Jvc HRXVC 25 U Service Manual

Page 2

TABLE OF CONTENTS

Section Title Page
Important Safety Precauiions
INSTRUCTIONS

DISASSEMBLV INSTRUCTIONS
1. REMOVAL OF MECHANICAL PARTS AND P.C.BOARDS
1E1 TOP CABINET AND FRONT CABINET.

1 TOP BRACKET ..................
2 CASSETTE HOLDER ASSY.

3 CASSETTE SIDE L/R
4 LINK UNIT ...............
5 LINK LEVER / FLAP LEVER .

6 LOADING MOTOR / WORM

7 TENSION ASSY ................

8 T BRAKE ARM /T BRAKE BAND
9 S REEL/T REEL/ IDLER ARM ASSY/ IDLER GEAR
1o CASSETTE OPENER/ PINCH ROLLER BLOCK/PsARM ASSY
11 NC HEAD .

12 FE HEAD ..

13 CYLINDER UNIT ASSY
14

15

1
1
1

CAPSTAN DD UNIT ......
MAIN CAM I PINCH ROL /J .
6 LOADING GEAR S/T UNIT ................................
7 CLUTCH ASSYIRING SPRING I CLUTCH LEVER/CLUTCH GEAR
8 CASSETTE GUIDE POST/ INCLINED BASE S/T UNIT/P4 CAP
EMOVAL OF DVD DECK PARTS
1 TRAY
2 MAIN
3 RACK LOADING / MAIN .
4 CLAMPER ASS'Y/ |NSULATOR(R) / LEVER SWITCH
5 TRAVERSE HOLDER / INSULATOR(F)
6
7
8
9

SWITCH PCB ASSY
RACK FEED ASS'Y.
RELAY PCB ASSY
GEAR.
3 1o IDLER
3 11 FEED MOTOR
KEY To ABBREVIATIONS
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 INTER
CONFIRMATION OF HOURS USED
CLEANING .....................................
SERVICING FIXTURES AND TOOLS
MECHANISM ADJUSTMENT PARTS LOCATION GUIDE
MECHANICAL ADJUSTMENTS ..............................
TAPE REMOVAL METHOD AT No POWER SUPPLY _
DISC REMOVAL METHOD AT No POWER SUPPLY
). CONFIRMATION AND ADJUSTMENT .....................
171 CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION .
172 CONFIRMATION OF PLAYBACK TORQUE AND
BACK TENSION TORQUE DURING PLAYBACK
1S CONFIRMATION OF VSR TORQUE 111111111111
174 CONFIRMATION OF REEL BRAKE TORQUE
2. CONFIRMATION AND ADJUSTMENT OF TAPE
RUNNING MECHANISM.
271 GUIDE ROLLER IIIIIIIIIIIII
272 CONFIRMATION AND ADJUSTMENT OF AUDIO/CONTROL HEAD .
273 TAPE RUNNING ADJUSTMENTIXEVALUE ADJUSTMENT).
ELECTRICAL ADJUSTMENTS .
1. BASIC ADJUSMENT
171 SWITCHING POINT
ELECTRICAL ADJuSTMEN
SERVO TIMING CHART .........
MECHANISM TIMING CHART
Ic DESCRIPTIONS ..............
TROUBLE SHOOTING GUIDE
(VCR SECTION) ._
(DVD SECTION)

2E
2
2
2
2E
2
2E
2
2E
2E
2
2
2E
2
2
2E
2E
2E
33*
3*
3
3*
3
3*
3*
3*
3*

1721
1721

Section Title Page

CHARTS AND DIAGRAMS
INTERCONNECTION DIAGRAM ................................
Y/C/AUDIO/CCD/HEAD AMP SCHEMATIC DIAGRAM .
SYSCON SCHEMTAIC DIAGRAM IIIIII
TUNER/JACK SCHEMATIC DIAGRAM
OPERATION/DISPLAY SCHEMATIC DIAGRAM.
HIEF|/DEMODULATOR SCHEMATIC DIAGRAM .
POWER SCHEMATIC DIAGRAM ..............
OPERATION/LED SCHEMATIC DIAGRAM
MPEG/MICOM SCHEMATIC DIAGRAM.
MEMORY SCHEMATIC DIAGRAM
RF AMP/DSP SCHEMATIC DIAGRAM
AUDIO/VIDEO SCHEMATIC DIARAM
WAVEFORMS
PRINTED CIRC
PRINTED CIRCUIT BOARD DVD.
PRINTED CIRCUIT BOARD OPERATION.
Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM
SYSTEM CONTROL BLOCK DIAGRAM
OPERATION/DISPLAY BLOCK DIAGRAM
HIEF|/DEMODULATOR BLOCK DIAGRAM
TUNER/JACK BLOCK DIAGRAM .
POWER BLOCK DIAGRAM
DVD BLOCK DIAGRAM .....

PARTS LIST

3.1 EXPLODED VIEW.
3.1.1 PACKING AND A
3.1.2 FINAL ASSEMBLY .......................
3.1.3 MECHANISM ASSEMBLY(DVD)
3.1.4 MECHANISM ASSEMBLY(VCR).

3.2 ELECTRICAL PARTS LIST ......................
PACKING AND ACCESSORY PARTS L|ST
FINAL PARTS L|ST ...........
MECHANISM PARTS L|ST
MECHANISM PARTS L|ST
VCR BOARD ASSEMBLY<03> ..

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OPERATION BOARD ASSEMBLY<28> E12

DVD BOARD ASSEMBLY<50> ............ 3E12
REFERENCE

GENERAL SPECIFICATIONS[HREXVC25US] ........................ 4E1