Jvc HRXVC 20 U Service Manual

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TABLE OF CONTENTS

Section Title Page
Important Safety Precaulions
INSTRUCTIONS

DISASSEMBLY INSTRUCHONS

1 REMOVAL OF MECHANICAL PARTS AND P.C.BOARDS
171 TOP CABINET AND FRONT CABINET.
172 FLAP .......
173 DECK CD
14 VCR DECK .
175 VCR/DVD PCB

2 REMOVAL OF VCR
21 TOP BRACKET ..................
272 CASSETTE HOLDER ASSY.
273 CASSETTE SIDE UR

4 LINK UNIT ...............

5 LINK LEVER/FLAP LEVER .

6 LOADING MOTOR / WORM

7 TENSION ASSY

8 T BRAKE ARM /T

9 S REEL/T REEL/ IDLER ARM ASS'Y/IDLER GEAR

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O CASSETTE OPENER I PINCH ROLLER BLOCK / P5ARM ASS Y
I NC HEAD .

2 FE HEAD .I
3 CYLINDER UNIT ASSY
4 CAPSTAN DD UNIT
5 MAIN CAM I PINCH RO .
271s LOADING GEAR SIT UNIT ................................
2717 CLUTCH ASSY I RING SPRING I CLUTCH LEVER I CLUTCH GEAR
271s CASSETTE GUIDE POSTIINCLINED BASE SIT UNIT/P4 CAP
3L REMOVALAND INSTALLATION OF FLAT PACKAGE IC
REMOVAL
INSTALLATION
KEY TO ABBREV
SERVICE MODE LIST ......
WHEN N" Is ALWAYS BEING DISPLAYED ON THE TV MONITOR.
PARENTAL CONTROL- RATING LEVEL 4-DIGIT PASSWORD CANNCELLATION .
WHEN REPLACING EEPROM(MEMORY) IC .........
PREVENTIVE CHECKS AND SERVICE INTERVALS.
CONFIRMATION OF HOURS USED
CLEANING
SERVICING F
MECHANISM ADJUSTMENT PARTS LOCATION GUID
MECHANICAL ADJUSTMENT ................................
TAPE REMOVAL METHOD AT NO POWER SUPPLY .
DISC REMOVAL METHOD AT NO POWER SUPPLY
II CONFIRMATION AND ADJUSTMENT .....................
171 CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION .
172 CONFIRMATION OF PLAYBACK TORQUE AND
BACK TENSION TORQUE DURING PLAYBACK
173 CONFIRMATION OF VSR TORQUE IIIIIIIIIIII
174 CONFIRMATION OF REEL BRAKE TORQUE
2 CONFIRMATION AND ADJUSTMENT OF TAPE
RUNNING MECHANISM.
271 GUIDE ROLLER
272 CONFIRMATION ANDA .
273 TAPE RUNNING ADJUSTMENT(XFVALUE ADJUSTMENT). 1719
ELECTRICAL ADJUSTMENTS .
1 BASIC ADJUSMENT
171 SWITCHING POINT
ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE
IC DESCRIPTIONS .......
SERVO TIMING CHART ..
MECHANISM TIMING CHA
TROUBLE SHOOTING GUIDE
(VCR SECTION) .I
(DVD SECTION) I.

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Section Title Page

CHARTS AND DIAGRAMS
INTERCONNECTION DIAGRAM ................................
Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM .
VCR SYSCON SCHEMTAIC DIAGRAM Y
TUNER/JACK SCHEMATIC DIAGRAM ..
OPERATION/DISPLAY SCHEMATIC DIAGRAM.
HIEFIIDEMODULATOR SCHEMATIC DIAGRAM .
POWER SCHEMATIC DIAGRAM .......
MPEG/MICOM SCHEMATIC DIAGRAM Y
MEMORY SCHEMATIC DIAGRAM
DSP SCHEMATIC DIAGRAM ........
MOTOR DRV SCHEMATIC DIAGRAM
READ CHANNEL SCHEMATIC DIAGRAM
AUDIO/VIDEO SCHEMATIC DIARAM
OPERATION SCHEMATIC DIAGRAM
PRINTED CIRCUIT BOARD OPERATI
PRINTED CIRCUIT BOARD VCR/DVD
WAVEFORMS ..............
DVD BLOCK DIAGRAM
Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM
SYSTEM CONTROL BLOCK DIAGRAM
leFI/DEMODULATOR BLOCK DIAGRAM
TUNER/JACK BLOCK DIAGRAM Y
POWER BLOCK DIAGRAM ......

PARTS LIST
3Y1 PACKING AND ACCESSORY ASSEMBLY Y
32 FINAL ASSEMBLY .........
3.3 MECHANISM ASSEMBLY.
3Y4 ELECTRICAL PARTS LIST .....

VCR/DVD BOARD ASSEMBLY<03> .

OPERATION BOARD ASSEMBLY<28>

REFERENCE
SEMICONDUCTOR BASE CONNECTIONS .....
GENERAL SPECIFICATIONS[HREXV020US] Y.