Table Of Contents - JVC HR-XVC20US Service Manual

Section
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

TABLE OF CONTENTS

Title Page Section
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
Title Page