[ 1995Sl Autosync Deflection Controller Circuit ]; [ Vertical Deflection ] - Mitsubishi Electric Diamond View 1995SL Service Manual

Crt monitor

5SL CRT Monitor Service Guide

Chapter 2 Circuit Operation Theory

[ 1995SL Autosync Deflection Controller Circuit ]

The auto-sync deflection control circuit is shown as fig. R214 and R215 are known as RHBUF and RHREF

which determine fmax and fmin of the horizontal oscillator. For 98e, free-run mode is 28.5KHz and the

frequency range is from 31KHz to 86KHz.

TDA8351 vertical deflection booster is proper for TDA4856 auto-sync deflection IC. This vertical output circuit is

shown in fig. This vertical driver IC circuit is a bridge configuration. TDA4856 differential output signals VOUT1

and VOUT2 are connected to TDA8351 pin1 and pin2 via DC-couple. The vertical coil is connected between the

output amplifier pin4 and pin7, which are driven in opposite phase. TDA8351 can output current 2.8Ap-p

maximum to drive VDY. It can be calculated by:

IR226*R226 = Icoil*R228

So it will be easy to control Icoil by R226 and R228. R229 is used for thermal compensation for Vsize.

VO(GUARD) at pin8 is used for vertical blanking of the picture tube screen. It is inverted by Q201 to get a 40Vp-

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