Onkyo TX-NR901 Service Manual page 77

IC BLOCK DIAGRAMS AND DESCRIPTIONS
Q2001 LC74761M-9848(On-screen and controller)
CS
8 BITS
SERIAL
LATCH
SIN
PARALLEL AND
COMMAND
CONVERSION
DECODER
SCLK
RST
CTR-A
COMPOSITE
CTR-B
SYNCHRO-
NIZING
SIGNAL
NSDET
CONTROL
SDET
VDD1
VDD2
VSS
SYNCDET
VCOIN
VCOOUT
A F C
FC
CIRCUIT
AMPIN
AMPOUT
PDOUT
SYSIN
SYNCHRO-
NIZING
SEPARATION
SEPC
HSYN OUT
No. Symbol Description
1 VSS Ground terminal
Crystal oscillator connection terminals for.
2 XTALIN1
internal synchronizing signal generator
3 XTALOUT1
4 HSYNCOUT
Horizontal synchronizing signal output terminal
Crystal oscillator connection terminals for.
5 XTALIN2
internal synchronizing signal generator
6 XTALOUT2
7 VSYNCOUT Vertical synchronizing signal output terminal
8 CS Chip enable input terminal
9 SIN Serial data input terminal
10 SCLK Clock input terminal for serial data
11 CTR-A/SW1 Video control output terminal
12 CTR-B/SW2 Video control output terminal
13 NSDET/SW3 Selection pin for PAL or NTSC
14 SDET/SW4 Signal detection terminal
15 RST System reset input terminal
Pin 11~14: The output signal changes according to the contents of a microprocessor.
HORIZONTAL
VERTICAL
CHARACTER
CHARACTER
SIZE SIZE
REGISTER REGISTER
VERTICAL
HORIZONTAL
SIZE SIZE
COUNTER
COUNTER
SYNCHRO-
NIZING
DISCRIMI-
NATION
COMPOSITE
TIMING
SYNCHRONIZING
SEPARATION
GENERATOR
CIRCUIT
VSYN OUT
No. Symbol
16 CVOUT
17 VDD2
18 CVIN
19 CVCR
20 SYNCIN
21 SEPC
22 VSS
23 PDOUT
24 AMPIN
25 AMPOUT
26 FC
27 VCOIN
28 VCOOUT
29 SYNCDET External synchronizing signal discrimination output terminal
30 VDD1
HORIZONTAL VERTICAL ON/OFF
INDICATION INDICATION INVERSION
POSITION POSITION CONTROL
REGISTER REGISTER
REGISTER
ON/OFF
HORIZONTAL VERTICAL
INVERSION
DOT COUNTER DOT COUNTER
CONTROL CIRCUIT
VERTICAL
HORIZONTAL
INDICATION INDICATION
POSITION POSITION
DETECTOR DETECTOR
LINE
CHARACTER
CONTROL CONTROL
COUNTER
COUNTER
SYNCHRONIZING
CHARACTER OUTPUT CONTROL
SIGNAL
BACKGROUND CONTROL
VIDEO OUTPUT CONTROL
GENERATOR
XTAL XTAL
CVCR
IN2
IN1
XTAL XTAL
OUT1 OUT2
Description
Composite video output terminal
Power supply terminal for composite video signal
Composite video signal input terminal
Cromatic signal input term,inal
Video signal input terminal for internal synchronizing separation circuit
Bias output pin for internal synchronizing separation circuit
Ground terminal
Power supply output terminal for AFC circuit
Filter connection terminals
Power supply output terminal
LC resonator connection terminals for VCO
Power supply terminal
TX-NR901
INDICATOR
RAM WRITE
CONTROL ADDRESS
REGISTER COUNTER
INDICATOR
RAM
DECODER
FONT
ROM
SHIFT
REGISTER
CVOUT
CVIN