Sony ST-SB920 Service Manual ▷ View online
ST-SB920
—17 —
— 18 —
4-6. SCHEMATIC DIAGRAM – TUNER SECTION (2/2) –
• See page 8 for Waveforms. • See page 20 for IC Block Diagrams.
BUFFER
— 19 —
4-7. IC PIN FUNCTION (DISPLAY BOARD)
• IC701 System Control (
• IC701 System Control (
µ
PD780205GF-040-3BA)
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41 to 46
47 to 78
79
80 to 84
85 to 100
Pin Name
VDD
ANT
ATT
BAND1
BAND2
IF-B
NC
MONO
TUN
RESET
X2
X1
GND
NC
LOCK
VDD
CLK
DATA
D-IN
CE
BLN
ST
CAL
AST
AVSS
MUTE
EON
PGM
DATA RDS
R2
KEY 2
KEY 1
SI
AVDD
AVREF
RIN
R1
RDS CLK
POWER
GND
IS 1 to 5
P1 to P32
V LOAD
P33 to P37
G1 to G16
I/O
—
—
—
—
—
—
—
—
—
I
O
I
—
—
I
—
O
O
I
O
—
I
—
I
—
O
O
—
I
O
I
I
I
—
I
I
I
I
I
—
I
O
—
O
O
Function
Power supply (+5V).
Not used. (Open)
Not used. (Open)
Not used. (Open)
Not used. (Open)
Not used. (Open)
Not used. (Open)
Not used. (Open)
Not used. (Open)
System reset input.
Oscillation signal output (4.19MHz).
Oscillation signal input (4.19MHz).
Ground.
Not used. (Open)
Lock signal input.
Power supply (+5V).
PLL clock to FE101.
PLL data to FE101.
PLL data from FE101.
PLL Latch to FE101.
Not used. (Open)
Stereo display detection.
Not used. (Open)
Auto stop signal detection.
Ground.(Analog)
Muting signal output.
External control.
Not used. (Open)
RDS data input.
Rotary encoder phase detection.
Key input.
Key input.
Signal input.
Analog power supply (+5V).
Reference voltage (+5V).
Remote control input.
Rotary encoder number of rotation detection.
RDS data clock input.
Power supply ON/OFF monitor.
Ground.
Model detection.
Fluorescent indicator tube, segment drive.
Power supply (-30V).
Drives indication tube.
Fluorescent indicator tube, grid drive.
— 20 —
3
6
11
2
5
8
1
4
14
15
12
9
10
16
13
7
FM IF AMP
LIMITER
AF/NULL
METER
QUADRATURE
DET
AF AMP
IF OFF
NULL METER
SHORTING
LEVEL
DET
METER
DRIVE
MUTING
CIRCUIT
CIRCUIT
DETUNE
DET
GND
B+
3
6
9
2
5
8
1
4
7
10
18
15
12
19
16
13
20
17
14
11
AM RF AMP
AM IF AMP
AM
MIXING
AGC
AM
OSC
GND
B+
(RF)
AM DET
METER
DRIVE
B+
(IF)
1
FM/AM SELECT
MUTING
FM/AM SELECT CONTROL
LOGIC / MUTE ON/OFF
MUTING
OUT
LAMP
DRIVE
PLL
GND
MPX
22
21 20 19 18 17 16
15
14
13
12
2
3
4
5
6
7
8
9
10
11
AM
+B
VCO
MUTE
ST
FM
L
R
FM/AM
1
2
3
4
REG
GND
CONTROL
REG
5
6
7
4-8. IC BLOCK DIAGRAMS (TUNER BOARD)
IC301 LA3401
IC901 LA5667
IC401 LA1245
IC221, IC251 LA1235
QUALITY BIT
GENERATOR
DEFFERENTIAL
DECODER
BIPHASE
SYMBOL
SYMBOL
DECODER
OSCILLATOR
AND
DIVIDER
57kHz
BANDPASS
(8th ORDER)
CONTAS LOOP
VARIABLE AND
FIXED DIVIDER
FIXED DIVIDER
REFERENCE
VOLTAGE
ANTI-
ALIASING
FILTER
CLOCKED
COMPARATOR
TEST LOGIC AND OUTPUT
SELECTOR SWITCH
RECONSTRUCTION
FILTER
14
15
16
13
12
11
10
9
3
2
1
4
5
6
7
8
CLOCK REGENERATION
AND SYNC
VP1
RDCL
TS7
OSCO
OSCI
V
DDD
V
SSD
TEST
TSTL
D
QUAL
RDDA
Vref
MUX
V
DDA
V
SSA
CIN
SCOUT
IC801 BU1992
SECTION 5
EXPLODED VIEWS
NOTE:
•
-XX, -X mean standardized parts, so they may
have some differences from the original one.
have some differences from the original one.
•
Items marked “*” are not stocked since they
are seldom required for routine service. Some
delay should be anticipated when ordering these
items.
are seldom required for routine service. Some
delay should be anticipated when ordering these
items.
•
Color Indication of Appearance Parts
Example:
KNOB, BALANCE (WHITE) . . . (RED)
Example:
KNOB, BALANCE (WHITE) . . . (RED)
↑
↑
Parts of Color Cabinet’s Color
•
The mechanical parts with no reference number
in the exploded views are not supplied.
in the exploded views are not supplied.
•
Hardware (# mark) list and accessories and
packing materials are given in the last of this
parts list.
packing materials are given in the last of this
parts list.
The components identified by mark
!
or
dotted line with mark
!
are critical for safety.
Replace only with part number specified.
— 21 —
When indicating parts by reference number,
please include the board name.
please include the board name.
5-1. FRONT PANEL AND CASE SECTION
Ref. No.
Part No.
Description
Remarks
1
X-4949-523-1 FOOT ASSY (F50180S)
2
4-970-124-01 CUSHION (F50180S)
* 3
3-703-353-06 SUPPORT, PC BOARD
* 4
A-4407-370-A TUNER BOARD, COMPLETE
5
3-710-901-01 SCREW, TAPPING (SILVER)
5
3-710-901-11 SCREW, TAPPING (BLACK)
* 6
4-998-495-01 CASE (407026) (BLACK)
6
4-998-495-21 CASE (407026) (SILVER)
7
3-703-244-00 BUSHING, CORD
!
8
1-575-651-21 CORD, POWER
!
9
1-770-019-11 ADAPTOR, CONVERSION PLUG 3P (UK)
* 10
4-998-494-01 PANEL, BACK (AEP)
* 10
4-998-494-11 PANEL, BACK (UK)
11
3-704-515-01 SCREW (BV/RING)
* 12
1-669-149-11 TRANS BOARD
!
PT901
1-423-525-11 TRANSFORMER, POWER
Ref. No.
Part No.
Description
Remarks
b
b
a
a
1
not supplied
not supplied
not
supplied
supplied
not
supplied
supplied
not supplied
PT901
2
4
5
5
5
5
3
8
7
12
9
10
11
6
#1
#1
#1
#1
#1
#1
#2
#1
#1
#1
#1
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