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Service manual SC-150
-18-
4 - IC description
4-1 VCT383XA TV signal processor - Teletext decoder with embedded 8 bit - Controller.
4-1-1- Block diagram of the VCT
4-1-2- TV-signal Processor
Four composite video inputs, two S-VHS inputs
Analogue YC r C b input
Composite video monitor
Multistandard colour decoder ( 1 crystal )
Multistandard sync decoder
Black-line detector
Adaptive 2H comb filter Y/C separator
VIN
VRT
SGND
VSUPAF
GNDAF
VSUPD
GNDD
VERT
EW
PROT
HOUT
HFLB
SENSE
RSW
GNDM
VRD
XREF
Video
Front-end
Comb
Filter
Color
Decoder
Panorama
Scaler
Display
Processor
Pict. Improv
Video
Back-end
Audio
CIN
VOUT
4
22 2
3
4
2
2
3
3
RGBOUT
SVM
RGBIN
VSUPAB
GNDAB
AOUT
AIN
I
2
C
I
2
C Master
I
2
C
MSync
Color, Prio
VSync
8-bit PWM
14-bit PWM
15:1 Mux
10-bit ACD
2 Timer
2 CapCom
96 kB
CPU ROM
ADB, DB, CB
16 kB
Text
RAM
3 kB
OSD RAM
TPU
Video
24 kB ROM
31
12
1 kB
CPU RAM
CPUDMA
8
BE
RDY
Watchdog
24 IO Ports
RESQ
TEST
XTAL1
XTAL2
CLK20
CNDP1
VSUPP1
Pxy
GNDS
VSUPS
Clock
Oscillator
Reset
Logic
VCT 38xx