JVC GRDVM76U - Service Manual Immediate Download

SERVICE MANUAL

No. 86680

April 2002

SPECIFICATIONS (The specifications shown pertain specifically to the model GR-DVM76,DVM96)

DIGITAL VIDEO CAMERA

Printed in Japan

This service manual is printed on 100% recycled paper.

GR-DVM76U

No.

86680

GR-DVM76U

JVC SERVICE & ENGINEERING COMPANY OF AMERICA

DIVISION OF JVC AMERICAS CORP.

Head office

East Coast

Midwest

West Coast

Atlanta

Hawaii

1700 Valley Road Wayne, New Jersey 07470-9976

10 New Maple Avenue Pine Brook, New Jersey 07058-9641

705 Enterprise Street Aurora, Illinois 60504-8149

5665 Corporate Avenue Cypress, California 90630-0024

1500 Lakes Parkway Lawrenceville, Georgia 30043-5857

2969 Mapunapuna Place Honolulu, Hawaii 96819-2040

(973)317-5000

(973)396-1000

(630)851-7855

(714)229-8011

(770)339-2582

(808)833-5828

JVC CANADA INC.

Head office

Montreal

Vancouver

21 Finchdene Square Scarborough, Ontario M1X 1A7

16800 Rte Trans-Canadienne, Kirkland, Quebec H9H 5G7

13040 Worster Court Richmond, B.C. V6V 2B3

(416)293-1311

(514)871-1311

(604)270-1311

S40895-04

For Connectors

Video output

: 1 V (p-p), 75

, analog

Audio output

: 300 mV (rms), 1 k

, analog, stereo

Headphone output

: Stereo

(GR-DVM96 only)

S-VIDEO

: Y: 1 V (p-p), 75

, analog output

C: 0.29 V (p-p), 75

, analog output

Input/output

: 4-pin, IEEE 1394 compliant

USB

: 5-pin

EDIT

: ø3.5 mm, 2-pole

AC Adapter

For General

Power requirement

U.S.A. and Canada

: AC 120 V ` , 60 Hz

Other countries

: AC 110 V to 240 V ` , 50 Hz/60 Hz

Output

: DC 11.0 V } , 1.0 A

Specifications shown are for SP mode unless otherwise indicated. E & O.E.

Design and specifications subject to change without notice.

Camcorder

For General

Power supply

: DC 11.0 V (Using AC Adapter)

DC 7.2 V (Using battery pack)

Power consumption

LCD monitor off, viewfinder on : Approx. 4.5 W (GR-DVM96)/Approx. 3.8 W (GR-DVM76)

LCD monitor on, viewfinder off : Approx. 5.4 W (GR-DVM96)/Approx. 4.7 W (GR-DVM76)

Dimensions (W x H x D)

: 54 mm x 113.5 mm x 96 mm (2-3/16" x 4-1/2" x 3-13/16")

(with the LCD monitor closed and the viewfinder pushed back in)

Weight

: Approx. 490 g (1.1 lbs)

(incl. grip belt)

Operating temperature

:0°C to 40°C (32°F to 104°F)

Operating humidity

: 35% to 80%

Storage temperature

: 20°C to 50°C (4°F to 122°F)

Pickup

: 1/3.8" CCD (GR-DVM96)

1/4" CCD (GR-DVM76)

Lens

: F 1.8, f = 3.8 mm to 38 mm, 10:1 power zoom lens (GR-DVM96)

F 1.8, f = 3.6 mm to 36 mm, 10:1 power zoom lens (GR-DVM76)

Filter diameter

: ø27 mm

LCD monitor

: 2.5" diagonally measured, LCD panel/TFT active matrix system

Viewfinder

: Electronic viewfinder with 0.44" black/white LCD

Speaker

: Monaural

For Digital Video Camera

Format

: DV format (SD mode)

Signal format

: NTSC standard

Recording/Playback format

: Video : Digital component recording

Audio : PCM digital recording, 32 kHz 4-channel (12-bit), 48 kHz

2-channel (16-bit)

Cassette

: Mini DV cassette

Tape speed

: SP: 18.8 mm/s

LP: 12.5 mm/s

Maximum recording time

: SP: 80 min.

(using 80 min. cassette)

LP: 120 min.

For Digital Still Camera

Storage media

: SD Memory Card/MultiMediaCard

Compression system

: Still image : JPEG (compatible)

Moving image*: MPEG4 (compatible)

File size

Still Image

: 3 modes (1280 x 960 pixels*/1024 x 768 pixels/640 x 480 pixels)

Moving Image*

: 1 mode (160 x 120 pixels)

Picture quality

: 2 modes (FINE/STANDARD)

Approximate number of storable images : « pg. 50

* GR-DVM96 only

}

Important Safety Precautions

INSTRUCTIONS

1. DISASSEMBLY

1.1 BEFORE ASSEMBLY AND DISASSEMBLY ......................... 1-1

1.1.1 Precautions ..................................................................... 1-1

1.1.2 Assembly and disassembly ............................................ 1-1

1.1.3 Destination of connectors ............................................... 1-1

1.1.4 Disconnection of connectors (Wires) .............................. 1-1

1.2 JIGS AND TOOLS REQUIRED FOR DISASSEMBLY,

ASSEMBLY AND ADJUSTMENT ......................................... 1-2

1.2.1 Tools required for adjustments ........................................ 1-2

1.3 DISASSEMBLY/ASSEMBLY OF CABINET PARTS AND

BOARD ASSEMBLY ............................................................. 1-2

1.3.1 Disassembly flow chart ................................................... 1-2

1.3.2 Disassembly method ...................................................... 1-3

1.4 DISASSEMBLY OF 5 MONITOR ASSEMBLY ..................... 1-6

1.4.1 5 Monitor assembly/Hinge assembly ............................. 1-6

1.4.2 Hinge assembly .............................................................. 1-6

1.5 DISASSEMBLY OF 8 OP BLOCK ASSEMBLY/CCD BOARD

ASSEMBLY ........................................................................... 1-7

1.5.1 Precautions ..................................................................... 1-7

1.5.2 How to remove OP block assembly and CCD board assembly 1-7

1.5.3 How to install OP block assembly and CCD board assembly 1-7

1.5.4 Replacement of service parts ......................................... 1-7

1.6 DISASSEMBLY OF 0 E. VF ASSEMBLY .............................. 1-8

1.6.1 0E. VF assembly ............................................................ 1-8

1.7 EMERGENCY DISPLAY ....................................................... 1-9

1.8 SERVICE NOTE .................................................................. 1-10

1.9 HOW TO TAKE OUT CASSETTE TAPE MANUALLY .......... 1-11

1.9.1 How to remove cassette tape manually from the set .... 1-11

2. MECHANISM ADJUSTMENT

2.1 PRELIMINARY REMARKS ON ADJUSTMENT AND REPAIR .. 2-1

2.1.1 Precautions ..................................................................... 2-1

2.1.2 Notes on procedure for disassemby/assembly ............... 2-1

2.2 JIGS AND TOOLS REQUIRED FOR DISASSEMBLY,

ASSEMBLY AND ADJUSTMENT ......................................... 2-2

2.2.1 Tools required for adjustments ........................................ 2-2

2.3 DISASSEMBLY/ASSEMBLY OF MECHANISM ASSEMBLY 2-3

2.3.1 General statement .......................................................... 2-3

2.3.2 Explanation of mechanism mode ................................... 2-3

2.3.3 Mechanism timing chart .................................................. 2-4

2.4 DISASSEMBLY/ASSEMBLY OF MECHANISM ASSEMBLY 2-5

2.4.1 Follow chart .................................................................... 2-5

2.4.2 Disassembly/assembly ................................................... 2-8

2.4.3 List of procedures for disassembly ............................... 2-14

2.5 CHECKUP AND ADJUSTMENT OF MECHANISM PHASE .. 2-15

2.6 MECHANISM ADJUSTMENTS .......................................... 2-16

2.6.1 Assembling slide deck assembly and main deck assembly . 2-16

2.6.2 Locating tension pole .................................................... 2-17

2.7 SERVICE NOTE .................................................................. 2-18

2.8 COMPATIBILITY ADJUSTMENT ........................................ 2-20

2.8.1 Jig connector cable connection .................................... 2-20

2.8.2 Tape pattern check ....................................................... 2-21

TABLE OF CONTENTS

Section

Title

Page

Section

Title

Page

3. ELECTRICAL ADJUSTMENT

3.1 PRECAUTION ....................................................................... 3-1

3.2 SETUP .................................................................................. 3-2

4. CHARTS AND DIAGRAMS

NOTES OF SCHEMATIC DIAGRAM .......................................... 4-1

CIRCUIT BOARD NOTES ........................................................... 4-2

4.1 BOARD INTERCONNECTIONS ........................................... 4-3

4.2 AUDIO MUTE SCHEMATIC DIAGRAM ...................................... 4-5

4.3 SYSCON SCHEMATIC DIAGRAM ............................................. 4-7

4.4 PC IF AND V OUT SCHEMATIC DIAGRAMS ............................ 4-9

4.5 D.CPU SCHEMATIC DIAGRAM ............................................... 4-11

4.6 DVMAIN SCHEMATIC DIAGRAM ............................................ 4-13

4.7 PRE/REC SCHEMATIC DIAGRAM .......................................... 4-15

4.8 CAMERA DSP SCHEMATIC DIAGRAM .................................. 4-17

4.9 OP DRV SCHEMATIC DIAGRAM ............................................ 4-19

4.10 REG SCHEMATIC DIAGRAM ................................................ 4-21

4.11 DSC SCHEMATIC DIAGRAM ................................................ 4-23

4.12 TG AND IR/TALLY SCHEMATIC DIAGRAMS ....................... 4-25

4.13 MDA SCHEMATIC DIAGRAM ................................................ 4-27

4.14 MONITOR SCHEMATIC DIAGRAM ....................................... 4-29

4.15 JACK SCHEMATIC DIAGRAM .............................................. 4-31

4.16 SD AND STROBE SCHEMATIC DIAGRAMS ........................ 4-33

4.17 MAIN AUDIO SCHEMATIC DIAGRAM .................................. 4-35

4.18 DECK OPE AND VF MAIN SCHEMATIC DIAGRAMS .......... 4-37

4.19 B/W VF AND CCD SCHEMATIC DIAGRAMS ....................... 4-39

4.20 MAIN CIRCUIT BOARD ......................................................... 4-41

4.21 MDA CIRCUIT BOARD .......................................................... 4-47

4.22 MONITOR CIRCUIT BOARD ................................................. 4-49

4.23 JACK CIRCUIT BOARD ......................................................... 4-51

4.24 AUDIO CIRCUIT BOARD ....................................................... 4-53

4.25 CCD, VF, WB, MONI SW AND MENU CIRCUIT BOARDS ... 4-55

4.26 SD AND STROBE CIRCUIT BOARDS .................................. 4-57

4.27 VOLTAGE CHARTS ............................................................... 4-58

4.28 POWER SYSTEM BLOCK DIAGRAM ................................... 4-63

4.29 VIDEO SYSTEM BLOCK DIAGRAM ...................................... 4-65

5. PARTS LIST

5.1 PACKING AND ACCESSORY ASSEMBLY <M1> ............... 5-1

5.2 FINAL ASSEMBLY <M2> ..................................................... 5-3

5.3 MECHANISM ASSEMBLY <M3> ......................................... 5-7

5.4 ELECTRONIC VIEWFINDER ASSEMBLY <M4> ................ 5-9

5.5 MONITOR ASSEMBLY <M5> ............................................ 5-10

5.6 ELECTRICAL PARTS LIST ................................................. 5-11

MAIN BOARD ASSEMBLY <01> ............................................. 5-11

MDA BOARD ASSEMBLY <02> .............................................. 5-18

CCD BOARD ASSEMBLY <03> .............................................. 5-18

MONITOR BOARD ASSEMBLY <04> ..................................... 5-18

JACK BOARD ASSEMBLY <05> ............................................. 5-19

SD BOARD ASSEMBLY <06> ................................................. 5-20

STROBE BOARD ASSEMBLY <07> ....................................... 5-20

AUDIO BOARD ASSEMBLY <08> .......................................... 5-21

B/W VF BOARD ASSEMBLY <09> ......................................... 5-22

W/B BOARD ASSEMBLY <11> ............................................... 5-22

MONI SW BOARD ASSEMBLY <12> ..................................... 5-22

MENU BOARD ASSEMBLY <13> ........................................... 5-22

Important Safety Precautions

Prior to shipment from the factory, JVC products are strictly inspected to conform with the recognized product safety and electrical codes of the

countries in which they are to be sold. However, in order to maintain such compliance, it is equally important to implement the following precautions

when a set is being serviced.

Fig.1

1. Locations requiring special caution are denoted by labels and in-

scriptions on the cabinet, chassis and certain parts of the product.

When performing service, be sure to read and comply with these

and other cautionary notices appearing in the operation and serv-

ice manuals.

2. Parts identified by the

! symbol and shaded (

) parts are

critical for safety.

Replace only with specified part numbers.

Note: Parts in this category also include those specified to com-

ply with X-ray emission standards for products using

cathode ray tubes and those specified for compliance

with various regulations regarding spurious radiation

emission.

3. Fuse replacement caution notice.

Caution for continued protection against fire hazard.

Replace only with same type and rated fuse(s) as specified.

4. Use specified internal wiring. Note especially:

1) Wires covered with PVC tubing

2) Double insulated wires

3) High voltage leads

5. Use specified insulating materials for hazardous live parts. Note

especially:

1) Insulation Tape

3) Spacers

5) Barrier

2) PVC tubing

4) Insulation sheets for transistors

6. When replacing AC primary side components (transformers, power

cords, noise blocking capacitors, etc.) wrap ends of wires securely

about the terminals before soldering.

Power cord

Fig.2

10. Also check areas surrounding repaired locations.

11. Products using cathode ray tubes (CRTs)

In regard to such products, the cathode ray tubes themselves, the

high voltage circuits, and related circuits are specified for compli-

ance with recognized codes pertaining to X-ray emission.

Consequently, when servicing these products, replace the cath-

ode ray tubes and other parts with only the specified parts. Under

no circumstances attempt to modify these circuits.

Unauthorized modification can increase the high voltage value and

cause X-ray emission from the cathode ray tube.

12. Crimp type wire connector

In such cases as when replacing the power transformer in sets

where the connections between the power cord and power trans-

former primary lead wires are performed using crimp type connec-

tors, if replacing the connectors is unavoidable, in order to prevent

safety hazards, perform carefully and precisely according to the

following steps.

1) Connector part number : E03830-001

2) Required tool : Connector crimping tool of the proper type which

will not damage insulated parts.

3) Replacement procedure

(1) Remove the old connector by cutting the wires at a point

close to the connector.

Important : Do not reuse a connector (discard it).

Fig.7

cut close to connector

Fig.3

(2) Strip about 15 mm of the insulation from the ends of the

wires. If the wires are stranded, twist the strands to avoid

frayed conductors.

15 mm

Fig.4

(3) Align the lengths of the wires to be connected. Insert the

wires fully into the connector.

Connector

Metal sleeve

Fig.5

(4) As shown in Fig.6, use the crimping tool to crimp the metal

sleeve at the center position. Be sure to crimp fully to the

complete closure of the tool.

·Precautions during Servicing

7. Observe that wires do not contact heat producing parts (heatsinks,

oxide metal film resistors, fusible resistors, etc.)

8. Check that replaced wires do not contact sharp edged or pointed

parts.

9. When a power cord has been replaced, check that 10-15 kg of

force in any direction will not loosen it.

1.2

2.0

5.5

Crimping tool

Fig.6

(5) Check the four points noted in Fig.7.

Not easily pulled free

Crimped at approx. center

of metal sleeve

Conductors extended

Wire insulation recessed

more than 4 mm

S40888-01

·Safety Check after Servicing

Examine the area surrounding the repaired location for damage or deterioration. Observe that screws, parts and wires have been returned

to original positions, Afterwards, perform the following tests and confirm the specified values in order to verify compliance with safety

standards.

1. Insulation resistance test

Confirm the specified insulation resistance or greater between power cord plug prongs and exter-

nally exposed parts of the set (RF terminals, antenna terminals, video and audio input and output

terminals, microphone jacks, earphone jacks, etc.). See table 1 below.

2. Dielectric strength test

Confirm specified dielectric strength or greater between power cord plug prongs and exposed acces-

sible parts of the set (RF terminals, antenna terminals, video and audio input and output terminals,

microphone jacks, earphone jacks, etc.). See table 1 below.

3. Clearance distance

When replacing primary circuit components, confirm specified clearance distance (d), (d') be-

tween soldered terminals, and between terminals and surrounding metallic parts. See table 1

below.

4. Leakage current test

Confirm specified or lower leakage current between earth ground/power cord plug prongs and

externally exposed accessible parts (RF terminals, antenna terminals, video and audio input and

output terminals, microphone jacks, earphone jacks, etc.).

Measuring Method : (Power ON)

Insert load Z between earth ground/power cord plug prongs and externally exposed accessible

parts. Use an AC voltmeter to measure across both terminals of load Z. See figure 9 and following

table 2.

5. Grounding (Class 1 model only)

Confirm specified or lower grounding impedance between earth pin in AC inlet and externally exposed accessible parts (Video in, Video out,

Audio in, Audio out or Fixing screw etc.).

Measuring Method:

Connect milli ohm meter between earth pin in AC inlet and exposed accessible parts. See figure 10 and grounding specifications.

Fig. 10

Fig. 9

Fig. 8

Table 1 Specifications for each region

Table 2 Leakage current specifications for each region

Note: These tables are unofficial and for reference only. Be sure to confirm the precise values for your particular country and locality.

S40888-01

Externally

exposed

accessible part

1-1

(1)

(2)

(3)

(4)

(5)

SECTION 1

DISASSEMBLY

1.1.4 Disconnection of connectors (Wires)

Connector

Pull both ends of the connector in the arrow direction, re-

move the lock and disconnect the flat wire.

1.1 BEFORE ASSEMBLY AND DISASSEMBLY

1.1.1 Precautions

1. Be sure to remove the power supply unit prior to mount-

ing and soldering of parts.

2. When removing a component part that needs to discon-

nect the connector and to remove the screw for remov-

ing itself, first disconnect the connecting wire from the

connector and then remove the screw beforehand.

3. When connecting and disconnecting the connectors, be

careful not to damage the wire.

4. Carefully remove and handle the part to which some

spacer or shield is attached for reinforcement or insula-

tion.

5. When replacing chip parts (especially IC parts), desolder

completely first (to prevent peeling of the pattern).

6. Tighten screws properly during the procedures.

Unless specified otherwise, tighten screws at a torque

of 0.078N·m(0.8kgf·cm).

1.1.2 Assembly and disassembly

(1) Indicate the disassembly steps. When assembling, per-

form in the reverse order of these steps. This number

corresponds to the number in the disassembly diagram.

(2) Indicates the name of disassembly/assembly parts.

(3) Indicates the number in the disassembly diagram.

(4) Indicates parts and points such as screws, washers,

springs which must be removed during disassembly/

assembly.

Symbol

Name, Point

Screw

Lock, Pawl, Hook

Soldering

(Others) Connector, Cover, Bracket, etc.

(Example)

· 2 (S1) : Remove the two screws (S1) for removing the

part 1.

· CN 1a: Disconnect the connector 1a.

· SD 1 : Unsolder at the point SD 1.

(5) Precautions on disassembly/assembly.

Fig. 1-1-1 Connector 1

Connector

Flat wire

Fig. 1-1-2 Connector 2

Connector

Flat wire

Extend the locks in the direction of the arrow for unlocking

and then pull out the wire. After removing the wire, immedi-

ately restore the locks to their original positions because

the locks are apt to come off the connector.

B-B connector

Pull the board by both the sides in the direction of the ar-

row for disconnecting the B-B connector.

Fig. 1-1-3 Connector 3

Connector

Fig. 1-1-4 Connector 4

Connector

1 FRONT COVER

Fig.1-3-1, (S1a), (S1b), 2(S1c), (S1d), NOTE1 a

ASSY

Fig.1-3-2 (S1e)

NOTE1 b

(Remove screw No.1 6)

NOTE1 c

STEP

No.

PART

Fig.No.

POINT

NOTE

CONN.

No.

Pin No.

CONNECTOR

CN2a

MAIN

CN103

JACK

CN501

CN2b

MAIN

CN104

MONITOR

CN761

45/39

1.1.3 Destination of connectors

Note:

Three kinds of double-arrows in connection tables re-

spectively show kinds of connector/wires.

: Wire

: Flat wire (FPC, FFC)

: Board to Board connector

[Example]