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2) Basic Vertical drive Operation
eb
● The first half of the scanning time turns on Q3(Q4 turns off)
Vcc
PIN2 of IC301
Charge Cv by current i1
● The second half of the scanning line turns on Q4(Q3 turns off)
The discharging Cv
Discharge current (i2) flows
3) Vertical Pump-up Operation
Vcc
IC301
8
Vcc
l1 : Charge Current
l2 : Discharge Current
IC301
Q1
2
Collector of Q3
V-DY
Collector of Q4
D302
C307
i1
l2
9
Pump
up
Vertical
Trigger
2
INPUT
Vcc
8
Q3
i1
Q4
12
i2
Q2
Emitter of Q3
V-DY
Emitter of Q4(GND)
PUMP-UP
13
VOLTAGE
Vert.
12
OUT
V-DY
Cv
- 31 -
Vcc
DY INPUT
VOLTAGE
V
E
0
DY INPUT
CURRENT
11
12
V-DY
CV
2Vcc
Vcc
AFTER
HALF-PERIOD
• During after half scanning line period, the Vcc
supply current through D302 and charges
C307 to be Vcc.
• In the flyback time, (Vcc+Vcc=2Vcc) is
applied to pin 13 of IC301.
• The operation above prevent the raster at the
top of the screen from disappearing by
raising Vcc Voltage applied to the deflection
coil only driving the vertical flyback time and
quick return it to the starting point in the
flyback time.
2Vcc
Vcc
0
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