Try the focus pot on the back of the HV multiplier. Most of the time
the multiplier is part of the flyback transformer assembly.

The focus at the extreme sides of the CRT may not be as sharp as in
the centre. When adusting the focus you may have to compromise for
this. This error has to do with the accuracy of the dynamic focus.
Also, as the CRT becomes weaker with age, the dynamic focus spec will
change.

What I like about the LCD monitors is that there are no convergence,
purity, or focus errors.


Jerry G.






On Dec 25, 4:41*pm, s wrote:
hi there, after 5 years of troubl free operation my monitor started
giving me loss of color problems,so i pulled off the pcb on the crt
and cleaned the pins with an emery cloth.

the color is back but i am noticing that in the centre of the screen
the text is less sharp(focus?) now.

i am suspecting that i switched the order of some of the long wires
which ground on the metal cage which encloses the pcb, there are 6
wires.they all connect to the same metal cage so i didnt think their
sequence was important.

could this be the problem?i didnt touch any of the yoke
adjustments.how else could i have effected screen sharpness. thx