JVC HR-XVC20US - Default Chapter; Table of Contents

TABLE OF CONTENTS
Section Title Page Section Title Page
Important Safety Precautions
INSTRUCTIONS
DISASSEMBLY INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS AND P.C.BOARDS ............... 1-1
1-1 TOP CABINET AND FRONT CABINET ............................ 1-1
1-2 FLAP ..................................................................................1-1
1-3 DECK CD...........................................................................1-1
1-4 VCR DECK ........................................................................1-2
1-5 VCR/DVD PCB ..................................................................1-2
2. REMOVAL OF VCR DECK PARTS.........................................1-3
2-1 TOP BRACKET..................................................................1-3
2-2 CASSETTE HOLDER ASS’Y.............................................1-3
2-3 CASSETTE SIDE L/R ........................................................1-3
2-4 LINK UNIT .........................................................................1-3
2-5 LINK LEVER / FLAP LEVER ............................................. 1-3
2-6 LOADING MOTOR / WORM.............................................. 1-4
2-7 TENSION ASS’Y ................................................................1-4
2-8 T BRAKE ARM / T BRAKE BAND...................................... 1-5
2-9
S REEL / T REEL / IDLER ARM ASS’Y / IDLER GEAR .............. 1-5
2-10
CASSETTE OPENER / PINCH ROLLER BLOCK / P5 ARM ASS’Y ............. 1-6
2-11 A/C HEAD ........................................................................ 1-6
2-12 FE HEAD ......................................................................... 1-6
2-13 CYLINDER UNIT ASS’Y .................................................. 1-6
2-14 CAPSTAN DD UNIT......................................................... 1-7
2-15
MAIN CAM / PINCH ROLLER CAM / JOINT GEAR ............ 1-7
2-16 LOADING GEAR S/T UNIT..............................................1-7
2-17
CLUTCH ASS’Y / RING SPRING / CLUTCH LEVER / CLUTCH GEAR ............... 1-8
2-18
CASSETTE GUIDE POST / INCLINED BASE S/T UNIT / P4 CAP.............. 1-8
3.
REMOVAL AND INSTALLATION OF FLAT PACKAGE IC ........... 1-9
REMOVAL ................................................................................1-9
INSTALLATION ......................................................................1-10
KEY TO ABBREVIATIONS ...................................................... 1-11
SERVICE MODE LIST..............................................................1-13
WHEN “N” IS ALWAYS BEING DISPLAYED ON THE TV MONITOR . 1-13
PARENTAL CONTROL - RATING LEVEL 4-DIGIT PASSWORD CANNCELLATION . 1-13
WHEN REPLACING EEPROM(MEMORY) IC ......................... 1-14
PREVENTIVE CHECKS AND SERVICE INTERVALS............. 1-15
CONFIRMATION OF HOURS USED ....................................... 1-15
CLEANING ...............................................................................1-15
SERVICING FIXTURES AND TOOLS...................................... 1-16
MECHANISM ADJUSTMENT PARTS LOCATION GUIDE............ 1-16
MECHANICAL ADJUSTMENT ................................................1-17
TAPE REMOVAL METHOD AT NO POWER SUPPLY .......... 1-17
DISC REMOVAL METHOD AT NO POWER SUPPLY........... 1-17
1. CONFIRMATION AND ADJUSTMENT ................................. 1-17
1-1
CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION . 1-17
1-2 CONFIRMATION OF PLAYBACK TORQUE AND
BACK TENSION TORQUE DURING PLAYBACK ........... 1-17
1-3 CONFIRMATION OF VSR TORQUE............................... 1-17
1-4 CONFIRMATION OF REEL BRAKE TORQUE................ 1-18
2. CONFIRMATION AND ADJUSTMENT OF TAPE
RUNNING MECHANISM .................................................. 1-18
2-1 GUIDE ROLLER ..............................................................1-18
2-2
CONFIRMATION AND ADJUSTMENT OF AUDIO/CONTROL HEAD . 1-19
2-3
TAPE RUNNING ADJUSTMENT(X-VALUE ADJUSTMENT) . 1-19
ELECTRICAL ADJUSTMENTS ...............................................1-20
1. BASIC ADJUSMENT ............................................................ 1-20
1-1 SWITCHING POINT ........................................................ 1-20
ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE ............ 1-20
IC DESCRIPTIONS .................................................................. 1-21
SERVO TIMING CHART ..........................................................1-24
MECHANISM TIMING CHART .................................................1-25
TROUBLE SHOOTING GUIDE ................................................1-26
(VCR SECTION) ....................................................................1-26
(DVD SECTION) ....................................................................1-49
CHARTS AND DIAGRAMS
INTERCONNECTION DIAGRAM ............................................2-1
Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM .......... 2-3
VCR SYSCON SCHEMTAIC DIAGRAM ................................. 2-5
TUNER/JACK SCHEMATIC DIAGRAM .................................. 2-7
OPERATION/DISPLAY SCHEMATIC DIAGRAM....................2-9
HI-FI/DEMODULATOR SCHEMATIC DIAGRAM .................. 2-11
POWER SCHEMATIC DIAGRAM ......................................... 2-13
MPEG/MICOM SCHEMATIC DIAGRAM ............................... 2-15
MEMORY SCHEMATIC DIAGRAM ....................................... 2-17
DSP SCHEMATIC DIAGRAM................................................2-19
MOTOR DRV SCHEMATIC DIAGRAM ................................. 2-21
READ CHANNEL SCHEMATIC DIAGRAM ........................... 2-23
AUDIO/VIDEO SCHEMATIC DIARAM .................................. 2-25
OPERATION SCHEMATIC DIAGRAM .................................. 2-27
PRINTED CIRCUIT BOARD OPERATION............................ 2-29
PRINTED CIRCUIT BOARD VCR/DVD................................. 2-31
WAVEFORMS ....................................................................... 2-35
DVD BLOCK DIAGRAM ........................................................ 2-37
Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM ................. 2-39
SYSTEM CONTROL BLOCK DIAGRAM...............................2-41
HI-FI/DEMODULATOR BLOCK DIAGRAM ........................... 2-43
TUNER/JACK BLOCK DIAGRAM ......................................... 2-45
POWER BLOCK DIAGRAM .................................................. 2-47
PARTS LIST
3.1 PACKING AND ACCESSORY ASSEMBLY<M1> ................ 3-1
3.2 FINAL ASSEMBLY<M2> ...................................................... 3-2
3.3 MECHANISM ASSEMBLY<M4> .......................................... 3-4
3.4 ELECTRICAL PARTS LIST .................................................. 3-7
VCR/DVD BOARD ASSEMBLY<03> ....................................... 3-7
OPERATION BOARD ASSEMBLY<28> ................................. 3-15
REFERENCE
SEMICONDUCTOR BASE CONNECTIONS.......................... 4-1
GENERAL SPECIFICATIONS[HR-XVC20US] ........................ 4-2