Jvc HRXVC 21 UJ Service Manual

Page 2

TABLE OF CONTENTS

Section Title Page
Important Safety Precaulions
INSTRUCTIONS

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

1 TOP BRACKET ..................
2 CASSETTE HOLDER ASSY.
3 CASSETTE SIDE UR
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 ASS Y/ IDLER GEA
1O CASSETTE OPENER / PINCH ROLLER BLOCK / P5 ARM ASSY.
1

1
1
1
1
1
1

1 NC HEAD .

2 FE HEAD ..

3 CYLINDER UNIT ASSY

4 CAPSTAN DD UNIT ......

5 MAIN CAM / PINCH ROL /J .

6 LOADING GEAR S/T UNIT IIIIIIIIIIIIIIIIIIIIIIIIIIIIIIII

7 CLUTCH ASSY/ RING SPRING / CLUTCH LEVER / CLUTCH GEAFI..
18 CASSETTE GUIDE POST/ INCLINED BASE S/T UNIT / P4 CAP.
EMOVAL OF DVD DECK PARTS
1 TRAY
2 MAIN
3 RACK LOADING / MAIN GEAR/ ..
4 CLAMPER ASS'Y/ |NSULATOR(R) / LEVER SWITCH
5 TRAVERSE HOLDER / INSULATOR(F)
6 SWITCH PCB ASSY
7
8
9

RACK FEED ASS'Y.
RELAY PCB ASSY
GEAR.
a 10 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
1. 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 ............
174 CONFIRMATION OF REEL BRAKE TORQUE
2. CONFIRMATION AND ADJUSTMENT OF TAPE
RUNNING MECHANISM.
271 GUIDE ROLLER .............
272 CONFIRMATION AND ADJUSTMENT OF AUDIO/CONTROL HEAD .
273 TAPE RUNNING ADJUSTMENT(XFVALUE 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)

2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
32
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 SCHEMATIC DIAGRAM ......
TUNER/JACK SCHEMATIC DIAGRAM
OPERATION/DISPLAY SCHEMATIC DIAGRAM.
HIEFIIDEMODULATOR SCHEMATIC DIAGRAM .
POWER SCHEMATIC DIAGRAM ..............
OPERATION/LED SCHEMATIC DIAGRAM
SW/RELAY/FG SCHEMATIC DIAGRAM
MPEG/MICOM SCHEMATIC DIAGRAM.
MEMORY SCHEMATIC DIAGRAM
RF AMP/DSP SCHEMATIC DIAGRAM
AUDIO/VIDEO SCHEMATIC DIARAM
PRINTED CIRCUIT BOARD VCR .
PRINTED CIRCUIT BOARD DVD.
PRINTED CIRCUIT BOARD SW/RELAY/FG
PRINTED CIRCUIT BOARD OPERATION
Y/C/AUDIO/CCD/HEAD AMP BLOCK DIAGRAM
SYSTEM CONTROL BLOCK DIAGRAM
OPERATION/DISPLAY BLOCK DIAGRAM
HIEFI/DEMODULATOR BLOCK DIAGRAM
TUNER/JACK BLOCK DIAGRAM .
POWER BLOCK DIAGRAM
DVD BLOCK DIAGRAM
WAVEFORMS ..............

PARTS LIST
3.1 EXPLODED VIEW ....................................................
3.1.1 PACKING AND ACCESSORY ASSEMBLY
3.1.2 FINAL ASSEMBLY .......................
3.1.3 MECHANISM ASSEMBLY(DVD)
3.1.4 MECHANISM ASSEMBLY(VCR).
3.2 PARTS LIST .............................................
PACKING AND ACCESSORY ASSEMBLY .
FINAL ASSEMBLY ......................
MECHANISM ASSEMBLY(VCR)
MECHANISM ASSEMBLY(DVD)
VCR BOARD ASSEMBLY<03> .........

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OPERATION BOARD ASSEMBLY<28> ,12

DVD BOARD ASSEMBLY<50> ............ 312
REFERENCE

GENERAL SPECIFICATIONS[HREXVC21UJ] ......................... 4,1

Page 13

DISASSEMBLY INSTRUCTIONS

3. REMOVAL OF DVD DECK PARTS

NOTE

1. Do not disassemble the DVD DECK PARTS except listed
parts here. Minute adjustments are needed it the disas-
semble is done. If the repair is needed except listed parts,
replace the DVD MECHA ASS'Y.

3-1: TRAY (Refer to Fig. 3-1-A)

1. Set the Tray opened. (Refer to the DISC REMOVAL
METHOD AT NO POWER SUPPLY)
2. Unlock the support (D and remove the Tray.

Fig. 3-1-A

NOTE

1. In case of the Tray installation. install them as the circled
section of Fig. 3-1-B so that the each markers are met.

Tray

(623%...

4 ¥
l-I Weed; {-

Main Frame Ass'y

Fig. 3-1-B

3-2: MAIN CHASSIS ASSY (Refer I0 Fig. 3-2-A)

1. Remove the Main Chassis Assy from the Insulator (R).
2. Unlock the support CD.
3. Remove the Main Chassis Assy.

Insulator (R)
(Green)

Mam Frame Assy

Main cnassis Ass'y

Fig. 3-2-A

NOTE

1. In case of the Main Chassis Assy, install it from (1) to (6)
in order. (Refer to Fig. 3-2-8)

Mam Chassis Assy

Move it to the direction
of the arrow. fF , »

Main Frame Ass'y

Fig. 3-2-3

3-3: RACK LOADING/MAIN GEAR/ RACK LOADING
SPRING/ RACK L SPRING (Refer to Fig. 3-3)

1. Remove the Rack L Spring.

2. Press down the catcher (D and slide the Rack Loading.

3. Remove the Rack Loading, Rack Loading Spring and
Main Gear.

Rack Loading

Main Gear
Fiaek Loading Spring

Rack L Spring

Main Frame Assy

Fig. 3-3

3-4: CLAMPER ASSY/INSULATOR(R)/LEVER SWITCH
(Refer to Fig. 3-4-A)

. Remove the screw Q).

. Remove the Lever Switch.

. Remove the 2 Insulator (R).

. Press the Clamper and rotate the Clamper Plate clockwise,
then unlock the 3 supports (2).

. Remove the Clamper Plate, Clamper Magnet and Clamper.

Anew-n

U1

Insulator (R)
(Green) insuiaior (R)
(Green)

Clamper Plate
Clamper Magnei 4@

Main Frame

(,2) Fig. 3-4-A

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