Mitsubishi Diamond Plus 93SB - Vertical Deflection Circuit; Introduction

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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
Equivalent circuit
(Fig. 3.3.1) Introduction
Vi1(Vout2)
-
R405
6.8kΩ
+
5
R409
6.8kΩ
R410
3.0kΩ
R406
3.0kΩ
V_DY
r(DY)
R407
1.2Ω
1W
Vi2(Vout1)
Vref2
Vref1
Vout
V_DY
Vout1(From U501 13pin)
Vout2(From U501 12pin)
1
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