Wg k7000 cap kit questions?

[Billy]

I did a cap kit on my 25' monitor last night. The only thing I have left to do is the little flat black three legged thing (Hot maybe?).

Anyway when we pulled the neck board off of the tube. There was a little plastic sleeve in the middle of the ring. You can see it in the crappy picture below. The sleeve is broken up a little.

www.mrcade.com/5.jpg

Is this little broken sleeve a major problem? Is this going to affect my picture quality?
 

[Kevin Mullins]

Use some super glue and stick it back on.
It insures you line the correct pins up when plugging the neckboard back in.

Picture quality - nothing to do with it.
Unless you plug the neckboard in wrong, then you could have major problems.

[Ken Layton]

Yes, that's called the socket key. It is there to ensure you line up the socket with the tube correctly. Super glue usually holds this piece.

[Billy]

Okay guys ty.

Now there is some kind of paste on the black rubber anode cap. A film of some sort or maybe a grease. Should this be cleaned off or left alone or replaced?

[Kevin Mullins]

Just leave it alone.
When you put the anode cup back on, kinda smear it around a bit to get a good grip.

[Billy]

Ok kevin.. Its kinda dried up a little. Not much their. Is there something new to put in its place?

[Billy]

Here are some shots...

www.mrcade.com/10.jpg
www.mrcade.com/11.jpg
www.mrcade.com/12.jpg
www.mrcade.com/13.jpg
www.mrcade.com/14.jpg
www.mrcade.com/15.jpg
www.mrcade.com/16.jpg
www.mrcade.com/17.jpg

#17 is a shot of the two plugs on the board. You can place these either way?

The shots above are with the two plugs the other way. Meaning the wires on the out side. In this shot they are on the inside.

[Ken Layton]

In shot 17, the red six pin connector is plugged in wrong. It is reversed.

Though you have the three pin one correct.

[Billy]

Thank you Ken! We now can see it...

www.mrcade.com/20.jpg
www.mrcade.com/21.jpg
www.mrcade.com/22.jpg
www.mrcade.com/23.jpg
www.mrcade.com/24.jpg
www.mrcade.com/25.jpg
www.mrcade.com/26.jpg
www.mrcade.com/27.jpg
www.mrcade.com/28.jpg

This is the best we can get it adjusted.

[Ken Layton]

Adjust these:

Vertical height/size pot

50/60 pot 9shown here:   

http://jstookey.com/arcade/WG_25k7191/

If pic still not tall enough then replace capacitor C51 (not normally included in capkits).

You are missing a color too. Tube needs to be checked on a rejuvenator.

[Billy]

The rejuvenator will be here on Tuesday. I am going to study up on what you posted. I do have one question. Can I buy that cap locally at Radio Shack or somewhere else?

Ken thank you for all you have done. My girlfriend has been right here with me on this and she says your awesome! I must agree 100%

a+

[Ken Layton]

It's supposed to be a .68 uf @ 35 volt tantalum capacitor, however some people have used a 1 uf @ 35 volt one from Radio Shack (# 272-1434) which is about a dollar in price. The printing and polarity markings on these type of capacitors are very tiny so please use a good magnifying glass s you don't accidently put the capacitor in reverse polarity.

[Billy]

Hey Ken we did the capacitor last night. Made sure we put it in the right way. The long lead was + and the short - . We fired the cab up and it seems we lost a couple of inches on the vertical real estate.

www.mrcade.com/30.jpg

272-1434
1uf tantalum capacitor
tolerance +20%
operating temp -55 to +85 C
lead spacing .100"(2.54mm)

[Ken Layton]

Then you'll need to order the correct original capacitor (.68 uf @ 35 volt) from Bob Roberts. The value of this capacitor is critical and affects height of the picture. Of course if the vertical output IC is failing it can also affect picture height.

I have to assume you are also adjusting the vertical size/height controls too?

[Billy]

We have been adjusting the 50/60 pot like you posted above for height.

Vertical output IC? I am still a rookie so can you explain what an IC is?
People keep using that word and I can't find nothing in search to give me
an answer. However I did see on Bobs website some pictures of what might
be an IC. http://www.therealbobroberts.net/208a.jpg but I don't see nothing
that looks like that on my setup.

Where on the board is the IC? I will re order parts from Bob but half the
battle is knowing what to order. Got a pic or a number?

Here are a few snaps of the monitor with the height all the way up.

www.mrcade.com/40.jpg
www.mrcade.com/41.jpg

What else can I order just in case besides what you have suggested?

I think this time I will just send Bob extra money and let him hold it. That way when I need more parts he is already pd!

Thanks for your time...

I have a G07 in the wings with bad burn in...

[Ken Layton]

Pot VR4 is the V Size control and that's what controls the height (top and bottom) of the picture. That's the one you want to be adjusting. The 50/60 is only for if you have a slight "foldover" at the very top of the picture.

[Billy]

Mine has the remote board. So yes we have adjusted v104. In the process this morning of checking the service manual then the pots. I broke one leg of 3 on v104. Err...

Based on the schematic it looks to me that I would replace IC2 part#LA7823 because pin 8 on that chip rolls right thru C51 where the .68 uf @ 35 volt tantalum capacitor lives.

Parts list.

.68 uf @ 35 volt tantalum capacitor
IC2 aka (Integrated circuit #2) part#LA7823
New remote board
Thermal paste (not related)

Is this the correct IC to buy? Anything else Ken?

[Ken Layton]

IC3 is the vertical output IC over by capacitor C48. Be aware that there were 5 different vertical output IC's used during the production run so replace it with the same number that's in it now (like-for-like).

You could change IC2 and IC3.

Bob Roberts sells replacement pots for the k7000 remote board.

http://homearcade.org/BBBB/k7remote.html

[Billy]

Thank you Ken for all of your reply's. I have another question. How many pins should be on the end of the tube where the neckboard slips up on?

I read on 8liners.com that all 25" tubes have ten pins. If this is true then I found my problem finally because my zenith only has 9 pins.