JVC GR-AXM18US, GR-SXM38US Diagram

SERVICE MANUAL

COMPACT VHS CAMCORDER

YF12620062

GR-AXM18US, GR-SXM38US

GR-AXM18USM[M6A622], GR-SXM38USM[M6C623]

For disassembling and assembling of MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700 (MECHANISM ASSEMBLY). Lead free solder used in the board (material : Sn-Ag-Cu, melting point : 219 Centigrade)

TABLE OF CONTENTS

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

2 SPECIFIC SERVICE INSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

3 DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-17

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-22

No.YF126

2006/2

SPECIFICATION

General Format VHS NTSC standard (GR-AXM18US)

S-VHS/VHS NTSC standard (GR-SXM38US)

Power source DC 11 V (Using AC Adapter)

DC 6 V (Using battery pack)

Power consumption Viewfinder on 3.5 W

LCD monitor on 4.3 W

LED light* 0.4 W

* GR-SXM38US only.

Maximum 9.2 W (When charging a battery)

Signal system NTSC-type

Video recording system Luminance FM recording

Colour Converted sub-carrier direct recording Conforms to VHS standard

Cassette cassette (GR-AXM18US), / cassette (GR-SXM38US)

Tape speed SP 33.35 mm/sec. (1-5/16 ips)

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

Recording time (max.) SP 40 minutes

EP 120 minutes (with TC-40 cassette)

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)

Weight Approx. 770 g (1.7 lbs.) (GR-AXM18US), 774 g (1.71 lbs.) (GR-SXM38US)

Dimensions (W × H × D) 81 mm × 125 mm × 216 mm(3-1/4" × 4-15/16" × 8-9/16")

(with the LCD monitor closed and with the viewfinder fully tilted downward)

Pickup 1/6" format CCD

Lens F1.8 f = 2.2 mm to 44 mm, 20:1 power zoom lens with auto iris and macro

control (GR-AXM18US) / F1.8 f = 2.2 mm to 55 mm, 25:1 power zoom lens with auto iris and macro control (GR-SXM38US)

Filter diameter Ø 30.5 mm

Viewfinder Electronic viewfinder with 0.16" black/white LCD

White balance adjustment Auto/Manual adjustment

LCD monitor 2.50" diagonally measured LCD panel/TFT active matrix system

Speaker Monaural

Connectors Video 1 V (p-p), 75 Ω unbalanced, analog output (via Video output connector)

Audio 300 mV (rms), 1 kΩ, analog output (via Audio output connector) S-Video (GR-SXM38US) Y : 1 V (p-p), 75 Ω, analog output

C : 0.29 V (p-p), 75 Ω, analog output

AC Adapter

Power requirement U.S.A and Canada AC 120 V to 60 V~

Other countries AC 110 V to 240 V~, 50 Hz/60 Hz

Output DC 11 V, 1 A

Specifications shown are for SP mode unless otherwise indicated. E & O.E. Design and specifications subject to change without notice.

1-2 (No.YF126)

SECTION 1

PRECAUTION

1.1 SAFTY 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.

1.1.1 Precautions during Servicing

(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 comply 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 comply 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:

• Wires covered with PVC tubing

• Double insulated wires

• High voltage leads

(5) Use specified insulating materials for hazardous live parts.

Note especially:

• Insulation Tape

• PVC tubing

•Spacers

• Insulation sheets for transistors

•Barrier

(6) When replacing AC primary side components (transformers,

power cords, noise blocking capacitors, etc.) wrap ends of wires securely about the terminals before soldering.

emission. Consequently, when servicing these products, replace the cathode 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 connectorIn 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 connectors, if replacing the connectors is unavoidable, in order to prevent safety hazards, perform carefully and precisely according to the following steps.

• Connector part number :E03830-001

• Required tool : Connector crimping tool of the proper type which will not damage insulated parts.

• Replacement procedure

a) Remove the old connector by cutting the wires at a

point close to the connector.Important : Do not reuse a connector (discard it).

cut close to connector

Fig.1-1-3

b) 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.1-1-4

c) Align the lengths of the wires to be connected.

Insert the wires fully into the connector.

Metal sleeve

Fig.1-1-1

(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.

Power cord

Fig.1-1-2 (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

Connector

Fig.1-1-5

d) As shown in Fig.1-1-6, 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.

1.2 5

2.0

5.5

Crimping tool

Fig.1-1-6

e) Check the four points noted in Fig.1-1-7.

Not easily pulled free

Wire insulation recessed

more than 4 mm

Crimped at approx. cente

of metal sleeve

Conductors extended

Fig.1-1-7

(No.YF126)1-3

1.1.2 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 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 Fig.1-1-11 below.

(3) Clearance distance

When replacing primary circuit components, confirm specified clearance distance (d), (d') between soldered terminals, and between terminals and surrounding metallic parts. See Fig.1-1-11 below.

Chassis

Power cord primary wire

Fig.1-1-8

(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 Fig.1-1-9 and following Fig.1-1-12.

Externally exposed accessible part

Fig.1-1-9

(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 Fig.1-1-10 and grounding specifications.

AC inlet

Earth pin

Exposed accessible part

MIlli ohm meter

Grounding Specifications

Region

USA & Canada

Europe & Australia

Grounding Impedance (Z

Z 0.1 ohm

Z 0.5 ohm

)

Fig.1-1-10

AC Line Voltage

100 V

100 to 240 V

110 to 130 V

200 to 240 V

Region

Japan

USA & Canada

Europe & Australia

Insulation Resistance (R

R 1 M /500 V DC

1 M R 12 M /500 V DC

R 10 M /500 V DC

)

Dielectric Strength

AC 1 kV 1 minute

AC 1.5 kV 1 minute

AC 1 kV 1 minute AC 3 kV 1 minute

AC 1.5 kV 1 minute

(

Class

(

Class

Clearance Distance (d), (d'

d, d' 3 mm

d, d' 4 mm

d, d' 3.2 mm

d 4 m m

)

d' 8 m m (Power cord d' 6 m m (Primary wire

)

Fig.1-1-11

AC Line Voltage

100 V

110 to 130 V

220 to 240 V

Region

Japan

USA & Canada

Europe & Australia

Load Z

0.15

1.5

Leakage Current (i)

i 1 mA rms

i 0.5 mA rms

i 0.7 mA peak i 2 mA dc

a, b, c

Exposed accessible parts

Antenna earth terminals

Other terminals

Fig.1-1-12

NOTE :

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

)

1-4 (No.YF126)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

2.1 DIFFERENCE LIST

The following table indicate main different points between models GR-AXM18US and GR-SXM38US.

MODEL GR-AXM18US GR-SXM38US

TAPE FORMAT VHS-C S-VHS-C

VIDEO(LED) LIGHT NO YES

S-VHS ON/OFF NO YES

S OUTPUT NO YES

A / V CABLE YES NO

CASSETTE ADAPTER NO(OPTIONAL) YES(PROVIDED)

C-P8U

(No.YF126)1-5

SECTION 3

DISASSEMBLY

3.1 BEFORE ASSEMBLY AND DISASSEMBLY

3.1.1 Precautions

• Be sure to disconnect the power supply unit prior to mounting and soldering of parts.

• Prior to removing a component part that needs to disconnect its connector(s) and its screw(s), first disconnect the wire(s) from the connector(s), and then remove the screw(s).

• When connecting/disconnecting wires, pay enough attention not to damage the connectors.

• When inserting the flat wire to the connector, pay attention to the direction of the flat wire.

• Be careful in removing the parts to which some spacer or shield is attached for reinforcement or insulation.

• When replacing chip parts (especially IC parts), first remove the solder completely to prevent peeling of the pattern.

• Tighten screws properly during the procedures. Unless specified otherwise, tighten screws at a torque of 0.196N

·cm). However, 0.196N·m (2.0kgf·cm) is a value at the

(2.0kgf time of production. At the time of service, perform the procedure at a torque 10% less than 0.196N

·m (2.0kgf·cm).

(See "SERVICE NOTE" as for tightening torque.)

3.1.2 Destination of connectors

Two kinds of double-arrows in connection tables respectively

show kinds of connector/wires.

: Wire: Flat wire : Board to board (B-B)

: The connector of the side to remove

CONN. No. PIN No.CONNECTOR

CN2a

CN2b

MAIN CN101

MAIN CN103

MONI/ BW CN761

MIC CN762

3.1.3 Disconnection of connectors (Wires)

Wire

· Pull both ends of the connector in the arrow direction, remove the lock and disconnect the flat wire.

B-B Connector

· Pull the both ends of the board in the direction of the arrow, and remove the B-B Connector.

FPC Connector

· Extend the locks in the direction of the arrow for unlocking and then pull out the wire. After removing the wire, immediately restore the locks to their original positions because the locks are apt to come off the connector.

Wire

FPC Connector

Lock

B-B Connector

Fig.3-1-1

3.1.4 Tools required for disassembly and assembly

Torque driver

YTU94088

Chip IC replacement jig

PTS40844-2

Bit

YTU94088-003

Cleaning cloth

KSMM-01

Tweezers

P-895

·m

• Torque driver

Be sure to use to fastening the mechanism and exterior parts because those parts must strictly be controlled for tightening torque.

• Bit

This bit is slightly longer than those set in conventional torque drivers.

• Tweezers

To be used for removing and installing parts and wires.

• Chip IC replacement jig

To be used for replacement of IC.

• Cleaning cloth

Recommended cleaning cloth to wipe down the video heads, mechanism (tape transport system), optical lens surface.

3.2 ASSEMBLY AND DISASSEMBLY OF MAIN PARTS

3.2.1 Assembly and disassembly

When reassembling, perform the step(s) in reverse order.

STEP

No.

[1] [2]

[8]

PART

TOP COVER ASSY UPPER ASSY (Inc. VF ASSY, SPEAKER/MONITOR) VF ASSY

(∗1) Order of steps in Procedure

When reassembling, preform the step(s) in the reverseorder. These numbers are also used as the identification (location) No. of parts Figures.

(∗2) Part to be removed or installed. (∗3) Fig. No. showing Procedure or Part Location.

C = CABINET

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

released, unplugged, unclamped or unsoldered.

S = Screw L = Lock, Release, Hook SD = Solder CN = Connector

[Example]

• 4 (S1a) = Remove 4 S1a screws.

• 3 (L1a) = Disengage 3 L1a hooks.

• 2 (SD1a) = Unsolder 2 SD1a points.

• CN1a = Remove a CN1a connector.

(∗5) Adjustment information for installation.

Fig. No.

Fig.C1 Fig.C2-1

Fig.C2-2

POINT

S1,2(L1) S2a,2(S2b),3(S2c) 2(S2d),S2e,S2c L2,CN2a,b 2(S8),L8,CN8a

( 4) ( 5)( 2) ( 3)( 1)

NOTE

NOTE 8a NOTE 8b

1-6 (No.YF126)

Fig.3-1-2

3.2.2 ASSEMBLY/DISASSEMBLY OF CABINET PARTS AND ELECTRICAL PARTS

zDisassembly procedure

STEP

PART NAME

No.

[1]

CASE COVER(M) ASSY LOWER CASE ASSY

[2]

TOP COVER ASSY

[3]

(Inc.TOP BOARD ASSY,VF ASSY)

[4]

TOP BOARD ASSY

[5]

VF ASSY

[6]

UPPER CASE(M) ASSY (Inc.COVER(UPPER/M) ASSY, MONITOR ASSY)

[7]

COVER(UPPER/M) ASSY

[8]

MONITOR ASSY

[9]

FRONT COVER ASSY Inc. DC LIGHT,MIC

[10]

FRONT BOARD ASSY

[11]

MIC

[12]

FRONT FRAME SA

[13]

MAIN BOARD ASSY

[14]

OP FRAME ASSY

[15]

BRACKET OP ASSY

[16]

OP BLOCK ASSY

[17]

SIELD CASE(MAIN)

[18]

MECHANISM ASSY

[19]

REAR BOARD ASSY

[20]

FRAME ASSY

Fig. No.

FA1

S1,2(L1)

FA2

6(S2),CN2a,CN2b S3a,S3b,CN3a,CN3b

2(S4) 3(S5)

FA3

6(S6a),S6b,L6,CN6

FA4

2(S7a),S7b S8a,L8a,L8b,SHEET(FPC),2(S8b)

FA5

CN9a,CN9b,S9,L9a,L9b

S10 S11 2(S12)

FA6

CN13a, b, c, d, e, f, g, h, 2(S13), CN13j,L13

FA7

2(S14a), S14b S15

FA8

S17a,S17b 2(S18a),S18b

FA9

S19

POINT NOTE

NOTE8a,b,c,d

NOTE9a,b

NOTE10

NOTE12

NOTE16 NOTE17

NOTE 5 :

For disassembly of the [5] VF ASSEMBLY, refer to 3.2.3 ASSEMBLY/DISASSEMBLY OF [5] VF ASSEMBLY .

NOTE 6 :

Take care not to break or damage the FRAME.

NOTE5 NOTE6

NOTE 16 :

For disassembly of the CCD BOARD ASSEMBLY, refer to

3.2.5 ASSEMBLY AND DISASSEMBLY OF [16] OP BLOCK ASSEMBLY AND CCD BOARD ASSEMBLY .

NOTE 17 :

When attaching the MECHANISM ASSEMBLY to S.CASE (MAIN), pull out the FPC CABLE not to be inserted between the MECHANISM ASSEMBLY and S.CASE (MAIN).

zDestination of connectors

CN.NO.

CN2a MAIN CN27 SPEAKER - 2

CN2b MAIN CN13 ZOOM UNIT - 14

CN3a MAIN CN7301 B/W VF ASSY CN7401 14

CN3b MAIN CN18 TOP CN401 6

CN6 MAIN CN16 MONITOR BL CN7601 25

CN9a MAIN CN6 LAMP(DC LIGHT) - 3

CN9b MAIN CN8 MIC - 2

CN13a MAIN CN3 CAPSTAN MOTOR - 18

CN13b MAIN CN7 A/C HEAD - 11

CN13c MAIN CN22 CCD CN5301 14

CN13d MAIN CN15 OP BLOCK ASSY - 24

CN13e MAIN CN4 LOADING MOTOR - 2

CN13f MAIN CN1 DRUM_MOTOR - 10

CN13g MAIN CN5 HEAD(VIDEO,FLY.E) - 11

CN13h MAIN CN2 SENSOR - 14

CN13j MAIN CN28 REAR_UNIT - 10

NOTE 8a :

Take care not to cut the FPC wire.

NOTE 8b :

Insert and attach the SHEET(FPC) between the MONITOR FPC and the UPPER CASE(M)ASSEMBLY.

NOTE 8c :

Attachment of the FPC.

NOTE 8d :

For disassembly of the [8] MONITOR ASSEMBLY, refer to

3.2.4 ASSEMBLY/DISASSEMBLY OF [8] MONITOR ASSEMBLY.

NOTE 9a :

Take care not to damage the OP BLOCK ASSEMBLY when and after the FRONT CASE ASSEMBLY is removed.

NOTE 9b :

Attachment of the WIRE.

NOTE 10 :

There are models that do not have FRONT BOARD ASSY.

NOTE 12 :

Screwing sequence should be in order here first and others.

CONNECTOR

PIN NO.

(No.YF126)1-7

CN1a

(S1)

[1]

L3a

[5]

NOTE5

L5a L5b

C.COVER INSIDE

Fig.FA1

L3b

CN3a

CN2b

[3]

CN3b

1-8 (No.YF126)

(S5)

(S4)

FFC WIRE

[4]

OP BLOCK ASSY

(S3b)

Fig.FA2

CN1a

CN2a

dd aa

(S3a)

(S2)

[2]

(S2)

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