Sony str ks 370 ver 1 0 2010 01

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STR-KS370

SERVICE MANUAL

Ver. 1.0 2010.01

US Model

This receiver incorporates Dolby* Digital and Pro

Logic Surround and the DTSM 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
#s: 5,451,942; 5,956,674; 5,974,380;
5,978,762; 6,487,535 & other U.S. and
worldwide patents issued & pending. DTS and
DTS Digital Surround are registered trademarks
and the DTS logos and Symbol are trademarks of
DTS, Inc. © 1996-2008 DTS, Inc. All Rights
Reserved.

This receiver incorporates High»Definition
Multimedia Interface (HDMJTM) technology.
HDMI, the HDMI logo and High-Definition
Multimedia Interface are trademarks or registered
trademarks of HDMI Licensing LLC in the
United States and other countries.

x.v.Color" and x.v.Color
Sony Corporation.

BRAVIA is a trademark of Sony Corporation.

PlayStation is a registered trademark of Sony
Computer Entertainment Inc.

S-AIR" and its logo are trademarks of Sony

About area codes

The area code of the receiver you purchased is
shown on the upper left portion of the rear panel
(see the illustration below).

4-XXX-XXX-XX(X) AA

Area code

Any differences in operation. according to the area
code, are clearly indicated in the text, for example.

Models of area code AA only".

9-890-531-01 Sony Corporation
2010A08-1 Audio & Video Business Group
© 2010.01

Published by Sony EMCS (Malaysia) PG Tec

SPECIFICATIONS

AUDIO POWER
SPECIFICATIONS

Amplifier section

POWER OUTPUT AND TOTAL HARMONIC

DISTORTION:

(FTC)

(Models of area code us only)

FRONT L + FRONT R
With 3 ohm loads, both
channels driven, from 180
, 20,000 Hz; rated 84 watts
per channel minimum
RMS power. with no more
than 1% total harmonic
distortion from 250
milliwatts to rated output.

POWER OUTPUT (reference)

FRONT L/FRONT R/CENTER/SUR L/SUR R
167 w (per channel at
3 ohms, 1 kHz)

SUBWOOFER l65 W (at 3 ohms, 60 Hz)

Inputs
Analog Sensitivity: 1 Wm kohms
Digital (Coaxial) Impedance: 75 ohms

FM tuner section

Tuning range 875 , 108.0 MHz
(100 kHz step)
Antenna FM wire antenna

Antenna tenninats 75 ohms, unbalanced
Intermediate frequency
10.7 MHz

AM tuner section
Tuning range

Area code Tunlng scale

10 kHz step 9 kHz step

US 530- 531-
1.710kHz 1.710kHz

Antenna AM loop antenna
Inten-nediate frequency
450 kHz

General

Power requirements

Area code Power requlrements
US 120 V AC, 60 Hz

Power output (DIGITAL MEDIA PORT)
DC OUT 5 V, 0.7A MAX

Power consumption

Area code Fewer consum
US l 10 W

Power consumption (during standby mode)
0.3 W (When Control for
HDMI and S-AlR standby
are set to off)

Dimensions (w/li/d) (Approx.)
l7in>< 2 5/8 in X 12 l/Sin
(430 mm x 66.5 mm X
306 mm)
including projecting parts
and controls

Mass (Approx) 7 lb 8 oz (3.4 kg)

Design and specifications are subject to
Change Without notice.

Halogenared flame retardants are not used in
the certain printed wiring boards.

AV RECEIVER

SONY.

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STR-KS370

NOTES ON CHIP COMPONENT REPLACEMENT

- Never reuse a disconnected chip component.

- Notice that the minus side ofa tantalum capacitor may be dam»
aged by heat.

SAFETY CHECK-OUT

Afier correcting the original service problem, perform the follow»
ing safety check 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 TEST

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 ofthree methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA
WT-54OA. Follow the manufacturers instructions to use these
instruments.

2. A battery-operated AC milliammeter. The Data Precision 245
digital multimeter is suitable for thisjob.

3. Measuring the voltage drop across a resistor by means of a
VOM or battery-operated AC voltmeter. The limit indication
is 0.75 V, so analog meters must have an accurate low-voltage
scale. The Simpson 250 and Sanwa SH-63Trd are examples
of a passive VOM that is suitable. Nearly all battery operated
digital multimeters that have a 2 V AC range are suitable. (See
Fig. A)

To Exposed Metal
Parts on Set

A C
/ voltmeter
(0.75 V)

0.15 [.IF

g 1.5 kg

_T_ Earth Ground
Fig. A. Using an AC voltmeter to check AC leakage.

SAFETY-RELATED COMPONENT WARNING!

COMPONENTS IDENTIFIED BY MARK A OR DOTTED LINE
WITH MARK A 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.

5-1.
5-2.
5-3.
5-4.
5-5.
5-6.

5-8.
5-9.

5-10.
5-11.
5-12.
5-13.
5-14.
5-15.
5-16.
5-17.
5-18.
5-19.

5-20.

5-21.
5-22.

TABLE OF CONTENTS

SERVICING NOTES 3
DISASSEMBLY. 4
Dis mbly Flow 4
Case. 4
S-AIR Board ..................... 5
Tuner (FM/AM), 10 Board . 5
Front Panel Block 6
MAIN Board 6
TEST MODE ............................................................. 7
ELECTRICAL CHECK .......................................... 9
DIAGRAMS ..................... 10
Block Diagram - MAIN Section -.. 11
Block Diagram - HDMI PC Section - 12
Block Diagram - DSP/S-AIR Section - 13

Block Diagram- AMP Section
Block Diagram - SMPS Section -

Printed Wiring Board

- MAIN Board (Component Side) - ................................ 17
Printed Wiring Board

- MAIN Board (Conductor Side) - ........ 18
Schematic Diagram - MAIN Board (1/5) 1)
Schematic Diagram - MAIN Board (2/5) 20
Schematic Diagram - MAIN Board (3/5) -.. 21
Schematic Diagram - MAIN Board (4/5) -.. 22
Schematic Diagram - MAIN Board (5/5) -.. 23
Printed Wiring Board- S-AIR and 10 Board - 24
Schematic Diagram - S-AIR Board 24
Schematic Diagram - 10 Board - 25
Printed Wiring Board - HDMI PC Board 26
Schematic Diagram - HDMI PC Board (1/2) - 27
Schematic Diagram - HDMI PC Board (2/2) - ............... 28
Printed Wiring Board - DISPLAY, IR, LED,

KEY FUNCTION and KEY POWER Board - .............. 2)
Schematic Diagram - DISPLAY, IR, LED,

KEY FUNCTION and KEY POWER Board - 30
Printed Wiring Board- SMPS Board - 31
Schematic Diagram - SMPS Board -. 32
EXPLODED VIEWS ............................................... 43
Case, S-AIR Board Section . 43
Front Panel Section ........... 44
Chassis Section ............................................................... 45
ELECTRICAL PARTS LIST ............................... 46