u2000 and u5000 remote boards:
some u2000 use the same board as the u5000, the ones that are different will have different values on the (non-adjustable) resistors... the older u2000 board has a 4.7K (yellow, violet, red) and 3.3K (orange orange red), the u5000 and newer u2000 boards have values of 2.2K (red, red, red) and 2.7K (red, violet, red). These resistors are used in the contrast adjustment, and could be easily swapped out if problematic.
Minor differences between the k7400 and k7500 remote boards:
the h-position pot is different between these two: the k7400 uses a 20K pot, and the k7500 uses a 10K pot. Theoretically you should be able to use the k7400 remote board on a k7500 but you may be out of adjustment range on the width and horizontal position if using a k7500 board on a k7400, this could be fixed by replacing the pot.
----------------------
NECK BOARD:
I still haven't figured out a good way to determine the differences in the neck boards myself, I'll update this post once I do.
------------------------
I was able to use all 3 methods to positively ID my chassis as a u2000. I'm sure most of this info is old-hat to some of you but I spent a couple of hours pouring through posts and images trying to figure it out, so I figured I should post it up to hopefully save someone else the headache.
If I got anything in this post wrong... please correct me... I wouldn't want to be spreading around incorrect info ;D
So I wanted to order a cap kit and new flyback for the monitor in my KI2 cabinet looking at some pictures it looked like a u2000 but I soon discovered that the u2000, u5000, k7400, and k7500 are nearly indistinguishable from each other, and not only do they look nearly identical but the capkits and flybacks can be different depending on the model you've got, making for a high probability of ordering the wrong parts.
I figured out a few easy ways to tell the difference and since I had a hard time finding information on the differences I figured I'd post up a guide..
MAINBOARD:
Method 1:
Using the schematics from Wells Gardner the location of a coil near the center of the chassis is a great initial indicator:
u2000:
u5000:
k7400/k7500:
^unfortunately the k7400 and k7500 have identical board layouts so you'll need one other key to identification.
Method 2:
on the left side of the chassis board (the side with the fuse) there should be a board number that starts with a "P" this number should tell you which chassis it is:
P-717 = U2000
P-738 = U5000
P-763 = K7400
P-793 = K7500
Method 3:
Also printed on the board should be a model number that starts with "WGM" for Wells Gardner model, it will follow this format:
WGM####
the first two numbers "##" represent the tube size, 25" or 27"
the second two numbers "##" represent the chassis type as follows:
20 = U2000
50 = U5000
74 = K7400
75 = K7500
for example my number was WGM2520 meaning a 25 inch U2000
if your number was WGM2775 it would mean you had a 27 inch K7500
------------------------
REMOTE BOARD:
The remote board is the small board with all the adjustment knobs on it, that allow you to fine tune the picture on the monitor. there are some differences between remoteboards
Method 1:
just like with the main board look for the "P" number on the remote board
P-716 = U2000
P-718 = U2000 or u5000 (this remote board was used on both models)
P-790 = K7400
P-804 = K7500
Method 2:
This is pretty easy, Count the number of Potentiometers (pots). the u2000/u2000 have 8 pots, and the k7400/k7500 are missing the top left pot (h-hold) for a total of only 7 pots. This only gets you half way there.
Looking at the schematics it appears that the u2000/u5000 remote boards are, for the most part interchangeable, as are the k7400/k7500 remote boards. Don't quote me on this, as I don't have any experience with swapping these out... the minor differences are as follows:
Minor differences between the u2000 and u5000 remote boards:
some u2000 use the same board as the u5000, the ones that are different will have different values on the (non-adjustable) resistors... the older u2000 board has a 4.7K (yellow, violet, red) and 3.3K (orange orange red), the u5000 and newer u2000 boards have values of 2.2K (red, red, red) and 2.7K (red, violet, red). These resistors are used in the contrast adjustment, and could be easily swapped out if problematic.
Minor differences between the k7400 and k7500 remote boards:
the h-position pot is different between these two: the k7400 uses a 20K pot, and the k7500 uses a 10K pot. Theoretically you should be able to use the k7400 remote board on a k7500 but you may be out of adjustment range on the width and horizontal position if using a k7500 board on a k7400, this could be fixed by replacing the pot.
----------------------
NECK BOARD:
I still haven't figured out a good way to determine the differences in the neck boards myself, I'll update this post once I do.
------------------------
I was able to use all 3 methods to positively ID my chassis as a u2000. I'm sure most of this info is old-hat to some of you but I spent a couple of hours pouring through posts and images trying to figure it out, so I figured I should post it up to hopefully save someone else the headache.
If I got anything in this post wrong... please correct me... I wouldn't want to be spreading around incorrect info ;D
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