JVC GR-DZ7AC, GR-DZ7AG, GR-DZ7AH, GR-DZ7AS, GR-DZ7EK Service Manual

SERVICE MANUAL

DIGITAL VIDEO CAMERA

YF05720048

GR-DZ7AC, GR-DZ7AG, GR-DZ7AH,

GR-DZ7AS, GR-DZ7EK, GR-DZ7EX,

GR-DZ7EY, GR-DZ7EZ

GR-DZ7AC, GR-DZ7AG, GR-DZ7AH, GR-DZ7AS, GR-DZ7EK,
GR-DZ7EX, GR-DZ7EY, GR-DZ7EZ[M4D6S5]

For disassembling and assembling of MECHANISM ASSEMBLY, refer to the SERVICE MANUAL No.86700(MECHANISM ASSEMBLY).

TABLE OF CONTENTS

1 PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

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

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

4 ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

5 TROUBLE SHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-24

COPYRIGHT © 2004 Victor Company of Japan, Limited

No.YF057

2004/8

SPECIFICATION (The specifications shown pertain specifically to the model GR-DZ7EK)

1-2 (No.YF057)

SECTION 1

r

e

PRECAUTIONS

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 sleev

Conductors extended

Fig.1-1-7

(No.YF057)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.

d

Chassis

d'

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.

ab

Externally
exposed
accessible part

Z

V

c

A

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

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

110 to 130 V

220 to 240 V

Region

Japan

USA & Canada

Europe & Australia

Load Z

1

0.15

1.5

2

50

Leakage Current (i)

i 1 mA rms

i 0.5 mA rms

i 0.7 mA peak
i 2 mA dc

i 0.7 mA peak
i 2 mA dc

a, b, c

Exposed accessible parts

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.YF057)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.YF057)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
otherwise specified, tighten screws at a torque of 0.118N

·cm). However, as this is a required value at the time of

(1.2kgf
production, use the value as a measuring stick when
proceeding repair services. (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

MINI BW 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

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

Bit

YTU94088-003

Tweezers

P-895

·m

40

10

• 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)
E.VF UNIT(B/W)

(∗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.

4(S1a), 3(L1a),CN1a

Fig.C1

(S2a),2(S2b),3(S2c)

Fig.C2-1

2(SD1a),
L2,CN2a,b
2(S8),L8,CN8a

Fig.C2-2

POINT

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

NOTE

-

-

NOTE 8

Chip IC replacement jig

PTS40844-2

1-6 (No.YF057)

Cleaning cloth

KSMM-01

Fig.3-1-2

3.2.2 ASSEMBLY/DISASSEMBLY OF CABINET PARTS AND ELECTRICAL PARTS

zDisassembly procedure

STEP

PART NAME

No.

[1]

COVER(PAD)

[2]

COVER(STROBE)

[3]

TOP COVER ASSY

[4]

CASSETTE COVER ASSY

[5]

UPPER CASE ASSY
(INCLUDE MONITOR BOARD)

[6]

FRONT COVER ASSY

[7]

REAR COVER ASSY

[8]

REAR BOARD ASSY

[9]

VF ASSY

[10]

JACK BOARD ASSY
(INCLUDE BASE)

[11]

BKT(TOP)

[12]

ARM ASSY

[13]

SD BOARD ASSY

[14]

FRONT BOARD ASSY

[15]

MAIN BOARD ASSY

[16]

OP BLOCK ASSY

[17]

PRE/MDA BOARD ASSY

[18]

MECHANISM ASSY

Fig.
No.

GRIP BELT,S1,2(L1a),L1b,L1c

C1

COVER(MIC),S2,L2a,L2b

FA1-1

COVER(GRIP),S3a,2(S3b),2(L3a),

FA1-1,2

L3b,L3c,2(L3d),L3e,3(L3f),L3g
CN4,2(S4a),2(S4b),2(S4a)

FA2-1,2

S5a, S5b, GARD BASE,4(S5b),

FA3-1,2

5(S5c),FOOT, S5d,CN5a,CN5b
CN6a,CN6b,2(S6),L6

FA4

2(S7a),S7b

FA5

CN8,2(S8),L8
CN9,S9a,2(S9b)

FA6-1,2

S10,CN10

FA7

3(S11),HEAT ASSY

FA8-1

CN12a,CN12b,2(S12a),4(S12b)

FA8-1,2

3(S13),L13

FA9

S14,2(L14a),L14b
CN15a,CN15b,2(S15),L15a,

FA10

L15b,CN15c,CN15d
CN16,2(S16),L16a,2(L16b)

FA11

2(S17a),SHIELD COVER(PRE),

FA12

L17a,CN17a,CN17b,CN17c,CN17d,
CN17e,CN17f,2(S17b),L17b
3(S18),BKT(MECHA)

FA13

NOTE1a:

Pull out the GRIP BELT from the hook.

NOTE1b:

POINT NOTE

NOTE1a,b
NOTE2a,b

NOTE3

NOTE4a,b
NOTE5a,b

NOTE6
NOTE7
NOTE8
NOTE9

NOTE10

NOTE11

NOTE12a,b

-

-

-

NOTE16
NOTE17

NOTE18

NOTE9:

Be careful in treating and handling the FPC.

NOTE10:

Be careful in treating and handling the FPC.

NOTE11:

Carefully remove the HEAT ASSEMBLY that is placed on the
MAIN BOARD.
When attaching the HEAT ASSEMBLY, pull it into shape and
place it back to it's original position.

NOTE12a:

Detach the ARM ASSEMBLY with the SD BOARD ASSEM­BLY attached.

NOTE12b:

Detach the ARM ASSEMBLY with the FRONT BOARD AS­SEMBLY attached.

NOTE16:

Be careful with the handling of the OP BLOCK ASSEMBLY.

NOTE17:

When attaching the SHIELD COVER, press the FPC with the
SHIELD COVER.

NOTE18:

When attaching the BRACKET (MECHA), make sure to
place the FPC inside the frame.

zDestination of connectors

CN.NO.

Be careful not to lose the COVER (ADJ).

NOTE2a:

Remove the COVER (MIC), and remove the screw.

NOTE2b:

Be careful not to break the hooks.

NOTE3:

Be careful not to break the hooks.

NOTE4a:

Make sure to pull out the SD card from the holder.

NOTE4b:

Remove the screw (No.9) by opening the MEMORY CARD
COVER.

NOTE5a:

Remove the FOOT, and remove the screw (No.23).

NOTE5b:

Be careful not to get an electric shock by the strobe con­denser.

NOTE6:

Be careful not to get an electric shock by the strobe con­denser.

NOTE7:

When attaching/detaching the REAR COVER ASSEMBLY,
leave the CASSETTE COVER open, and the VF ASSEM­BLY pulled out.

CN4 SPEAKER - SD CN704 2

CN5a MAIN CN105 MONITOR

CN5b MAIN CN112 JUNCTION CN901 18

CN6a MAIN CN111 MIC - 4

CN6b MAIN CN110 STROBE UNIT - 16

CN8 MAIN CN104 REAR CN501 40

CN9 MAIN CN103 VF, ZOOM CN7001,CN1

CN10 MAIN CN108 JACK CN301 16

CN12a SD CN701 MAIN CN102 25

CN12b FRONT CN1101 MAIN CN109 6

CN15a MAIN CN101 CCD - 24

CN15b MAIN CN102 SD CN701 25

CN15c PRE/MDA CN402 MAIN CN106 40

CN15d PRE/MDA CN401 MAIN CN107 73

CN16 PRE/MDA CN4901 OP BLOCK ASSY - 33

CN17a PRE/MDA CN408 HEAD - 8

CN17b PRE/MDA CN406 SENSOR - 16

CN17c PRE/MDA CN405 CAPSTAN MOTOR - 18

CN17d PRE/MDA CN404 DRUM MOTOR - 11

CN17e PRE/MDA CN407

CN17f PRE/MDA CN403 LOADING MOTOR - 6

NOTE8:

When attaching the REAR BOARD ASSEMBLY, leave the
CASSETTE COVER closed, and be careful not to break the
switch.

CONNECTOR

ROTARY ENCODER SW

CN7601,CN7602

39/20,20

31/20,6

- 6

PIN
NO.

(No.YF057)1-7

BOTTOM VIEW

2L3d

L3e

L3g

[1]

1

(S1)

L1a

L1c

L1b

Fig.C1

COVER(ADJ)

NOTE1b

GRIP BELT

NOTE1a

L3b

L3d

L3c

2L3f

L3b

[3]

L3c

L3f

NOTE3

L3g

L3e

Fig.FA1-2

L3a

4

(S3b)

[2]

COVER(GRIP)

5

(S3b)

NOTE2b

2

(S2)

L2b

L2a

Fig.FA1-1

[3]

COVER(MIC)

NOTE2a

3

(S3a)

[4]

8

(S4b)

9

(S4b)

NOTE4b

NOTE4a

CN4

10

(S4a)

Fig.FA2-1

6

(S4a)

7

(S4a)

11

(S4a)

1-8 (No.YF057)

[4]

[5]

NOTE5b

CN5b

CN5a

FPC
(MONI)

18

(S5c)

17

17

(S5b)

(S5b)

16

(S5b)

Fig.FA2-2

22

(S5c)

21

(S5c)

20

(S5c)

19

(S5c)

FOOT

NOTE5a

12

(S5a)

14

(S5b)

GARD BASE

13

(S5b)

㧖

15

(S5b)

㧖0.088N࡮m (0.9kgf࡮cm)

Fig.FA3-1

23

(S5d)

NOTE6

[6]

L6

Fig.FA3-2

CN6b

CN6a

24

(S6)

25

(S6)

Fig.FA4

(No.YF057)1-9