Onkyo TX-SR604 Service Manual page 83

IC BLOCK DIAGRAMS AND TERMINAL DESCRIPTIONS -23
Q4004: LC74763-9836 (On-Screen Display IC)
BLOCK DIAGRAM
CS
8-bit latch
Serial-
and
SIN
parallel
command
converter
decoder
SCLK
RST
SECAM
Composite
525/625 synchro-
nization
signal
NTSC/PAL
control
3.58/4.43
VDD1
VDD2
VSS
SYNCDET
VCOIN
VCOOUT
FC
AFC
circuit
AMPIN
AMPOUT
PDOUT
SYSIN
Sync
separator
HSYNOUT
SEPC
PIN CONFIGRATION
30
1
Horizontal Vertical
character character
size register size register
Vertical
Horizontal
size size
counter counter
Sync
detector
Composite
synchronization
Timing generator
signal separator
control
VSYNOUT
26 25 24
29 28 27
LC74763
2 5 6
3 4 7
Flashing/
Horizontal Vertical
reversal
display display
control
position position
register register
register
Flashing/
reversal
Horizontal
Vertical
control
dot counter
dot counter
circuit
Horizontal
Vertical
display
display
position
position
detection
detection
Line
Character
control
control
counter
counter
Synchronization
signal generator
Xtal IN1 Xtal IN2
Xtal OUT2
Xtal OUT1
23 20
22 21 19 18 17
8 9 10 11 12 13 14
TX-SR604/604E/8460
Display
RAM write
control
address
register
counter
Display RAM
Decoder
Font ROM
Shift register
Character output control
Background control
video output control
CVCR CVIN CVOUT
16
15