Small Signal Processing Section - Qls 21F1 Service Manual

Small Signal Processing Section

Small signal processing section is the IF (intermediate frequency) signal across saw filter send in
the pin12 and pin13 of IC201. The VIFIN signal through built-in PLL DEMOD, sound trap, video
nd
amplifier and synchronous detector processing, get the color video broadcast signal and 2 sound
IF signal.
Video signal processing section is CVBS across video filter and delay line and horizontal &
vertical synchronous separation circuit processing and get H-drive (pin56 of IC201)and V-drive
signal (pin15/pin15 of IC201).
IF sound signal across the sound-down-mixer and AM demodulator processing, send out the AVL/
SSIF OUT signal. ( Refer to Fig2 and Fig 3.)
(Fig 2. Small Signal Processing Section)