Denon PMA-50 Service Manual

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Contents

ABOUT THIS MANUAL .............................................................3What you can do with this manual ............................................3Using Adobe Reader (Windows version) ..................................4SAFETY PRECAUTIONS ..........................................................6NOTE FOR SCHEMATIC DIAGRAM.........................................7NOTE FOR PARTS LIST ...........................................................7INSTRUCTIONS FOR HANDLING SEMI-CONDUCTORS ANDOPTICAL UNIT ..........................................................................71. Ground for Human Body ......................................................72. Ground for Workbench .........................................................7TECHNICAL SPECIFICATIONS ................................................9DIMENSION .............................................................................10PRECAUTIONS DURING SERVICE .......................................11Initializing This Unit .................................................................11Service Jig ..............................................................................11DISASSEMBLY ........................................................................121. MAIN ASSY .........................................................................142. FRONT ASSY......................................................................163. NFC PCB ............................................................................174. SIDE COVER ......................................................................185. BOTTOM COVER ...............................................................19SPECIAL MODE .....................................................................20Special mode setting button ....................................................201. Version Check mode ..........................................................212. Display / LED check mode .................................................213. Protection Check mode ......................................................225. Owner’s Manual described initialization mode (User Reset)23JIG FOR SERVICING ..............................................................24PROCEDURE AFTER REPLACING THE MICROPROCESSOR,ETC ..........................................................................................25Firmware Update Procedure..................................................261. Procedure for upgrading IC214 ..........................................26TROUBLE SHOOTING ............................................................341. OLED dosen't light ..............................................................342. No Sound, Noise generated ................................................352.1. COMMON(signal) .............................................................352.2. COMMON(Power, Control signal line) .............................362.3. Analog In .........................................................................372.4. USB In ..............................................................................382.5. Blutooth In ........................................................................382.6. Optical / Coaxial In ...........................................................38MEASURING METHOD AND WAVEFORMS .........................39BLOCK DIAGRAM...................................................................43POWER DIAGRAM ..................................................................44WIRING DIAGRAM ..................................................................45PRINTED CIRCUIT BOARDS..................................................46SCHEMATIC DIAGRAMS (1/11).............................................49MAIN_ADSP ...........................................................................49SCHEMATIC DIAGRAMS (2/11) .............................................50MAIN_DSP-USB_B .................................................................50SCHEMATIC DIAGRAMS (3/11) .............................................51MAIN_DIR_FPGA ...................................................................51SCHEMATIC DIAGRAMS (4/11) .............................................52MAIN_MCU .............................................................................52SCHEMATIC DIAGRAMS (5/11) .............................................53AMP_D_AMP ..........................................................................53SCHEMATIC DIAGRAMS (6/11) .............................................54AMP_POWER .........................................................................54SCHEMATIC DIAGRAMS (7/11) .............................................55AMP_D_AMP_OUT.................................................................55SCHEMATIC DIAGRAMS (8/11) .............................................56AMP_D_AMP_SW_HP_OUT_AUXIN .....................................56SCHEMATIC DIAGRAMS (9/11) .............................................57AMP_DAMP_FEEDBACK .......................................................57SCHEMATIC DIAGRAMS (10/11) ...........................................58FRONT ....................................................................................58SCHEMATIC DIAGRAMS (11-1/11) ........................................59SMPS 1/2 ................................................................................59SCHEMATIC DIAGRAMS (11-2/11) ........................................60SMPS 2/2 ................................................................................60EXPLODED VIEW ...................................................................61PACKING VIEW .......................................................................62SEMICONDUCTORS ...............................................................631. IC's .....................................................................................632. DISPLAY ............................................................................82CONTENTS2