Manual sony k685

STR-K685
SERVICE MANUAL
Ver. 1.2 2007.07

E Model

• 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 DigitalSurround” are registered trademarks of DTS, Inc.

SPECIFICATIONS
Surround mode2) (reference) (6 ohms 1 kHz, THD 10%) Models of area code SP, SP6, E51, MX, TH RMS output Power Output1) FRONT: Stereo mode (rated) (6 ohms 1 kHz, THD 1%) 100 W per channel1) 70 W + 70 W 90 W per channel3) Surround mode2) (reference) CENTER: (6 ohms 1 kHz, THD 10%) 100 W1) RMS output 90 W3) FRONT:100 W SURROUND: per channel100 W per channel1) CENTER: 100 W 90 W per channel3) SURROUND: 100 W Surround mode2) (reference) per channel (10 ohms 100 Hz, THD 10%) Surround mode2) (reference) SUB WOOFER: (10 ohms 100 Hz, THD 10%) 60 W per channel1) SUB WOOFER: 60 W 50 W per channel3) per channel

Amplifier section

2)

Reference power output for front, center, surround speakers and sub woofer. Depending on the sound fieldsettings and the source, there may be no sound output. 3) Measured under the following conditions: Area code AR Power requirements 220 V AC, 50 Hz

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 Antennaterminals 75 ohms, unbalanced Intermediate frequency 10.7 MHz

1)

Models of area code AR Power Output1)3) Stereo mode (rated) (6 ohms 1 kHz, THD 1%) 70 W + 70 W1) 65 W + 65 W3)

Measured under the following conditions: Power requirements 230 V AC, 50 Hz 240 V AC, 50 Hz 127 V AC, 60 Hz

Area code SP, SP6, AR, TH E51 MX

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FM STEREO/FM-AM RECEIVER
9-887-654-032007G16-1 © 2007.07

Sony Corporation
Home Audio Division Published by Sony Techno Create Corporation

STR-K685
Ver. 1.2

AM tuner section
Tuning range Models of area code SP, SP6, TH With 9-kHz tuning scale: 531 – 1,602 kHz Models of area code E51: With 10-kHz tuning scale: 530 – 1,610 kHz4) With 9-kHz tuning scale: 531 – 1,602 kHz4) Models of area code AR, MX With 10-kHz tuning scale:530 – 1,610 kHz Antenna Loop antenna Intermediate frequency 450 kHz
4)

Notes on chip component replacement • Never reuse a disconnected chip component. • Notice that the minus side of a tantalum capacitor may be damaged by heat. UNLEADED SOLDER Boards requiring use of unleaded solder are printed with the leadfree mark (LF) indicating the solder contains no lead. (Caution: Some printed circuitboards may not come printed with the lead free mark due to their particular size) : LEAD FREE MARK 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 regulatorshould 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 flow) 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 unleadedsolder may also be added to ordinary solder.
SAFETY-RELATED COMPONENT WARNING!! 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.

You can change the AM tuning scale to 9 kHz...