Date: 06/02/98
R9000901
R9000908
GRAPHICS
Replacement of a picture tube
14
808S
a
b
d
c
a<b
c<d
a'
b'
d'
c'
a'=b'
c'=d'
realign the electrical
and optical focus
due tu mutual influence between the
stigmators, focus and centring, it is
advised to repeat above a couple of
times
reposition the raster as
described earlier
adjust the 4-pole rings until the
defocused dots are circular.
decrease the Contrast and
Increase the Brightness to
reveal the background raster
see service sheet 'Deflection
switching/Hor Amplitude' in this
manual for the alignment of the
image width coils
Note: when only one tube has
been replaced, the image width
of one of the other tubes as a
reference, and obviously limit
the adjustment to the core of the
corresponding replaced tube
<
<
scan width
adjustment
Set the midpoint focusing
on 100
select a source that
generate a field of small
dots and crosshairs
realign the electrical and
optical focus
adjust the 2-pole magnets rings by
rotating one or both up to a point
where 'shading' of both sides of
the vertical and horizontal lines is
equal.
lower the Brightness and
put the Contrast on its max
with the RCU
Set the midpoint focusing
on 0
2-pole
4-pole
neutral
position
