YOKE
Q20:
+155
'--
...JT
C216
ACTIVITY
DESCRIPTION
INITIAL
CONDITION
1
0202
OF
F,
2 CURRENT THROUGH YOKE AT ZERO.
3 C216 CHARGED
TO
+155V
ACTION
0202
TURNED
ON;
2 CURRENT STARTS FLOWING THROUGH YOKE SUPPLIED
BY CONSTANT
VOLTAGE
AT
C216;
CURRENT INCREASES IN
LINEAR
FASHION THROUGH
YOKE, DEFLECTING BEAM
TO
RiGHT
OF
THE SCREEN;
4
INDUCTIVE
ENERGY ISSTORED IN YOKE;
5 C213 IS GROUNDED BY
SATURATED
0202.
Figure
8-9
Horizontal
Trace:
Scan
from
Center
to
Right
Side
of
Screen
(T0
Time)
ACTIViTY
DESCRiPTION
iNITIAL
CONDITiON
1
0202
SATURATED;
2 CURRENT THROUGH YOKE AT
MAXIMUM,
3.
C216 CHARGED TO
OV
0202
TURNED OFF.
2.
YOKE CURRENT CONTINUES FLOWING DUE TO
INDUCTIVE
INERTIA
AS
STORED
MAGNETIC
FIELD
COLLAPSES.
3 C213
OUICKL
Y CHARGES
TO
HIGH
VOLTAGE;
4 HIGH VOLTAGE
AT
C213 CAUSES FAST REDUCTION IN
CURRENT FLOW THROUGH YOKE.
CRT BEAM
IS
OUICKL
Y MOVED TO CENTER
OF
THE SCREEN
iTOI
Figure
8-10
Horizontal
Retrace:
Move
to
Center
from
Right
Side
(Tl
Time)
8-9
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