DEC VT220 Technical Manual page 176

yOKE
ACTIVITY DESCRiPTiON
iNiTiAL CONDiTiO',
- - - - - ~
ACTJO\:
C2l3 VOLTAGE DISCHARGES THROUGH YOKE;
2 RiSE YOKE MOVES BEAM TO LEFT
SIDE OF SCREE I,
Figure 8-11
Horizontal Retrace:
Move to Left Side
from Center (T2 Time)
0200
CURRENT YOKE MAXiMUM,
C213 DiSCHARGiNG;
4 VOLTAGE ACROSS C216 EQUALS OV
INDUCTIVE INERTIA FORCES
rop
OF YOKE SLIGHTLY
NEGATiVE;
2 NEGATIVE FROM YOKE FORWARD BIASES
0200
PROVIDING PATH THROUGH C216;
3. YOKE CURRENT GRADUAlL Y DECREASES AS
MAGNETIC FiELD COllAPSES, DISCHARGING INTO C216;
4. BEAM MOVES IN LINEAR FASHiON TO CENTER OF THE
SCREEN
Figure 8-12 Horizontal Trace:
Scan to Center
from
Left Side
of
Screen
(T3 Time)
8-10