Ic Block Diagrams; Ic Pin Function Description - Sony STR-DE245 Service Manual

3-2. IC BLOCK DIAGRAMS

IC281 NJM2279 (VIDEO BOARD)
14 13 12 11 10 9 8
AMP
AMP
1 2 3 4 5 6 7
IC701, IC702 uPC2581V (MAIN BOARD)
BIAS CIRCUIT
PROTECTOR
PRE
PRE
REG DRIVE
DRIVE
DRIVE
DRIVE
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
IC501 STK350-230 (MAIN BOARD)
TR3 R1
TR1
INPUT 1 TR2
TR4
R2
NF 2
3
4
-VEOUT 5
R6
TR7
+VEOUT 6
TR6
R4
TR5
V SS 7
R3
D4 D3
GND 8
D1 D2 R8
R5 R7
V 9
CC
R9
TR8
All manuals and user guides at all-guides.com
IC1 BU1924 (MAIN BAORD)
16 15 14 13 12 11 10
CLOCK
DEFFERENTIAL BIPHASE PLL PLL 57KHz
DECODER DECODER 1187.5Hz
8TH SWITCHED
CAPACITOR
FILTER
1 2 3 4 5 6 7
IC950 NJM2103 (POWER BOARD)
CR 1
– +
VSC 2 VREF
+ –
OUTC 3
GND 4
Q
R S
+ +
– –

3-3. IC PIN FUNCTION DESCRIPTION

IC103 µPD780205GF (DISPLAY BOARD)
Pin No. Pin Name
1 VDD +5V
2 S1
9
3 S2
TEST
4 IC.MUTE
5 P34
6 P33
7 S.DATA (M61501FP)
RDS/ARI
8 S.CLK (M61501FP)
9 S.CE (M61501FP)
10 RESET
11 X2
12 X1
8
13 VSS
14 —
15 RDS.DATA.IN
16 VDD +5V
17 S.CE (LV1050M)
18 S.CLK(DOLBY.TUNER)
19 S.DATA(DOLBY.TUNER)
8 RESET
20 S.CE (TUNER)
21 AUTO-STOP
7 VSA 22 T.MUTE
23 STEREO-IN
24 PLL.DATA
6
VSB/SESIN 25 AVSS
26 SIRCS
27 P16
5 V+
28 SIGNAL
29 VERSION
30 A/D IV
31 A/D III
32 A/D II
33 A/D I
34 AVDD +5.0V
35 AVREF
36 P03
37 P02
38 RDS.CLK.IN
39 STOP
40 VSS
41 P74
42 P73
43 P72
44 P71
45 MUTING LED
46 VDD +5.0V
47 PROTECT
48 POWER-RY
49 ENCODER
50 ENCODER
8 8
I/O Description
Power supply to µ-com
I
O Control Video IC switching
O Control Video IC switching
O Control mute of Video IC
—
—
O Volume IC data
O Volume IC clock
O Volume IC enable
Read µ-com reset signal
I
—
For µ-com clock
—
— Programming pow. supply
— No use
I Read decoded RDS data
Power supply to µ-com
—
O Chip enable for ICs
O Output clock signal
O Output data signal
O Chip enable for ICs
I Tuner has tuned to a freq.
O Mute tuner during scanning
I Tuned freq. has stereo
I Input tuner freq. data
— Analog ground
I Read remote comm. signal
—
I Detect RDS signal level
I Read version setting
I Read key push signal
I Read key push signal
I Read key push signal
I Read key push signal
— Analog Power Supply
— Analog reference ground
—
—
I Read decoded RDS clock
I Read signal when AC off
µ-com ground
—
—
—
—
—
O Control mute LED
Power supply to µ-com
—
I Detect Protector Status
O Control Power relay
I Read volume encoder changing
I Read volume encoder changing