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STR-K740P/K840PUS Model
Canadian ModelAEP Model
UK ModelE Model
SERVICE MANUAL
FM STEREO FM-AM RECEIVER— Continued on next page —
SPECIFICATIONS
Ver 1.0 2002. 02
Dolby Laboratories Licensing Corporation.“DOLBY” the double-D symbol ; “AC-3” and “PRO LOGIC”are trademarks of Dolby Laboratories Licensing Corporation.
Photo : STR-K840P (SILVER model)
Sony CorporationHome Audio Company
Published by Sony Engineering Corporation
9-873-544-012002B1600-1
© 2002.02
POWER OUTPUT AND TOTALHARMONIC DISTORTION:
With 8 ohm loads, both channels driven, from40 – 20,000 Hz; rated 100 watts (STR-K840Ponly)/80 watts (STR-K740P only) per channelminimum RMS power, with no more than0.09 % total harmonic distortion from 250milliwatts to rated output (Models of area codeU only).
Amplifier sectionPOWER OUTPUTModels of area code U, CARated Power Output at Stereo Mode(8 ohms 40 Hz – 20 kHz, THD 0.09 %)STR-K840P: 100 W + 100 WSTR-K740P: 80 W + 80 W
Reference Power Output(8 ohms 1 kHz, THD 0.7 %)STR-K840P: FRONT1):100 W/ch
CENTER1): 100 WSURR1): 100 W/ch
STR-K740P: FRONT1): 80 W/chCENTER1): 80 WSURR1): 80 W/ch
Models of area code CEL,CEKRated Power Output at Stereo Mode(8 ohms 1 kHz, THD 0.7 %)STR-K840P: 100 W + 100 W2)
STR-K740P: 80 W + 80 W2)
Reference Power Output2)
(8 ohms 1 kHz, THD 0.7 %)STR-K840P: FRONT1): 100 W/ch
CENTER1): 100 WSURR1): 100 W/ch
STR-K740P: FRONT1): 80 W/chCENTER1): 80 WSURR1): 80 W/ch
Models of area code AR, SPRated Power Output at Stereo Mode(8 ohms 1 kHz, THD 0.7 %)STR-K840P: 90 W + 90 W
Reference Power Output2)
(8 ohms 1 kHz, THD 10 %)STR-K840P: FRONT1): 120 W/ch
CENTER1): 120 WSURR1): 120 W/ch
Models of other area codeRated Power Output at Stereo Mode(8 ohms 1 kHz, THD 0.7 %)STR-K840P: 100 W + 100 W2)
STR-K740P: 80 W + 80 W2)
Reference Power Output2)
(8 ohms 1 kHz, THD 10 %)STR-K840P: FRONT1): 120 W/ch
CENTER1): 120 WSURR1): 120 W/ch
STR-K740P: FRONT1): 100 W/chCENTER1): 100 WSURR1): 100 W/ch
1) Depending on the sound field settings and thesource, there may be no sound output.
2) Measured under the following conditions:
Area code Power requirements
E 240 V AC, 50 Hz
SP, CEL, CEK, AR 230 V AC, 50 Hz
MX 120 VAC, 60 Hz
• STR-K740P/K840P are the tuner and theamplifier section in HT-DDW740/DDW840.
2
STR-K740P/K840P
Inputs (Digital)
DVD/LD (Coaxial)
VIDEO 2 (Optical)
Outputs
MD/TAPE (OUT),VIDEO 1(AUDIO OUT)
SUB WOOFER
ToneGain levels: ±6 dB, 1 dB step
FM tuner sectionTuning range 87.5 - 108.0 MHz
Antenna terminals 75 ohms, unbalanced
Intermediate Frequency10.7 MHz
SensitivityMono: 18.3 dBf, 2.2 µV/75 ohmsStereo: 38.3 dBf, 22.5 µV/75 ohms
Usable sensitivity 11.2 dBf, 1 µV/75 ohmsS/NMono: 76 dBStereo: 70 dB
Harmonic distortion at 1 kHzMono: 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
AM tuner sectionTuning rangeModels of area code U, CAWith 10-kHz tuning scale: 530 – 1710 kHz6)
With 9-kHz tuning scale: 531 – 1710 kHz6)
Models of area code E, AR, MXWith 10-kHz tuning scale: 530 – 1610 kHz6)
With 9-kHz tuning scale: 531 – 1602 kHz6)
Models of area code MY, SP, CEL, CEKWith 9-kHz tuning scale: 531 – 1602 kHz
Antenna Loop antenna
Intermediate Frequency450 kHz
Usable sensitivity 50 dB/m (at 1,000 kHz or999 kHz)
S/N 54 dB (at 50 mV/m)
Harmonic distortion 0.5 % (50 mV/m, 400 Hz)
SelectivityAt 9 kHz: 35 dBAt 10 kHz: 40 dB
6) You can change the AM tuning scale to 9 kHz or10 kHz. After tuning in any AM station, turn offthe receiver. Hold down PRESET TUNING + andpress . All preset stations will be erased whenyou change the tuning scale. To reset the scale to10 kHz (or 9 kHz), repeat the procedure.
Video sectionInputsVideo: 1 Vp-p, 75 ohms
OutputsVideo: 1 Vp-p, 75 ohms
Sensitivity: –Impedance: 75 ohmsS/N: 100 dB(A, 20 kHz LPF)
Sensitivity: –Impedance: –S/N: 100 dB(A, 20 kHz LPF)
Voltage: 250 mVImpedance: 10 kilohms
Voltage: 2 VImpedance: 1 kilohms
GeneralPower requirements
Area code Power requirements
U, CA, MX 120 V AC, 60 Hz
CEL, CEK 230 V AC, 50/60 Hz
MY, SP, AR 220 – 230 V AC, 50/60 Hz
E 120/220/240 V AC, 50/60 Hz
Power consumption
Area code Power consumption
U, MX STR-K840P: 210 WSTR-K740P: 180 W
CA STR-K840P: 300 VASTR-K740P: 260 VA
CEL, CEK, MY, SP, STR-K840P: 180 WE, AR STR-K740P: 155 W
Power consumption (during standby mode)0.5 W
Dimensions 430 145 298 mm(16 7/8 5 6/8 11 6/8inches) includingprojecting parts andcontrols
Mass (Approx.) 7.0 kg (15 lb 7 oz)
Design and specifications are subject to changewithout notice.
Frequency response
MULTI CH IN3), CD,MD/TAPE, DVD/LD,VIDEO 1, 2
Inputs (Analog)
MULTI CH IN3), CD,MD/TAPE, DVD/LD,VIDEO 1, 2
3) HT-DDW840 only4) INPUT SHORT (with sound field and tone
bypassed).5) Weighted network, input level.
10 Hz – 50 kHz+0.5/–2 dB (with soundfield, and tone bypassed)
Sensitivity: 250 mVImpedance: 50 kilohmsS/N4): 96 dB(A, 250 mV5))
• AbbreviationU : US model.CA : Canadian model.CEL : AEP model.CEK : UK model.SP : Singapore model. (Malaysia model included.)MX : Mexican model.MY : Malaysia model.AR : Argentine model.
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STR-K740P/K840P
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITHMARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTSLIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESECOMPONENTS WITH SONY PARTS WHOSE PART NUMBERSAPPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTSPUBLISHED BY SONY.
After correcting the original service problem, perform thefollowing safety checks before releasing the set to the customer:Check the antenna terminals, metal trim, “metallized” knobs, screws,and all other exposed metal parts for AC leakage. Check leakage asdescribed below.
LEAKAGE
The AC leakage from any exposed metal part to earth groundand from all exposed metal parts to any exposed metal part havinga 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 RCAWT-540A. Follow the manufacturers’ instructions to use theseinstruments.
2. A battery-operated AC milliammeter. The Data Precision 245digital multimeter is suitable for this job.
3. Measuring the voltage drop across a resistor by means of aVOM or battery-operated AC voltmeter. The “limit” indicationis 0.75 V, so analog meters must have an accurate low-voltagescale. The Simpson 250 and Sanwa SH-63Trd are examples ofa passive VOM that is suitable. Nearly all battery operateddigital multimeters that have a 2V AC range are suitable. (SeeFig. A)
SAFETY CHECK-OUT
ATTENTION AU COMPOSANT AYANT RAPPORTÀ LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0 SUR LESDIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONTCRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NEREMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONYDONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OUDANS LES SUPPÉMENTS PUBLIÉS PAR SONY.
To Exposed Metal Parts on Set
0.15 µF 1.5 kΩACVoltmeter(0.75 V)
Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.
Notes on chip component replacement• Never reuse a disconnected chip component.• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Unleaded solderBoards requiring use of unleaded solder are printed with the lead-free mark (LF) indicating the solder contains no lead.(Caution: Some printed circuit boards may not come printed withthe lead free mark due to their particular size.)
: LEAD FREE MARKUnleaded solder has the following characteristics.• Unleaded solder melts at a temperature about 40°C higher than
ordinary solder.Ordinary soldering irons can be used but the iron tip has to beapplied to the solder joint for a slightly longer time.Soldering irons using a temperature regulator should be set toabout 350°C.Caution: The printed pattern (copper foil) may peel away if theheated tip is applied for too long, so be careful!
• Strong viscosityUnleaded solder is more viscous (sticky, less prone to flow) thanordinary solder so use caution not to let solder bridges occur suchas on IC pins, etc.
• Usable with ordinary solderIt is best to use only unleaded solder but unleaded solder mayalso be added to ordinary solder.
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STR-K740P/K840P
TABLE OF CONTENTS
1. GENERAL ·········································································· 5
2. TEST MODE ······································································ 6
3. DIAGRAMS ········································································ 83-1. Circuit Board Location ·················································· 83-2. Block Diagrams – MAIN Section – ···························· 10
– DISPLAY/POWER Section – ··································· 113-3. Printed Wiring Board – DIGITAL Section – ··············· 123-4. Schematic Diagram – DIGITAL Section (1/2) – ········· 133-5. Schematic Diagram – DIGITAL Section (2/2) – ········· 143-6. Printed Wiring Board – MAIN Section – ···················· 153-7. Schematic Diagram – MAIN Section (1/2) – ·············· 163-8. Schematic Diagram – MAIN Section (2/2) – ·············· 173-9. Printed Wiring Board – DISPLAY Section – ·············· 183-10.Schematic Diagram – DISPLAY Section – ················· 193-11.Printed Wiring Board – VIDEO Section – ·················· 203-12.Schematic Diagram – VIDEO Section – ····················· 203-13.Printed Wiring Board – POWER Section – ················· 213-14.Schematic Diagram – POWER Section – ··················· 223-15. IC Block Diagrams ······················································ 233-16. IC PIN FUNCTION DESCRIPTIONS ······················· 25
4. EXPLODED VIEWS ······················································ 274-1. Front Panel Section ····················································· 274-2. Chassis Section-1 ························································ 284-3. Chassis Section-2 ························································ 29
5. ELECTRICAL PARTS LIST ······································· 30
MODEL IDENTIFICATION— BACK PANEL —
Parts No.
MODEL PARTS No.K740P : US 4-238-189-2s
K740P : Canadian 4-238-189-3s
K740P : Malaysia,Singapore 4-238-189-4s
K740P : E 4-238-189-5s
K740P : AEP 4-238-189-6s
K740P : UK 4-238-189-7s
K840P : US 4-238-193-0s
K840P : Canadian 4-238-193-1s
K840P : Malaysia, Singapore 4-238-193-2s
K840P : E 4-238-193-3s
K840P : AEP 4-238-193-4s
K840P : UK 4-238-193-5s
K840P : Argentine 4-238-193-8s
K840P : Mexican 4-238-193-9s
5
STR-K740P/K840PSECTION 1GENERAL This section is extracted
from instruction manual.
g
+–
1 74 523 6 90qaqsqdqfqg qhqjqkqlw; waws8
FM MODE (Models of area codeCEL, CEK only) ed, (Except formodels of area code CEL, CEK)ef (32)
INPUT MODE qg (22)IR (receptor) 4 (39, 46, 52)LEVEL 0 (16, 20, 28, 57)
MMASTER VOLUME wd (20, 50)MD/TAPE qj (22)MEMORY eh (31, 33)MENU +/– e; (16, 28, 36, 37, 57)MENU </> ea (16, 28, 36, 37, 57)MODE wj (25, 30, 51)MULTI CHANNEL DECODING
(indicator) (HT-DDW840 only)7 (22)
MULTI CH IN (HT-DDW840only) qf (22)
MUTING wf
8
(22, 50)
N – SNAME (36)PHONES (jack) ek (22, 51)PRESET/PTY SELECT +/–
(Models of area code CEL, CEKonly) 3 (33, 34)
PRESET TUNING +/– (Exceptfor models of area code CEL,CEK) 3 (33, 54)
PTY (models of area code CEL,CEK only) ef (34)
SET UP 6 (4, 16, 37, 57)SHIFT eg (33)SLEEP (HT-DDW740 only) qf
(37)SURR qd (28, 57)
T – ZTREBLE +/– qh (30, 57)TUNER ws (22, 32, 33, 36)TUNING +/– 5 (32)VIDEO 1 qk (22)VIDEO 2 w; (22)
BUTTON DESCRIPTIONS
?/1 (power) 1 (4, 15, 20, 21,30, 31, 54)
ALPHABETICAL ORDER
0 – 92 CH wh (26)
A – DA.DEC wk (24, 26)AM (Except for models of area
code CEL, CEK) es (31, 32)BASS +/– wg (19, 30, 57)CD ql (22)CINEMA STUDIO EX A, B, C9 (25)
Digital Cinema Sound (indicator)qs (24)
DIMMER ej (23)DISPLAY 2 (23, 34, 52)Display qa (23)DVD/LD wa (22)
E – LENTER wl (36)FM (Except for models of area
code CEL, CEK) ed (31, 32)FM/AM (Models of area code
CEL, CEK only) es (31, 32)
ek ej eh eg ef ed es ea e; wl wk wj wh wg wf wd
• AbbreviationCEK : UK model.CEL : AEP model.
6
STR-K740P/K840PSECTION 2
TEST MODE
FACTORY PRESET MODE* All preset contents are reset to the default setting.* Procedure:
While depressing the VIDEO 1 and the 2CH buttons simul-taneously, press the power ?/1 button to turn on the main power.The message “FACTORY” appears and switch off the set.While depressing the VIDEO 1 and the 2CH buttons simul-taneously, press the power ?/1 button again. The message“FACTORY” appears and the present contents are reset to thedefault values.
AM CHANNEL STEP 9 KHZ/10 KHZSELECTION 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 thePRESET+ button, press the power ?/1 button to turn on themain power. Either the message “9 k STEP” or “10 k STEP”appears. Select the desired step.
* For US/Canadian/E model only
SPEAKER SIZE SELECTION MODE*Either Normal Speaker or Micro Satellite Speaker can be selected.*Procedure: While depressing the LEVEL button, press the power ?/1 buttonto turn the main power.Either the message “NORM. SP.” or “MICRO SP.” is displayed.Select the desired speaker size.
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 onone after another.
* Procedure:While depressing the MD/TAPE and the SHIFT buttons simul-taneously, press the power ?/1 button to turn on the main power.
1. All segments turn on.
MULTI CHANNEL DECODING , Digital Cinema Sound ,A.F.D. , MODE , 2CH and SET UP LED turn on.
2. Press the VIDEO button, confirm display.
A.F.D. , MODE , LEVEL , SET UP , and Digital Cinema SoundLED turn on.
3. Press the VIDEO button, confirm display
MULTI CHANNEL DECODING , 2CH , SURR and NAMELED turn on.
4. Press the VIDEO button, All segments turn off.
5. Every pressing of the VIDEO button turns on eachsegment and LED one after another in the same order.(Not only the VIDEO button, but also the other buttons such asDVD/LD , TV/SAT , MD/TAPE , CD , TUNER and AUX canbe used.)
SOUND FIELD CLEAR MODE* The preset sound field is cleared when this mode is activated.
Use this mode before returning the product to clients uponcompletion of repair.
* Procedure:While depressing the MODE button, press the power ?/1 buttonto turn on the main power.The message “SURR. CLR.” appears and initialization isperformed.
DEMONSTRATION MODE* Demonstration is performed.* Procedure :
While depressing the SET UP button, press the power ?/1button. The message appears and demonstration is performed.
* To finish DEMONSTRATION MODE, press the power ?/1button while the introduction message appears in the display.
SOFTWARE VERSION DISPLAY MODE* The software version is displayed.* Procedure:
While depressing the ENTER and the A.F.D buttonssimultaneously, press the power ?/1 button to turn on the mainpower. The model name, destination and the software version aredisplayed.
KEY CHECK MODE* Button check* Procedure:
While depressing the VIDEO 1 and the SHIFT buttonssimultaneously, press the power ?/1 button to turn on the mainpower.“REST 39” appears. (AEP, UK, model: “RESET 38”)Every pressing of any button other than ?/1 and SPEAKERScounts down the buttons. The buttons which are already countedonce are not counted again. When all buttons are pressed “REST00” appears.When MASTER VOLUME is rotated in clockwise direction,“VOL MIN”, “VOL 1” to “VOL 48”, “VOL MAX” appear.
SW
L
SL
C R
S SR
SLEEPSP.OFF
( ( ( L F E ) ) )
DIGITALOPT COAX MULTI CH IN
PRO LOGIC DTS MPEGSTEREO MONO RDS MEMORYMUTINGINFONEWSTAEQD.RANGE
D D
dBkHzmft.MHz
SW
L R
S
SLEEP
L F E
COAXPRO LOGIC MPEGSTEREO RDS
MUTINGINFOTAD.RANGED D
k m MHz
SL
C
SR
SP.OFF
( ( ( ) ) )
DIGITALOPT MULTI CH IN
DTS MONO MEMORYNEWSEQ
dB Hz ft.
7
STR-K740P/K840P
AUTO BETICAL MODE* This mode is installed in the Europe models only. When this mode
is used, the receiver scans the broadcasts that can be received bythe tuner, and sets up the broadcasts. Be sure to start scanningafter connecting the antenna.
* Procedure:1. Check that the antenna is connected.2. Press the ?/1 button to turn on the power while pressing the
MEMORY button.3. The message “AUTO-BETICAL SELECT” appears and the
receiver starts scanning.
8
STR-K740P/K840PSECTION 3DIAGRAMS
3-1. Circuit Board Location
VIDEO board
DIGITAL board
MAIN board
DISPLAY board
HEADPHONE board
POWER SW board
STANDBY board AC SELCT board (E model only)
99
STR-K740P/K840P
• Waveform
DIGITAL Board
1 IC1101 wa (XOUT)
4.4Vp-p
81ns (12.288MHz)
2 IC1201 9 (MCLK1)
3.3Vp-p
73ns (13.59MHz)
3 IC1601 id (XI)
2.8Vp-p
5ns (20MHz)
For schematic diagrams.Note:• All capacitors are in µF unless otherwise noted. p : pF. 50
WV or less are not indicated except for electrolytics andtantalums.
• All resistors are in Ω and 1/4 W or less unless otherwisespecified.
• % : indicates tolerance.• f : internal component.• 2 : nonflammable resistor.• 5 : fusible resistor.• C : panel designation.
• A : B+ Line.• B : B– Line.• 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 produc-tion tolerances.
• Waveforms are taken with a oscilloscope.• Circled numbers refer to waveforms.• Signal path.
F : FMJ : CD (ANALOG)c : DVD (DIGITAL)
• AbbreviationCND : Canadian modelMY : Malaysia modelSP : Singapore modelAR : Argentine modelMX : Mexican model
THIS NOTE IS COMMON FOR PRINTED WIRINGBOARDS AND SCHEMATIC DIAGRAMS.(In addition to this necessary note is printed in eachblock.)
Note:The components identified bymark 0 or dotted line with mark0 are critical for safety.Replace only with part numberspecified.
Note:Les composants identifiés parune marque 0 sont critiquespour la sécurité.Ne les remplacer que par unepièce portant le numéro spécifié.
Caution:Pattern face side: Parts on the pattern face side seen from(Side A) the pattern face are indicated.Parts face side: Parts on the parts face side seen from(Side B) the parts face are indicated.
For printed wiring boards.Note:• X : parts extracted from the component side.• a : Through hole.• f : internal component.• : Pattern from the side which enables seeing.
C
B
These are omitted.
E
Q
B
These are omitted.
C E
1010
STR-K740P/K840P
3-2. Block Diagrams – MAIN Section –
AUDIO IN
AUDIO IN
AUDIO IN
MULTICH IN
FRONT
SURROUND
CENTER
SUB WOOFER
J401
PROC.
L IN92
L REC367
L IN771
L IN263
L REC161
L IN162
51L OUT
L IN569
47SL OUT
39C OUT
35SW OUT
MUTINGQ361
DATA20
CLK21
LATCH22
MUTINGQ365
MUTINGQ363
MUTINGQ364
15
CLK
SDA
SCL
16
LATC
H
14
DATA
SYSTEM CONTROLIC1601(2/3)
J404
DVD/LDIN
VIDEO 2IN
J1101
3 5 6 2IC1102
DIGITAL AUDIOI/F RECEIVER
IC1101
L
DIN25
DO35
DI36
CLK38
CE37
ERROR34
XSTATE17
XMODE48
13CK OUT
14BCK
15LRCK
16DATAO
IC1102
X110112.288MHz
AUDIO DSPIC1201
KFSI022
SDI230
HCLK34
HCS36
HACN32
PM113BST56
XRST2
23SDO1
24SDO2
25SDO3
BCKI229
LRCKI228
IC1202
SRAM
AUDIO CODECIC1501
MCLKI39
CDT143
CCLK42
CS41
PD17
S.MUTE3
27L OUT1
BCK4
LRCK5
SDTO9
SDTI16
SDTI27
SDTI38
25L OUT2
23L OUT3
24R OUT3
LIN+30
LIN-29
2 1IC1502
6 7IC1502
ANALOG SOUND
AL IN11
SL
13
16
15
AL OUT10
DL IN27
29
31
32
ASL IN
ASW IN
AC IN
SL
C
SW
DSL IN
DC IN
DSW IN
A
98 97 95 96 99 100 94 1
DO DI
CLK CE
ERRO
R
XSTA
TE
CKSE
L1
DATA
0
20
HCLK
4
HCS
5
HACN
7
PM
3
BST
6
XRST
10
CDT1
12
SCL
13
CS
8
PD
9
SMUT
E
24
ANA/
DIG
MUTINGCONT
Q1601,1602
21
5 6
34 33
F.M
UTIN
G
MUTINGSWITCH
Q379
49MD0
51MD2
28SP SWITCH/FLASH 1
27FLASH 2
MD0
VDD
MD2
FLASH 1
FLASH 2
RESET
+3.3V
CNS3
B
J403
J402
CD
MD/TAPE
DVD/LD
VIDEO 2
AUDIO OUT
OPTICALIN
IC1105
DIN14
• Signal Path• R-CH is omitted due to same as L-CH.
: FM
: CD(ANALOG)
: DVD (DIGITAL)
22 21XIN XOUT
93
XMOD
E
CKSEL147
GP968
HD OUT35
HD IN33
2
GP9
18
HD O
UT
19
HD IN
9MCLK1
12MCLK2
X120113.5MHz
14SCK OUT
20BCKO1
19LRCKO
18SDI1
24AUDIO GP869
EXLOCK59
L IN81
FLASHFOR
PROGRAMMING
TUNER PACK
FM75 Ω
COAXIAL
AM
R-CH
ST-DI
ST-DO
CLK
CE
STEREO
TUNED
MUTING
FM
AM
R CH
L CH
SYSTEM CONTROL.IC1601(1/3)
DO76
J200
V1 OUT15
V113
M.OUT1 14SW1
VIDEO SELECT
VIDEO OUT
VIDEO OUT
VIDEO 1
MONITOR
J201
V25
DVD3DVD/LD
VIDEO 1
VIDEO IN
VIDEO IN
VIDEO IN
VIDEO 2
IC103
10SW2
4SW3
6SW4
2SW5
SLATCH78
STEREO74
TUNED73
MUTING75
RDS-DATA RDS DATA53
RDS-INT RDS CLOCK52FM SIG OUT RDS SIGNAL43
SW190
SW289
SW388
SW487
IN
OUT
IN
COAXIAL
OPTICAL
DIGITAL
ANTENNA
AEP, UK
D204
D203
-
-
D1101
IC201
D1601
SDA SCL
EEPROM
IC1604
1111
STR-K740P/K840P
– DISPLAY/POWER Section –
IN28
12+V OUT2
POWER AMPIC701
POWER AMPIC702
9NF2
LIMITERQ701,702
11-V OUT2
IN2
12+V OUT2
9NF2
11-V OUT2
BOOSTERQ703
BOOSTERQ704 CURRENT
DETECT
Q705,706
AF POWERPROTECT
Q740
LIMITERQ651,652
BOOSTERQ653
BOOSTERQ654 CURRENT
DETECT
Q655,656
IN+1
6+V OUT
POWER AMPIC501
2IN-
LIMITERQ501,502
5-V OUT
BOOSTERQ503
BOOSTERQ504 CURRENT
DETECT
Q505,506
D721
PROTECTSWITCH
Q722,723,725
RELAYDRIVE
Q790RY791
RELAYDRIVE
Q710RY701
D731
RELAYDRIVE
Q610RY601
D733
RELAYDRIVE
Q550RY501
D734
IC4015 7
RELAYDRIVE
Q560RY560
L
R
SR
SL
C
R-CH
R-CH
R-CH
PHONES
TM601
TM602
AUDIOOUT
J405
67
PROT
ECTO
R
68
HEAD
PHON
E RE
LAY
72
PREO
UT/F
RONT
REL
AY
70
REAR
REL
AY
71
CENT
ER R
ELAY
69
WOO
FER
RELA
Y
LED DRIVEQ100-104
RV102
ENCODER3 1
VOL(
B)
59
VOL(
A)
60
POW
ER K
EY
56
?/1
S145
77RSTX
48STOP
54SIRCS
55FUSE DETECT
REMOTECONTROLRECEIVER
1
IC102
D910-913
ACIN
T902
RY901
D915
F901
D914
RELAYDRIVE
Q901
D820-823
23VCC5
84VCC3
-5VREG
3 2
+5VREG
3 1
-7VREG
3 2
+7VREG
1 3AUDIO+7V
VIDEO+5V
VIDEO-5V
IC801
IC802
IC807
IC804
POW
ER R
ELAY
66
RELAY+B
D902-905
82 83
X0 X1
X160120.0MHz
F1
F2
L
SLSL
C
SW
A
MUTING1
MUTING1
POWERMUTING
Q747,748
22
AC M
UTIN
G
J791
FLUORESCENTINDICATOR TUBE
FL101
61
DIN
62
CLK
63
FL_S
TB
7
DIN
8
CLK
9
STB
14 29
SEG1-16
42 31
GRID1-12
F1 F2
1SW1
2SW2
3SW3
4SW4
FL DRIVEIC100
D111-114
29
BLUE
LED
30
MOD
E LE
D
31
2CH
LED
32
AFD
LED
26
DCS
LED
FUNCTIONKEY
A/D0
38
S110-119S100-109
FUNCTIONKEY
A/D1
39
FUNCTIONKEY
A/D2
40
S120-128
FUNCTIONKEY
A/D3
41
S130-137,S143,144
B RESET
SYSTEM CONTROLIC1601(3/3)
• Signal Path• R-CH is omitted due to same as L-CH
: FM
AF POWERPROTECT
Q640
AF POWERPROTECT
Q540
IC6012 1
FRONT
SURROUND
CENTER
IC6015 7
25
HP D
ETEC
T
BUFFERIC101
D100-104
35AVCC
+3.3VREG
3 1
IC1904
AUDIO-7V
D899
D898
+10VREG
3 1TUNER+10V
IC1902
T901
+3.3V REGQ471
Q921AC DET
+3.3VREG
3 1
IC1905
1 2
IC1602
TUNER+3.3V
+3.3V
D802
+B
-B
-B SWQ691,692
-30V REGQ801FL101
-30V
POWER AMP-B
+5VREG
3 1
IC1903
+5V
+2.5VREG
5+2.5V
+3.3VREG
2
4
IC1901
+3.3V
+5VREG
3 1
IC1503AUDIO+5V
SPEAKERS
SUBWOOFER
MASTERVOLUME
8
Q107-111LED
DRIVE
RESET
+3.3V(STBY)
K740P:AEP,UKK840P:AEP,UK
S901VOLTAGE
SELECTOR
K740P:E/K840P:E MODEL ONLY
g
1313
STR-K740P/K840P
3-4. Schematic Diagram – DIGITAL Section (1/2) – • See page 9 for Waveform. • See page 23 for IC Block Diagrams.
IC B/D
1414
STR-K740P/K840P
3-5. Schematic Diagram – DIGITAL Section (2/2) – • See page 9 for Waveform. • See page 25 for IC Pin Function Description.
1616
STR-K740P/K840P
3-7. Schematic Diagram – MAIN Section (1/2) – • See page 23 for IC Block Diagrams.
13
1717
STR-K740P/K840P
3-8. Schematic Diagram – MAIN Section (2/2) – • See page 23 for IC Block Diagrams.
IC B/D
IC B/D
IC B/D
1919
STR-K740P/K840P
3-10. Schematic Diagram – DISPLAY Section – • See page 24 for IC Block Diagrams.
IC B/D
2020
STR-K740P/K840P
• See page 8 for Circuit Boards Location.
3-11. Printed Wiring Board – VIDEO Section – 3-12. Schematic Diagram – VIDEO Section – • See page 24 for IC Block Diagrams.
IC807
IC804
IC103
• : Uses unleaded solder.
IC B/D
2121
STR-K740P/K840P
• See page 8 for Circuit Boards Location.3-13. Printed Wiring Board – POWER Section –
CNP801(Page 15)
1
2
3
CNP802(Page 15)
H
J
K740P:US, CND/K840P:US, CND
EXCEPT K740P:E/K840P:E
K740P:E/K840P:E
(CHASSIS)
1
2
3
1
2
3
4
5
• : Uses unleaded solder.