Sony STR-K740P,STR-K840P Service Manual

STR-K740P/K840P

US Model

Canadian Model

AEP Model

UK Model

E 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 Corporation

Home Audio Company
Published by Sony Engineering Corporation

9-873-544-01

2002B1600-1

© 2002.02

POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:

With 8 ohm loads, both channels driven, from
40 – 20,000 Hz; rated 100 watts (STR-K840P
only)/80 watts (STR-K740P only) per channel
minimum RMS power, with no more than

0.09 % total harmonic distortion from 250
milliwatts to rated output (Models of area code
U only).

Amplifier section

POWER OUTPUT
Models of area code U, CA
Rated Power Output at Stereo Mode

(8 ohms 40 Hz – 20 kHz, THD 0.09 %)
STR-K840P: 100 W + 100 W
STR-K740P: 80 W + 80 W

Reference Power Output

(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: FRONT

1)

:100 W/ch

CENTER

1)

: 100 W

SURR

1)

: 100 W/ch

STR-K740P: FRONT

1)

: 80 W/ch

CENTER

1)

: 80 W

SURR

1)

: 80 W/ch

Models of area code CEL,CEK
Rated Power Output at Stereo Mode

(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: 100 W + 100 W

2)

STR-K740P: 80 W + 80 W

2)

Reference Power Output

2)

(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: FRONT

1)

: 100 W/ch

CENTER

1)

: 100 W

SURR

1)

: 100 W/ch

STR-K740P: FRONT

1)

: 80 W/ch

CENTER

1)

: 80 W

SURR

1)

: 80 W/ch

Models of area code AR, SP
Rated Power Output at Stereo Mode

(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: 90 W + 90 W

Reference Power Output

2)

(8 ohms 1 kHz, THD 10 %)
STR-K840P: FRONT

1)

: 120 W/ch

CENTER

1)

: 120 W

SURR

1)

: 120 W/ch

Models of other area code
Rated Power Output at Stereo Mode

(8 ohms 1 kHz, THD 0.7 %)
STR-K840P: 100 W + 100 W

2)

STR-K740P: 80 W + 80 W

2)

Reference Power Output

2)

(8 ohms 1 kHz, THD 10 %)
STR-K840P: FRONT

1)

: 120 W/ch

CENTER

1)

: 120 W

SURR

1)

: 120 W/ch

STR-K740P: FRONT

1)

: 100 W/ch

CENTER

1)

: 100 W

SURR

1)

: 100 W/ch

1) Depending on the sound field settings and the
source, 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 the
amplifier 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

Tone

Gain levels: ±6 dB, 1 dB step

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

AM tuner section

Tuning range
Models of area code U, CA

With 10-kHz tuning scale: 530 – 1710 kHz

6)

With 9-kHz tuning scale: 531 – 1710 kHz

6)

Models of area code E, AR, MX

With 10-kHz tuning scale: 530 – 1610 kHz

6)

With 9-kHz tuning scale: 531 – 1602 kHz

6)

Models of area code MY, SP, CEL, CEK

With 9-kHz tuning scale: 531 – 1602 kHz

Antenna Loop antenna

Intermediate Frequency

450 kHz

Usable sensitivity 50 dB/m (at 1,000 kHz or

999 kHz)

S/N 54 dB (at 50 mV/m)
Harmonic distortion 0.5 % (50 mV/m, 400 Hz)

Selectivity

At 9 kHz: 35 dB
At 10 kHz: 40 dB

6) You can change the AM tuning scale to 9 kHz or
10 kHz. After tuning in any AM station, turn off
the receiver. Hold down PRESET TUNING + and
press . 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

Sensitivity: –
Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)

Sensitivity: –
Impedance: –
S/N: 100 dB
(A, 20 kHz LPF)

Voltage: 250 mV
Impedance: 10 kilohms

Voltage: 2 V
Impedance: 1 kilohms

General

Power 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 W

STR-K740P: 180 W

CA STR-K840P: 300 VA

STR-K740P: 260 VA

CEL, CEK, MY, SP, STR-K840P: 180 W
E, 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 6/8
inches) including
projecting parts and
controls

Mass (Approx.) 7.0 kg (15 lb 7 oz)

Design and specifications are subject to change
without 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 only

4) INPUT SHORT (with sound field and tone
bypassed).

5) Weighted network, input level.

10 Hz – 50 kHz
+0.5/–2 dB (with sound
field, and tone bypassed)

Sensitivity: 250 mV
Impedance: 50 kilohms
S/N

4)

: 96 dB

(A, 250 mV

5)

)

• Abbreviation
U : 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.

3

STR-K740P/K840P

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 ON 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:
Check the antenna terminals, metal trim, “metallized” knobs, screws,
and all other exposed metal parts for AC 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 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. Follo w the manufactur ers’ 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-operated A C voltmeter . The “limit” indication
is 0.75 V, so analog meter s must ha v e an accurate lo w-v olta ge
scale. The Simpson 250 and Sanwa SH-63Trd ar e 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

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

To Exposed Metal

Parts on Set

0.15 µF

1.5 kΩ

AC
Voltmeter
(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 solder

Boards requiring use of unleaded solder are printed with the lead­free mark (LF) indicating the solder contains no lead.
(Caution: Some printed circuit boards may not come printed with
the lead free mark due to their particular size.)

: LEAD FREE MARK

Unleaded 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 be
applied to the solder joint for a slightly longer time.
Soldering irons using a temperature regulator should be set to
about 350°C.
Caution: The printed pattern (copper foil) may peel away if the
heated tip is applied for too long, so be careful!

• Strong viscosity

Unleaded solder is more viscous (sticky , less prone to flo w) than
ordinary solder so use caution not to let solder bridges occur such
as on IC pins, etc.

• Usable with ordinary solder

It is best to use only unleaded solder but unleaded solder may
also be added to ordinary solder.

4

STR-K740P/K840P

TABLE OF CONTENTS

1. GENERAL

·········································································· 5

2. TEST MODE ······································································6

3. DIAGRAMS ········································································ 8

3-1. Circuit Board Location ··················································8
3-2. Block Diagrams – MAIN Section – ···························· 10

– DISPLAY/POWER Section –··································· 11
3-3. Printed Wiring Board – DIGITAL Section –··············· 12
3-4. Schematic Diagram – DIGITAL Section (1/2) –·········13
3-5. Schematic Diagram – DIGITAL Section (2/2) –·········14
3-6. Printed Wiring Board – MAIN Section – ···················· 15
3-7. Schematic Diagram – MAIN Section (1/2) – ··············16
3-8. Schematic Diagram – MAIN Section (2/2) – ··············17
3-9. Printed Wiring Board – DISPLAY Section – ··············18
3-10.Schematic Diagram – DISPLAY Section – ················· 19
3-11.Printed Wiring Board – VIDEO Section – ·················· 20
3-12.Schematic Diagram – VIDEO Section – ·····················20
3-13.Printed Wiring Board – POWER Section –················· 21
3-14.Schematic Diagram – POWER Section – ··················· 22
3-15.IC Block Diagrams ······················································ 23
3-16.IC PIN FUNCTION DESCRIPTIONS ······················· 25

4. EXPLODED VIEWS ······················································ 27

4-1. Front Panel Section ····················································· 27
4-2. Chassis Section-1 ························································ 28
4-3. 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/K840P

SECTION 1

GENERAL

This section is extracted
from instruction manual.

g

+
–

1 74 523

6

90qaqsqdqf qg qhqjqkqlw; waws8

FM MODE (Models of area code

CEL, CEK only) ed, (Except for
models of area code CEL, CEK)

ef (32)
INPUT MODE qg (22)
IR (receptor) 4 (39, 46, 52)
LEVEL 0 (16, 20, 28, 57)

M

MASTER 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-DDW840

only) qf (22)
MUTING wf8 (22, 50)

N – S

NAME (36)
PHONES (jack) ek (22, 51)
PRESET/PTY SELECT +/–

(Models of area code CEL, CEK

only) 3 (33, 34)

PRESET TUNING +/– (Except

for 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 – Z

TREBLE +/– 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 – 9

2 CH wh (26)

A – D

A.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, C

9 (25)
Digital Cinema Sound (indicator)

qs (24)
DIMMER ej (23)
DISPLAY 2 (23, 34, 52)
Display qa (23)
DVD/LD wa (22)

E – L

ENTER 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

• Abbreviation
CEK : UK model.
CEL : AEP model.

6

STR-K740P/K840P

SECTION 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 simul­taneously, press the po wer

?/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 simul­taneously, press the power

?/1

button again. The message
“FACTORY” appears and the present contents are reset to the
default values.

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+ 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.

* 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 po wer

?/1

button
to 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 on
one after another.

* Procedure:

While depressing the MD/T APE and the SHIFT b uttons simul­taneously, press the po wer

?/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 Sound
LED turn on.

3. Press the VIDEO button, confirm display

MULTI CHANNEL DECODING , 2CH , SURR and NAME
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, b ut also the other buttons such as
DVD/LD , TV/SAT , MD/TAPE , CD , TUNER and AUX can
be 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 upon
completion of repair.

* Procedure:

While depressing the MODE button, press the power

?/1

button
to turn on the main power.
The message “SURR. CLR.” appears and initialization is
performed.

DEMONSTRATION MODE

* Demonstration is performed.
* Procedure :

While depressing the SET UP button, press the power

?/1

button. The message appears and demonstration is performed.

* To finish DEMONSTRATION MODE, press the power

?/1

button 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 buttons
simultaneously, press the po wer

?/1

button to turn on the main
power . The model name, destination and the software version are
displayed.

KEY CHECK MODE

* Button check
* Procedure:

While depressing the VIDEO 1 and the SHIFT buttons
simultaneously, press the po wer

?/1

button to turn on the main
power.
“REST 39” appears. (AEP, UK, model: “RESET 38”)
Every pressing of any button other than ?/1 and SPEAKERS
counts down the buttons. The b uttons 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 48”, “VOL MAX” appear.

SW

LSLCR

SSR

SLEEP
SP.OFF

( ( ( L F E ) ) )

DIGITAL

OPT COAX MULTI CH IN

PRO LOGIC DTS MPEGSTEREO MONORDS 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-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 by
the tuner, and sets up the broadcasts. Be sure to start scanning
after 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/K840P

SECTION 3

DIAGRAMS

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 and
tantalums.

• All resistors are in Ω and 1/

4

W or less unless otherwise

specified.

• % : 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 produc­tion tolerances.

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

F : FM
J : CD (ANALOG)
c : DVD (DIGITAL)

• Abbreviation
CND : Canadian model
MY : Malaysia model
SP : Singapore model
AR : Argentine model
MX : Mexican model

THIS NOTE IS COMMON FOR PRINTED WIRING
BOARDS AND SCHEMATIC DIAGRAMS.
(In addition to this necessary note is printed in each
block.)

Note:

The components identified by
mark 0 or dotted line with mark
0 are critical for safety.
Replace only with part number
specified.

Note:

Les composants identifiés par
une marque 0 sont critiques
pour la sécurité.
Ne les remplacer que par une
pièce 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.

CE

1010

STR-K740P/K840P

3-2. Block Diagrams – MAIN Section –

AUDIO IN

AUDIO IN

AUDIO IN

MULTI
CH IN

FRONT

SURROUND

CENTER

SUB WOOFER

J401

PROC.

L IN9

2

L REC3

67

L IN7

71

L IN2

63

L REC1

61

L IN1

62

51

L OUT

L IN5

69

47

SL OUT

39

C OUT

35

SW OUT

MUTING

Q361

DATA

20

CLK

21

LATCH

22

MUTING

Q365

MUTING

Q363

MUTING

Q364

15

CLK

SDA

SCL

16

LATCH

14

DATA

SYSTEM CONTROL

IC1601(2/3)

J404

DVD/LD

IN

VIDEO 2

IN

J1101

35

62

IC1102

DIGITAL AUDIO

I/F RECEIVER

IC1101

L

DIN2

5

DO

35

DI

36

CLK

38

CE

37

ERROR

34

XSTATE

17

XMODE

48

13

CK OUT

14

BCK

15

LRCK

16

DATAO

IC1102

X1101

12.288MHz

AUDIO DSP

IC1201

KFSI0

22

SDI2

30

HCLK

34

HCS

36

HACN

32

PM

113

BST

56

XRST

2

23

SDO1

24

SDO2

25

SDO3

BCKI2

29

LRCKI2

28

IC1202

SRAM

AUDIO CODEC

IC1501

MCLKI

39

CDT1

43

CCLK

42

CS

41

PD

17

S.MUTE

3

27

L OUT1

BCK

4

LRCK

5

SDTO

9

SDTI1

6

SDTI2

7

SDTI3

8

25

L OUT2

23

L OUT3

24

R OUT3

LIN+

30

LIN-

29

21

IC1502

67

IC1502

ANALOG SOUND

AL IN

11

SL

13

16

15

AL OUT

10

DL IN

27

29

31

32

ASL IN

ASW IN

AC IN

SL

C

SW

DSL IN

DC IN

DSW IN

A

98 97 95 96 99100 94 1

DO

DI

CLK

CE

ERROR

XSTATE

CKSEL1

DATA0

20

HCLK

4

HCS

5

HACN

7PM3

BST

6

XRST

10

CDT1

12

SCL

13CS8PD9

SMUTE

24

ANA/DIG

MUTING

CONT

Q1601,1602

21

5 6

34 33

F.MUTING

MUTING
SWITCH

Q379

49MD0

51

MD2

28

SP SWITCH/FLASH 1

27

FLASH 2

MD0

VDD

MD2

FLASH 1

FLASH 2

RESET

+3.3V

CNS3

B

J403

J402

CD

MD/TAPE

DVD/LD

VIDEO 2

AUDIO OUT

OPTICAL

IN

IC1105

DIN1

4

• Signal Path

• R-CH is omitted due to same as L-CH.

: FM

: CD(ANALOG)

: DVD (DIGITAL)

22 21

XIN XOUT

93

XMODE

CKSEL1

47

GP9

68

HD OUT

35

HD IN

33

2

GP9

18

HD OUT

19

HD IN

9

MCLK1

12

MCLK2

X1201

13.5MHz

14

SCK OUT

20

BCKO1

19LRCKO

18SDI1

24AUDIO

GP8

69

EXLOCK

59

L IN8

1

FLASH

FOR

PROGRAMMING

TUNER PACK

FM

75 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)

DO

76

J200

V1 OUT

15

V1

13

M.OUT

1

14

SW1

VIDEO SELECT

VIDEO OUT

VIDEO OUT

VIDEO 1

MONITOR

J201

V2

5

DVD

3

DVD/LD

VIDEO 1

VIDEO IN

VIDEO IN

VIDEO IN

VIDEO 2

IC103

10

SW2

4

SW3

6

SW4

2

SW5

SLATCH

78

STEREO

74

TUNED

73

MUTING

75

RDS-DATA

RDS DATA

53

RDS-INT

RDS CLOCK

52

FM SIG OUT

RDS SIGNAL

43

SW1

90

SW2

89

SW3

88

SW4

87

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 –

IN2

8

12

+V OUT2

POWER AMP

IC701

POWER AMP

IC702

9

NF2

LIMITER

Q701,702

11

-V OUT2

IN2

12

+V OUT2

9

NF2

11

-V OUT2

BOOSTER

Q703

BOOSTER

Q704

CURRENT

DETECT

Q705,706

AF POWER

PROTECT

Q740

LIMITER

Q651,652

BOOSTER

Q653

BOOSTER

Q654

CURRENT

DETECT

Q655,656

IN+

1

6

+V OUT

POWER AMP

IC501

2

IN-

LIMITER

Q501,502

5-V OUT

BOOSTER

Q503

BOOSTER

Q504

CURRENT

DETECT

Q505,506

D721

PROTECT

SWITCH

Q722,723,725

RELAY
DRIVE

Q790

RY791

RELAY
DRIVE

Q710

RY701

D731

RELAY
DRIVE

Q610

RY601

D733

RELAY
DRIVE

Q550

RY501

D734

IC401

5

7

RELAY
DRIVE

Q560

RY560

L

R

SR

SL

C

R-CH

R-CH

R-CH

PHONES

TM601

TM602

AUDIO

OUT

J405

67

PROTECTOR

68

HEADPHONE RELAY

72

PREOUT/FRONT RELAY

70

REAR RELAY

71

CENTER RELAY

69

WOOFER RELAY

LED DRIVE

Q100-104

RV102

ENCODER

3 1

VOL(B)59VOL(A)

60

POWER KEY

56

?/1

S145

77

RSTX

48

STOP

54

SIRCS

55

FUSE DETECT

REMOTE
CONTROL
RECEIVER

1

IC102

D910-913

AC
IN

T902

RY901

D915

F901

D914

RELAY
DRIVE

Q901

D820-823

23

VCC5

84

VCC3

-5V
REG

3 2

+5V
REG

3 1

-7V
REG

3 2

+7V
REG

1 3

AUDIO

+7V

VIDEO

+5V

VIDEO

-5V

IC801

IC802

IC807

IC804

POWER RELAY

66

RELAY

+B

D902-905

82 83

X0

X1

X1601

20.0MHz

F1

F2

L

SLSL

C

SW

A

MUTING

1

MUTING

1

POWER
MUTING

Q747,748

22

AC MUTING

J791

FLUORESCENT

INDICATOR TUBE

FL101

61

DIN

62

CLK

63

FL_STB

7

DIN8CLK9STB

14 29

SEG1-16

42 31

GRID1-12

F1 F2

1

SW1

2

SW2

3

SW3

4

SW4

FL DRIVE

IC100

D111-114

29

BLUE LED

30

MODE LED

31

2CH LED

32

AFD LED

26

DCS LED

FUNCTION

KEY

A/D0

38

S110-119S100-109

FUNCTION

KEY

A/D1

39

FUNCTION

KEY

A/D2

40

S120-128

FUNCTION

KEY

A/D3

41

S130-137,
S143,144

B

RESET

SYSTEM CONTROL

IC1601(3/3)

• Signal Path

• R-CH is omitted due to same as L-CH

: FM

AF POWER

PROTECT

Q640

AF POWER

PROTECT

Q540

IC601

21

FRONT

SURROUND

CENTER

IC601

57

25

HP DETECT

BUFFER

IC101

D100-104

35

AVCC

+3.3V

REG

3 1

IC1904

AUDIO

-7V

D899

D898

+10V

REG

3 1

TUNER
+10V

IC1902

T901

+3.3V REG

Q471

Q921

AC DET

+3.3V

REG

3 1

IC1905

1 2

IC1602

TUNER
+3.3V

+3.3V

D802

+B

-B

-B SW

Q691,692

-30V REG

Q801

FL101

-30V

POWER AMP

-B

+5V
REG

3 1

IC1903

+5V

+2.5V
REG

5

+2.5V

+3.3V
REG

2

4

IC1901

+3.3V

+5V
REG

3 1

IC1503

AUDIO

+5V

SPEAKERS

SUB

WOOFER

MASTER
VOLUME

8

Q107-111

LED

DRIVE

RESET

+3.3V(STBY)

K740P:AEP,UK
K840P:AEP,UK

S901

VOLTAGE

SELECTOR

K740P:E/K840P:E MODEL ONLY

g

1212

STR-K740P/K840P

• See page 8 for Circuit Boards Location.

3-3. Printed Wiring Board – DIGITAL Section –

IC1102

IC1502

IC1501

IC1101

IC1552

IC1201

IC1202

IC1601

IC1604

IC1602

IC1105

IC1503

IC1904

IC1902

IC1905

IC1901

IC1903

11P:EXCEPT K740P:AEP,UK/K840P:AEP,UK
15P:K740P:AEP,UK/K840P:AEP,UK

K740P:AEP,UK/K840P:AEP,UK

• : Uses unleaded solder.

Ref. No. Location

D1001 A-2
D1101 A-3
D1501 B-8
D1502 B-8
D1601 E-1
D1905 F-7
D1906 E-7
D1907 E-7

IC1101 A-3
IC1102 A-1
IC1105 A-6
IC1201 C-2
IC1202 C-3
IC1501 B-2
IC1502 B-1
IC1503 C-9
IC1552 B-1
IC1601 D-1
IC1602 E-1
IC1604 F-1
IC1901 E-7
IC1902 E-6
IC1903 F-7
IC1904 E-6

Q1601 D-1
Q1602 E-1

• Semiconductor

Location

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.