Yamaha RX-485 Service Manual

STEREO RECEIVER
RX-485/
RX-485RDS
SERVICE MANUAL
IMPORTANT NOTICE
This manual has been provided for the use of authorized YAMAHA Retailers and their selVice personnel.
It has been assumed that basic selVice procedures inherent 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 selVice and safety procedures when selVicing 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 any selVice required should be perfonned by an authorized YAMAHA Retailer or the
appointed selVice representative.
IMPORTANT:
The presentation or sale of this manual to any individual or firm does not constitute
authorization, cenification 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 unites) indicated on the cover. The reseach,
engineering, and selVice depanments 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 SelVice 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:
Tum the unit OFF during disassembly and pan replacement. Recheck all work before you
apply power to the unit.
• CONTENTS
TO SERVICE PERSONNEL 1
FRONT PANELS 1 2
REAR PANELS 2 3
SPECIFICATIONS 4 5
INTERNAL VIEW 5
DISASSEMBLY PROCEDURES 6
AMP ADJUSTMENTS 6
TEST MODE 7
TUNER ADJUSTMENTS 8 11
RX-485 BLOCK DIAGRAM 12 13
RX-485RDS BLOCK DIAGRAM 14 15
RX-485
~-COM
DATA 16-17
RX-485RDS
~-COM
DATA 18-19
RX·485 DISPLAY DATA 20
RX·485RDS DISPLAY DATA 21
FRONT END PACK 22
TEST POINT WAVEFORMS 23
PRINTED CIRCUIT BOARD 24-33
SCHEMATIC DIAGRAM 34-39
PARTS LIST 40-48
REMOTE CONTROL TRANSMITTER 49
YAMAHA
YAMAHA CORPORATION
P.O.Box1,Hamamatsu,Japan
2.95K-223
IQl
®
Printed in Japan '94.4