Sony STR-K790 User Manual

SERVICE MANUAL
Sony Corporation
Home Audio Division
Published by Sony Techno Create Corporation
US Model
Canadian Model
AEP Model
UK Model
FM STEREO/FM-AM RECEIVER
9-887-542-02
2007C16-1
© 2007.03
Ver. 1.1 2007.03
SPECIFICATIONS
STR-K790
• STR-K790 is the tuner and the amplifier section
in HT-DDW790 and HT-DDW795.
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 —
AUDIO POWER
SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
(Models of area code US only)
With 6 ohm loads, both channels driven, from
120 – 20,000 Hz; rated 85 watts per channel
minimum RMS power, with no more than 1%
total harmonic distortion from 250 milliwatts
to rated output.
Amplifier section
Power Output
1)
Stereo mode (rated) (6 ohms 1 kHz, THD 1%)
85 W + 85 W
Surround mode
2)
(reference)
(6 ohms 1 kHz, THD 10%)
RMS output
FRONT:133 W
per channel
CENTER: 133 W
SURROUND: 133 W
per channel
Surround mode
2)
(reference)
(6 ohms 100 Hz, THD 10%)
SUB WOOFER: 135 W
1)
Measured under the following conditions:
Area code Power requirements
US, Canadian 120 V AC, 60 Hz
AEP, UK 230 V AC, 50 Hz
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.
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
AM tuner section
Tuning range
Models of area code US, Canadian
With 10-kHz tuning scale:
530 – 1,710 kHz
4)
With 9-kHz tuning scale:
531 – 1,710 kHz
4)
Models of area code AEP, UK
With 9-kHz tuning scale:
531 – 1,602 kHz
Antenna Loop antenna
Intermediate frequency
450 kHz
4)
You can change the AM tuning scale to 9 kHz or
10 kHz. After tuning in any AM station, turn off
the receiver. While holding down DIMMER, press
?/1. All preset stations will be erased when you
change the tuning scale. To reset the scale to 10
kHz (or 9 kHz), repeat the procedure.
General
Power requirements
Area code Power requirements
US, Canadian 120 V AC, 60 Hz
AEP, UK 230 V AC, 50/60 Hz

Sony STR-K790 Specifications

General

Brand	Sony
Model	STR-K790
Category	Receiver
Language	English

Summary

Specifications

Audio Power Specifications

Detailed output power and harmonic distortion specs.

AM Tuner Section

Tuning range and power requirements for AM reception.

General Specifications

Power requirements based on area code.

Safety and Handling

Safety Check-Out Procedures

Steps for ensuring safety after service.

Leakage Test Method

Procedure for measuring AC leakage current.

Safety Component Warning

Warning regarding critical safety components.

Model and Component Identification

Rear Panel Identification

Location of area code and part number on the rear panel.

Section 1 General Information

Front Panel Controls and Indicators

Description and function of front panel controls.

Display Indicators Explained

Explanation of receiver display indicators.

Remote Commander Operation

Battery Installation

Instructions for inserting batteries into the remote.

Remote Functions Overview

Overview of remote functions and assigned components.

Section 2 Test Modes

Sound Field Clear Mode

Clears preset sound fields for service.

Software Version Display

Shows software version, model name, and destination.

Key Check Mode

Tests the functionality of each button.

Fluorescent Indicator Tube Test

Tests all segments of the fluorescent display.

Swap All Mode

Swaps signals to all channels for sound output.

Shipment Mode

Resets all preset contents to default settings.

Protector Auto Off Mode

Turns off the amplifier's protection feature.

AM Channel Step Selection

Selects the AM channel step increment.

VACS Control Test Mode

Turns off the VACS feature of the amplifier.

DCAC Factory Test Mode

Test Mode Stages

Outlines the two stages of DCAC factory testing.

Test System Setup

Diagram showing the setup for factory testing.

DSP Data Line Checking

Checks data line integrity within the DCAC DSP.

DCAC Board Checking

Checks DCAC board functionality with test tones.

Section 3 Electrical Adjustment

Tuner Section Adjustment

Procedures for tuning adjustments.

FM Auto Stop Check

Procedure to check FM auto stop function.

Section 4 Diagrams

General Diagram Information

Notes, board locations, and waveforms.

Digital Board Diagrams

Printed wiring and schematic diagrams for the Digital Board.

HDMI Board Diagrams

Printed wiring and schematic diagrams for HDMI boards.

Main and Standby Board Diagrams

Printed wiring and schematic diagrams for Main and Standby boards.

Display Board Diagrams

Printed wiring and schematic diagrams for the Display Board.

Power, DCAC, Headphone Board Diagrams

Printed wiring and schematic diagrams for Power, DCAC, and Headphone boards.

IC Block Diagrams

Block diagrams and pin functions for key ICs.

Section 5 Exploded Views

Front Panel Section Exploded View

Exploded view of the front panel assembly.

Chassis Section Exploded View

Exploded view of the chassis assembly.

Section 6 Electrical Parts List

DCAC Board Parts

List of electrical parts for the DCAC board.

Component Lists (Capacitors, Diodes, Jacks, Transistors, Resistors)

Lists common electronic components with specifications.

Specialized Component Lists (Connectors, ICs, Network Resistors)

Lists connectors, ICs, and network resistors with specifications.

Revision History