STR-KM5, STR-KM7 - Sony Audio Service Manual (repair manual)

2014C80-1

© 

2014.03

•  STR-KM5 is the receiver section in HT-M5.
•  STR-KM7 is the receiver section in HT-M7.

– Continued on next page –

Photo: STR-KM7

This receiver incorporates Dolby* Digital and Pro Logic Surround and the DTS** Digital Surround System.
*  Manufactured under license from Dolby Laboratories. Dolby, Pro Logic, and the double-D symbol are trademarks of Dolby Laboratories.
**  Manufactured under license under U.S. Patent Nos: 5,956,674; 5,974,380; 6,226,616; 6,487,535 & other U.S. and worldwide patents issued & pending. 

DTS, the Symbol, & DTS and the Symbol together are registered trademarks & DTS Digital Surround | 96/24 is a trademark of DTS, Inc. Product 
includes software. © DTS, Inc. All Rights Reserved.

This receiver incorporates High-Defi nition Multimedia Interface (HDMI

TM

) technology.

HDMI, the HDMI logo, and HDMI High-Defi nition Multimedia Interface are trademarks or registered trademarks of HDMI Licensing LLC in the United 
States and other countries.
“x.v.Color (x.v.Colour)” and “x.v.Color (x.v.Colour)” logo are trademarks of Sony Corporation.
“BRAVIA” is a trademark of Sony Corporation.
“PlayStation” is a registered trademark of Sony Computer Entertainment Inc.
MPEG Layer-3 audio coding technology and patents licensed from Fraunhofer IIS and Thomson.
“WALKMAN” is a registered trademark of Sony Corporation.
MICROVAULT is a trademark of Sony Corporation.
Windows media is either a registered trademark or trademark of Microsoft Corporation in the United States and/or other countries.
This product contains technology subject to certain intellectual property rights of Microsoft. Use or distribution of this technology outside of this product is 
prohibited without the appropriate license(s) from Microsoft.

Power Output

Argentina model
Stereo mode output (rated) (6 ohms, 1 kHz, THD 1%)
 

120 W + 120 W

1)

Surround mode output

2)

 (reference) (6 ohms, 1 kHz,

THD 30%)
  

RMS 

output

FRONT: 

255 W per channel

1)

CENTER: 255 

W

1)

SURROUND:

 

255 W per channel

1)

SURROUND BACK:

 

255 W per channel

1)

Surround mode

2)

 (reference) (4 ohms, 100 Hz,

THD 30%)
SUBWOOFER: 

280 W per channel

1)

Other models
Stereo mode output (rated) (6 ohms, 1 kHz, THD 1%)
 

120 W + 120 W

1)

Surround mode output

2)

 (reference) (6 ohms, 1 kHz,

THD 10%)
  

RMS 

output

FRONT: 

216 W per channel

1)

CENTER: 216 

W

1)

SURROUND:

 

216 W per channel

1)

SURROUND BACK:

 

216 W per channel

1)

Surround mode

2)

 (reference) (4 ohms, 100 Hz,

THD 10%)
SUBWOOFER: 

250 W per channel

1)

1)

Measured under the following conditions:

 SAF, SP 

240 V AC, 50 Hz

 EA 

127 V AC, 60 Hz

  AUS, AR 

230 V AC, 50 Hz

2) 

Reference power output for front, center, surround,

  surround back speakers and subwoofers.
  Depending on the sound fi eld settings and the source,
  there may be no sound output.

AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
(US model only)
Front L + Front R:
With 6 ohm loads, both channels driven, from
50 Hz – 20,000 Hz; rated 100 watts per channel
minimum RMS power, with no more than 0.2%
total harmonic distortion from 250 milliwatts to
rated output.

US, Latin America and Argentina models
Stereo mode output (rated) (6 ohms, 1 kHz, THD 1%)
 

120 W + 120 W

3)

Surround mode output

4)

 (reference) (6 ohms, 1 kHz,

THD 30%)
  

RMS 

output

FRONT: 

255 W per channel

3)

CENTER: 255 

W

3)

SURROUND:

 

255 W per channel

3)

Surround mode

4)

 (reference) (4 ohms, 100 Hz,

THD 30%)
SUBWOOFER: 

280 W per channel

3)

Other models
Stereo mode output (rated) (6 ohms, 1 kHz, THD 1%)
 

 

120 W + 120 W

3)

Surround mode output

4)

 (reference) (6 ohms, 1 kHz,

THD 10%)
  

RMS 

output

FRONT: 

216 W per channel

3)

CENTER: 216 

W

3)

SURROUND: 

216 W per channel

3)

Surround mode

4)

 (reference) (4 ohms, 100 Hz,

THD 10%)
SUBWOOFER: 

250 W per channel

3)

0 OR  DOTTED  LINE  

0 ON  THE  SCHEMATIC  DIAGRAMS  AND  IN  

Design and specifi cations are subject to change without notice.

• Abbreviation
  E12   : 220 - 240V AC area in E model
  E51 

: Chilean and Peruvian models

 AR  : 

Argentina 

model

 AUS : 

Australian 

model

  EA 

: Saudi Arabia model

  SAF 

: South African model

  SP 

: Singapore model

 TH  : 

Thai 

model

Analog 

Sensitivity: 800 mV/
50 kilohms

Digital (Coaxial) 

Impedance: 75 ohms

AUDIO OUT 

Voltage: 800 mV/

1 kilohm

Gain levels 

±6 dB, 1 dB step

28 Hz – 20,000 Hz

Tuning range 

87.5 MHz – 108.0 MHz

Antenna (aerial) 

FM wire antenna (aerial)

Antenna (aerial) terminals

75 ohms, unbalanced

Tuning range

Antenna (aerial) 

Loop antenna (aerial)

(HT-M7/HT-M5)
Inputs/Outputs
Video: 

1 Vp-p, 75 ohms

COMPONENT VIDEO:

Y: 1 Vp-p, 75 ohms
P

B

: 0.7 Vp-p, 75 ohms

P

R

: 0.7 Vp-p, 75 ohms

80 MHz HD Pass Through

(except SAF, AR)
Supported bit rate* 

MP3 (MPEG 1 Audio 
Layer-3):
32 kbps – 320 kbps, VBR
WMA: 48 kbps – 192 kbps
AAC: 48 kbps – 320 kbps

10 kHz step

9 kHz step

USA, E51, AR 

530 kHz – 
1,710 kHz

531 kHz – 
1,710 kHz

EA, SAF, AUS, 
TH, E12, SP 

–

531 kHz – 
1,602 kHz

Supported USB device

Mass Storage Class

Maximum current 

500 mA

following conditions:

240 V AC, 50 Hz

3)

Measured under the 

4)

Reference power output for front, center, surround 
speakers and subwoofers. Depending on the sound 
field settings and the source, there may be no 
sound output.

USA

120 V AC, 60 Hz

SAF, E51, E12

EA

AR, TH

127 V AC, 60 Hz

230 V AC, 50 Hz

Sampling frequencies*

MP3 (MPEG 1 Audio 
Layer-3): 32 kHz/
44.1 kHz/48 kHz
WMA: 44.1 kHz
AAC: 44.1 kHz

* Compatibility with all encoding/writing 

software, recording devices and recording 
media cannot be guaranteed.

Transfer speed

Full-speed

Power requirements

Power consumption (during standby mode)

0.3 W (When 
“CTRL.HDMI” is set to 
“CTRL OFF”)

Dimensions (width/height/depth) (Approx.)

   

430 mm × 178 mm × 
336 mm

(17 in × 7 

1

/

8

 in ×

13 

1

/

4

 in)

SAF, TH, SP

230 V AC – 240 V AC, 
50/60 Hz

E51  

120 /220/240 

V 

AC, 

50/60 Hz

AR 

 220 V AC – 230 V AC, 

50/60 Hz

EA 

 120 V AC – 127/220/230 V 

AC – 240 V AC, 50/60 Hz

AUS 

  230 V AC, 50 Hz

E12 

 220 V AC – 240 V AC, 

50/60 Hz

Power consumption  185 W (STR-KM7)

175 W (STR-KM5)

including projecting parts 

and controls

Mass (Approx.) 

(STR-KM7/STR-KM5)

10.2 kg (22 lb 8 oz) 

USA

120 V AC, 60 Hz

 ................................................. 4

2-1.   Disassembly Flow .............................................................. 6
2-2.   Case .................................................................................... 6
2-3.   Front Panel Block .............................................................. 7
2-4.   Back Panel Block ............................................................... 7
2-5.   Main Block, SUB RECTIFIER Board ............................... 8
2-6.   Heatsink Block, MAIN Board,

SURR BACK AMP Board ................................................. 9

 .............................................................. 10

 ........................................... 12

5-1.  Block Diagram - TUNER/AUDIO Section - ................... 13
5-2.  Block Diagram - DIGITAL Section -............................... 14
5-3.  Block Diagram - VIDEO Section - .................................. 15
5-4.  Block Diagram - HDMI Section - .................................... 16
5-5.  Block Diagram - KEY/DISPLAY/USB Section -............ 17
5-6.  Block Diagram - POWER KEY Section - ....................... 18
5-7. Printed 

Wiring 

Board 

- DIGITAL AUDIO Board (Side A) - .............................. 20

5-8. Printed 

Wiring 

Board 

- DIGITAL AUDIO Board (Side B) - .............................. 21

5-9. Schematic 

Diagram 

- DIGITAL AUDIO Board (1/4) - .................................... 22

5-10. Schematic Diagram 

- DIGITAL AUDIO Board (2/4) - .................................... 23

5-11. Schematic Diagram 

- DIGITAL AUDIO Board (3/4) - .................................... 24

5-12. Schematic Diagram 

- DIGITAL AUDIO Board (4/4) - .................................... 25

5-13.  Printed Wiring Board - MAIN Board - ............................ 26
5-14.  Schematic Diagram - MAIN Board (1/4) - ...................... 27
5-15.  Schematic Diagram - MAIN Board (2/4) - ...................... 28
5-16.  Schematic Diagram - MAIN Board (3/4) -. ..................... 29
5-17.  Schematic Diagram - MAIN Board (4/4) - ...................... 30
5-18. Printed Wiring Board 

- HDMI RE PC Board (Side A) - ..................................... 31

5-19. Printed Wiring Board 

- HDMI RE PC Board (Side B) - ..................................... 32

5-20.  Schematic Diagram - HDMI RE PC Board (1/2) - .......... 33
5-21.  Schematic Diagram - HDMI RE PC Board (2/2) - .......... 34

5-22.  Printed Wiring Board - POWER AVIDEO Board - ......... 35
5-23.  Schematic Diagram - POWER AVIDEO Board - ............ 36
5-24. Printed Wiring Board 

- DISPLAY Board (Suffi x-12) - ....................................... 37

5-25. Printed Wiring Board 

- DISPLAY Board (Suffi x-21) - ....................................... 37

5-26. Schematic Diagram 

- DISPLAY Board (Suffi x-12/-21) - ................................ 38

5-27.  Printed Wiring Board - DCDC Board - ........................... 39
5-28.  Schematic Diagram - DCDC Board - .............................. 40
5-29.  Printed Wiring Board - LED BAR Board - ...................... 41
5-30.  Schematic Diagram - LED BAR Board - ........................ 41
5-31. Printed Wiring Board 

- USB Board (EXCEPT SAF, AR) - ................................ 42

5-32. Schematic Diagram 

- USB Board (EXCEPT SAF, AR) - ................................ 43

5-33. Printed Wiring Board 

- SURR BACK AMP Board (KM7) - .............................. 44

5-34. Schematic Diagram 

- SURR BACK AMP Board (KM7) - .............................. 45

5-35.  Printed Wiring Board - TUNER1 Board - ....................... 46
5-36.  Schematic Diagram - TUNER1 Board - .......................... 46
5-37.  Printed Wiring Board - SUB RECTIFIER Board - .......... 47
5-38.  Schematic Diagram - SUB RECTIFIER Board - ............ 47
5-39.  Printed Wiring Board - POWER KEY Board -................ 48
5-40.  Schematic Diagram - POWER KEY Board - .................. 48
5-41.  Printed Wiring Board - THERMAL Board - ................... 48
5-42.  Schematic Diagram - THERMAL Board - ...................... 48

6-1. Case 

Section 

..................................................................... 58

6-2.  Front Panel Section .......................................................... 59
6-3.  Back Panel Section .......................................................... 60
6-4. Chassis 

Section 

................................................................ 61

6-5. Heatsink 

Section 

.............................................................. 62

 ................................ 63

NOTE  OF  REPLACING  THE  IC2036  AND  IC2811  ON  
THE  DIGITAL  AUDIO  BOARD
IC2036 and IC2811 on the DIGITAL AUDIO board cannot 
exchange with single. When these parts on the DIGITAL AUDIO 
board are damaged, exchange the entire mounted board.

NOTE  OF  REPLACING  THE  IC3500  AND  IC3501  ON  
THE  HDMI  RE  PC  BOARD
IC3500 and IC3501 on the HDMI RE PC board cannot exchange 
with single. When these parts on the HDMI RE PC board are 
damaged, exchange the entire mounted board.

UNLEADED  SOLDER
Boards 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 with 

the lead free mark due to their particular size)

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 viscou-s (sticky, less prone to fl ow) 
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.

Special Component Notice
The components identified by mark 

9 contain confidential

information.
Strictly follow the instructions whenever the components are
repaired and/or replaced.

Notes on chip component replacement
• 

Never reuse a disconnected chip component.

• 

Notice that the minus side of a tantalum capacitor may be dam-
aged by heat.

Note: Refer to SUPPLEMENT-1 for adding SERVICING NOTES 

(TROUBLESHOOTING)

KM7: SAF

4-299-205-0[]

KM7: EA

4-299-205-1[]

KM7: AUS

4-299-205-2[]

KM7: SP

4-299-205-4[]

KM7: AR

4-299-205-5[]

KM5: SAF

4-409-904-0[]

KM5: TH

4-409-904-1[]

KM5: EA

4-409-904-2[]

KM5: E12

4-409-904-3[]

KM5: E51

4-409-904-4[]

KM5: AR

4-409-904-5[]

KM5: US

4-409-904-6[]

DISPLAY BOARD DISCRIMINATION
In this set, the DISPLAY board has two suffi x  number. 
The Suffi x-12 is for KM5: E12, SAF, EA, TH, E51, AR / KM7 
models. While Suffi x-21 is for KM5: US model.
Repair after distinguishing each DISPLAY board suffi x number to 
doing the repair referring to the following.

• Abbreviation
  E12 

: 220 - 240V AC area in E model

  E51 

: Chilean and Peruvian models

 AR  : 

Argentina 

model

 AUS : 

Australian 

model

  EA 

: Saudi Arabia model

  SAF 

: South African model

  SP 

: Singapore model

 TH  : 

Thai 

model