Tandy CM-8 - Dynamic Convergence

11. Dynamic Convergence (Figs. 17 -19)
Dynamic convergence (convergence of the three color
fields at the edges of the CRT screen) is accomplished
by proper insertion and positioning of three rubber
wedges between the edge of the deflection yoke and
the funnel of the CRT .
This is accomplished in the following manner:
1. Switch the display monitor ON and allow it to warm
up for 15 minutes.
2. Apply the crosshatch pattern (Fig. 14) from the
computer to the display monitor. Observe spacing
between lines around the edges of the CRT .
3. Tilt the deflection yoke up and down . Insert tilt ad-
justment wedges G) and 0 between the deflec -
tion yoke and the CRT until the misconvergence
illustrated in Figure 17 has been corrected .
4. Tilt the deflection yoke right and left. Insert tilt ad-
justment wedge Q) between the deflection yoke
and the CRT until the misconvergence illustrated
in Figure 18 has been corrected .
5. Alternately change the spacing between , and depth
of insertion of , the three wedges until proper dy -
namic convergence is obtained .
6. Check pur i ty and readjust, if necessary.
20
'
GREEN
~ /..._RED
BLUE.-.! /-- (BLUE)
(RED) / BLUE(RED).
1---------
I' -rGREE~
I \ RED (BLUE)
..,.1.;
---
\
Figure 17. Dynamic Convergence A
'
I
.. .
I
I
I
BLUE
(RED)
i---------s
I t RED
: (BLUE) :
1 +i .. I
I
I RED I
~(BLUE)~ I
l _i. __________ I
BLUE
(RED)
'
!.
I
I
'
I
Figure 18. Dynamic Convergence B
DEFLECTIOI\
YOKE
Figure 19. Deflection Yoke Rear View