Onkyo TX-DS474 Service Manual - Page 1

ONKYO ® SERVICE MANUAL TX-DS474 I Ref. No. 3615 AUDIO VIDEO CONTROL RECEIVER MODEL TX-DS474 0.143[1r0 Rft 1 CZ= I II I I I I I O O Black, Silver, and Golden models BMD BMP, BMPT, BMPA, SMP, GMFT BMWT, BMWR, GMWT, GMWR 120V AC, 60Hz 230-240V AC 50Hz 120/220V AC, 50/60Hz SAFETY-RELATED COMPONENT WARNING!! COMPONENTS IDENTIFIED BY MARK Lb. ON THE SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK. REPLACE THESE COMPONENTS WITH ONKYO PARTS WHOSE PARTS NUMBERS APPEAR AS SHOWN IN THIS MANUAL. MAKE LEAKAGE-CURRENT OR RESISTANCE MEASUREMENTS TO DETERMINE THAT EXPOSED PARTS ARE ACCEPTABLY INSULATED FROM THE SUPPLY CIRCUIT BEFORE RETURNING THE APPLIANCE TO THE CUSTOMER. ONKYO® AUDIO COMPONENTS Black and Golden models BMPT, GMPT BMWT, BMWR, GMWT, GMWR 230-240V AC 50Hz 120/220V AC, 50/60Hz TABLE OF CONTENTS Specifications 2 Service procedures 3 Microprocessor connection diagram TX-DS474 4 Microprocessor terminal description TX-DS474 5 Panel view TX-DS474 8 Block diagram Tuner section 12 PC board-parts list TX-DS474 19 Adjustment procedures 24 IC block diagram 27 Wiring view TX-DS474 31 Block diagram Amp. section 35 Schematic diagram 39 Exploded view TX-DS474 61 Parts list TX-DS474 63 Packing view TX-DS474 69 -1 -