Onkyo A-809 Service Manual

A-809
Ref. No. 3404
ONKYO.:
SERVICE
MANUAL
Integrated
Stereo
Amplifier
MODEL
A-809
GIYVO intesta sciccair wens ner MH
Black
and
silver
models
120V
AC,
60Hz
230V
AC,
50Hz
240V AC, 50Hz
120V/220V
AC,
50Hz/60Hz
SAFETY-RELATED
COMPONENT
WARNING!!
COMPONENTS
IDENTIFIED
BY
MARK
A
ON
THE
SCHEMATIC
DIAGRAM
AND
IN
THE
PARTS
LIST
ARECRITI-
CAL
FOR
RISK
OF
FIRE
AND
ELECTRIC
SHOCK.
REPLACE
THESE
COMPONENTS
WITH
ONKYO
PARTS
WHOSE
PARTS
NUMBERS
APPEAR
AS
SHOWN
IN
THIS
MANUAL.
MAKE
LEAKAGE-CURRENT
OR
RESISTANCE
MEASURE-
MENTS
TO
DETERMINE
THAT
EXPOSED
PARTS
ARE
AC-
CEPTABLY
INSULATED
FROM
THE
SUPPLY
CIRCUIT
BLFORE
RETURNING
THE
APPLIANCE
TO
THE
CUS-
TOMER.
ONKYO
AUDIO
COMPONENTS

Onkyo A-809 Specifications

General

Brand	Onkyo
Model	A-809
Category	Amplifier
Language	English

Summary

Service Manual Introduction and Safety

Safety-Related Component Warning

Critical components for fire/shock risk require replacement with specified parts.

Specifications and Precautions

Technical Specifications

Detailed performance metrics including power output, distortion, sensitivity, and frequency response.

Precautions for Use and Maintenance

Guidelines on fuse replacement, insulation resistance measurement, and voltage selector usage.

Adjustment Procedures

Preparation and Setup for Adjustments

Instructions for workbench setup, including load, signal, and switch configurations.

Idling Current Adjustment

Procedure for adjusting idling current using test points and semi-fixed resistors.

Protection Circuitry Operation Check

Steps to verify the operation of the protection relay and DC detection circuitry.

Microprocessor IC Block Diagram

Microprocessor Pin Function Descriptions

Detailed explanation of each pin's function for the TMP47C440AN microprocessor.

Microprocessor and Motor Drive IC Details

Microprocessor Pin Functions (Continued)

Further pin descriptions for the microprocessor, including input/output selectors and mode controls.

System Block Diagram

Amplifier System Overview

Detailed Block Diagram Components

Printed Circuit Board Parts Lists

Printed Circuit Board Components (Continued)

Printed Circuit Board Components (Further)

Schematic Diagrams

AC 120V Type Schematic

The main schematic diagram for the AC 120V model of the amplifier.

Schematic Diagram Sections

AC 809 Model Schematic Details

Schematic Diagram Continuation

Power Supply and Component Schematics