Toshiba CF35E50, Technical Training Manual

Page: 64 / 139

64
1. OUTLINE
As can be seen from the block diagram, the sync circuit and
the V trigger circuit are contained in Q501 (TA1222N), and
the sawtooth generation circuit and amplifier (V drive circuit)
contained in Q302 (TA8859AP). The output circuit and
pump-up circuit circuits are included in Q301 (TA8427K).
Fig. 10-2
1-1. Theory of Operation
The purpose of the V output circuit is to provide a sawtooth
wave signal with good linearity in V period to the deflection
yoke.
When a switch S is opened, an electric charge charged up to a
reference voltage VP discharges in an constant current rate, and
a reference sawtooth voltage generates at point a. This voltage
is applied to (+) input (non-inverted input) of an differential
amplifier, A. As the amplification factor of A is sufficiently
high,
a
deflection current flows so that the voltage V2 at point
C becomes equal to the voltage at point a .
Fig. 10-1 Block diagram of V deflection circuit
31
15
14
13
3
6
8
7
6
4
1
5
2
3
C322
R329
Q501
C321
R320
Q302
+9V
D309
+27V
R301
R330
C319
C314
Q301
Q312
Q311
R309 C308
D301
C313
R303
L301 R336
R307 L462
R306
R313
C306
R344
+27V
R305
C305
R304
C307
Vp
S: Switch
Differential
amplifier
C2
R3
V2
c
R1 C2 R2
a
V1
L