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Sony STR-K785 Service Manual

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3 7 63 1515 0

SERVICE MANUAL

Ver. 1.2 2007.07
• STR-K785 is the tuner and the amplifier
section in HT-DDW785 and HTP-78DW.
Manufactured under license from Dolby Laboratories.
"Dolby", "Pro Logic" and the double-D symbol are trademarks of
Dolby Laboratories.
"DTS" and "DTS Digital Surround" are registered trademarks of
Digital Theater Systems, Inc.
TE
Amplifier section
L 13942296513
1)
Power Output
Models of area code SP and SP6
Stereo mode (rated) (6 ohms 1 kHz, THD 1%)
2)
Surround mode
(reference) (6 ohms 1 kHz,
THD 10%)
Models of area code AUS
Stereo mode (rated) (6 ohms 120 Hz – 20 kHz,
THD 0.09%)
Stereo mode (rated) (6 ohms 1 kHz, THD 1%)
2)
Surround mode
(reference) (6 ohms 1 kHz,
THD 10%)
Models of area code AEP
Stereo mode (rated) (6 ohms, 1 kHz, THD 1%)
www
85 W + 85 W
.
Sony Corporation
9-887-648-03
Home Audio Division
2007G16-1
Published by Sony Techno Create Corporation
© 2007.07
http://www.xiaoyu163.com
Surround mode
THD 10%)
70 W + 70 W
RMS output
1)
Measured under the following conditions:
FRONT: 100 W per
Area code
channel
CENTER: 100 W
SP, SP6
SURROUND: 100 W per
AUS
channel
AEP
2)
Reference power output for front, center and
surround speakers. Depending on the sound field
settings and the source, there may be no sound
50 W + 50 W
output.
Inputs
85 W + 85 W
Analog
Digital (Coaxial)
RMS output
Outputs (Analog)
FRONT: 122 W per
SUB WOOFER
channel
Tone
CENTER: 122 W
SURROUND: 122 W per
Gain levels
channel
Reproduction frequency range:
x
ao
y
i
http://www.xiaoyu163.com
STR-K785
8
SPECIFICATIONS
Q Q
2)
3
6 7
1 3
(reference) (6 ohms, 1 kHz,
RMS output
FRONT:122 W
per channel
CENTER:122 W
SURROUND:122 W
per channel
Power requirements
230 V AC, 50 Hz
240 V AC, 50 Hz
230 V AC, 50 Hz
Sensitivity: 800 mV/
50 kohms
Impedance: 75 ohms
Voltage: 2 V/1 kohm
±6 dB, 1 dB step
28 – 20,000 Hz
MULTI CHANNEL AV RECEIVER
u163
.
2 9
9 4
2 8
AEP Model
Australian Model
1 5
0 5
FM tuner section
8
2 9
9 4
Tuning range
87.5 - 108.0 MHz
Antenna
FM wire antenna
Antenna terminals
75 ohms, unbalanced
Intermediate Frequency
10.7 MHz
AM tuner section
Tuning range
With 9-kHz tuning scale:
531 - 1,602 kHz
Antenna
Loop antenna
Intermediate Frequency
450 kHz
Video section
Inputs/Outputs
Video:
1 Vp-p, 75 ohms
COMPONENT VIDEO:
Y: 1 Vp-p, 75 ohms
P
B
75 ohms
P
R
75 ohms
80 MHz HD Pass Through
— Continued on next page —
m
co
9 9
E Model
2 8
9 9
/C
: 0.7 Vp-p,
B
/C
: 0.7 Vp-p,
R

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  Summary of Contents for Sony STR-K785

  • Page 1: Service Manual

    AEP Model E Model Ver. 1.2 2007.07 Australian Model • STR-K785 is the tuner and the amplifier section in HT-DDW785 and HTP-78DW. Manufactured under license from Dolby Laboratories. “Dolby”, “Pro Logic” and the double-D symbol are trademarks of Dolby Laboratories.
  • Page 2 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.
  • Page 3: Table Of Contents

    STR-K785 3 7 63 1515 0 TABLE OF CONTENTS GENERAL ..............4 TEST MODE ............... 10 ELECTRICAL ADJUSTMENT ......12 DIAGRAMS 4-1. Block Diagram – MAIN Section – ........14 4-2. Block Diagram – DISPLAY/POWER Section – ..... 15 4-3.
  • Page 4: General

    STR-K785 SECTION 1 3 7 63 1515 0 GENERAL This section is extracted from instruction manual. Receiver Front panel A.F.D. MOVIE MUSIC DISPLAY DIMMER AMP MENU ENTER MASTER VOLUME AUTO CAL MIC MEMORY PRESET TUNING VIDEO 1 VIDEO 2...
  • Page 5 STR-K785 3 7 63 1515 0 About the indicators on the display DIGITAL PRO LOGIC II MEMORY SLEEP OPT COAX D.RANGE STEREO MONO SL S SR Name Function Name Function A SW H Preset Lights up when audio signal is...
  • Page 6: Rear Panel

    STR-K785 3 7 63 1515 0 Rear panel DIGITAL ANTENNA OPTICAL VIDEO 1 MONITOR VIDEO 2 VIDEO IN VIDEO IN VIDEO IN VIDEO OUT VIDEO 2 MONITOR COMPONENT VIDEO DVD IN COAXIAL AUDIO AUDIO IN AUDIO IN AUDIO IN...
  • Page 7 Press to turn on or off the You can use the supplied remote RM-AAU006 (on/standby) Sony audio/video components to operate the receiver and to control the Sony that the remote is assigned to operate. audio/video components that the remote is If you press ?/1 (B) at the assigned to operate (page 51).
  • Page 8 STR-K785 3 7 63 1515 0 Name Function Name Function F DUAL MONO Press to select the language O ./> Press to skips tracks of the CD you want during digital player, DVD player, or tape broadcast. deck. G FM MODE...
  • Page 9 STR-K785 3 7 63 1515 0 Name Function Name Function Y TV/VIDEO , V/v/B/b After pressing AMP MENU Press TV/VIDEO and TV (D), DVD MENU (J), or (P) at the same time to select MENU (N), press V, v, B or the input signal (TV input or b to select the settings.
  • Page 10: Test Mode

    STR-K785 SECTION 2 3 7 63 1515 0 TEST MODE SOUND FIELD CLEAR MODE SWAP ALL MODE The preset sound field is cleared when this mode is activated. Use Procedure: this mode before returning the product to clients upon completion 1.
  • Page 11 STR-K785 3 7 63 1515 0 1. DCAC DSP Data Line Checking After press the DIMMER , DCAC Factory test mode will start, below display will show: “DCAC[][][]x” x = 1, 2, 3 If there is error happen, below display will show: x = 1 →...
  • Page 12: Electrical Adjustment

    STR-K785 SECTION 3 3 7 63 1515 0 ELECTRICAL ADJUSTMENT TUNER SECTION [FM Auto Stop Check] generator OUT (75 Ω ) Procedure: 1. Turn the power on. 2. Input the following signal from Signal Generator to FM antenna input directly.
  • Page 13: Diagrams

    STR-K785 Ver. 1.2 SECTION 4 3 7 6 3 1 5 1 5 0 DIAGRAMS THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. • Circuit Boards Location (In addition to this, the necessary note is printed in each block.) For Schematic Diagrams.
  • Page 14: Block Diagram - Main Section

    STR-K785 Ver. 1.1 4-1. BLOCK DIAGRAM – MAIN SECTION – 3 7 6 3 1 5 1 5 0 IC400 ANALOG SOUND TUNER PACK PROCESSOR 75 Ω COAXIAL L CH INL1 ANTENNA R CH R-CH IC1101(1/3) SYSTEM CONTROLLER TUNER +10V...
  • Page 15: Block Diagram - Display/Power Section

    STR-K785 Ver. 1.1 4-2. BLOCK DIAGRAM – DISPLAY/POWER SECTION – 3 7 6 3 1 5 1 5 0 R-CH J700 IC501 PHONES POWER AMP RY502 Q509 Q503 +V OUT2 RELAY BOOSTER DRIVE Q501,502 LIMITER TM600(1/2) • R-CH is omitted due to same as L-CH.
  • Page 16: Printed Wiring Board - Digital Board (Side A)

    STR-K785 Ver. 1.2 4-3. PRINTED WIRING BOARD – DIGITAL BOARD (SIDE A) – • See page 13 for Circuit Boards Location. :Uses unleaded solder. 3 7 6 3 1 5 1 5 0 VIDEO BOARD CNS250 • Semiconductor (Page 30) Location Ref.
  • Page 17: Printed Wiring Board - Digital Board (Side B)

    STR-K785 Ver. 1.2 4-4. PRINTED WIRING BOARD – DIGITAL BOARD (SIDE B) – • See page 13 for Circuit Boards Location. :Uses unleaded solder. 3 7 6 3 1 5 1 5 0 MAIN BOARD CN504 STANDBY (Page 21) BOARD •...
  • Page 18: Schematic Diagram - Digital Board (1/3)

    STR-K785 4-5. SCHEMATIC DIAGRAM – DIGITAL BOARD (1/3) – • See page 13 for Waveforms. • See page 32 for IC Block Diagrams. 3 7 6 3 1 5 1 5 0 C1352 FB1302 R1044 R1352 R1362 IC1352 C1314...
  • Page 19: Schematic Diagram - Digital Board (2/3)

    STR-K785 4-6. SCHEMATIC DIAGRAM – DIGITAL BOARD (2/3) – • See page 32 for IC Block Diagrams. 3 7 6 3 1 5 1 5 0 C1450 C1460 R1474 C1494 FB1452 IC1452 PCM1602APT C1491 R1475 R1493 R1472 R1494 C1454...
  • Page 20: Schematic Diagram - Digital Board (3/3)

    STR-K785 Ver. 1.2 4-7. SCHEMATIC DIAGRAM – DIGITAL BOARD (3/3) – • See page 13 for Waveform. • See page 32 for IC Block Diagram. • See page 36 for IC Pin Function Description. 3 7 6 3 1 5 1 5 0...
  • Page 21: Printed Wiring Board - Main Board

    STR-K785 4-8. PRINTED WIRING BOARD – MAIN BOARD – • See page 13 for Circuit Boards Location. :Uses unleaded solder. 3 7 6 3 1 5 1 5 0 VIDEO ADCC BOARD BOARD CNP2000 CNP156 SPEAKER (Page 25) J400 (Page 30) IMPEDANCE USE 6-16 Ω...
  • Page 22: Schematic Diagram - Main Board (1/3)

    STR-K785 4-9. SCHEMATIC DIAGRAM – MAIN BOARD (1/3) – • See page 33 for IC Block Diagram. 3 7 6 3 1 5 1 5 0 C424 C434 J402 R401 CC01 100P CC51 100P C433 R451 IC400 M61542FP C423...
  • Page 23: Schematic Diagram - Main Board (2/3), Headphone Board

    STR-K785 Ver. 1.2 4-10. SCHEMATIC DIAGRAM – MAIN BOARD (2/3), HEADPHONE BOARD – • See page 33 for IC Block Diagrams. 3 7 6 3 1 5 1 5 0 C514 D502 R515 0.01 1SS133T-72 CN701 Q507 IC501 C511...
  • Page 24: Schematic Diagram - Main Board (3/3), Adcc Board, Standby Board

    STR-K785 4-11. SCHEMATIC DIAGRAM – MAIN BOARD (3/3), ADCC BOARD, STANDBY BOARD – 3 7 6 3 1 5 1 5 0 R854 R853 D851 C851 ISS133T-77 R855 Q852 220k DTA124ESA-TP D852 R852 CN504 R857 R859 R858 Q851 2SC1815GR-TPE2...
  • Page 25: Printed Wiring Boards - Adcc Board, Headphone Board

    STR-K785 4-12. PRINTED WIRING BOARDS – ADCC BOARD, HEADPHONE BOARD – • See page 13 for Circuit Boards Location. :Uses unleaded solder. 3 7 6 3 1 5 1 5 0 MAIN BOARD CN701 (Page 21) J2000 AUTO CAL MIC...
  • Page 26: Printed Wiring Board - Standby Board

    STR-K785 4-13. PRINTED WIRING BOARD – STANDBY BOARD – • See page 13 for Circuit Boards Location. :Uses unleaded solder. 3 7 6 3 1 5 1 5 0 T901 POWER TRANSFORMER (MAIN) MAIN BOARD CNP901 (Page 21) TP900...
  • Page 27: Printed Wiring Board - Display Board

    STR-K785 4-14. PRINTED WIRING BOARD – DISPLAY BOARD – • See page 13 for Circuit Boards Location. :Uses unleaded solder. 3 7 6 3 1 5 1 5 0 R198 JW123 JW122 C108 FL101 (FLOURESCENT DISPLAY) IC102 R199 IC100...
  • Page 28: Printed Wiring Boards - Tuning Board, Power Board

    STR-K785 4-15. PRINTED WIRING BOARDS – TUNING BOARD, POWER BOARD – • See page 13 for Circuit Boards Location. :Uses unleaded solder. 3 7 6 3 1 5 1 5 0 TUNING BOARD DISPLAY BOARD CN101 (Page 27) CN103...
  • Page 29: Schematic Diagram - Display Board

    STR-K785 4-16. SCHEMATIC DIAGRAM – DISPLAY BOARD, TUNING BOARD, POWER BOARD – • See page 35 for IC Block Diagram. 3 7 6 3 1 5 1 5 0 C109 C108 0.22 0.22 R198 R199 FL101 R175 C101 0.22...
  • Page 30: Printed Wiring Board - Video Board

    STR-K785 4-17. PRINTED WIRING BOARD – VIDEO BOARD – • See page 13 for Circuit Boards Location. :Uses unleaded solder. 3 7 6 3 1 5 1 5 0 J251 COMPONENT VIDEO MONITOR OUT DVD IN VIDEO 2 IN...
  • Page 31: Schematic Diagram - Video Board

    STR-K785 4-18. SCHEMATIC DIAGRAM – VIDEO BOARD – • See page 34 for IC Block Diagrams. 3 7 6 3 1 5 1 5 0 IC807 +5V REG C208 C201 C210 IC807 J201 C214 R220 TA7805LS R201 C825 C826...
  • Page 32 STR-K785 3 7 6 3 1 5 1 5 0 • IC Block Diagrams – DIGITAL Board – IC1131 BR24L16FJ-WE2 IC1452 PCM1602APT 31 30 36 35 34 33 1 A0 16 K bit EEPROM ARRAY VCC3 FUNCTION AGND3 CONTROL...
  • Page 33 STR-K785 3 7 63 1515 0 – MAIN Board – IC501, IC601, IC701 STK350-530T-E 4.7kΩ STAND-BY CIRCUIT DRIVER DRIVER DRIVER DRIVER 47kΩ 33Ω 33Ω 11 12 IC400 M61542FP L 13942296513 Volume SLOUT INL5 INR5 SLOUT INL4 INR4 SLVIN INL3...
  • Page 34 STR-K785 3 7 63 1515 0 – VIDEO Board – IC251 NJM2586AL 75Ω CH1_IN1 CH1_OUT DRIVER BIAS CONT1 P.SAVE 75Ω CH1_IN2 CH2_OUT DRIVER BIAS CONT1 CONT2 75Ω CH1_IN3 CH3_OUT DRIVER BIAS CONT1 CH2_IN1 CH3_IN1 BIAS BIAS CH2_IN2 CH3_IN2 BIAS...
  • Page 35 STR-K785 3 7 63 1515 0 – DISPLAY Board – IC100 PT6315 Grid driver Multiplexed driver SEG19/GRID10 Command decoder LED1 SEG18/GRID11 LED2 Display memory LED3 SEG17/GRID12 24 bits x 12 words LED4 Timing generator key scan DOUT SEG16/KS16 L 13942296513...
  • Page 36 STR-K785 Ver. 1.1 3 7 63 1515 0 • IC Pin Function Description DIGITAL BOARD IC1101 MB90488BPF-G-174E1 (SYSTEM CONTROL) Pin No. Pin Name Description DATAO Audio data signal input from DIR GP9 signal input from DSP BST signal output to DSP...
  • Page 37 STR-K785 Ver. 1.1 3 7 63 1515 0 Pin No. Pin Name Description STOP AC off detect signal input Operation mode setting input Operation mode setting input Operation mode setting input RDS_CLK RDS clock signal input (AEP) / Not used (Fixed to “L”) (Except AEP) RDS_DATA RDS data signal input (AEP) / Not used (Fixed to “L”) (Except AEP)
  • Page 38 STR-K785 3 7 63 1515 0 Pin No. Pin Name Description Data signal output to DIR Data signal input from DIR ERROR PLL error muting signal input from DIR XSTATE XSTATE data signal input from DIR L 13942296513 u163...
  • Page 39: Exploded Views

    STR-K785 Ver. 1.2 SECTION 5 3 7 63 1515 0 EXPLODED VIEWS NOTE: • -XX and -X mean standardized parts, so they • Abbreviation The components identified by mark 0 or may have some difference from the original : Australian model dotted line with mark 0 are critical for safety.
  • Page 40: Chassis Section

    STR-K785 Ver. 1.2 3 7 63 1515 0 5-2. CHASSIS SECTION Q554 Q553 Q654 supplied Q604 Q503 Q504 Q653 Q703 Q603 Q704 supplied F901 supplied supplied T901 supplied supplied supplied L 13942296513 supplied Ref. No. Part No. Description Remark Ref.
  • Page 41: Electrical Parts List

    STR-K785 Ver. 1.2 SECTION 6 ADCC DIGITAL 3 7 63 1515 0 ELECTRICAL PARTS LIST NOTE: • Due to standardization, replacements in the • COILS uH: µH When indicating parts by reference number, parts list may be different from the parts please include the board name.
  • Page 42 STR-K785 Ver. 1.2 DIGITAL 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C1302 1-162-974-11 CERAMIC CHIP 0.01uF C1511 1-100-566-91 CERAMIC CHIP 0.1uF C1303 1-100-566-91 CERAMIC CHIP 0.1uF C1513 1-100-566-91 CERAMIC CHIP 0.1uF...
  • Page 43 1-216-821-11 METAL CHIP 1/10W IC1301 8-759-825-15 IC LC89056W-E IC1303 8-759-242-70 IC TC7WU04F R1118 1-216-821-11 METAL CHIP 1/10W IC1352 6-600-466-01 IC TORX147L (SONY) (VIDEO 1/OPTICAL) R1119 1-216-821-11 METAL CHIP 1/10W IC1353 6-600-466-01 IC TORX147L (SONY) (VIDEO 2/OPTICAL) R1120 1-216-821-11 METAL CHIP 1/10W R1121...
  • Page 44 STR-K785 DIGITAL 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R1251 1-216-840-11 METAL CHIP 1/10W R1252 1-216-840-11 METAL CHIP 1/10W R1494 1-216-864-11 SHORT CHIP R1260 1-216-821-11 METAL CHIP 1/10W R1495...
  • Page 45 STR-K785 Ver. 1.2 DIGITAL DISPLAY HEADPHONE MAIN 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R1573 1-216-833-11 METAL CHIP 1/10W R114 1-249-415-11 CARBON 1/4W R1574 1-216-833-11 METAL CHIP 1/10W R116 1-249-419-11 CARBON 1.5K...
  • Page 46 STR-K785 Ver. 1.2 MAIN 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C614 1-127-876-11 CERAMIC 0.01uF C422 1-126-963-11 ELECT 4.7uF C615 1-126-964-11 ELECT 10uF C423 1-126-963-11 ELECT 4.7uF C616 1-136-157-00 FILM 0.022uF...
  • Page 47 STR-K785 MAIN 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark 0 IC822 CC12 1-127-876-11 CERAMIC 0.01uF 8-759-071-47 IC TA79007S CC13 1-127-876-11 CERAMIC 0.01uF IC850 8-759-167-88 IC NJM4565D CC14 1-127-876-11 CERAMIC 0.01uF...
  • Page 48 STR-K785 Ver. 1.2 MAIN 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R407 1-247-807-31 CARBON 1/4W R567 1-249-431-11 CARBON 1/4W R416 1-247-831-91 CARBON 1/4W R568 1-247-863-91 CARBON 1/4W R451 1-247-831-91 CARBON...
  • Page 49 STR-K785 MAIN POWER STANDBY 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark R704 1-249-439-11 CARBON 1/4W 0 RR15 1-249-393-11 CARBON 1/4W F R705 1-249-421-11 CARBON 2.2K 1/4W R707 1-249-414-11 CARBON 1/4W <...
  • Page 50 STR-K785 Ver. 1.2 STANDBY TUNING VIDEO 3 7 63 1515 0 Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark C252 1-126-964-11 ELECT 10uF D923 6-500-522-11 DIODE 10EDB40-TA2B5 C253 1-126-964-11 ELECT 10uF C254 1-126-964-11 ELECT 10uF <...
  • Page 51 STR-K785 Ver. 1.2 3 7 63 1515 0 Ref. No. Part No. Description Remark Q504 6-702-391-01 IC MP1620-OPY-MK Q553 6-702-390-01 IC MN2488-OPY-MK Q554 6-702-391-01 IC MP1620-OPY-MK Q603 6-702-390-01 IC MN2488-OPY-MK Q604 6-702-391-01 IC MP1620-OPY-MK Q653 6-702-390-01 IC MN2488-OPY-MK Q654...
  • Page 52 STR-K785 3 7 63 1515 0 REVISION HISTORY Clicking the version allows you to jump to the revised page. Also, clicking the version at the top of the revised page allows you to jump to the next revised page.