INSTALLATION AND SERVICE INSTRUCTIONS
NOTE:
All
of
the following procedures have been performed at the factory
and should require no further attention.
If
the monitor
is
serviced for
any reason. it should be observed afterwardto determine whetherany
of
these procedures need to be performed again.
OUTLINE
OF
CONVERGENCEANDSET-{JPPROCEDURE
DEGAUSSING: Demagnetize the shadow mask and all surrounding
metal parts with
an
external degaussing coil.
PURITY: Adjust the purity magnets and the yoke position.
STATIC CONVERGENCE: Converge Red and Blue on Green
in
the
center
of
the screen.
DYNAMIC CONVERGENCE: Converge Red and Blue at the edges
of
the screen.
WHITE BALANCE: Set Gray and
White
brightness tracking.
NOTE: Purity and convergence adjustment interact.
DEGAUSSING
The
monitor
is
equipped with an automatic degaussing circuit. How-
ever, if the CRT shadow mask has become excessively magnetized,
it may be necessary to degauss it with a manual coil. Do not switch
the coil OFF while the raster shows any effect from the coil.
COLOR
PURITY
ADJUSTMENT
1 For best results, it
is
recommended that the purity adjustment be
made in thefinal monitorlocation.
If
the monitorwill be moved, per-
form this adjustment with
it
facing west or east. The monitormust
have been operating
15
minutes prior to this procedure.
2
On
picture tubes with a 22.5 mm neck diameter. set the ring as-
sembly on the
CRT
neck with the center line
of
the purity ring-pair
over the gap between grids No. 5 and
6.
See Fig.
2A
[For picture
tubes with a 29 mm neck, use the gap between grids No. 3 and
4.
Fig.
2B.]
3 Make certainthat the magnetic ring-pairs are
in
theircorrect start-
ing positions before beginning this procedure. The correct starting
position for the purity ring-pair is not necessarily the one shown in
Figure
2.
The correctstarting position will vary from ring assemblies
from one manufacturer
to
another.
It
will be necessaryto determine
the
correct starting
position-also
known
as
the zero correction
position.
Figure 2 shows a ring assembly in which each
of
the rings of the
purity ring-pair has two
tabs-one
long and one short.With some
ring assemblies
of
this type, the zero correction position
is
with the
long
tab
of
one ring aligned with the short
tab
of
the other ring.
On
other
ring assemblies
of
this type, the zero correction position
is
with the long tab
of
one ring aligned with the long tab
of
the other
ring.The way to determine which
is
which is by trying one
of
these
orientations and then rotating the two rings together, as a pair.
without
changing theirorientation with respectto each other.
If
this
rotation
of
the ring-pair causes no change in
the,
purity, then it
is
the
zero correction position.
If
the purity does change, then try the
other
orientation.
A third type
of
ring assembly has only one tab on each
of
the
two
purity rings.The zero correction position forthistype
of
assembly
is
with the tabs
of
the
two
purity rings aligned with each other and
pointing up toward the anode
contact
of
the
CRT.
Thecorrectstarting positionsforthe
other
ring pairsare
as
shown in
Figure
2.
For the other
type
of
ring assembly (not shown). the cor-
rect starting position for the
other
two ring-pairs
is
with all
of
the
tabs aligned with each
other
and pointing up, toward the anode
contact
of
the
CRT.
4 Vertical raster position control must be at the center
of
its rotation.
5 Remove the R-G-B signal from
the
monitor
.
6 Turn
theGreen
Cut
off
Control(VR203) on
theNeckBoard
fully
CW.
(See Fig.
1).
7 Turn theRed andBlue
Cut
off
Controls
(VR201
&VR205) fullyCCW.
8 Pull the Deflection Yoke backward so
that
the Green belt will ap-
pear. (See Fig.
4)
.
5
p
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s
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T
I
0
N
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0202
0203
R208
0204
/
R209
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P456
VIDEO
NECK
BOARD
FIG.3A
PURITY
ANO
J_
CONVERGENCE
~~!;;;;;;;:~~
PURITY ADJ.
RING
ASS'Y
; R Ji REO/BLU ADJ.
~NHGO~o
1
~ii6~RT-
t:
::i
~REO/BLU
ON
GREEN
ADJ.
TOP
VIEW
RED/BLUE
ON
GREEN~
10
O'CLOCK
V"
\
RED/BLUE
I 2
O'CLOCK
FIG.
2A
TOP
VIEW
REAR
VIEW
REAR
VIEW
--
~~~~-f-
NO.
3
AHO
4)
P
0
s
I
T
I
0
N
I
LR207
~
R208
FIG.
38
l
P448
VIDEO
NECK
BOARD
~=
PURrr'
m.
F¥&
;s~:::;
RED/BLUE
ON
GREEN
10
O'CLOCK
RED/BLUE
2 O'CLOCK
PURITY
3 O'CLOCK
GREEN
BELT
CONCENTRIC
CONVERGER ASSY.
SHOWN
IN
ZERO
CORRECTION POSITION,
FIG.
28
TEMPORARILY
INSTALLED
GE
y
5825
FIG. 4
RED
BLU
GRN
RED
