Sony STR-K402 - Fm Stereo/fm-am Receiver User manual

STR-K402
US Model SERVICE MANUAL
FM STEREO FM-AM RECEIVER
— Continued on next page —
SPECIFICATIONS
Ver 1.0 2001. 04
Manufactured under license from Dolby Laboratories Licensing
Corporation.
“DOLBY” the double-D symbol ;“AC-3” and “Pro Logic” are
trademarks of Dolby Laboratories Licensing Corporation.
Outputs MD/TAPE (OUT):
VIDEO (AUDIO OUT):
Voltages: 250 mV,
Impedance:
10 kilohms
SUB WOOFER:
Voltage: 2 V
Impedance :
1 kilohms
PHONES:
Accepts low– and
high-impedance
headphones
TONE ±6 dB at 100 Hz
and 10 kHz
Sampling frequency
48 kHz (OPTICAL IN)
96 kHz (COAXIAL IN)
FM tuner section
Tuning range 87.5 - 108.0 MHz
Antenna terminals
75 ohms, unbalanced
Intermediate
frequency
10.7 MHz
Sensitivity Mono: 18.3 dBf,
2.2 µV/75 ohms
Stereo: 38.3 dBf,
22.5 µV/75 ohms
Usable sensitivity
11.2 dBf, 1 µV/75 ohms
S/N Mono: 76 dB
Stereo: 70 dB
Harmonic distortion at 1 kHz
Mono: 0.3%
Stereo: 0.5%
Separation 45 dB at 1 kHz
Frequency response
30 Hz - 15 kHz
+0.5/-2 dB
Selectivity 60 dB at 400 kHz
AUDIO POWER
SPECIFICATIONS
POWER OUTPUT AND
TOTAL HARMONIC
DISTORTION:
With 8 ohm loads, both
channels driven, from 40 -
20,000 Hz; rated 80 watts
per channel minimum RMS
power, with no more than
0.09% total harmonic
distortion from 250
milliwatts to rated output
Amplifier section
POWER OUTPUT
Rated Power Output at Stereo mode
(8 ohms 40 Hz - 20 kHz, THD 0.09%)
80 W + 80 W
Reference Power Output
(8 ohms 1 kHz, THD 0.7%)
Front
1)
: 80 W/ch
Center
1)
: 80 W
Surround
1)
: 80 W/ch
1) Depending on the sound field settings and
the sources, there may be no sound output.
Frequency response
MULTI CH IN, CD,
MD/TAPE, DVD/LD,
TV/SAT, VIDEO:
20 Hz – 20 kHz
0/– 0.5 dB (sound field,
and tone bypassed)
Inputs (Analog)
MULTI CH IN, CD,
MD/TAPE, DVD/LD,
TV/SAT, VIDEO:
Sensitivity: 250 mV
Impedance:
50 kilohms
S/N
2)
: 85 dB
(A, 250 mV
3)
)
2) INPUT SHORT
3) Weighted network, input level
Inputs (Digital)
DVD/LD (coaxial):
Sensitivity: –
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)
TV/SAT (Optical):
Sensitivity: –
Impedance: –
S/N: 100 dB
(A, 20 kHz LPF)
Sony Corporation
Home Audio Company
Shinagawa Tec Service Manual Production Group
9-873-895-11
2001D1600-1
© 2001.4

2
STR-K402
MODEL IDENTIFICATION
— BACK PANEL —
AM tuner section
Tuning range
With 10-kHz tuning
scale:
530 - 1710 kHz4)
With 9-kHz tuning
scale:
531 - 1710 kHz4)
Antenna Loop antenna
Intermediate 450 kHz
frequency
Usable sensitivity
50 dB/m (at 1,000 kHz
or 999 kHz)
S/N 54 dB (at 50mV/m)
Harmonic distortion
0.5% (50mV/m, 400
kHz)
Selectivity: At 9 kHz: 35 dB
At 10 kHz: 40 dB
4) You can change the AM tuning scale to 9
kHz 10 kHz. After tuning in any AM
station, turn off the receiver. Hold down the
TUNING + button and press the
button. All preset stations will be erased
when you change the tuning scale. To reset
the scale to 10 kHz (or 9 kHz), repeat the
procedure.
Video section
Inputs Video: 1 Vp-p 75 ohms
Outputs Video: 1 Vp-p 75 ohms
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
185 W
In Standby
Condition:
1 W
Dimensions 430 ×145 ×298 mm
(17 7
7/819 5/8in.)
including projecting
parts and controls
Mass (Approx.)
7.2 kg (15 lb 14 oz)
Supplied accessories
Design and specifications are subject
to change without notice.
•FM wire antenna (1)
•AM loop antenna (1)
•R6 (size-AA) batteries (2)
•Remote Commander (remote) (1)
××
Parts No.
MODEL PARTS No.
US 4-235-014-0s

3
STR-K402
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINEWITH
MARK 0ON THE SCHEMATIC DIAGRAMS AND IN THE 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:
Checktheantenna terminals,metal trim,“metallized” knobs, screws,
and all other exposed metal parts forAC leakage. Check leakage as
described below.
LEAKAGE
TheAC 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 microamperes).
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 0.75V, 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 2VAC range are suitable. (See
Fig. A)
SAFETY CHECK-OUT
To Exposed Metal
Parts on Set
0.15 µF1.5 kΩ
AC
Voltmeter
(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
TABLE OF CONTENTS
1. GENERAL ·········································································· 4
2. TEST MODE ······································································ 6
3. DIAGRAMS
3-1. Circuit Boards Location ··············································· 8
3-2. Block Diagram Main Section····································· 9
3-3. Block Diagram Display Section······························· 10
3-4. Schematic Diagram Main Section (1/3)··················· 11
3-5. Schematic Diagram Main Section (2/3)··················· 12
3-6. Schematic Diagram Main Section (3/3)··················· 13
3-7. Printed Wiring Board Main Section························· 14
3-8. Schematic Diagram Digital Section ························ 15
3-9. Printed Wiring Board Digital Section ······················ 16
3-10. Schematic Diagram Display Section······················· 17
3-11. Printed Wiring Board Display Section ····················· 18
3-12. Schematic Diagram Video Section ·························· 19
3-13. Printed Wiring Board Power Section ······················· 19
3-14. Printed Wiring Board Video Section ························ 19
3-15. IC Block Diagrams····················································· 20
3-16. IC Pin Function Description ······································ 21
4. EXPLODED VIEWS ······················································ 23
4-1. Front Panel Section ···················································· 23
4-2. Chassis Section ·························································· 24
5. ELECTRICAL PARTS LIST ······································· 25

4
STR-K402 SECTION 1
GENERAL This section is extracted
from instruction manual.

5
STR-K402

6
STR-K402 SECTION 2
TEST MODE
SOFTWARE VERSION DISPLAY MODE
* The software version is displayed.
* Procedure:
While depressing the TUNER and the VIDEO buttons
simultaneously, press the power ?/1 button to turn on the main
power. The model name, destination and the software version are
displayed.
FLUORESCENT INDICATOR TUBE 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 TV/SAT and the DVD/LD buttons
simultaneously, press the power ?/1 button to turn on the main
power.
1. All segments turn on.
NAME , SURR and SOUND FIELD MODE LED turn on.
2. Press the VIDEO button, confirm display
Digital Cinema Sound, SET UP and 2CH LED turn on.
3. Press the VIDEO button, confirm display
MULTI CHANNEL DECODING(blue), LEVEL and A.F.D.
LED turn on.
4. Press the VIDEO button, All segments turn off.
5. Every pressing of the VIDEO button turns on each segment and
LED one after another in the same order.
(Not only the VIDEO button, but also the other buttons such as
DVD/LD , TV/SAT , MD/TAPE , CD , TUNER can be used.)
FACTORY SET MODE
* All preset contents are reset to the default setting.
* Procedure:
While depressing theVIDEO and the CD buttons simultaneously,
press the power ?/1 button to turn on the main power. The
message FACTORY appears and switch off the set.
While depressing theVIDEO and the CD buttons simultaneously,
press the power ?/1 button again. The message FACTORY
appears and the present contents are reset to the default values.
SOUND FIELD CLEAR MODE
* The preset sound field is cleared when this mode is activated.
Use this mode before returning the product to clients upon
completion of repair.
* Procedure:
While depressing the SOUND FIELD MODE button, press the
power ?/1 button to turn on the main power. The message
S. F. CLR appears and initialization is performed.
AM CHANNEL STEP 9 kHz/10 kHz
SELECTION MODE
* Either the 9 kHz step or 10 kHz step can be selected for the AM
channel step.
* Procedure:
Set the FUNCTION to AM. Turn off the main power.
While depressing the TUNING+ button or the
PRESET TUNING+ button, press the power ?/1 button to turn
on the main power. Either the message 9 k STEP or 10 k STEP
appears. Select the desired step.
KEY CHECK MODE
* Button check
* Procedure:
Whiledepressingthe SURRand theA.F.Dbuttons simultaneously,
press the power ?/1 button to turn on the main power.
“REST 36”appears.
Every pressing of any button other than ?/1 counts down the
buttons. The buttons which are already counted once are not
counted again. When all buttons are pressed “REST 00”appears.
When MASTER VOLUME is rotated in clockwise direction,
“VOL MIN”, “VOL 1”to “VOL 30”, “VOL MAX”appear.
SW
L
SL
CR
SSR
SLEEP
SP.OFF
( ( ( L F E ) ) )
DIGITAL
OPT COAX MULTI CH IN
PRO LOGIC DTS MPEGSTEREO MONO RDS MEMORY
MUTINGINFONEWSTAEQD.RANGE
D
D
dB
kHz
mft.
MHz
SW
LR
S
SLEEP
L F E
COAX
PRO LOGIC MPEGSTEREO RDS
MUTINGINFOTAD.RANGE
D
D
k
m
MHz
SL
C
SR
SP.OFF
( ( ( ) ) )
DIGITAL
OPT MULTI CH IN
DTS MONO MEMORY
NEWSEQ
dB
Hz
ft.

7
STR-K402
SECTION 3
DIAGRAMS
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.
•f: internal component.
•2: nonflammable resistor.
•1: fusible resistor.
•C: panel designation.
•A: B+ Line.
•B: B– Line.
•H: adjustment for repair.
• Voltages and waveforms are dc with respect to ground
under no-signal (detuned) conditions.
No mark : FM
• Voltages are taken with a VOM (Input impedance 10 MΩ).
Voltage variations may be noted due to normal production
tolerances.
• Waveforms are taken with a oscilloscope.
• Circled numbers refer to waveforms.
• Signal path.
F: FM
f: CD
THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this necessary note is printed in each
block.)
• Waveform
– DISPLAY BOARD –
– DIGITAL BOARD –
C
B
These are omitted.
E
Q
B
These are omitted.
CE
1 IC102 id
5.8Vp-p
63ns
2 IC1005 7
5.8Vp-p
81ns
For printed wiring boards.
Note:
•X: parts extracted from the component side.
•a: Through hole.
•f: internal component.
•b: Pattern from the side which enables seeing.
The components identified by mark 0or dotted
line with mark 0are critical for safety.
Replace only with part number specified.

8
STR-K402
3-1. CIRCUIT BOARDS LOCATION
STANDBY board
POWER SW board
HP board
DISPLAY board MAIN board
VIDEO board
DIGITAL boar
d

99
STR-K402
3-2. BLOCK DIAGRAM – MAIN SECTION –
— TUNER UNIT —
• Signal Path
• R-CH is omitted due to same as L-CH.
: FM
: CD
FM
AM
R-CH
S DATA
PLL DATA
S CLK
S LAT
STEREO
AUTO STOP
S DATA
DATA OUT
S CLK
S LAT
STEREO
TUNED
T MUTING T MUTING
FM
AM
R OUT
L OUT
CD IN
MD/TAPE OUT
DVD/LD
AUDIO IN
VIDEO
AUDIO OUT
VIDEO
AUDIO IN
FRONT
SURROUND
CENTER
SUB WOOFER
J501
PROC.
IC201
IN G2
63
IN B2
70
REC OUT 2A
61
IN C2
69
IN E2
67
REC OUT 2B
62
49
L OUT
IN D2
68
43
SL OUT
37
C OUT
28
SW CH OUT
MUTING
Q361
DATA
32
CLOCK
31
LATCH
33
DATA
CLOCK
S CE
MUTING
Q362
MUTING
Q363
MUTING
Q364
J1004
J1006
VIDEO
VIDEO IN
MONITOR
VIDEO OUT MOUT
10
V1
12
OUT
5
V2
3
V3
1
2S1
13S2
4M2
11
M1
VIDEO SELECT
IC1015
66
AUTO STOP
S1
75
S2
76
VIDEO MUTING
74
6567
STEREO
62
TUNER DATA IN
60
TUNER DATA OUT
61
TUNER CLK
59
TUNER LAT
79
M CLK
80
M CE
78
M DATA
AUTO STOP
T MUTING
T MUTING
STEREO
DATA
S DATA
S CLK
S LAT
CLOCK
S CE
DATA
SYSTEM CONTROL
IC102(1/2)
TV/SAT
AUDIO IN
J401
J402
MD/TAPE IN
J403
31
IC401(1/2)
DIGITAL
DVD/LD IN
J1001
IR LINK
DET
IC1002
DIGITAL
TV/SAT IN
3562
IC1003
DIGITAL AUDIO
I/F RECEIVER
IC1004
L
DIN0
3
DIN1
4
DO
35
DI
36
CLK
38
CE
37
ERROR
34
XSTATE
17
XMODE
48
12.288M
22
DIR DO
DIR DI
DIR CLK
DIR CE
DIR ERROR
DIR XSTATE
DIR MODE
13
MCLK
14
BCK
15
LRCK
16
DATAO
IC1003
17
IC1005
X1101
12.288MHz
62
IC1005
AUDIO DSP
IC1006
SDIA1
85
SDIA0
84
SO
67
SI
68
SCK
69
CS
66
CSB
65
IC
62
XI
8
DSP SO
47
SBOB0
46
SBOB1
45
SBOB2
SDBCK0
83
SDWCK0
82
DSP SI
DSP CLK
DSP CS
DSP CSB
DSP IC
35
IC1005
IC1007
SRAM
AUDIO CODEC
IC1008
MCLK
39
CDT1
43
CCLK
42
DIF0/CSN
41
DFS
11
PDN
17
SMUTE
3
CODEC CDT1
27
L OUT1
BCK
4
LRCK
5
SDTO
9
SDTI1
6
SDTI2
7
SDTI3
8
CODEC CLK
CODEC CS
CODEC DFS
CODEC MUTING
CODEC PD
57
IC402
3
L OUT2 31
IC403
23
L OUT3 31
IC404
24
R OUT3 57
IC404
LIN+
30
LIN-
29
21
IC1201
67
IC1201
ANALOG SOUND
IN F2
66
SW CH N IN
27
SL
50
44
38
SEL OUT2
60
TIN2
58
45
39
26
L CH N IN
SL CH N IN
C CH N IN
SL
C
SW
DOUT2
59
SL CH D IN
C CH D IN
SW CH D IN
A
89
VIDEO
VIDEO OUT
DVD/LD
VIDEO IN
TV/SAT
VIDEO IN
-5V
REG
3 2
-5V
IC1014
-12V
90 92 91 95 96 93 94
DIR DO
DIR D1
DIR CLK
DIR CE
DIR ERR
DIR XSTATE
DIR XMODE
DIR DATA0
24
DSP SO
DIR DO
DIR D1
DIR CLK
DIR CE
DIR ERR
DIR XSTATE
DIR XMODE
22
DSP SI
21
DSP CLK
25
DSP CS
99
DSP CSB
100
DSP IC
69
CODEC CDT1
DSP SO
DSP SI
DSP CLK
DSP CS
DSP CSB
DSP IC
68
CODEC CLK
73
CODEC CS
70
CODEC DFS
71
CODEC PD
72
CODEC MUTING
98
ANA/DIG
CODEC CDT1
CODEC CLK
CODEC CS
CODEC DFS
CODEC PD
CODEC MUTING
MUTING
CONT
Q103,104
88
SYSTEM MUTING
MUTING
SWITCH
Q379
49MD0
50
MD1
51
MD2
19
FLASH 1
20
FLASH 2
MD0
VDD
MD2
FLASH 1
FLASH 2
RESET
+5.6V
CNS105
FOR FRASH
PROGRAMMING
B
+5V
REG
3 1
+5V
IC1009
+9.2V
+5V
REG
3 1
+5V
IC1011
+5V
REG
3 1
+5V
IC1013
+3.3V
REG
3 1
+3.3V
IC1010
MULTI CH IN
ANTENNA

1010
STR-K402
3-3. BLOCK DIAGRAM –DISPLAY SECTION –
RESET
Q100,101
Q659
•Signal Path
•R-CH is omitted due to same as L-CH.
: FM
IN2
8
12
+V OUT2
POWER AMP
IC701
9
NF2
LIMITER
Q701
11
-V OUT2
LIMITER
Q702
BOOSTER
Q703
BOOSTER
Q704
CURRENT
DETECT
Q705,706
OVER LOAD
DETECT
Q708,709
IN1
6
2+V OUT1
5
NF1
LIMITER
Q651
3
-V OUT1
LIMITER
Q652
BOOSTER
Q653
BOOSTER
Q654
CURRENT
DETECT
Q655,656
IN+
1
6
+V OUT
POWER AMP
IC501
2
IN-
LIMITER
Q501
5-V OUT
LIMITER
Q502
BOOSTER
Q503
BOOSTER
Q504
CURRENT
DETECT
Q505,506
OVER LOAD
DETECT
Q507,509
OVER LOAD
DETECT
Q657,658
Q707 D706
D606
D506
D721
PROTECT
SWITCH
Q722,723,725
RELAY
DRIVE
Q791
RY791
RELAY
DRIVE
Q730
RY730
D731
RELAY
DRIVE
Q610
RY601
D735
RELAY
DRIVE
Q550
RY550
D734
IC401(2/2)
57
RELAY
DRIVE
Q560
RY560
D736
L
R
SR
SL
C
R-CH
R-CH
R-CH
SPEAKERS
FRONT
PHONES
SPEAKERS
SURROUND
SPEAKERS
CENTER
TM601
TM602
J253
58
PROTECT
15
H/P RY
10
SP A RY
14
REAR RY
12
CTR RY
13
WOOFER RY
LED DRIVE
Q008
RV102
VOL ENCODER
MASTER
VOLUME
1 3
VOL A
1
VOL B
2
PW KEY IN
56
S150
77
RESET
47
STOP
57
SIRCS REMOTE
CONTROL
RECEIVER 2
1
IC101
POWER
CONTROL
IC950 5
8
3
6
+5.6V REG
Q951
D110
D109
D910-913
AC
IN
T902
F901
RY901
D915D914
RELAY
DRIVE
Q901
D820-823
84
VCC
23
VCC
-7V
REG
3 2
+7V
REG
3 1
+5V
REG
3 1
+5V
REG
3 1
+5V
REG
3 1
AUDIO
+5V
LED
+5V
AUDIO
+7V
AUDIO
-7V
TUNER,RDS
VIDEO
+5V
IC807
IC803
IC804
IC801
IC802
POWER RY
8
RELAY
+B
+12V
REG
3 1
TUNER
+12V
IC806
-30V REG
Q801
FL201
-30V
-B SW
Q691
POWER AMP
-B
D898
D802
T901
POWER AMP
+B
82 83
X0
X1
X101
16MHz
FL1
FL2
L
SLSL
C
SW
A
VCC
13
VCC
14
+B
9
POWER
MUTING
Q747,748
29
AC MUTING
J791
FLUORESCENT
INDICATOR TUBE
FL101
16
FL DAT
17
FL CLK
18
FL LAT
7
DIN
8
CLK
9
STB
14 29
SEG1-16
42 31
GRID1-12
FL1 FL2
2LEVEL LED
3
NAME LED
1
SUR LED
4
SETUP LED
FL/LED DRIVE
IC103 D007-010
3
BLU LED
LED DRIVE
Q009
4
DCS LED
5
AFD LED
7
MODE LED
6
2CH LED
+5V
D011 D014
D002 D003 D004
FUNCTION
KEY
AD KEY IN1
38
S110,112,113
S115-118
S121,122
S100-103
S105-109
FUNCTION
KEY
AD KEY IN2
39
FUNCTION
KEY
AD KEY IN3
40
S111,114,120
S123-129
FUNCTION
KEY
AD KEY IN4
41
S104
S131-136
52
HSTX D101
BRESET
D824-827
VIDEO
+9.2V
VIDEO
-12V
SYSTEM CONTROL
IC102(2/2)
55
HP SW
SUB WOOFER
AUDIO OUT
?/1
SYSTEM
POWER

1111
STR-K402
3-4. SCHEMATIC DIAGRAM – MAIN SECTION (1/3) – • See page 20 for IC Block Diagram.
IC B/D
IC B/D
IC B/D
(Page 13)
(Page 12)

1212
STR-K402
3-5. SCHEMATIC DIAGRAM –MAIN SECTION (2/3) –•See page 20 for IC Block Diagram.
IC B/D
(Page 15)
(Page 15)
(Page 17)
(Page 17)
(Page 17)
(Page 11) (Page 13)

1313
STR-K402
3-6. SCHEMATIC DIAGRAM –MAIN SECTION (3/3) –
(Page 17)
(Page 12)
(Page 11)

1414
STR-K402
3-7. PRINTED WIRING BOARD –MAIN SECTION –
IC 804
PHONES
(Page 18)
(Page 18)
(Page 19)
(Page 19)
(Page 19)
(Page 16)
(Page 16)(Page 18)
TUNER
UNIT
IC 806
IC 803
IC 802
IC 801
IC 401
IC 702IC 701
IC 501
IC 201
IC 301
IC 402
IC 404
IC 403
IC 807
•See page 8 for Circuit Boards Location. There are a few cases that the part printed on
this diagram isn’t mounted in this model.
D505 F-4
D506 F-4
D508 F-3
D510 D-10
D560 C-8
D605 F-7
D606 F-8
D607 F-7
D610 C-9
D617 F-8
D627 F-11
D706 F-6
D710 C-10
D721 E-10
D722 E-10
D725 F-9
Ref. No. Location
•Semiconductor Location
Ref. No. Location Ref. No. Location
D726 F-9
D727 F-9
D728 F-5
D731 D-10
D732 D-10
D734 D-10
D735 D-9
D757 F-9
D791 F-12
D801 E-13
D802 C-13
D804 F-13
D820 E-12
D821 E-12
D822 E-12
D823 E-12
D824 E-12
D825 E-13
D826 E-13
D827 E-12
D833 D-7
D896 D-6
D898 F-11
D899 F-12
IC201 D-4
IC401 C-7
IC402 E-2
IC403 F-1
IC404 E-1
IC501 E-4
IC701 E-6
IC702 E-7
IC801 D-8
IC802 D-8
IC803 D-8
IC804 D-11
IC806 D-9
IC807 D-8
Q361 E-5
Q362 E-6
Q363 E-3
Q364 E-5
Q365 E-7
Q366 E-8
Q379 F-2
Q501 F-3
Q502 G-3
Q503 G-3
Q504 G-4
Q505 G-4
Q506 F-3
Q507 F-4
Q509 F-4
Q550 D-10
Q560 D-9
Q601 F-10
Q602 G-11
Q603 F-11
Q604 G-11
Q605 F-11
Q606 F-11
Q610 D-9
Q651 F-6
Q652 G-7
Q653 G-7
Q654 G-8
Q655 F-6
Q656 G-8
Q657 F-8
Q658 F-8
Q659 F-8
Q691 E-8
Q701 F-4
Q702 G-5
Q703 G-5
Q704 G-6
Q705 G-6
Q706 F-5
Q707 F-6
Q708 F-6
Q709 F-6
Q722 E-10
Q723 E-11
Q725 E-11
Q730 D-10
Q747 E-7
Q748 E-7
Q751 F-8
Q752 G-9
Q753 G-8
Q754 G-9
Q755 F-9
Q756 F-10
Q757 F-9
Q758 F-9
Q759 F-9
Q791 E-11
Q801 E-13
Ref. No. Location Ref. No. Location Ref. No. Location Ref. No. Location Ref. No. Location

1515
STR-K402
3-8. SCHEMATIC DIAGRAM –DIGITAL SECTION –•See page 20 for IC Block Diagram. •See page 7 for Waveforms.
IC B/D
IC B/D
(Page 17)

1616
STR-K402
3-9. PRINTED WIRING BOARD –DIGITAL SECTION –
DIGITAL
IC 1002
IC 1010
IC 1201
IC 1008
IC 1006
IC 1004
IC 1005
IC 1003
IC 1007
IC 1251
IC 1011
IC 1013
IC 1009
(Page 18)
(Page 14)
(Page 14)
112
13
24
25
48
37
36
CNS103
•See page 8 for Circuit Boards Location. There are a few cases that the part printed on
this diagram isn’t mounted in this model.
D1101 C-7
D1201 D-3
D1202 D-3
D1301 B-3
IC1002 A-2
IC1003 B-5
IC1004 B-7
IC1005 B-8
Ref. No. Location
•Semiconductor Location
Ref. No. Location
IC1006 C-7
IC1007 E-7
IC1008 D-6
IC1009 C-3
IC1010 B-3
IC1011 E-1
IC1013 B-3
IC1201 E-6
IC1251 E-5

1717
STR-K402
3-10. SCHEMATIC DIAGRAM –DISPLAY SECTION –•See page 21 for IC Pin Function. •See page 7 for Waveforms.
(Page 13)
(Page 15)

1818
STR-K402
3-11. PRINTED WIRING BOARD –DISPLAY SECTION –
(Page 14)
(Page 14)
(Page 16) (Page 19) (Page 19)
FOR FRASH
PROGRAMMING
(Page 14)
(DECODING)
MENU
IC 102
IC 103 IC 101
SOUND CONTROL
SOUND FIELD
1
44
34 33
23
22
11 12
•See page 8 for Circuit Boards Location. There are a few cases that the part printed on
this diagram isn’t mounted in this model.
Ref. No. Location
D002 E-7
D003 E-6
D004 E-6
D007 D-6
D008 C-8
D009 D-7
D010 D-9
D011 A-9
D014 B-5
D100 C-12
D101 A-6
D102 A-8
D103 C-6
D109 B-12
D110 B-12
IC101 B-13
IC102 B-7
IC103 B-10
Q008 D-12
Q009 C-5
Q100 A-8
Q101 A-7
Q103 D-3
Q104 D-3
•Semiconductor
Location

1919
STR-K402
3-12. SCHEMATIC DIAGRAM – VIDEO SECTION – • See page 20 for IC Block Diagram.
IC B/D
17
3-13. PRINTED WIRING BOARD –POWER SECTION –
(Page 14)
(Page 18)
(Page 14)
IC 950
•See page 8 for Circuit Boards Location.
3-14. PRINTED WIRING BOARD –VIDEO SECTION –
(Page 14)
(Page 18)
IC 1015
IC 1014
•See page 8 for Circuit Boards Location.
There are a few cases that the part printed on
this diagram isn’t mounted in this model.

2020
STR-K402
IC501 STK350-230 (MAIN BOARD)
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
V
SS
GND
V
CC
SUB
IC701 uPC2581V (MAIN BOARD)
IC702 uPC2581V (MAIN BOARD)
PROTECTOR
DRIVE
123 4 56 7 8 9 10 11 12 13 14 15
PRE
DRIVE
PRE
DRIVE
BIAS CIRCUIT
REG
MUTE
+VOUT1
–VOUT1
COMP1
NF1
IN1
GND
IN2
NF2
COMP2
–VOUT2 +VOUT2
VCC1 VCC2
VEE
DRIVE
3-15. IC BLOCK DIAGRAMS
IC1008 AK4527 (DIGITAL BOARD)
1
2
3
4
5
6
7
8
9
10
11
33
32
31
30
29
28
27
26
25
24
23
12 13 14 15 16 17 18 19 20 21 22
44 43 42 41 40 39 38 37 36 35 34
FORMAT
CONVERTER
AUDIO
INTERFACE
INPUT
CIRCUIT
OUTPUT
CIRCUIT
LOOP1 LOOP0/SDA/CDTI DIF1/SCL/CCLK DIF0/CSN P/SN MCLK DZF1 AVSS AVDD VREFH VCOM
DZF2
RIN+
RIN–
LIN+
LIN–
ROUT1
LOUT1
ROUT2
LOUT2
ROUT3
LOUT3
DEM1 DEM0
TVDD
DVDD
DVSS
PDN
ICKS2 ICKS1 ICKS0
CAD1 CAD0
SDOS
I2C
SMUTE
BICK
LRCK
SDTI1
SDTI2
SDTI3
SDTO
DAUX
DFS
IC1015 NJM2279D (VIDEO BOARD)
VIN3 V-
14
SW2
13
VIN1
12
MUTE1
11
VOUT1
10
NC
9
V+
8
1
SW1
2
AMP
VIN2
3
MUTE2
4
VOUT2
5
GND2
6
GND1
7
AMP
IC950 NJM2103D (STANDBY BOARD)
1
2
3
45
6
7
8
V+
VSB/SESIN
VSA
RESET
GND
OUTC
VSC
CR
VREF
+–
–+
–
+
–
+
Q
R S
IC1004 LC89055W-RA8 (DIGITAL BOARD)
46
43
40
37
34
31
47
44
41
38
35
32
48
45
42
39
36
33
25
26
27
28
29
30
3
6
9
12
15
18
2
5
8
11
14
17
1
4
7
10
13
16
24
23
22
21
20
19
X'TALL
DATA
RECOVER
TIMING
PLL
INPUT
MICRO COMPUTER
INTERFACE
FS
CALCULATION
LOCK
DETECTION
Pa, Pb
DETECTION
Cbit
DETECTION
CSFLAG
F0/P0/C0
F1/P1/C1
F2/P2/C2
VF/P3/C3
DVDD
DGND
AUTO
BPSYNC
ERROR
DO
DI
CE
CL
XSEL
MODE0
MODE1
DGND
DVDD
DOSEL0
DOSEL1
CKSEL0
CKSEL1
XMODE
AUDIO
ENPHA
XIN
XOUT
XMCK
DVDD
DGND
XSTATE
DATAO
DGND
BCK
CKOUT
AGND
AVDD
LPF
VIN
R
DVDD
DGND
DIN2
DIN1
DIN0
DOUT
DISEL