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Onkyo TX-8020B User Manual

Onkyo TX-8020B
23 pages
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TX-8020
RC-875S
Features
50 Watts/Channel @ 8 Ω (FTC) (For North American Model)
90 Watts/Channel @ 6 Ω (IEC) (For European Model)
WRAT (Wide Range Amplifier Technology)
Discrete Amplifier Output Stage Circuitry
Massive EI Transformer
High-Current, Low-Impedance Drive
Direct Mode
5 Analog Audio Inputs and 1 Output
3 Digital Audio Inputs (1 Optical, 2 Coaxial) (European Model only)
Phono Input for Turntable Connection
Independent Bass, Treble, and Balance Controls
Subwoofer Pre-Out
Speaker A/B Terminals
Remote Interactive (RI) Input for Integrated Control of Compatible
Onkyo Components
Headphone Jack
40 FM/AM Random Presets
Preset Station Naming (Up to 8 Characters)
RDS (PS/PTY/RT) (European Model only)
3-Mode Display Dimmer (Normal/Dim/Dimmer)
Sleep Timer (via Remote)
Battery-Free Memory Back-up
Full-Sized, Full-Function RI Remote Control
STEREO RECEIVER
Black and Silver models
MODEL TX-8020(B)/(S)
Ref. No. 4449
082013
120V AC, 60Hz
230V AC, 50Hz
B MDC
B MPP, S MPP
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Onkyo TX-8020B Specifications

General IconGeneral
Receiver typestereo
Audio output channels- channels
Signal-to-Noise Ratio (SNR)100 dB
Total Harmonic Distortion (THD)1 %
Power output per channel (20-20KHz@8 Ohm)90 W
Connectivity technologyWired
Speakers connectivity type-
Product colorBlack
Apple docking compatibilityNot supported
AC input frequency50 Hz
Power consumption (typical)170 W
Package weight9600 g
HDMI in0
Audio (L/R) in5
Digital audio coaxial in2
Digital audio optical in1
Multichannel audio input typeTerminals
Ethernet LANNo
RDS featuresPS, PTY, RT, TP
Supported radio bandsAM, FM
Preset stations quantity40
Weight and Dimensions IconWeight and Dimensions
Depth150 mm
Width435 mm
Height328.5 mm
Weight7300 g

Summary

Product Features

Power and Amplifier Specifications

Details power output per channel and amplifier technologies used.

Input and Connectivity Options

Lists available analog, digital, and phono inputs, plus speaker terminals.

Control and Operational Features

Covers bass, treble, balance controls, remote operation, and sleep timer.

Service Procedures

General Precautions

Essential safety measures for servicing the unit, including grounding and tool selection.

Fuse Replacement Guide

Instructions for replacing fast and slow-acting fuses, emphasizing correct type.

Unit Initialization and Firmware Check

Procedures for initial unit setup and firmware version verification.

Operation Checks - Part 1

Version and Protection Checks

Confirms firmware version, voltage, and current protection operations.

Control and Input Operation

Verifies remote control, headphone, and RDS functionality.

Sensor and Miscellaneous Checks

Monitors thermal sensor, output sensors, and general terminal operations.

Operation Checks - Part 2

Shipping Initialization and Knob Settings

Steps to initialize unit memories for shipping and check knob positions.

Test Mode Navigation and Usage

Detailed guide to entering and navigating various test modes for component checks.

Test Mode Frequency Data

FM and AM Band Frequency Presets

Lists frequencies for FM and AM bands automatically stored in test mode presets.

Special Operation Method (Temp/VOLH)

Method for checking temperature and VOLH values using Enter + Standby.

Exploded View - Overall Assembly

Main Component Identification Diagram

Illustrates key parts and their locations, including boards, chassis, and heatsink.

Rear Panel Connector Layout

Diagram of the rear panel showing various input/output connectors and terminals.

Heatsink and Power Transistor Assembly

Details the heatsink assembly and associated power transistors.

Exploded View Parts List (Model Variations)

Semiconductor and Chassis Parts

Lists transistors and chassis components for MDC (120V) and MPP (230V) models.

Cabinet and Panel Parts

Details front panel, rear panel, and cabinet parts for specific models.

Fuse and PC Board Part Numbers

Lists fuses, connectors, and PC board assemblies for different model variants.

Exploded View Parts List (Silver Model)

Semiconductor and Chassis Parts (Silver)

Lists transistors, screws, and chassis components for the silver unit.

Cabinet and Control Knobs (Silver)

Details front panel, clear plate, and various control knobs for the silver model.

Fuse and PC Board Parts (Silver)

Lists fuses, connectors, and PC board part numbers for the silver model.

Schematic Diagrams - Part 1 (ASP Section)

Amplifier PC Board (U0010) Details

Detailed schematic of the Amplifier PC Board (BAAF-1472), including input/output signals.

Signal Path and Board Connections

Illustrates how audio signals flow through the amplifier section and connect to other boards.

Component Layout on ASP Board

Shows the layout and connections of components on the Amplifier section board.

Schematic Diagrams - Part 2 (Amplifier Section)

Amplifier Channel Circuit Layout

Detailed circuit diagram for amplifier channels L/0, R/4, L/1, R/5, L/2, R/6.

Power Distribution to Amplifier Stages

Shows how power supply voltages are distributed to the amplifier stages.

Output Stage Component Details

Illustrates the output transistors and related components for each speaker channel.

Schematic Diagrams - Part 3 (Class-A Amplifier)

Class-A Amplifier Circuit Diagram

Detailed circuit diagram for the Class-A amplifier stage (U0020).

Quiescent Current Adjustment

Instructions for adjusting bias current (quiescent current) in the amplifier.

Class-A Amplifier Component List

Lists specific components within the Class-A amplifier section and their values.

Schematic Diagrams - Part 4 (Thermal Sensor)

Thermal Sensor Circuit Details

Diagram of the thermal sensing component (Q6300A) and its connection.

Thermal Sensor Board Connections

Shows the connection of the thermal sensor board (U0012) to the main board (BADG-1474).

Schematic Diagrams - Part 5 (Terminal Section)

Terminal Board Pin Assignments

Diagram of the terminal board (U0011) and its pin assignments.

Connector Pinout Information

Details the pin configurations for sockets and plugs on the terminal board.

Wire Harness and Jumper Lead Connections

Illustrates connections made via wire harnesses and jumper leads.

Schematic Diagrams - Part 6 (Headphone Jack)

Headphone Jack Circuitry Details

Diagram of the headphone jack (U0014) and its associated components (L5501-L5503).

Headphone Signal Routing

Shows how headphone signals (HP_L, HP_R) and ground are routed.

Schematic Diagrams - Part 7 (Display Section)

FL Display Driver Circuitry

Circuitry for driving the FL display, including signal input and control pins.

Front Panel Control Interface

Shows connections for front panel buttons (KEY0, KEY1, etc.) and volume control.

Display Board Interconnections

Details connections between the display board and other boards (BAETC-1442).

Schematic Diagrams - Part 8 (Tone/Balance/Selector)

Tone Control Circuit Diagram

Circuit diagram for Bass and Treble controls (U0033).

Balance Control Circuit Diagram

Schematic for the balance control circuit.

Input Selector Switch Circuit

Circuit for the input selector switch (U0032) on the Input/Bass PC Board.

Schematic Diagrams - Part 9 (Switch/Standby)

Standby Switch Circuit Details

Diagram of the standby switch (S708) and associated components.

Standby LED Indicator Circuit

Shows the circuit for the standby LED (LEDSTBY).

Schematic Diagrams - Part 10 (Speaker Terminals)

Speaker Terminal Wiring Diagram

Diagram showing connections for Speaker A and B terminals.

Output Relays and Protection Components

Illustrates output relays (RL6801, RL6802) and protection components.

Output Signal SW_OUT Path

Shows the path of the SW_OUT signal and its connections.

Schematic Diagrams - Part 11 (MPU Section)

MPU Board Component Layout

Diagram of the MPU board (U0035) showing its pins and external connections.

MPU Signal Routing

Illustrates the signal routing for various functions controlled by the MPU.

Schematic Diagrams - Part 12 (Power Supply)

Power Supply Board Circuitry

Detailed diagram of the power supply board (U0036), including transformers and regulators.

Power Supply Voltage Outputs

Lists the various voltage outputs (+12V, +10V, etc.) from the power supply.

Fuse and AC Cord Specifications

Shows fuse ratings and AC power cord input details.

Schematic Diagrams - Part 13 (Tuner Section)

Tuner PC Board (U0040) Details

Diagram of the tuner PC board (BARF-1450) and its internal components.

RF and IF Signal Path

Illustrates the signal flow for radio frequency (RF) and intermediate frequency (IF) stages.

Tuner Control Signal Lines

Shows control signals like VDD, GND, and data lines for the tuner.

Schematic Diagrams - Part 14 (Digital Section)

Digital PC Board (U0050) Diagram

Diagram of the digital PC board (BADG-1269) showing its complex circuitry.

Microprocessor Interface Connections

Details connections between the microprocessor and other digital components.

Packing Procedures and Parts List

Packaging Material Components

Details pads, sheets, tape, and cartons used in packaging.

Accessory Item Listings

Lists accessories like poly bags, warranty cards, and instruction manuals.

Model-Specific Packing Parts

Differentiates packing parts for MDC (Black) and MPP (Silver) models.

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