Onkyo R 31 Service Manual
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Extracted text from Onkyo R 31 Service Manual (Ocr-read)
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