Sony TA-A790N User Manual

SERVICE
MANUAL
conser weneure comessia sores LBT-AZ95
This set is the Power Amplifier
section in LBT-A790/A795.
SPECIFICATIONS
Peak music power output (6 ohms, 4 speakers driven)
900W (MX)
1,200W (EF, EA, SP, MY, JE, AUS)
Continuous RMS power output
FRONT (AEP, IT, G, CIS) 100 W + 100 W (6 ohms, DIN, 1 kHz)
120 W +120 W
(6 ohms, at 1 kHz, 5% THD)
FRONT (E, EA, SP, 125W +125W
MY, MX, JE, AUS) (6 ohms, at 1kHz, 5% THD)
REAR 20 W + 20 W (4 ohms, DIN, 1 kHz)
25W +25W
(4 ohms, at 1 kHz, 5% THD)
Music power output (AEP, IT, G, CIS)
FRONT 180 W + 180 W
(6 ohms, at 1 kHz, 10% THD)
REAR 33 W +33 W
(4 ohms, at 1 kHz, 10% THD)
Frequency response
0
FRONT 15 Hz to 50 kHz -3 dB
REAR 15 Hz to 50 kHz “3 dB
Power requirements 220—230V AC, 50/60Hz
(AEP, IT, CIS, G)
240V AC, 50/60Hz (AUS)
120V/220V /230—240V AC, 50/60Hz
(EA, E, JE, MY, SP)
120V AC, 60Hz (MX)
Power consumption 240W (AEP, IT, CIS, G)
285W (AUS, EA, E, JE, MY, SP)
270W (MX)
Mass
TA-ATSON
AEP Model
E Model
Australian Model
Tourist Model
Approx. 7.5 kg (16 lbs 8 oz)
(AEP, IT, G, CIS, MX)
Approx. 7.6 kg (16 lbs 12 oz)
(E, EA, SP, MY, AUS, JE)
Dimensions Approx. 355 x 135 x 325 mm
(14x 55/,,.x 12 3/,, inches)
(w/h/d, including projections)
Design and specifications are subject to change without notice.
e Abbreviations
IT
G
AUS:
EA
JE
MY
SP
MX
: Italian model
: German model
Australian model
: Saudi Arabia model
: Tourist model
: Malaysia model
: Singapore model
: Mexican model
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.
STEREO
POWER
AMPLIFIER
SONY.

Sony TA-A790N Specifications

General

Brand	Sony
Model	TA-A790N
Category	Amplifier
Language	English

Summary

General Information and Safety

Model Overview and Specifications

Details model variants, power output, mass, and dimensions of the amplifier.

Safety Component Criticality

Highlights critical safety components requiring specific replacement parts.

General Information and Unit Identification

Model Identification and Service Notes

Provides model-specific voltage/power details and a note for service jig connection.

Front Panel Parts Identification

Identifies key components on the front panel using reference numbers.

Service Notes and Procedures

Removing Front Panel Joint

Step-by-step instructions for disassembling and removing the front panel joint.

Circuit Diagrams Overview

Circuit Board Locations

Illustrates the placement of various circuit boards within the unit.

Semiconductor Lead Configurations

Provides pinout diagrams for various transistors, diodes, and ICs used in the unit.

System Functional Block Diagram

Illustrates the functional blocks and signal paths within the TA-A790N amplifier.

Integrated Circuit Block Diagrams

Detailed block diagrams for specific integrated circuits (µPC1237HA, IR2E31A).

Printed Wiring Board Layouts

Semiconductor Location Mapping

Maps specific semiconductor part numbers to their locations on the printed circuit boards.

Printed Wiring Board Diagrams

Visual representations of the printed wiring boards for major sections of the unit.

Detailed Circuit Schematics

Schematic Diagram Notes

Explains component notations, abbreviations, and important safety notes for the schematic.

Exploded Views and Part Identification

Front Panel Assembly

Lists parts and their reference numbers for the front panel assembly.

Chassis and Board Assemblies

Chassis Components

Lists chassis components, boards, cords, and hardware with reference numbers.

Electrical Parts List - Core Sections

Headphone Section Parts

Detailed list of capacitors and jacks for the headphone section.

Main Section Components

Comprehensive list of capacitors for the main section of the unit.

Electrical Parts List - Main Unit

Main Unit Circuit Components

Lists capacitors, transistors, diodes, ICs, and resistors for the main circuitry.

Electrical Parts List - Ancillary Sections

Panel, Power, Relay Components

Lists components for panel, power switch, and relay sections, including resistors and capacitors.

Electrical Parts List - Control and Indicator Components

LEDs, ICs, and Switches

Lists LEDs, ICs, transistors, and resistors for panel, power switch, and relay sections.

Electrical Parts List - Connectivity and Secondary Boards

Other Board Components

Lists components for relay, sensor, system connector, and transformer secondary boards, plus diodes.

Electrical Parts List - Power and Selection Systems

Power and Voltage Selection Components

Lists fuses, transistors, resistors, connectors, switches, and transformers for secondary and voltage selection boards.