Vertical Output Amplifier Circuit - NEC MultiSync FP1370 Service Manual

pin4 (Q421 Gate)
pin18 (Q422 Gate)
pin19 (Q422 Gate)

3) Vertical output amplifier circuit

The current proportional to the input voltage to IC401 is supplied to the vertical deflection coil (V-DY).
The vertical deflection current is taken as voltage wave form on R406 and fed back to IC401.
V SAW Input
5V
0V
5V
0V
5V
0V
Vertical frequency (Hz)
(Fig. 2.12) IC532 output voltage
R404
R403
⑥
－
⑤
＋
R401
② ⑦
-15.6V
+14.5V
(Fig. 2.13) Vertical output amplifier circuit
55 70 90 105
V-DY
IC401
③
Pump Up 2
⑩ ⑨
④
Pump Up 1
⑧
8-16
130 160
R406