Vertical Deflection Circuit; Introduction - NEC MultiSync FE001SB Service Manual

3.3 Vertical Deflection Circuit

3.3.1 Introduction

The vertical deflection circuit gains an input of vertical saw-tooth wave signals generated from the oscillator
IC501 Pin 13 Vout1 and Pin 12 Vout2. The resultant output signal is converted into a current that drives the
DY (V) through the use of the U401 (TDA8172) driven by +14V and -12V of the power supply.
The vertical deflection circuit is composed of the following blocks:
1) Saw-tooth wave generator and waveform correction circuit (U501)
2) Vertical output circuit (U401)
Circuit diagram
Vout2 (From U501 12pin)
Vout1 (From U501 13pin)
Equivalent circuit
Vi1(Vout2)
Vi2(Vout1)
R405
6.8kΩ
Vref1
Vref2
R409
6.8kΩ
R410
3.0kΩ
(Fig. 3.3.1) Introduction
1
- V_DY
5
7
+
R406
3.0kΩ
7-13
V_DY
r(DY)
Vout
R407
1.2Ω
1W