Vertical Output; Horizontal Driver Circuit; Horizontal Output Stage; Flyback Transformer - Philips C500 Service Manual

6.8

VERTICAL OUTPUT

IC U601(STV 9302A) is the vertical amplifier IC, the output pin5 connect to the YOKE .The sawtooth
current float across the YOKE to make vertical deflection. Fig. 4 is the block diagram of IC
STV9302A.
Block Diagram
6.9

HORIZONTAL DRIVER CIRCUIT

The driver pulse that come from U401 pin26 drive Q506, then transformer T501 convert driver pulse
to driver current to drive horizontal output transistor Q801.

6.10 HORIZONTAL OUTPUT STAGE

There is different Cs value in different horizontal frequency.
Hf<40KHz
Hf>40KHz

6.11 FLYBACK TRANSFORMER

In the primary of F.B.T , there is about 1050Vpp in the LC resonant interval, it convert to the
secondary of F.B.T to produce about 24.5KV for CRT anode voltage. The other bias for CRT is
G4(4~8KV), G2(0~1000V) and G1(-150V).

6.12 VIDEO PRE. AMP.

The video pre-amp IC is U201(NT6812). The input signal is 0.7Vpp, then pre-amp IC U201 amplify
the video signal to 2.4~3Vpp. The WHITE BALANCE and CONTRAST shall be adjusted by
adjustment the bias voltage of U301. Fig. 5 is the block diagram.
Hf Cs
C804+C805
C804
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