admiral 24c15 with 20b1 chassis attempt at restore

[fumplet]

Well, I installed an adjustable 10k ohm resistor and set it to 8.4k I dont know if it made a difference or not. I would think horizontal linearity would shrink sides of picture inwards or outwards and its still super wide off the screen. Also possable this leader lcg 400 test pattern generator now doesnt work but zero experience knowing what Im even looking at.

[bandersen]

Your horizontal frequency is wrong. Can't you adjust the hor. lock and hor. hold and eliminate the horizontal bars?
Adjusting lock one way should increase the number of strips and decrease the other way until they are gone.

[fumplet]

messing with horizontal lock and front switch now. Maybe they are just way out of whack. Got focus back, not certain its right but its back after sand resistor replacement of 3k.

[fumplet]

Ok jurys in on this one. Decided to hook up my leader lcg 400 to my 20 inch crt set cerca 2001.......NO PICTURE! FLipped buttons switches until picture appeared! Hooked it to this tv and we now have laid an egg. I had all the switches off on the generator, I guess luminance has to be on. Now I have to figure out how you shrunk your horizontal image to fit the screen. Maybe it takes a good amount of turns to affect the image for horizontal and vertical linearity. Also wondering since my ION magnet is practically up against the focus coil that the focus coil and the ion magnet are not in the proper adjustment. Especially the focus coil, it doesnt seem to be perpendicular to the neck of the tube.

[fumplet]

My picture runs off left side of tube.so more fiddling

[Electronic M]

The focus coil also effects centering. If there isn't additional centering controls on the set the general idea of the he focus coil is adjust for best focus, try to get centering as good as you can and avoid corners getting neck shadow from the focus coil adjustment.

The first thing I would do is adjust the vertical pots to get the vertical linear. If you can achieve that and have sound, then slide the chassis into the cabinet and adjust the sweep (and possibly focus and trap) with the cabinet mask present. The mask will tell you if you have too little or too much deflection, and if you're centered.

[fumplet]

Trying to get picture close to being centered. Focus coil, ion magnet. th control, horiz linearity. NOt having much luck yet gettting piccture to move to the right.
Messing with this quite a bit getting it to center and shrink. Controls were messed with quite a bit. Width was all the way in and hor. lin. was most of the way out. Im wondering if messing with the power resistors ohms would help me get more adjustment.

[bandersen]

Have you adjusted the horizontal drive control? It will affect width and horizontal linearity.

[fumplet]

yes I tweaked the drive as well

[bandersen]

and what affect did tweaking it make? It's a variable cap and most of the change happens when it is tight clock-wise. The width coil will only change the width maybe 10% from one extreme to the other.

If your set has a double-d mask, the image should extend slightly off screen on either side. You squares look pretty good so I'm thinking your width is just about right.
Looks more like the linearity is off a bit. More compressed on the left and stretched on the right. That is messing up your centering.

Yes, luminance needs to be on. Luminance image info is the brightness as compared to chromanance which is color info.

[fumplet]

yeah I havnt figured out what will fix the centering. Maybe check all resistors in the horizontal verticle area. HAVE noticed the drive adjustment and its effect at almost tight ness.

[bandersen]

No, that won't do anything. Please answer my questions. I'm trying to help and the more info you can provide the better.

The electron beam comes straight down the center. The only think moving it around is magnetic fields.

It looks like your horizontal linearity is off. Is that correct? Is the image more compressed n the left than the right? If so, you need to fix that before you worry about centering.

Linearity is affected by the damper tube, horizontal output tube, horizontal drive and the linearity coil.

The left side is controlled mostly by the damper circuit and the right by horizontal output circuit.

Once you get that sorted out, you center the image by adjusting the screws on the focus coil.

[fumplet]

It was more compressed to the left, wife and daughter noticed it. Ive messed with it a lot. Also not sure which pattern is best for picking out the skewed linearity issues. Set before I took out the chassis. I dont know if it has sound yet I need to hook up the speaker.

[bandersen]

Yes, that's a double D so your width is close to correct. Now I'm seeing distortion in the upper left corner. Could be yoke is not all the way forward, or ion trap misadjusted or focus coil misadjusted. My money is on the ion trap magnet.

[old_coot88]

How does regular programming look on it? That was the criterion for most any service shop back in the day. That slight bit of horz nonlinearity in your last screen shot would likely never be noticed.
The rule for ion trap adjustment is max brightness consistent with no neck shadow.