NAD T 751 Service Manual page 34

S-VIDEO BOARD
U401: LC74763-9012
CS 8
Serial
SIN 9
Parallel
Converter
SCLK 10
RST 15
SECAM 11
Composite
525/625 12
Synchron-
ization
NTSC/PAL 13
Singal
Control
3.58/4.42 14
VDD1 30
VDD2 17
VSS 22
SYNCDET 29
VCOIN 27
VCOOUT 28
FC 26
AFC
AMPIN 24 Circuit
AMPOUT 25
PDOUT 23
SYNIN 20 Sync
SEPC 21 Separator
HSYNOUT
KEY BOARD
U201: LC87F65C8A
8-bit Latch
and
Command
Horizontal Vertical
decoder
Character Character
Size Register Size Register
Horizontal Vertical
Size Size
Counter Counter
Sync
Separator
Timing Generator
Horizontal
Display
Position
Detection
4 7
VSYNOUT
Horizontal Vertical
Display Display
Position Position
Register Register
Horizontal Vertical
Dot Dot
Counter Counter
Horizontal Vertical
Display Display
Position Position
Detection Detection
Character Line
Control Control
Counter Counter
Synchronization
Signal Generator
2 3 5 6
XTALIN1 XTALIN2
XTALOUT1 XTALOUT2
44
Flashing/
Display RAM Write
Reversal
Control Address
Control
Register Counter
Register
Flashing/
Reversal
Control
Circuit
Character Output Control
Background Control
Video Output Control
19 18 16
CVCR CVIN CVOUT
Display
RAM
Decoder
Font
RAM
Shift Register