NEC VT440 Service Manual page 77

CIRCUIT DESCRIPTION
I/O Block, VIDEO Processor Block, SYNC Block
1. I/O terminals
1-1 Video input
• RCA PHONO terminal for composite video signal input (1 system)
• S VIDEO input terminal (1 system)
1-2 RGB input (Application to the component input through the conversion cable)
• Mini D-SUB 15-pin (1 system) (plug & play applicable)
1-3 RGB output
• Mini D-SUB 15-pin (1 system)
1-4 Audio I/O
• Mini jack for audio I/O (For both input and output; used in common for respective video signals)
• RCA PHONO terminal for audio I/O (For both input and output; used in common for respective video
signals)
1-5 PC CONTROL terminal
• Mini DIN-8P (1 system)
• External control applicable
2. Input signals
2-1 Signal level
• Composite video : 1.0Vp-p/75Ω
• S VIDEO input
• RGB signal
• Sync signal
• Component signal : 1.0Vp-p/75Ω (Signal Y), 0.7Vp-p/75Ω (Signal Cb/Cr, Pb/Pr)
• Audio signal
2-2 Color system applicable to video input
• NTSC3.58
• NTSC4.43
• PAL
• PAL-60
• SECAM
• B/W60, B/W50 (B/W: Black-and-white signal without burst)
2-3 Scanning frequency applicable to RGB signals
• Horizontal: 15 to 100kHz
• Vertical: 50 to 117 Hz
2-4 Component signals
• Component video Y/Cb/Cr (DVD output signal)
• HDTV 720p signal, 1080i signal, 480p signal
6-4
: 1.0Vp-p/75Ω (Signal Y), 0.28Vp-p/75Ω (Signal C burst level)
: 0.7Vp-p/75Ω
: TTL level (positive/negative)/ 1kΩ
: 0.5Vrms/47kΩ