JVC GRAX760U/UC - Service Manual Immediate Download

SERVICE MANUAL

No.86596

January 2001

GR-AX760U,AX761U,SX860U

COMPACT VHS CAMCORDER

SPECIFICATIONS

Connectors

Video

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

analog output

(via Video output connector)

AC Adapter AP-V10U

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 V

, 1 A

Dimensions

: 59 mm x 31 mm x 69 mm

(W x H x D)

(2-3/8" x 1-1/4" x 2-3/4")

Weight

: Approx. 130 g (0.29 lbs)

Optional Accessories

· Battery Packs BN-V12U, BN-V20U, BN-V400U

· A/V (Audio/Video) Cable

· S-Video Cable QAM0004-004

· Compact S-VHS (

) Cassettes ST-C-40/30/20

· Compact VHS (

) Cassettes TC-40/30/20

· Active Carrying Bag CB-V7U

Camcorder

General

Format

: S-VHS (GR-SXM330/SX860

only)/VHS NTSC standard

Power source

: DC 11 V

(Using AC Adapter)

DC 6 V

(Using battery pack)

Power consumption

Viewfinder on

: 4.0 W (GR-SXM330/AXM230

only)

3.7 W (GR-SX860/AX760 only)

LCD monitor* on

: 4.5 W (GR-SXM330/AXM230

only)

Video light**

: 3.0 W

* Models equipped with LCD monitor only.

** GR-SXM330/AXM230 only.

Signal system

: NTSC-type

Video recording system

Luminance

: FM recording

Color

: Converted sub-carrier

direct recording

Conforms to VHS standard

Cassette

cassette

Tape speed

: 33.35 mm/sec. (1-5/16 ips)

: 11.12 mm/sec. (7/16 ips)

Recording time (max.)

: 40 minutes

: 120 minutes (with TC-40)

Operating

temperature

°C to 40°C (32°F to 104°F)

Operating humidity

: 35% to 80%

Storage temperature

: 20

°C to 50°C

°F to 122°F)

Weight

: Approx. 900 g (2.0 lbs)

(GR-SXM330/AXM230 only)

Approx. 720 g (1.6 lbs)

(GR-SX860/AX760 only)

Some accessories are not available in some areas. Please

consult your nearest JVC dealer for details on accessories

and their availability.

Specifications shown are for SP mode unless otherwise indicated. E & O.E. Design and specifications subject to change

without notice.

Dimensions

: 206 mm x 112 mm x 118 mm

(W x H x D)

(8-1/8" x 4-7/16" x 4-11/16")

(GR-SXM330/AXM230 only)

206 mm x 112 mm x 115 mm

(8-1/8" x 4-7/16" x 4-9/16")

(GR-SX860/AX760 only)

* Models equipped with LCD monitor only.

Pickup

: 1/4" format CCD

Lens

: F1.6, f = 3.9 mm to 62.4 mm,

16:1 power zoom lens with

auto iris and macro control,

filter diameter 40.5 mm

Viewfinder

: Electronic viewfinder with

0.55" color LCD

(GR-SX860 only)

Electronic viewfinder with 0.5"

black/white CRT

(GR-SXM330/AXM230/AX760

only)

White balance

adjustment

: Auto/Manual adjustment

LCD monitor

: 2.5" diagonally measured, LCD

panel/TFT active matrix system

Speaker

: Monaural

(models equipped with

LCD monitor only)

(models equipped with

LCD monitor only)

Audio

: 300 mV (rms), 1 k

analog

output

(via Audio output connector)

S-Video

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

analog output

C : 0.29 V (p-p), 75 ,

analog output

(GR-SXM330/SX860

only)

(The specifications shown pertain specifically to the model GR-AX760U,SX860U)

TABLE OF CONTENTS

Section

Title

Page

Important Safety Precautions

INSTRUCTIONS

1. DISASSEMBLY

1.1

SERVICE CAUTIONS .......................................................... 1-1

1.1.1

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

1.1.2

How to read the disassembly and assembly ................ 1-1

1.1.3

Connection of the wires ................................................ 1-1

1.2

TOOLS REQUIRED FOR ADJUSTMENTS ......................... 1-2

1.3

DISASSEMBLY/ASSEMBLY OF CABINET PARTS ............. 1-3

1.3.1

Disassembly flow chart ................................................. 1-3

1.3.2

Disassembly method .................................................... 1-4

1.4

DISASSEMBLY/ASSEMBLY OF CAMERA SECTION

AND DECK SECTION .......................................................... 1-8

1.4.1

Flowchart of disassembly ............................................. 1-8

1.4.2

Disassembly method .................................................... 1-8

1.5

REPLACEMENT OF CCD IMAGE SENSOR ..................... 1-10

1.5.1

Removal of CCD image sensor .................................. 1-10

1.5.2

Installation of new CCD image sensor ....................... 1-10

1.5.3

Replacement of CCD board assy ............................... 1-10

1.6

TAKE OUT CASSETTE TAPE ............................................ 1-11

1.7

EMERGENCY DISPLAY ..................................................... 1-12

1.8

DEMONSTRATION MODE ................................................ 1-12

1.9

SERVICE NOTE ................................................................. 1-14

2. MECHANISM ADJUSTMENT

2.1

Required adjustment tools ...................................................... 2-1

3. ELECTRICAL ADJUSTMENT

3.1

ELECTRICAL ADJUSTMENT ............................................... 3-1

3.1.1

PREPARATION ............................................................ 3-1

3.2

ELECTRONIC VIEWFINDER (E.VF) ADJUSTMENT .......... 3-3

3.2.1

Tilt ................................................................................. 3-3

3.2.2

Centering ...................................................................... 3-3

3.2.3

Vertical Scanning ......................................................... 3-3

3.2.4

Brightness .................................................................... 3-3

3.2.5

Foucs ............................................................................ 3-3

4. CHARTS AND DIAGRAMS

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

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

4.1

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

4.2

CPU SCHEMATIC DIAGRAM .............................................. 4-5

4.3

VTR ASP SCHEMATIC DIAGRAM ....................................... 4-7

4.4

MECHA MDA SCHEMATIC DIAGRAM ................................ 4-9

4.5

VTR DSP SCHEMATIC DIAGRAM .................................... 4-11

4.6

DSP SCHEMATIC DIAGRAM ............................................. 4-13

4.7

IRIS & AF/ZOOM SCHEMATIC DIAGRAM ........................ 4-15

4.8

VIDEO OUT SCHEMATIC DIAGRAM ................................ 4-17

4.9

REGULATOR SCHEMATIC DIAGRAM .............................. 4-19

4.10 LCD CTL SCHEMATIC DIAGRAM (FOR AX760U/UC) ....... 4-21

4.11 LCD CTL SCHEMATIC DIAGRAM (FOR AX761U,SX860U) ........ 4-23

4.12 JACK AND CCD SCHEMATIC DIAGRAM ......................... 4-25

4.13 C-VF BL SENSOR SCHEMATIC DIAGRAM

(FOR AX761U,SX860U) .................................................... 4-27

4.14 TOP OPE UNIT, ZOOM UNIT, REAR UNIT

AND SENSOR SCHEMATIC DIAGRAM .............................. 4-29

4.15 ELECTRONIC VIEWFINDER SCHEMATIC DIAGRAM

(FOR AX760U/UC) ............................................................. 4-31

4.16 MAIN CIRCUIT BOARD ..................................................... 4-33

4.17 CCD AND C-VF CIRCUIT BOARDS .................................. 4-39

4.18 ELECTRONIC VIEWFINDER CIRCUIT BOARD ............... 4-41

4.19 POWER SYSTEM BLOCK DIAGRAM ............................... 4-43

4.20 CPU/MDA SYSTEM BLOCK DIAGRAM ............................ 4-45

4.21 CAMERA SYSTEM BLOCK DIAGRAM .............................. 4-47

4.22 Y/C SYSTEM BLOCK DIAGRAM ....................................... 4-51

4.23 MONITOR SYSTEM BLOCK DIAGRAM ............................ 4-53

4.24 WAVEFORMS .................................................................... 4-55

4.25 VOLTAGE CHARTS ........................................................... 4-56

5. PARTS LIST

5.1

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

5.2

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

5.3

MECHANISM ASSEMBLY <M3> .......................................... 5-6

5.4

ELECTRONIC VIEWFINDER ASSEMBLY <M4> ................. 5-8

5.5

ELECTRICAL PARTS LIST ................................................ 5-10

MAIN BOARD ASSEMBLY <01> ........................................ 5-10

CCD BOARD ASSEMBLY <02> ......................................... 5-16

C-VF BL BOARD ASSEMBLY <06> ................................... 5-16

Section

Title

Page

The following table lists the differing points between Models GR-AX760U/UC and GR-AX761U,GR-SX860U in this series.

GR-AX760U

GR-AX760UC

GR-AX761U

GR-SX860U

VIDEO LIGHT

NOT USED

USED

NOT USED

IR RECEIVER

NOT USED

USED

NOT USED

TAPE FORMAT

VHS-C

S-VHS-C

S-VHS ON/OFF

NOT USED

USED

S-VHS ET

NOT USED

USED

S-VHS ET ON/OFF

NOT USED

USED

S OUT PUT

NOT USED

USED

LIGHT SW

NOT USED

USED

NOT USED

VIEW FINDER

B/W

COLOR

REMOTE CONTROL UNIT

NOT USED

USED

NOT USED

Note: Mark

+ is same as left.

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

inscriptions on the cabinet, chassis and certain parts of the

product. When performing service, be sure to read and com-

ply with these and other cautionary notices appearing in the

operation and service 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

compliance 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

transformer primary lead wires are performed using crimp type

connectors, if replacing the connectors is unavoidable, in or-

der 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.

1.25

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 compli-

ance with safety standards.

1. Insulation resistance test

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

externally 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

accessible 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 accessi-

ble 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.

Chassis

Power cord,

primary wire

Region

USA & Canada

Europe & Australia

Grounding Impedance (Z)

0.1 ohm

0.5 ohm

AC inlet

Earth pin

Exposed accessible part

Milli ohm meter

Grounding Specifications

Fig. 10

Externally

exposed

accessible part

Fig. 9

Fig. 8

Clearance Distance (d), (d')

d, d'

3 mm

d, d'

4 mm

d, d'

3.2 mm

1 M

R 12 M/500 V DC

Dielectric Strength

AC 1 kV 1 minute

AC 1.5 kV 1 miute

AC 1 kV 1 minute

AC Line Voltage

100 V

100 to 240 V

110 to 130 V

200 to 240 V

Japan

USA & Canada

Europe & Australia

10 M

/500 V DC

Region

Insulation Resistance (R)

1 M

/500 V DC

AC 3 kV 1 minute

(Class

AC 1.5 kV 1 minute

(Class

4 mm

8 mm (Power cord)

6 mm (Primary wire)

Table 1 Specifications for each region

a, b, c

Leakage Current (i)

AC Line Voltage

100 V

110 to 130 V

220 to 240 V

Japan

USA & Canada

1 mA rms

Exposed accessible parts

Antenna earth terminals

Other terminals

0.5 mA rms

0.7 mA peak

2 mA dc

0.7 mA peak

2 mA dc

Europe & Australia

Region

Load Z

1 k

2 k

1.5 k

0.15

µF

50 k

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

1-1

(1) Order of steps in Procedure

When reassembling, preform the step(s) in the reverse

order. These numbers are also used as the identifica-

tion (location) No. of parts Figures.

(2) Part to be removed or installed.

(3) Fig. No. showing Procedure or Part Location.

C = Cabinet

CA = Camera

D = Deck

(4) Identification of part to be removed, unhooked, unlocked,

released, unplugged, unclamped or unsoldered.

P = Spring

W = Washer

S = Screw

* = Unhook, unlock, release, unplug or unsolder.

2(S3) = 2 Screws (S3)

CN = Connector

(5) Adjustment information for installation.

CASSETTE

(S1),3(L1a),(L1b),(L1c)

COVER ASSEMBLY

Push button, spring

UPPER CASE

2(S2), (L2)

LOWER CASE

9(S3), (L3a), (L3b)

ASSEMBLY(INCL.

*CN 3a 3b

E. VF. ASSEMBLY)

CAP (RCA jack)

SECTION 1

DISASSEMBLY

1.1 SERVICE CAUTIONS

1.1.1

Precautions

1. Before disassembling/re-assembling the set as well as

soldering parts, make sure to disconnect the power

cable.

2. When disconnecting/connecting connectors, pay enough

attention to wiring not to damage it.

3. In general, chip parts such as resistor, shorting jumpers

(0-ohm resistor), ceramic capacitors, diodes, etc. can not

be reused after they were once removed.

4. When installing parts, be careful not to do with other parts

as well as not to damage others.

5. When removing ICs, be careful not to damage circuit

patterns.

6. Tighten screws properly during the procedures. Unless

specified otherwise, tighten screws at torque of 0.196 N·m

(2.0 kgf·cm).

1.1.2

How to read the disassembly and assembly

STEP

/LOC

PART

NO.

REMOVAL

(For Cabinet Parts)

Fig.

No.

1.1.3

Connection of the wires

1. Pull the connector structure upward to release the clamp

when removing or inserting the flat wire cable.

Fig. 1-1-1

Connector

Wire

Connector

Wire

Fig. 1-1-2

NOTE:

After removing the wire, return the stopper to

its original position, because it is apt to come

off if it is left open.

*UNLOCK/RELEASE/

UNPLUG/UNCLAMP/

UNSOLDER

(1)

(2)

(3)

(4)