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6 DEFLECTION
A. SYNC PROCESSOR
H-sync & V-sync or input to U1 (u-P), then u-P output the H-out & V-out to U401 (TDA4856).
B. HOR. PROCESSOR & VERT. PRE-AMP
Fig.2 is the block diagram of IC TDA4856.
Hor. processor
The H-out that come from u-P will input to the pin 15 of U401, it will be compared with the
oscillator sawtooth voltage by the PLL1 (pin 26) phase detector, After that, it will be compared
again with the flyback pulse (pin 1) by the PLL2. The PLL2 detector thus compensates for the
delay in the external horizontal deflection circuit by adjusting the phase of the HDRV (pin 8)
output pulse.
+B control
The U401 pin 5 to pin 3 is operation Amplifier from pin 11 EW DRV parabola amplitude DC, H-
Size and Trapezium correction wave from connection, pin 6 is forward PWM output, driver the
Q420, Q422 all mode +B is 198V
Vert. Pre-amp
Vertical oscillator will be trigged by V-out (pin 14). It is available to get sawtooth waveform in
pin 24. V-center, V-amp and V-linearity can be adjusted by I
output driver is come from pin 12 and 13.
C. VERTICAL OUTPUT
IC U601 (TDA4863A) is the vertical amp IC, the output pin 5 connect to the YOKE .The
sawtooth current float across the YOKE to make vertical deflection. Fig.3 is the block diagram
of IC TDA4863A
D. HORIZONTAL DRIVER CIRCUIT
The driver pulse that come from U401 pin 8 drive Q417, Q416, TO Q503,then transformer T501
convert driver pulse to driver current to drive horizontal output transistor Q504.
2
C bus from U1. The vertical
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