Service manual

General Description
Introduction
The VCT 49xxI is an IC family of high-quality single-
chip TV processors. Modular design and deep-submi-
cron technology allow the economic integration of fea-
tures in all classes of single-scan TV sets. The
VCT 49xxI family is based on functional blocks con-
tained and approved in existing products like
DRX 396xA, MSP 34x5G, VSP 94x7B, DDP 3315C,
and SDA 55xx.
Each member of the family contains the entire IF,
audio, video, display, and deflection processing for 4:3
and 16:9 50/60-Hz mono and stereo TV sets. The inte-
grated microcontroller is supported by a powerful OSD
generator with integrated Teletext & CC acquisition
including on-chip page memory.
Fig.:Single-chipVCT49xxI
Features
The VCT 49xxI family offers a rich feature set, cover-
ing the whole range of state-of-the-art 50/60-Hz TV
applications.
– PSSDIP88-1/-2 package
– PMQFP144-2 package
– Submicron CMOS technology
– Low-power standby mode
– Single 20.25-MHz reference crystal
– 8-bit 8051 instruction set compatible CPU
– Up to 256 kB on-chip program ROM
– WST,PDC,VPS,andWSSacquisition
– ClosedCaptionandV-chipacquisition
– Up to 10 pages on-chip teletext memory
– Multi-standard QSS IF processing with single SAW
– FM Radio and RDS with standard TV tuner
– TV-sound demodulation:
• all A2 standards
• all NICAM standards
• BTSC/SAP with MNR (DBX optional)
•EIA-J
– Baseband sound processing for loudspeaker chan-
nel:
• volume
• bass and treble
• loudness
• balance
• spatial effect (e.g. pseudo stereo)
• Micronas AROUND (virtual Dolby optional)
• Micronas BASS
– CVBS, S-VHS, YC
r
C
b
and RGB inputs
– 4H adaptive comb filter (PAL/NTSC)
– multi-standard color decoder (PAL/NTSC/SECAM)
– Nonlinear horizontal scaling “panorama vision”
– Luma and chroma transient improvement (LTI, CTI)
– Non-linear color space enhancement (NCE)
– Dynamic black level expander (BLE)
– Scan velocity modulation output
– Soft start/stop of H-drive
– Vertical angle and bow correction
– Average and peak beam current limiter
– Nonlinear and dynamic EHT compensation
– Black switch off procedure (BSO)
Video & Sound IF
DRX 396xA
Audio Processing
MSP 34x5G
Video Processing
VSP 94x7B
Control, OSD, Text
SDA 55xx
Display & Deflection
DDP 3315C
VCT 49xyI
CIRCUIT DESCRIPTIONS