[Krankshaft]

Focus is typically adjusted in one of two ways electrostatic focus (on the HV block) and mechanical focus.

Focus usually doesn't need to be touched unless components have aged causing the focus voltage to drop.

Focusing the red and green is no problem however focusing the blue is a compromise between blooming and defocusing so your better off not messing with the focus unless you either remove the tubes or replace the flyback or HV block.

As for an optics cleaning that is something that you can do and can improve picture quality greatly if there is alot of dust on the optics.

I just did my 2003 Toshiba after a convergence amp replacement. There was plenty of dust in there.

Loosen all of the screws holding the screen bezel in place and remove it carefully noting any connectors that need to be disconnected.

Then loosen the screws securing the 3 lenses to the tubes (don't mix them up).

Then using a dry microfiber cloth wipe the top and bottom of the lens and don't forget to wipe the glass directly underneth the lens where it was mounted.

Don't forget to clean the rear of the screen too.

The microfiber did a good job of dusting without any liquid but if you must using something use rubbing alcohol or camera lens cleaner. Be careful since the projection lenses are plastic.

Whatever you do DO NOT loosen any bolts with springs on them those seal in the coolant.

As for convergence most TVs have a built in crosshatch pattern in service mode.

Turn off the red and blue tubes leaving the green grid showing.

Then using a convergence grid available from the manufacturer align the green tube crosshatch to the grid. Then align the red and blue to the green. You can eyeball it but don't expect a perfect conergence without a grid.

After the congergence is to your liking its time to save the settings to touchfocus or magicfocus or whatever your TV has to record the convergence settings. To do this you normally hit a number on the remote then hit the touchfocus button and the convergence settings are saved in memory.

As for the specific steps to call up service mode and such they vary I would recommend getting a service manual for your set they explain how to get into service mode and how to manipulate the points.