Sony STR-K685 - Service Manual

SERVICE MANUAL
Sony Corporation
Home Audio Division
Published by Sony Techno Create Corporation
E Model
FM STEREO/FM-AM RECEIVER
9-887-654-03
2007G16-1
© 2007.07
Ver. 1.2 2007.07
SPECIFICATIONS
STR-K685
• STR-K685 is the tuner and the amplifier
section in HT-DDW685.
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.
** “DTS” and “DTS Digital Surround” are registered trademarks of DTS,
Inc.
— Continued on next page —
Amplifier section
Models of area code SP, SP6, E51, MX, TH
Power Output
1)
Stereo mode (rated) (6 ohms 1 kHz, THD 1%)
70 W + 70 W
Surround mode
2)
(reference)
(6 ohms 1 kHz, THD 10%)
RMS output
FRONT:100 W
per channel
CENTER: 100 W
SURROUND: 100 W
per channel
Surround mode
2)
(reference)
(10 ohms 100 Hz, THD 10%)
SUB WOOFER: 60 W
per channel
Models of area code AR
Power Output
1)3)
Stereo mode (rated) (6 ohms 1 kHz, THD 1%)
70 W + 70 W
1)
65 W + 65 W
3)
Surround mode
2)
(reference)
(6 ohms 1 kHz, THD 10%)
RMS output
FRONT:
100 W per channel
1)
90 W per channel
3)
CENTER:
100 W
1)
90 W
3)
SURROUND:
100 W per channel
1)
90 W per channel
3)
Surround mode
2)
(reference)
(10 ohms 100 Hz, THD 10%)
SUB WOOFER:
60 W per channel
1)
50 W per channel
3)
1)
Measured under the following conditions:
Area code Power requirements
SP, SP6, AR, TH 230 V AC, 50 Hz
E51 240 V AC, 50 Hz
MX
2)
Reference power output for front, center, surround
speakers and sub woofer. Depending on the sound
field settings and the source, there may be no
sound output.
3)
Measured under the following conditions:
Inputs
Analog Sensitivity: 800 mV/
50 kohms
Digital (Coaxial) Impedance: 75 ohms
Tone
Gain levels ±6 dB, 1 dB step
Reproduction frequency range:
28 – 20,000 Hz
FM tuner section
Tuning range 87.5 - 108.0 MHz
Antenna FM wire antenna
Antenna terminals 75 ohms, unbalanced
Intermediate frequency
10.7 MHz
Area code Power requirements
AR 220 V AC, 50 Hz
127 V AC, 60 Hz

Summary

SPECIFICATIONS

Amplifier section

Details power output for stereo and surround modes, THD, and impedance ratings.

FM tuner section

Specifies tuning range, antenna terminals, and intermediate frequency for FM reception.

GENERAL INFORMATION

Front Panel Overview

Rear Panel Connections

Remote Commander Functions

DCAC FACTORY TEST MODE

DCAC DSP Data Line Checking

Verifies the integrity of the DCAC DSP data line for proper operation.

DCAC Board Checking

Tests the functionality of the DCAC board using test tones and microphone input.

ELECTRICAL ADJUSTMENT

Tuner Section Adjustment

DIAGRAMS & SCHEMATICS

Block Diagrams

Printed Wiring Boards (PWBs)

Schematic Diagrams

Presents detailed circuit schematics for digital, main, display, power, DCAC, and headphone boards.

IC Block Diagrams

Details pin functions and block diagrams for key integrated circuits used in the unit.

Sony STR-K685 Specifications

General

Channels	5.1
Surround Sound	Dolby Digital, DTS
Weight	8.5 kg
Power output	100 watts per channel into 8 ohms (stereo)
Total harmonic distortion	0.7%
Signal to noise ratio	80dB
Speaker load impedance	8 ohms
Digital inputs	1 optical, 1 coaxial
Video Connections	Composite video
Inputs	2 audio
Outputs	1 audio, 1 subwoofer
Dimensions	430 x 298 mm
Tuning range	FM/AM