Onkyo R 31 Service Manual

Page 1

R-21/R-3

Refs No.3455

ONKYO SERVICE MANUAL

QUARTZ SYNTHESIZED
TUNER AMPLIFIER

MODEL R-21/R-31

Black model

BIIMD. BHMDN

120V AC. 60Hz

BHMI. BIIMPVt BHMIF

230V AC 50Hz

BHMW

120 or 220V AC, SO/GOHz

EH MQA

240V AC, SOHZ

SAFETY-RELATED COMPONENT WARNINGI!

COMPONENTS IDENTIFIED BY MARKAON 'IIIE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST
ARF. CRITICAL FOR RISK OF FIRE AND El. c TRIC
SHOCK, REPLACE THESE COMPONENTS WITII
()NKYO PARI'SWIIOSE PARTS NUMBERS APPEAR
AS SHOWN IN THIS MANUAL.

MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE TIIA'I' EXPOSED
PAR'I'S ARE ACCEPTAHLY INSULATED FROM THE,
SUPPLY CIRCUIT BEFORE RETURNING TIIE
APPLIANCE 'IO THE CUSTOMER,

ON KYO
IIIIIIIII IIIIMPIIIIIIIIS

TABLE OF CONTENTS

Specifications ................................................

Service procedures .......................................
Exploded View
Partslist.
Block diagram

Microprocessor connection diagram ..........................
IC block diagrams and descriptions .............................................. 10
.14
.15

Description of bottom board

Packing View ....................
Adjustment procedures ...............................................
Printed circuit board views from bottom side ................................... 19
Schematic diagram
RAZI Tuner section 120V mode
R-Zl Amp. section 120V model ............................................ 23
R-Zl/R-3l Tuner section Otltcr models,
R-Zl Amp, section Other models.

R-SI Amp. section Other models
Printed circuit board views from bottom side ................................... 31

Printed circuit board-parts list ..................................................... 33