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Sony STR-K740P Service Manual
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Sony STR-K740P Service Manual

Fm stereo fm-am receiver
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SERVICE MANUAL
Ver 1.0 2002. 02
• STR-K740P/K840P are the tuner and the
amplifier section in HT-DDW740/DDW840.
Dolby Laboratories Licensing Corporation.
"DOLBY" the double-D symbol ; "AC-3" and "PRO LOGIC"
are trademarks of Dolby Laboratories Licensing Corporation.
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:
STR-K740P:
Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P:
STR-K740P:
Models of area code CEL,CEK
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P:
STR-K740P:
Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
STR-K840P:
STR-K740P:
Sony Corporation
9-873-544-01
2002B1600-1
Home Audio Company
© 2002.02
Published by Sony Engineering Corporation
STR-K740P/K840P
Photo : STR-K840P (SILVER model)
SPECIFICATIONS
100 W + 100 W
80 W + 80 W
1)
FRONT
:100 W/ch
CENTER
1)
: 100 W
SURR
1)
: 100 W/ch
1)
FRONT
: 80 W/ch
1)
CENTER
: 80 W
1)
SURR
: 80 W/ch
100 W + 100 W
2)
80 W + 80 W
2)
2)
FRONT
1)
: 100 W/ch
CENTER
1)
: 100 W
1)
SURR
: 100 W/ch
1)
FRONT
: 80 W/ch
1)
CENTER
: 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)
1)
SURR
: 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
STR-K740P:
80 W + 80 W
2)
Reference Power Output
(8 ohms 1 kHz, THD 10 %)
1)
STR-K840P:
FRONT
: 120 W/ch
CENTER
1)
SURR
1)
: 120 W/ch
1)
STR-K740P:
FRONT
: 100 W/ch
1)
CENTER
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
FM STEREO FM-AM RECEIVER
US Model
Canadian Model
AEP Model
UK Model
E Model
: 120 W
2)
2)
: 120 W
: 100 W
— Continued on next page —

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  • Page 1 AEP Model UK Model E Model Photo : STR-K840P (SILVER model) • STR-K740P/K840P are the tuner and the amplifier section in HT-DDW740/DDW840. Dolby Laboratories Licensing Corporation. “DOLBY” the double-D symbol ; “AC-3” and “PRO LOGIC” are trademarks of Dolby Laboratories Licensing Corporation.
  • Page 2 Power consumption Stereo: Area code Power consumption 11.2 dBf, 1 µV/75 ohms Usable sensitivity U, MX STR-K840P: 210 W STR-K740P: 180 W Mono: 76 dB Stereo: 70 dB STR-K840P: 300 VA STR-K740P: 260 VA Harmonic distortion at 1 kHz Mono: 0.3%...
  • Page 3 CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU PUBLISHED BY SONY.

  • Page 4: Table Of Contents

    STR-K740P/K840P MODEL IDENTIFICATION TABLE OF CONTENTS — BACK PANEL — 1. GENERAL ·········································································· 5 2. TEST MODE ······································································ 6 3. DIAGRAMS ········································································ 8 3-1. Circuit Board Location ·················································· 8 3-2. Block Diagrams – MAIN Section – ···························· 10 Parts No.

  • Page 5: General

    STR-K740P/K840P SECTION 1 GENERAL This section is extracted from instruction manual. FM MODE (Models of area code PRESET TUNING +/– (Except ALPHABETICAL ORDER CEL, CEK only) ed, (Except for for models of area code CEL, models of area code CEL, CEK) CEK) 3 (33, 54) 0 –...

  • Page 6: Test Mode

    STR-K740P/K840P SECTION 2 TEST MODE FACTORY PRESET MODE 3. Press the VIDEO button, confirm display * All preset contents are reset to the default setting. DIGITAL MONO MEMORY * Procedure: SP.OFF MULTI CH IN NEWS While depressing the VIDEO 1 and the 2CH buttons simul- taneously, press the power ?/1 button to turn on the main power.
  • Page 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.

  • Page 8: Diagrams

    STR-K740P/K840P SECTION 3 DIAGRAMS 3-1. Circuit Board Location AC SELCT board (E model only) STANDBY board POWER SW board VIDEO board MAIN board DIGITAL board HEADPHONE board DISPLAY board...
  • Page 9 STR-K740P/K840P THIS NOTE IS COMMON FOR PRINTED WIRING For printed wiring boards. • Waveform Note: BOARDS AND SCHEMATIC DIAGRAMS. • X : parts extracted from the component side. (In addition to this necessary note is printed in each DIGITAL Board •...

  • Page 10: Block Diagrams - Main Section

    STR-K740P/K840P 3-2. Block Diagrams – MAIN Section – IC201 ANALOG SOUND TUNER PACK PROC. L CH L IN8 75 Ω IC1601(1/3) COAXIAL R CH R-CH SYSTEM CONTROL. ANTENNA ST-DO J402 ST-DI L OUT L IN9 Q361 SLATCH MUTING L REC3...

  • Page 11: Display/Power Section

    STR-K740P/K840P – DISPLAY/POWER Section – R-CH J791 IC701 PHONES POWER AMP RY791 Q790 Q703 +V OUT2 RELAY BOOSTER DRIVE Q701,702 LIMITER TM602 RY701 • R-CH is omitted due to same as L-CH FRONT Q740 D731 Q710 • Signal Path MUTING...

  • Page 12: Printed Wiring Board - Digital Section

    STR-K740P/K840P 3-3. Printed Wiring Board – DIGITAL Section – • See page 8 for Circuit Boards Location. • Semiconductor • : Uses unleaded solder. Location Ref. No. Location D1001 D1101 D1501 D1502 D1601 D1905 D1906 D1907 IC1101 IC1102 IC1102 IC1105...

  • Page 13: Schematic Diagram - Digital Section (1/2)

    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...

  • Page 14: Schematic Diagram - Digital Section (2/2)

    STR-K740P/K840P • See page 9 for Waveform. • See page 25 for IC Pin Function Description. 3-5. Schematic Diagram – DIGITAL Section (2/2) –...

  • Page 15: Printed Wiring Board - Main Section

    STR-K740P/K840P 3-6. Printed Wiring Board – MAIN Section – • : Uses unleaded solder. • See page 8 for Circuit Boards Location. K740P:AEP,UK/K840P:AEP,UK K740P:AEP,UK/K840P:AEP,UK K740P:AEP,UK/K840P:AEP,UK IC801 IC802 IC201 IC601 IC701 IC702 IC401 IC501 Q503 Q504 Q703 Q704 Q653 Q654 Q753...

  • Page 16: Schematic Diagram - Main Section (1/2)

    STR-K740P/K840P 3-7. Schematic Diagram – MAIN Section (1/2) – • See page 23 for IC Block Diagrams.

  • Page 17: Schematic Diagram - Main Section (2/2)

    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...

  • Page 18: Printed Wiring Board - Display Section

    STR-K740P/K840P 3-9. Printed Wiring Board – DISPLAY Section – • See page 8 for Circuit Boards Location. • : Uses unleaded solder. • Semiconductor Location Ref. No. Location D100 D102 D103 D104 D105 D111 D112 D113 D114 IC100 IC101 IC102...

  • Page 19: Schematic Diagram - Display Section

    STR-K740P/K840P 3-10. Schematic Diagram – DISPLAY Section – • See page 24 for IC Block Diagrams. IC B/D...

  • Page 20: Printed Wiring Board - Video Section

    STR-K740P/K840P 3-11. Printed Wiring Board – VIDEO Section – 3-12. Schematic Diagram – VIDEO Section – • See page 24 for IC Block Diagrams. • : Uses unleaded solder. • See page 8 for Circuit Boards Location. IC807 IC B/D...

  • Page 21: Printed Wiring Board - Power Section

    STR-K740P/K840P 3-13. Printed Wiring Board – POWER Section – • : Uses unleaded solder. • See page 8 for Circuit Boards Location. K740P:US, CND/K840P:US, CND (CHASSIS) EXCEPT K740P:E/K840P:E K740P:E/K840P:E CNP801 (Page 15) CNP802 (Page 15)

  • Page 22: Schematic Diagram - Power Section

    STR-K740P/K840P 3-14. Schematic Diagram – POWER Section – F901 2.5V/250V : EXCEPT K740P:US,CND/K840P:US,CND,MX 6.3V/125V : K740P:US,CND/K840P:US,CND,MX...

  • Page 23: Ic Block Diagrams

    STR-K740P/K840P 3-15. IC Block Diagrams IC1101 LC89056W-E (DIGITAL BOARD) AUDIO C BIT PA/PB DETECT DETECT EMPHA SAMPLING FREQUENCY MICROCOMPUTER INTERFACE XSEL LOCK XOUT CLOCK DETECT XMCK 19 DVDD MODE0 MODE 18 DGND SELECT MODE1 XSTATE DGND DATAO DVDD LRCK DOSEL0...
  • Page 24 STR-K740P/K840P IC101 MC74ACT08N (DISPLAY BOARD) IC103 NJM2595D (VIDEO BOARD) 75Ω Driver 75Ω VI.OUT Driver 75Ω M.OUT Driver...

  • Page 25: Ic Pin Function Descriptions

    STR-K740P/K840P 3-16. IC PIN FUNCTION DESCRIPTIONS • IC1601 MB90478PF-G-120-BND (SYSTEM CONTROL) Pin No. Pin Name Description DATAO Audio data signal input from DIR GP9 signal input from DSP BST signal output to DSP HCS signal output to DSP HACN HACN signal input from DSP...
  • Page 26 STR-K740P/K840P Pin No. Pin Name Description Operation mode setting input RDS CLOCK RDS clock signal output (Not used) RDS DATA RDS data signal output (Not used) SIRCS Data signal input from the remote control sensor FUSE DETECT Fuse detect signal input...

  • Page 27: Exploded Views

    STR-K740P/K840P SECTION 4 EXPLODED VIEWS NOTE: • -XX, -X mean standardized parts, so they may • The mechanical parts with no reference number The components identified by mark 0 or have some differences from the original one. in the exploded views are not supplied.

  • Page 28: Chassis Section-1

    STR-K740P/K840P 4-2. Chassis Section-1 not supplied not supplied T901 not supplied not supplied not supplied Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 4-232-237-01 FOOT (DIA. 30) 4-238-193-81 BACK PANEL (HT4) (K840P:AR) 4-977-358-01 CUSHION 4-238-193-91 BACK PANEL (HT4) (K840P:MX)

  • Page 29: Chassis Section-2

    STR-K740P/K840P 4-3. Chassis Section-2 not supplied not supplied T901 not supplied not supplied not supplied Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks – Continued from page28 – * 65 3-703-244-00 BUSHING (2104), CORD 3-701-748-00 CLAMP...

  • Page 30: Electrical Parts List

    STR-K740P/K840P SECTION 5 AC SELECT DIGITAL ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • COILS When indicating parts by reference number, parts list may be different from the parts uH: µH please include the board name.
  • Page 31 STR-K740P/K840P DIGITAL Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C1513 1-164-156-11 CERAMIC CHIP 0.1uF D1905 8-719-053-18 DIODE 1SR154-400TE-25 C1514 1-164-156-11 CERAMIC CHIP 0.1uF D1906 8-719-053-18 DIODE 1SR154-400TE-25 C1515 1-126-964-11 ELECT 10uF 20.00% 50V D1907 8-719-053-18 DIODE 1SR154-400TE-25...
  • Page 32 STR-K740P/K840P DIGITAL Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < COIL > R1506 1-216-833-11 METAL CHIP 1/16W R1507 1-216-829-11 METAL CHIP 4.7K 1/16W L1901 1-216-864-11 METAL CHIP 1/16W R1508 1-216-845-11 METAL CHIP 100K 1/16W R1509...

  • Page 33: Digital Display

    STR-K740P/K840P DIGITAL DISPLAY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R1640 1-216-821-11 METAL CHIP 1/16W A-4728-362-A DISPLAY BOARD, COMPLETE (K740P) R1641 1-216-821-11 METAL CHIP 1/16W ******************************* R1642 1-216-833-11 METAL CHIP 1/16W A-4727-966-A DISPLAY BOARD, COMPLETE (K840P)
  • Page 34 STR-K740P/K840P DISPLAY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < TRANSISTOR > R123 1-249-421-11 CARBON 2.2K 1/4W F (K840P) Q100 8-729-119-78 TRANSISTOR 2SC2785TP-HFE (K840P) R124 1-249-421-11 CARBON 2.2K 1/4W F Q101 8-729-119-78 TRANSISTOR 2SC2785TP-HFE (K740P)
  • Page 35 STR-K740P/K840P DISPLAY HEADPHONE MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R168 1-249-409-11 CARBON 1/4W F 1-683-763-11 HEADPHONE BOARD R169 1-249-409-11 CARBON 1/4W F ***************** R170 1-249-429-11 CARBON 1/4W R171 1-249-429-11 CARBON 1/4W < CAPACITOR >...
  • Page 36 STR-K740P/K840P MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C433 1-126-964-11 ELECT 10uF 20.00% 50V C616 1-106-355-12 MYLAR 3300PF 200V C452 1-126-964-11 ELECT 10uF 20.00% 50V C617 1-106-355-12 MYLAR 3300PF 200V C454 1-126-964-11 ELECT 10uF 20.00% 50V...
  • Page 37 STR-K740P/K840P MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks C802 1-126-947-11 ELECT 47uF 20.00% 35V CC32 1-128-809-11 CERAMIC 100PF C803 1-165-498-11 ELECT 4700uF (K740P:AEP,UK/K840P:AEP,UK) (K740P) CC41 1-128-809-11 CERAMIC 100PF C803 1-165-707-11 ELECT 10000uF (K740P:AEP,UK/K840P:AEP,UK) (K840P)
  • Page 38 STR-K740P/K840P MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks D791 8-719-911-19 DIODE 1SS133T-72 Q604 8-749-010-26 TRANSISTOR MP1620-OPY-M D801 8-719-934-21 DIODE HZS30-1LTA Q605 8-729-140-82 TRANSISTOR 2SA988TP-PAFAEA D802 8-719-072-05 DIODE RBV-602LF-A Q606 8-729-140-82 TRANSISTOR 2SA988TP-PAFAEA D804 8-719-068-24 DIODE HZ5.6BP-TK...
  • Page 39 STR-K740P/K840P MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R402 1-249-417-11 CARBON 1/4W F R505 1-249-439-11 CARBON 1/4W R404 1-249-417-11 CARBON 1/4W F R510 1-249-421-11 CARBON 2.2K 1/4W F R405 1-249-417-11 CARBON 1/4W F R511...
  • Page 40 STR-K740P/K840P MAIN Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks R651 1-249-417-11 CARBON 1/4W F R722 1-249-419-11 CARBON 1.5K 1/4W F R652 1-249-439-11 CARBON 1/4W R723 1-249-437-11 CARBON 1/4W R653 1-249-416-11 CARBON 1/4W F R724 1-249-431-11 CARBON...
  • Page 41 STR-K740P/K840P MAIN POWER SW STANDBY Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks 0 R793 1-249-389-11 CARBON 1/4W F A-4676-982-A STANDBY BOARD, COMPLETE (K840P:MX) R794 1-215-867-00 METAL OXIDE ********************************** (K740P) A-4727-969-A STANDBY BOARD, COMPLETE R794 1-215-868-00 METAL OXIDE...
  • Page 42 STR-K740P/K840P STANDBY VIDEO Ref. No. Part No. Description Remarks Ref. No. Part No. Description Remarks < TRANSISTOR > < IC > Q901 8-729-119-79 TRANSISTOR 2SC2785TP-FEK IC103 6-701-890-01 IC NJM2595D Q921 8-729-281-53 TRANSISTOR 2SC1815GR-TPE2 IC804 8-759-701-65 IC NJM79M05FA IC807 8-759-039-69 IC uPC7805AHF <...
  • Page 43 STR-K740P/K840P Ref. No. Part No. Description Remarks MISCELLANEOUS *************** 1-773-250-11 WIRE (FLAT TYPE) (27 CORE) 1-575-662-31 WIRE (FLAT TYPE) (5 CORE) (K840P:AR,MX) 1-769-844-11 WIRE (FLAT TYPE) (5 CORE) (K740P/K840P:US,CND,AEP,UK,E,MY,SP) 1-693-577-21 TUNER PACK (K740P:US,CND,E/K840P:US,CND,E,MX) 1-693-578-21 TUNER PACK (K740P:AEP,UK/K840P:AEP,UK) 1-693-580-21 TUNER PACK (K740P:MY,SP/K840P:MY,SP,AR)
  • Page 44 STR-K740P/K840P REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the upper right on the revised page allows you to jump to the next revised page. Ver. Date Description of Revision...

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