Sony STR-SE581 User manual

STR-SE581
US Model SERVICE MANUAL
FM STEREO/FM-AM RECEIVER
MICROFILM
ManufacturedunderlicensefromDolbyLaboratories
Licensing Corporation.
“Dolby” “Pro Logic” and the double-D symbol aare
trademarks of Dolby Laboratories Licensing
Corporation. SPECIFICATIONS
— Continued on next page —
Audio power specifications
POWER OUTPUTAND TOTAL HARMONIC DISTORTION
With 8 Ωload, both channels driven, from 40 - 20,000 Hz, rated 100 watts per
channel minimum RMS power, with no more than 0.5% total harmonic distortion
from 250 milliwatts to rated output.
Amplifier section
Stereo mode (8 Ωat 40 Hz - 20 kHz less than 0.5% total
harmonic distortion)
100 W + 100 W
Surround mode (8 Ωat 1 kHz, THD 0.5%)
Front: 100 W/ch
Center: (Pro Logic Mode)
100 W
Rear: 50 W/ch
5.1/DVD INPUT* mode (8 Ωat 1 kHz, THD 0.8%)
Front: 100 W/ch
Center: 100 W
Rear: 50 W/ch
Frequency response PHONO: RIAA
equalization curve ±0.5 dB
TV/DBS, CD, TAPE/MD, VIDEO, 5.1/DVD
INPUT
10 Hz - 50 kHz ±1 dB
Inputs
Sensitivity Impedance S/N (weighting network,
input level)
PHONO
(MM) 2.5 mV 50 Kilohms 72 dB*
(A, 2.5 mV)
CD 400 mV
TAPE/MD, 250 mV 82 dB*
TV/DBS, 50 Kilohms (A, 150 mV)
VIDEO, 5.1/
DVD INPUT*
*78 IHF
Outputs TAPE/MD REC OUT:
Voltage: 150 mV,
Impedance: 10 kΩ
VIDEO AUDIO OUT:
Voltage: 150 mV,
Impedance: 10 kΩ
WOOFER:
Voltage: 2V,
Impedance: ±10 kΩ
PHONES:
Accepts low and high impedance headphones
Muting Full mute
BASS BOOST +10 dB at 70 Hz
TONE ±8 dB at 100 Hz and 10 kHz
FM tuner section
Tuning range 87.5 - 108.0 MHz
Antenna terminals 75 ohms, unbalanced
300 ohms, balanced
Sensitivity Mono: 18.3 dBf, 4.5 µV
Stereo: 38.3 dBf, 45 µV
Usable sensitivity 11.2 dBf, 2 µV (IHF)
S/N Mono: 76 dB
Stereo: 70 dB
Harmonic distortion at 1 kHz Mono: 0.3%
Stereo: 0.59%
Separation 45 dB at 1 kHz +0.5
Frequency response 30 Hz – 15 kHz–2 dB
Selectivity 60 dB at 400 kHz
AM tuner section
Tuning range 531 – 1710 kHz
Antenna Loop antenna
Usable sensitivity 50 dB/m (at 1,000 kHz)
S/N 54 dB (at 50 mV/m)

— 2 —
1. GENERAL································································3
2. TEST MODE····························································5
3. DIAGRAMS
3-1. Circuit Boards Location ·····················································6
3-2. Printed Wiring Board – Display Section – ························ 7
3-3. Schematic Diagram – Display Section – ··························· 9
3-4. Printed Wiring Board – Volume/Video Section –············ 11
3-5. Schematic Diagram –Volume/Video Section – ·············· 13
3-6. Printed Wiring Board – Main Section – ·························· 15
3-7. Schematic Diagram – Main Section (1/3) – ···················· 17
3-8. Printed Wiring Board – SP-SW, Power Section – ··········· 19
3-9. Schematic Diagram – Main Section (2/3), SP-SW – ······ 21
3-10. Schematic Diagram – Main Section (3/3), Power – ········ 23
3-11. IC Pin Function ································································ 25
3-12. IC Block Diagrams ···························································27
4. EXPLODED VIEWS
4-1. Front Panel Section ·························································· 29
4-2. Chassis Section ································································· 30
5. ELECTRICAL PARTS LIST································31
TABLE OF CONTENTS
Harmonic distortion 0.5% (50 mV/m, 400 kHz)
Selectivity At 10 kHz: 40 dB
General
System Tuner section:
PLL quartz-locked digital synthesizer system
Preamplifier section:
Low-noise NF type equalizer
Power amplifier section:
Pure-complementary SEPP
Power requirements 120 V AC, 60 Hz
Power consumption 230 W
AC outlets 2 switched, total 120 W/1A Max
Dimensions 17 ×5 7/8×11 5/8inches
(430 ×145 ×295 mm)
Mass (Approx.) 16 IB 15 oz (7.7 kg)
Supplied accessories FM wire antenna (1)
AM loop antenna (1)
Remote controller (remote) (1)
Size AA (R6) batteries (2)
Design and specifications are subject to change without notice.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK!OR DOTTED LINEWITH
MARK !ONTHE SCHEMATIC DIAGRAMS AND INTHE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.
After correcting the original service problem, perform the
following safety checks before releasing the set to the customer:
Checkthe antenna terminals,metaltrim, “metallized” knobs,screws,
and all other exposed metal parts forAC leakage. Check leakage as
described below.
LEAKAGE
The AC leakage from any exposed metal part to earth ground
and from all exposed metal parts to any exposed metal part having
a return to chassis, must not exceed 0.5 mA (500 microampers).
Leakage current can be measured by any one of three methods.
1. A commercial leakage tester,such as the Simpson 229 or RCA
WT-540A. Follow the manufacturers’ instructions to use these
instruments.
2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operatedAC voltmeter. The “limit” indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples of
a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2V AC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
To Exposed Metal
Parts on Set
0.15
µ F1.5 k
Ω
AC
Voltmeter
(0.75V)
Earth Ground
Fig.A. Using an AC voltmeter to check AC leakage.

— 3 —
SECTION 1
GENERAL
LOCATION AND FUNCTION OF CONTROLS
[FRONT PANEL]
1POWER switch (I/u)
2CENTER LEVEL +, – buttons
3PRO LOGIC indicator
4C. STUDIO indicator
5HALL indicator
6MASTER VOLUME control
7BALANCE control
8TREBLE control
9BASS control
0BASS BOOST button/indicator
!¡ SURROUND ON/OFF button
!™ MODE button
!£ SET UP button
!¢ EFECT/DELAY TIME button
!∞ 5.1/DVD INPUT button
!§ TAPE/MD FUNCTION button
!¶ TV/DBS FUNCTION button
!• VIDEO FUNCTION button
!ª PHONO FUNCTION button
@º TUNER FUNCTION button
@¡ CD FUNCTION button
@™ DIRECT button
@£ SHIFT button
@¢ Numeric buttons
@∞ PRESET TUNING +, – buttons
@§ MEMORY button
@¶ AM button
@• FM button
@ª FM MODE button
#º TUNING +, – buttons
#¡ PHONES jack
#™ SPEAKERS A/B buttons
#£ REAR LEVEL +, – buttons
12#
£
34 5 !
•
!
¶
!
§
!
¢
!
£
6
@§@•#º
#™
#¡
78!¡!∞ !™@º !ª@¡@™@£@¢@∞@¶@ª 9!º

— 4 —
[REAR PANEL]
1SIGNAL GND
25.1/DVD INPUT (FRONT/REAR)
3WOOFER
4ANTENNA (AM/FM)
5PHONO
6CD
7TAPE/MD
8TV/DBS
9VIDEO
0SURROUND SPEAKERS (REAR)
!¡ FRONT SPEAKERS
!™ AC OUTLET
!£ AC power code
!¢ 5.1/DVD INPUT (CENTER)
!∞ 5.1/DVD INPUT (WOOFER)
!§ SURROUND SPEAKERS (CENTER)
1 2 !¢ !∞ 3!™
45
6
7 8 9 0 !§ !¡ !£

— 5 — — 6 —
SECTION 2
TEST MODE
INITIALIZATION MODE
* All preset contents are cleared when this mode is activated. Use
this mode before returning the product to clients upon
completion of repair.
* Procedure:
While depressing the VIDEO, TAPE/MD and the CD buttons
simultaneously, press thepower [I/u] button toturnonthemain
power. The message INITIAL appears and initialization is
performed.
FLUORESCENT INDICATORTUBE TEST MODE
* All fluorescent segments are tested. When this test is activated,
all segments turn on at the same time, then each segment turns
on one after another.
* Procedure:
While depressing the CD and the TAPE/MD buttons
simultaneously, press thepower[I/u]button to turn onthe main
power. All segmentsturn onat thesame time,then each segment
turns on one after another. The message FINISH appears when
this test is complete.
AM CHANNEL STEP 9 kHz/10 kHz
SELECTION MODE
* Either the 9 kHz step or 10 kHz step can be selected for theAM
channel step.
* Procedure:
Set the FUNCTION to AM. Turn off the main power.
While depressing the TUNING+ button, press the power [I/u]
button to turn on the main power. Either the message 9k STEP
or 10k STEP appears. Select the desired step.
REAR SPEAKER GAIN UP MODE
* The rear speaker gain can be set to either NORMAL or GAIN
UP.
* Procedure:
While depressing the -SURROUND button, press the power [I/
u] button to turn on the main power. Either the message
NORMAL or GAIN UP appears. When the product enters this
mode again, the other gain appears. Select the desired gain.
SECTION 3
DIAGRAMS
3-1. CIRCUIT BOARDS LOCATION
• Waveforms
For schematic diagrams.
Note:
• All capacitors are in µF unless otherwise noted. pF: µµF
50 WV or less are not indicated except for electrolytics
and tantalums.
• All resistors are in Ωand 1/4W or less unless otherwise
specified.
• % : indicates tolerance.
•¢: internal component.
•2: nonflammable resistor.
•1: fusible resistor.
•C: panel designation.
•U: B+ Line.
•V: B– Line.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
No mark : FM
• Voltages aretaken withaVOM (Input impedance10 MΩ).
Voltage variations may benoteddue tonormal production
tolerances.
• Waveforms are taken with a oscilloscope.
• Circled numbers refer to waveforms.
• Signal path.
F: FM
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this necessary note is printed in each
block.)
For printed wiring boards.
Note:
•X: parts extracted from the component side.
•b: Pattern from the side which enables seeing.
SP-SW BOARD
PRIMARY BOARD
SECONDARY BOARD
STANDBY BOARD
MAIN BOARD
VIDEO BOARD
SWITCH BOARD
VOLUME BOARD
VR-TONE BOARD
KEY BOARD
DISPLAY BOARD
Note: The components identified by mark !or dotted line
with mark !are critical for safety.
Replace only with part number specified.
1IC300 @¢ (OSC)
2IC201 #¢ (X1)
8MHz
4.19MHz
4.75Vp-p
5.3Vp-p

STR-SE581
— 7 — — 8 —
3-2. PRINTED WIRING BOARD — DISPLAY SECTION —
Ref. No. Location
D201 C-3
D202 C-3
D203 C-3
D204 B-13
D211 C-9
D213 C-9
D214 C-9
D231 C-1
D234 C-2
D235 C-9
D236 C-10
D237 C-11
• Semiconductor Location
Ref. No. Location
D239 C-3
D240 C-2
IC201 D-6
IC202 B-2
IC203 D-11
Q201 B-13
Q202 B-12
Q231 C-1
Q232 E-3
12
A
B
C
D
E
F
G
H
34567891011121314
15
DISPLAY BOARD
KEY BOARD
F
TO
VOLUME BOARD
CNP202
J
TO
MAIN BOARD
CNS204
1-665-280- 11
(12)
1
10
E
1
9
(5.1 INPUT) 1 80
24
25
65
64
40 41
IC201
1-665-281-
11
(12)
(HALL) (C.STUDIO) (PRO LOGIC)
(REMOTO SEUSOR)
41
PRESET
TUNING
MEMORY
DIRECT
VIDEO
TV/DBS
CDTUNERPHONO
TAPE/MD
EFFECT
DELAY TIME
SET UP
5.1/DVD
INPUT
MODE
SHIFT
FM MODE
TUNING
REAR
LEVEL
CENTER
LEVEL
POWER
AM FM
EE
2134
67890
5
SURROUND
ON/OFF
41
E
16
23
22
12
(Page 16)
(Page 11)

STR-SE581
— 9 — — 10 —
3-3. SCHEMATIC DIAGRAM — DISPLAY SECTION — • See page 6 forWaveforms. • See page 25 for IC Pin Functions.

STR-SE581
H
TO
MAIN BOARD
CNP503
TO
MAIN BOARD
CNP504
E
TO
MAIN BOARD
CNS701
I
TO
MAIN BOARD
CNS251
G
1-665-284- 11
(12)
1-665-
283-
1-665-261-
1-665-
255- 11
(12)
11
(12)
11
(12)
M
MASTER VOLUME
SWITCH
BOARD
VIDEO
BOARD
VR-TONE
BOARD
VOLUME BOARD
1
10
E
E
E
E
E
10
1
E
FRONT REAR WOOFER CENTER
J501
WOOFER
J253
RLRLRL
F
TO
DISPLAY BOARD
CNS202
10
1
BASS
BASS
BOOST
TREBLEBALANCE
E
E
E
E
58
41
16
15
30
1
1
5
4
8
17 17
16
CN505CN501
(Page 15) (Page 15)
(Page 15)
(Page 7)
(Page 15)
JW261
E
— 11 — — 12 —
3-4. PRINTED WIRING BOARD —VOLUME/VIDEO SECTION —
12
A
B
C
D
E
F
G
H
I
345678910111213
Ref. No. Location
D238 F-5
D310 H-12
IC404 C-9
IC500 C-11
IC502 C-12
Q361 D-6
Q362 C-6
Q363 C-6
Q364 C-6
Q365 C-6
Q367 H-11
Q401 D-8
Q402 D-9
Q451 D-8
Q452 D-9
Q501 B-11
• Semiconductor
Location

STR-SE581
— 13 — — 14 —
3-5. SCHEMATIC DIAGRAM —VOLUME/VIDEO SECTION — • See page 7 for KEY Board PrintedWiring Board.

STR-SE581
1-665-279- 13
MAIN
BOARD
1
5
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
E
1
9
E
1
14
14
21
22
42
5
588
1
7
1
7
1
1
3
13
15
E
E
115
16
30
1
1
4
4
5
10
11
23
5
8
1
5
1
5
14
5
8
1
1
4
8
10
1
RY801
E
G
TO
SWITCH
BOARD
CNS503
H
TO
SWITCH
BOARD
CNS504
I
TO
VIDEO
BOARD
CNS250
B
TO
SP-SW
BOARD
CNS705
C
TO
STANDBY
BOARD
CNP802
D
TO
SECONDARY BOARD
CNP801
TO
SP-SW
BOARD
CNP703
CNP704
A
112
1324
E
J
TO
DISPLAY BOARD
CNS201
E
TO
VOLUME BOARD
CNS402
AUDIO OUT AUDIO IN
IN
REC OUT
CD
PHONO
FRONT SPEAKERS
SURROUND SPEAKERS
REAR
ANTENNA
CENTER
RL
RL
RL RL RL RL RL RL
VIDEO
TAPE /MD
A
B
TM701
TM601
TV/DBS
TM1
E
IC300
16
1
2
22
23
(Page 19)
(Page 19)
(Page 19)
(Page 19)
(Page 7)(Page 11)
(Page 12)
(Page 12)
(Page 12)
— 15 — — 16 —
3-6. PRINTED WIRING BOARD — MAIN SECTION —
12
A
B
C
D
E
F
G
H
I
J
K
3456789101112131415
Ref. No. Location
D311 J-5
D312 J-5
D560 C-7
D610 C-7
D710 J-13
D721 H-6
D722 H-6
D723 I-6
D724 H-6
D725 I-6
D726 I-6
D727 J-6
D728 J-5
D801 I-7
D802 F-13
D803 D-13
D804 K-8
D810 C-14
D811 C-14
D812 C-14
D813 C-14
D814 C-13
D815 C-13
D817 F-6
D818 D-15
D901 D-3
IC300 H-5
IC301 G-4
IC302 H-3
IC401 C-5
IC402 C-3
IC501 H-3
IC551 H-8
IC601 C-10
IC651 D-10
IC701 E-8
IC801 E-6
IC802 E-6
IC950 B-11
Q551 I-9
Q552 I-10
Q553 J-10
Q554 I-10
Q560 C-7
Q570 I-9
Q610 D-7
Q701 H-8
Q702 G-10
Q703 H-10
Q704 G-10
Q710 K-12
Q720 G-9
Q721 H-6
Q722 I-7
Q723 I-6
Q751 F-9
Q752 E-10
Q753 F-10
Q754 E-10
Q770 E-9
Q801 I-8
Q802 C-15
Q808 F-6
Q809 E-14
Q951 B-12
• Semiconductor
Location

STR-SE581
— 17 — — 18 —
3-7. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) — • See page 6 forWaveforms. • See page 27 for IC Block Diagrams.
OSC

STR-SE581
— 19 — — 20 —
3-8. PRINTED WIRING BOARD — SP-SW, POWER SECTION —
12
A
B
C
D
E
F
G
H
I
345678910111213
1
2
1
4
T902
CN902
CNP903
PRIMARY BOARD
SECONDARY BOARD
SP-SW BOARD
STANDBY BOARD
C
TO
MAIN
BOARD
CNS802
B
A
TO
MAIN BOARD
CNP702
TO
MAIN BOARD
CN706
D
TO
MAIN BOARD
CN801
OFF ON
TO
MAIN BOARD
CN706
A
1-665-289- 11
(12)
1-665-285- 11
(12)
1-665-
286- 11
(12)
1-665-287- 11
(12)
J741
PHONES
S701
SPEAKERS
T901
POWER
TRANSFORMER
1
3
1
5
15
1
10
AC
IN
AC OUTLET
16
(Page 16)
(Page 16)
(Page 16)
(Page 16)
(Page 16)
CNJ902

STR-SE581
— 21 — — 22 —
3-9. SCHEMATIC DIAGRAM — MAIN SECTION (2/3), SP-SW — • See page 15 for MAIN Board PrintedWiring Board. • See page 27 for IC Block Diagrams.

STR-SE581
— 23 — — 24 —
3-10. SCHEMATIC DIAGRAM — MAIN SECTION (3/3), POWER —
• See page 15 for MAIN Board PrintedWiring Board. • See page 19 for SECONDARY/PRIMARY/STANDBY Board Printed Wiring Boards. • See page 27 for IC Block Diagrams.
CN902
CNP903
JW1

— 25 —
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
I/O
O
O
O
O
O
O
O
—
I
I
I
O
O
I
O
I
I
I
I
—
O
O
O
—
I
I
I
I
—
—
—
—
—
—
—
O
—
—
—
O
Description
Fluorescent indicator tube drive.
Power supply (+5V).
System clock.
System data.
PLL data input from TU001.
Chip enable output.
Chip enablr output.
Input for model slect.
Standby relay ON/OFF control.
Protector detect input.
System reset terminal.
Auto stop detect input.
Stereo detect input.
Ground.
Speaker relay drive.
Surround Relay.
Power relay drive.
Not used.
A/D signal input terminal.
A/D3 key input terminal.
A/D2 key input terminal.
A/D1 key input terminal.
Power supply (+5V).
Reference voltage (+5V).
Ground.
Not used (Open).
Ground.
System clock (4.19MHz).
System clock (4.19MHz).
Mute drive output for µPD2581V (IC701).
Plologic LED drive.
CINEMA STUDIO LED drive.
Hall LED drive.
Tuner mute drive output.
Pin Name
DIG7
DIG6
DIG5
DIG4
DIG3
DIG2
DIG1
+5V
S. CLK
S. DATA
PLL. DATA
S. CE (LC7288)
S. CE (LV100)
REARRY
BRIDGE CABLE
PROTECT
RESET
AUTO-STOP
STEREO-IN
AVss
SP-RY
SURR-RY
POWER-RY
Not used
SIGNAL
A/D3
A/D2
A/D1
AVDD
AV. REF
GND
NC
Vss
X1
X2
IC. MUTE
PROLOGIC
CSTUDIO
HALL
T. MUTE
3-11. IC PIN FUNCTION
DISPLAY BOARD IC201 : µPD78044FGF-064-3B9 (DISPLAY CONTROL)

— 26 —
Pin No.
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
I/O
O
O
—
I
I
I
I
—
I
I
O
—
—
O
O
I
I
I
I
I
O
O
O
O
O
O
O
O
O
O
—
O
O
O
O
O
O
O
O
O
Description
Volume up.
Volume down.
Standby LED drive.
System power ON/OFF.
RDS data input terminal (EXCEPTAustralian, E, Saudi Arabia, PX model).
RDS clock input terminal (EXCEPTAustralian, E, Saudi Arabia, PX model).
Stop signal input from NJM2103D (IC950).
Ground.
Sircs signal input.
Power switch input terminal.
5.1ch input LED.
Power supply (+5V).
Bass boost LED drive.
Line mute drive.
Surround Lch mute.
Input for model select.
Key in 4.
Key in 3.
Key in 2.
Key in 1.
Surround Rch mute.
Key out 1.
Key out 2.
Key out 3.
Key out 4.
Connect to –24V.
Fluorescent indicator tube drive.
Pin Name
VOLUME UP
VOLUME DOWN
STANDBY
SYS. POWER
RDS. DATA. IN
RDS. CLK. IN
STOP
Vss
SIRCS
POWER SW
5.1ch LED
+5V
BASS BOOST
FUNC. MUTE
SL MUTE
VERSION
K14
K13
K12
K11
SR MUTE
S15
S14
S13
S12
S11
S10
S9
S8
S7
VLOAD
S6
S5
S4
S3
S2
S1
DIG10
DIG9
DIG8

















Fluorescent indicator tube drive.

— 27 —
3-12. IC BLOCK DIAGRAMS
IC300 LV1016
IC301 LA2786
15 6
+
–
+
20 19 18 17 16 15 14 13
21
22
2324
2 3 4789 10 12
11
+
DEC
IN-FILTER
(40kHz)
VDD
ADM-CONT SRAM
ADM
OUT-FILTER
(7k/5k)
B-NR
DC-OUT
VOL/MUTE
S-TRIM
INV-PHASE
R+DELAY
L+DELAY
A
B
A
B
A
B
A
B
A
B
A
B
A
B
L–R
L+R
(–6dB)
A
B
A.GND L-OUT
R-OUT
VREF S-OUT
DELAY-OUT
S-IN
R-IN
L-IN
VCC
NR-DET
ENABLE
DATA
CLK
D.GND
DC-CUT VDD OSC OSC
NR-IREF
DC-CUT
1
2
3
4
5
6
7
8
9
15
10
11
12
–+
13
14
16
21
18 19
25
17
24
22
23
20
34
32
33
29
30
35
28
31
27
26
36
40
39
38
37
41
42
NOISE
FILTER NOISE
CH
BALANCE
CONTROL
VR
CONTROL
LPF
V REF
VR
VR
NOISE
GENERATOR
VCAVCA VCA
VCA
VCA
VCA
VCA
VCA
LPF
LPF
RECT RECT RECT RECT
P. S.P. S.
CMODE
MUTE
DIVIDER OSC
CONTROL
CTRIM
LOG
DIFF LOG
DIFF
DUAL T
CONTROL
L-IN
R-IN
V
SS
CLK DATA V
CC
L-OUT R-OUT
S-OUT C-OUT
ENABLE
OSC1 CMODE-CAP. C-TRIM DC CUT R-BPF1 R-BPF2 R-BPF3 DC CUT DC CUT L-R RECT L+R RECT VCS-TH VCS-1 VCS-2
BPF1 BPF2
VREF
S-CH DC OUT C-CH DC OUT
L-CH DC OUT
R-CH DC OUT
VREF
L-BPF1 L-BPF2 L-BPF3
DC CUT DC CUT
R RECT
L RECT
VLR-TH
VLR-1 VLR-2

— 28 —
IC551 STK350-230
IC701 µPC2581V
IC950 NJM2103D
235
46798
1
MUTE
+ VOUT1 – VOUT1
COMP1
MF1
IN1
GND
IN2
NF2
COMP2
– VOUT2 + VOUT2
VCC1 VCC2
VEE
PROTECTOR
BIAS CIRCUIT
REG DRIVE PRE
DRIVE
11
10 12 13 1514
DRIVE
PRE
DRIVE
1
2
3
45
6
7
8
V+
VSB/SESIN
VSA
RESET
GND
OUTC
VSC
CR
VREF
+–
–+
–
+
–
+
Q
R S
IC401 LC7822
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
CONTROL
LATCH
SHIFT RESISTOR
LEVEL SHIFT
CL
DI
CE
VEE
OUT
IN
OUT
IN
OUT
IN
VSS
S
RESET
VDD
OUT
IN
IN
OUT
IN
OUT
IN
1
2
3
4
5
6
7
8
9
TR3 R1
R2
TR4
TR6
TR7
R4
R9
TR5
TR1
TR2
R6
D4 D3
R7
R8
TR8
D1 D2 R5
R3
INPUT
NF
-VEOUT
+VEOUT
VSS
GND
VCC
SUB

SECTION 4
EXPLODEDVIEWS
Note:
• -XX, -X mean standardized parts, so they may
have some differences from the original one.
• Items marked “*” are not stocked since they
are seldom required for routine service. Some
delayshouldbe anticipated when orderingthese
items.
• Themechanicalpartswith no reference number
in the exploded views are not supplied.
• Hardware (# mark) list and accessories and
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.
— 29 —
4-1. FRONT PANEL SECTION
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
1 4-980-639-01 KNOB (R14)
2 X-4946-873-1 KNOB (R48) ASSY
3 X-4949-644-1 FRONT PANEL ASSY
4 4-989-843-01 BUTTON (P-T)
*5 4-921-941-01 CUSHION (FL)
*6 4-943-107-11 HOLDER (FL TUBE)
*7 4-980-658-01 CASE (413226)
8 3-710-901-11 SCREW, TAPPING
*9 A-4407-439-A DISPLAY BOARD, COMPLETE
10 1-782-100-11 WIRE (FLAT TYPE) (23 CORE)
11 1-769-911-11 WIRE (FLAT TYPE) (9 CORE)
12 1-782-081-11 WIRE (FLAT TYPE) (15 CORE)
13 4-951-620-01 SCREW (2.6X8), +BVTP
*14 A-4407-441-A VR-TONE BOARD, COMPLETE
16 3-008-600-11 EMBLEM (5-AR), SONY
*17 A-4407-442-A KEY BOARD, COMPLETE
18 4-977-358-11 CUSHION
FL201 1-517-141-11 INDICATOR TUBE, FLUORESCENT
SONY
a
a
78
8
6
5
8
910
13
13
11
12 13
18
14
18
3
1
2
4
5
16
17
FL201
#1
#1
not supplie
d
#1
#1
VOLUME board
(Including in 14)

— 30 —
4-2. CHASSIS SECTION
54 55
56
63
65 53
70
64
58
71
59
69
60
61
57
62
51
52
not supplied
not supplied
not supplied
not supplied
T901
Transistor
not supplied
#1
#1
#1
#1
#1
#1
#1
#1
#2 #2
#1
#1
#1
#1
#1
#1
#1
#1
#1
#1
#1
#1
#1
#1
#1#1 #3
CNJ902
Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks
*51 1-665-289-11 SP-SW BOARD
52 4-951-801-01 BUTTON (S)
53 4-812-134-00 RIVET (DIA. 3.5), NYLON
*54 1-665-286-11 PRIMARY BOARD
*55 1-665-287-11 SECONDARY BOARD
*56 1-665-285-11 STANDBY BOARD
*57 A-4407-444-A MAIN BOARD, COMPLETE
*58 3-703-244-00 BUSHING (2104), CORD
*59 4-997-684-21 BACK PANEL
*60 A-4407-443-A VIDEO BOARD, COMPLETE
61 1-782-668-11 WIRE (FLAT TYPE) (11 CORE)
62 X-4947-208-1 FOOT ASSY (F50150S)
63 4-924-098-01 HOLDER, PC BOARD
*64 A-4392-780-A SWITCH BOARD, COMPLETE
*65 4-954-051-51 HOLDER, PC BOARD
69 1-782-243-11 WIRE (FLAT TYPE) 15P
70 3-905-609-01 SCREW (TRANSISTOR)
!71 1-777-070-21 CORD, POWER
!CNJ902 1-251-698-11 OUTLET (AC) (2P)
!T901 1-431-267-21 TRANSFORMER, POWER
The components identified by mark !or dotted
line with mark !are critical for safety.
Replace only with part number specified.