Adjusting width of CRT picture

[mloret]

Hello. I recently installed a new analog board in my Mac 128k and the picture on the screen is too narrow. I need to adjust the width. However, I have never adjusted a CRT and I have not been able to find a good YouTube. I have read online that it can be a fraught process. I have some chopsticks I was planning to mold to fit. Question--should I undertake this or just leave it?

 

[Johnnya101]

All depends on what you want it to look like. There is the "correct" size, and what you like. I like mine to be set to the factory size, which has a black border around the image. How wide is your image? It is super easy to change it.

 

[mloret]

I guess what I'm wondering is whether I'm risking my life or in danger of destroying the computer. I haven't messed with a CRT before.

 

[Johnnya101]

Nah, you'll be fine. Just don't touch anything behind the analog board and don't use anything conductive and you'll be fine. While it's on, just rotate the width pot a little, I think it's to the right to expand it?

 

[bibilit]

If you don’t mess around with your bare fingers or metal, don’t bother too much.
The analog B is protected with a plastic shield so adjusting is pretty straightforward.

 

[mloret]

Okay. The adjustments are done on the side of the analog board with the plastic shield then, not the side with the caps, transformers, etc? Just making sure.

 

[Johnnya101]

Yes

 

[mloret]

Got it. I appreciate the guidance.