Macintosh Classic II - screen adjustments

[macintosh2002]

Hello,
could some let me know how to adjust my Classic II screen? It should rotate a little bit counter clockwise. I think this should be done by the plastic rings on the backside of the CRT, but I don't want to break something. Is there a manual / description to adjust the screen? Cut-off, width, height can be done with Larry Pinas Repair and Upgrade Secrets, that's not the problem.
Thank you.

 

[SuperSVGA]

You can use the official service manual - https://tim.id.au/laptops/apple/legacy/classic_ii.performa_200.pdf

Specifically you would want the procedure at PDF Page #107, or Page 18 of the Adjustments section.

 

[rollmastr]

You will have to loosen and rotate the Yoke of the CRT. Beware of the high voltage and stuff.

 

[macintosh2002]

Thank you, that was easier than I thought, it is much better now!

 

[68kPlus]

*flashback to me trying this and cracking the CRT neck*
Luckily I don't think it was me, I think it was already super weak due to being shipped 1400km+

 

[jessenator]

If you have the means, I highly recommend a 3D printed set of channel lock pliers. After you loosen the screw clamp on the crt yoke, you can rotate said yoke while the Mac is on to get the position just right. Just don't grip it on the coils! Hopefully you don't have to, but they can also be used on the beam magnets.

All the same, do this at your own risk!! Super high voltage is no joke. I wore an insulating glove on top of all that just because.