Yamaha RX-V850 - Service Manual

STEREO RECEIVER
RX-V1070/V870/V850
F IMPORTANT NOTICE ^
This manual has been provided for the use of authorized YAMAHA Retailers and their service personnel.
It has been assumed that basic service procedures inherant to the industry, and more specifically YAMAHA
Products, are already known and understood by the users, and have therefore not been restated.
WARNING: Failure to follow appropriate service and safety procedures when servicing this product
may result in personal injury, destruction of expensive components and failure of the
product to perform as specified. For these reasons, we advise all YAMAHA product owners
that all service required should be performed by an authorized YAMAHA Retailer or the
appointed service representative.
IMPORTANT: The presentation or sale of this manual to any individual or firm does not constitute
authorization, certification or recognition of any applicable technical capabilities, or
establish a principle-agent relationship of any form.
The data provided is believed to be accurate and applicable to the unit(s) indicated on the cover. The reserch,
engineering, and service departments of YAMAHA are continually striving to improve YAMAHA products.
Modifications are, therefore, inevitable and specifications are subject to change without notice or obligation to
retrofit. Should any discrepancy appear to exist, please contact the distributor's Service Division.
WARNING: Static discharges can destroy expensive components. Discharge any static electricity your
body may have accumulated by grounding yourself to the ground buss in the unit (heavy
gauge black wires connect to this buss).
IMPORTANT: Turn the unit OFF during disassembly and parts replacement. Recheck all work before you
apply power to the unit. i
• CONTENTS ——————
TO SERVICE PERSONNEL........................................... 1
FRONT PANELS ............................................................1
REARPANELS...............................................................2
SPECIFICATIONS ...................................................... 3-4
BLOCK DIAGRAM .....................................................5-7
INTERNAL VIEW............................................................8
DISASSEMBLY PROCEDURES ................................8-9
PROTECTION FUNCTION........................................... 10
ADJUSTMENT IN POWER AMPLIFIER SECTION ....10
ADJUSTMENT IN TUNER SECTION ....................11-14
DIAGNOSTIC OPERATION ...................................15-16
ICDATA..................................................................17-20
DISPLAY DATA............................................................21
PRINTED CIRCUIT BOARD ..................................22-41
WAVEFORM OF TEST POINT..............................42-43
SCHEMATIC DIAGRAM .........................................44-48
PARTS LIST...........................................................49-78
REMOTE CONTROL TRANSMITTER ...................79-80

Summary

Important Notice

To Service Personnel

Panel Views and Specifications

Diagrams of front/rear panels and detailed technical specifications.

Block Diagram and Internal View

Internal layout, signal flow diagrams, and component views.

Disassembly, Protection, and Adjustments

Procedures for dismantling, understanding protection, and making adjustments.

Diagnostic Operation and IC Data

Guide for self-diagnosis modes and pin assignments for key integrated circuits.

Component Data and Parts Lists

IC data, display information, schematic diagrams, and comprehensive parts lists.

Remote Control Transmitter

Schematic diagram and exploded view of the remote control unit.

Exploded and Mechanical Views

Exploded Views

Visual breakdown of unit construction for component identification.

Mechanical Parts Lists

List of physical components and fasteners used in the unit.

Yamaha RX-V850 Specifications

General

Channels	5.1
Frequency Response	20Hz to 20kHz
Total Harmonic Distortion	0.08%
Input Sensitivity	2.5mV (MM), 150mV (line)
Dimensions	17.1 x 6.5 x 15.4 inches
Weight	25.3 lbs
Power Output	100 W per channel (8 ohms)
Signal-to-Noise Ratio	100 dB
Tuning range	FM, MW
Damping factor	100
Signal to noise ratio	100 dB
Speaker load impedance	8 ohms