NOTE: The temporary wedges
may need to be. moved during
adjustments.
4. Insert three rubber wedges to
the position as shown in Fig. 13
to obtain the best circumference
convergence.
NOTE:
1. Tilting the angle of the yoke up
and down adjusts the crossover
of both vertical and horizontal
red and blue lines. See Fig. 14 (a)
and (b).
2. Tilting the angle of the yoke side·
ways adjusts the parallel conver-
gence of both horizontal and
vertical I ines at the edges of the
screen. See Fig. 15 (a) and (b).
3. Use three rubber wedges (thick
and thin rubber wedges are used
for a purpose).
4. The angle of each rubber wedge
is shown in Fig. 13.
5. After three rubber wedges have
been inserted, pull out the
temporary wedge.
6. Fix the rubber wedges with chlor-
oprene rubber adhesive.
ELECTRO HOME
Static and Dynamic Convergence
NOTE: Static convergence is
achieved by four magnets located
on the neck, nearest the base of
the picture tube, Fig. 8. The middle
pair of magnetic rings are adjusted
to converge the blue and red cross
hatch lines. The rear pair of con-
vergence rings (closest to the base
of the picture tube) are adjusted to
converge the magenta (blue/red)
to the green crosshatch lines.
Dynamic convergence is achieved
by tilting the deflection yoke up-
down and left-right.
5. Rotate the 4-pole (middle) pair of
magnets as a unit to minimize
separation of the red and blue
crosshatch lines around the
center of the screen (Fig. 18).
Variation of the angle between
the tabs adjusts convergence of
red and blue. (Tilt yoke as required
to converge red and blue at the
edges as in 3 above.)
6. Turn on green input to obtain
magenta (red/blue) and green
crosshatch lines. Rotate the 6-
pole (rear) pair of magnets as a
unit to minimize separation of
the magenta and green lines(Fig.
19). Vary angle between the two
tabs and further rotate as a unit
to finalize.
7. When convergence of 3 colors is
optimized (static in center and
dynamic around edges), apply
stripe of paint or nail polish to
convergence magnet rings to
prevent movement. If applicable,
tighten locking ring carefully.
8. Remove temporary wedge from
yoke. Tilt yoke in up-down and
left-right direction for best cir·
cumference convergence and
install 3 wedges. (It is best to use
3 new wedges since they have
adhesive backing. Simply pull off
tape, slide wedge in place and
press outer flap down firmly. For
more permanency apply small
quantity of silastic or similar
material at junction of wedges
and picture tube. Do not disturb
while material is setting. (Order
wedges by part number 39·
1233-01).
ArounCI~
-··· v••ue
L
Let the red and blue hnes come
1n
hne by
turn,ng two •-pole magnets
Figure 18
(FRONT VIEW)
_)
'-
Let the green and magenta lines come ,n line
by turning two 6•pole magnets
Figure 19
(REAR VIEW)
Rough1y 11CfIust the circumter.-,11al con-
we, .. nce 1nd install one ..-ctge temporarily
Figure 20
Rtd
-, GrNn Slut
'
·, __.,
,,
t
/
.,.,._ -. ~
Reel•
1
,.,.
,,
GrNn•
2. Switch generator to the cross-
hatch pattern.
4. Turn off green input and turn on
the red and blue input.
r
(FRONT VIEW)
1. Ensure that the controls misad·
justed during purity setup (screen,
cut-off, etc.) are set to give white
balance.
3. Adjust convergence around the
edges of the picture tube by tilting
the yoke up-down and left-right,
and temporarily install one wedge
at the top of the yoke or in a more
optimum position. (Figs. 20, 21,
22)
!FRONT VIEW)
--~
,J
" ....
Gr~
\./
'-
Rtd
-- "·-- .. , ...
·GrNn
_)
Blue
Rtc1
Ti1Uf'l9 the yoke upw.rd will move the 1tne1
.. lhc)wn with the arrows.
This 4-part series is authored by
Kevin Moeller, Field Service for
Bally MidwaY, Franklin Park, Illinois.
.
Figure 21
(FRONT VIEW)
A.P'f" Btve
''"'
'~" ....
+ ' --------' '
......• -- ..
Blue
t-:tt--------tt-f•GtNn
Red
T,11,,. ,,_
yokt
ID,,_,,..., w,11 -
the
,,,., at tflOWfl wut\ the arrows
Figure 22