Table Of Contents - JVC HR-XVC25US 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 DVD DECK ........................................................................ 1-1
1-4 DVD PCB ........................................................................... 1-2
1-5 VCR DECK ........................................................................ 1-2
1-6 VCR 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 OF DVD DECK PARTS ......................................... 1-9
3-1 TRAY .................................................................................. 1-9
3-2 MAIN CHASSIS ASS'Y ...................................................... 1-9
3-3 RACK LOADING / MAIN GEAR / RACK LOADING SPRING . 1-9
3-4 CLAMPER ASS'Y / INSULATOR(R) / LEVER SWITCH .... 1-9
3-5 TRAVERSE HOLDER / INSULATOR(F) .......................... 1-10
3-6 SWITCH PCB ASS'Y ....................................................... 1-10
3-7 RACK FEED ASS'Y ......................................................... 1-10
3-8 RELAY PCB ASS'Y .......................................................... 1-11
3-9 GEAR ............................................................................... 1-11
3-10 IDLER ARM ................................................................... 1-11
3-11 FEED MOTOR ............................................................... 1-12
KEY TO ABBREVIATIONS ...................................................... 1-13
SERVICE MODE LIST .............................................................. 1-15
WHEN "N" IS ALWAYS BEING DISPLAYED ON THE TV MONITOR . 1-15
PARENTAL CONTROL - RATING LEVEL 4-DIGIT PASSWORD CANNCELLATION . 1-16
WHEN REPLACING EEPROM(MEMORY) IC ......................... 1-16
PREVENTIVE CHECKS AND SERVICE INTERVALS ............. 1-17
CONFIRMATION OF HOURS USED ....................................... 1-17
CLEANING ............................................................................... 1-17
SERVICING FIXTURES AND TOOLS ...................................... 1-18
MECHANISM ADJUSTMENT PARTS LOCATION GUIDE ............ 1-18
MECHANICAL ADJUSTMENTS .............................................. 1-19
TAPE REMOVAL METHOD AT NO POWER SUPPLY .......... 1-19
DISC REMOVAL METHOD AT NO POWER SUPPLY ........... 1-19
1. CONFIRMATION AND ADJUSTMENT ................................. 1-19
1-1 CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION . 1-19
1-2 CONFIRMATION OF PLAYBACK TORQUE AND
BACK TENSION TORQUE DURING PLAYBACK ........... 1-19
1-3 CONFIRMATION OF VSR TORQUE ............................... 1-19
1-4 CONFIRMATION OF REEL BRAKE TORQUE ................ 1-20
2. CONFIRMATION AND ADJUSTMENT OF TAPE
RUNNING MECHANISM .................................................. 1-20
2-1 GUIDE ROLLER .............................................................. 1-20
2-2 CONFIRMATION AND ADJUSTMENT OF AUDIO/CONTROL HEAD . 1-21
2-3 TAPE RUNNING ADJUSTMENT(X-VALUE ADJUSTMENT) . 1-21
ELECTRICAL ADJUSTMENTS ............................................... 1-22
1. BASIC ADJUSMENT ............................................................ 1-22
1-1 SWITCHING POINT ........................................................ 1-22
ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE ............ 1-22
SERVO TIMING CHART .......................................................... 1-23
MECHANISM TIMING CHART ................................................. 1-24
IC DESCRIPTIONS .................................................................. 1-25
TROUBLE SHOOTING GUIDE ................................................ 1-28
(VCR SECTION) .................................................................... 1-28
(DVD SECTION) .................................................................... 1-51

TABLE OF CONTENTS

Title Page Section
CHARTS AND DIAGRAMS
INTERCONNECTION DIAGRAM ............................................ 2-1
Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM .......... 2-3
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
OPERATION/LED SCHEMATIC DIAGRAM .......................... 2-15
MPEG/MICOM SCHEMATIC DIAGRAM ............................... 2-17
MEMORY SCHEMATIC DIAGRAM ....................................... 2-19
RF AMP/DSP SCHEMATIC DIAGRAM ................................. 2-21
AUDIO/VIDEO SCHEMATIC DIARAM .................................. 2-23
WAVEFORMS ....................................................................... 2-25
PRINTED CIRCUIT BOARD VCR ......................................... 2-27
PRINTED CIRCUIT BOARD DVD ......................................... 2-31
PRINTED CIRCUIT BOARD OPERATION ............................ 2-34
Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM ................. 2-35
SYSTEM CONTROL BLOCK DIAGRAM ............................... 2-37
OPERATION/DISPLAY BLOCK DIAGRAM ........................... 2-39
HI-FI/DEMODULATOR BLOCK DIAGRAM ........................... 2-41
TUNER/JACK BLOCK DIAGRAM ......................................... 2-43
POWER BLOCK DIAGRAM .................................................. 2-45
DVD BLOCK DIAGRAM ........................................................ 2-47
PARTS LIST
3.1 EXPLODED VIEW ................................................................ 3-1
3.1.1 PACKING AND ACCESSORY ASSEMBLY<M1> .......... 3-1
3.1.2 FINAL ASSEMBLY<M2> ................................................ 3-2
3.1.3 MECHANISM ASSEMBLY(DVD)<MN> .......................... 3-3
3.1.4 MECHANISM ASSEMBLY(VCR)<M4> .......................... 3-4
3.2 ELECTRICAL PARTS LIST .................................................. 3-6
PACKING AND ACCESSORY PARTS LIST<M1> ................... 3-6
FINAL PARTS LIST<M2> ......................................................... 3-6
MECHANISM PARTS LIST<M4> ............................................. 3-6
MECHANISM PARTS LIST<MN> ............................................ 3-7
VCR BOARD ASSEMBLY<03> ............................................... 3-8
OPERATION BOARD ASSEMBLY<28> ................................ 3-12
DVD BOARD ASSEMBLY<50> .............................................. 3-12
REFERENCE
GENERAL SPECIFICATIONS[HR-XVC25US] ........................ 4-1
Title Page