JVC CU-VH1US Service Manual

SERVICE MANUAL

DIGITAL HD PLAYER

YF02120042

CU-VH1US

CU-VH1US [M4R8]

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

TABLE OF CONTENTS

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

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

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

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

5 TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-20

COPYRIGHT © 2004 VICTOR COMPANY OF JAPAN, LIMITED

No.YF021

2004/2

SPECIFICATION

1-2 (No.YF021)

SECTION 1

r

e

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 cauti on 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 compon ents (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 insulati on 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 sh ow n in Fi g. 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.YF021)1-3

1.1.2 Safety Check after Servicing

Examine the area surrounding the repaired location for d amage
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 mm

)

d' 8 mm (Power cord
d' 6 mm (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.YF021)

SECTION 2

SPECIFIC SERVICE INSTRUCTIONS

This service manual does not describe SPECIFIC SERVICE INSTRUCTIONS.

(No.YF021)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 0.098N

·cm). However, 0.098N·m (1.0kgf·cm) is a value at the

(1.0kgf
time of production. At the time of service, perform the
procedure at a torque 10% less than 0.098N

·m (1.0kgf·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

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

2

• 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 th e 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.
(∗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

Chip IC replacement jig

PTS40844-2

1-6 (No.YF021)

Cleaning cloth

KSMM-01

Fig.3-1-2

3.2.2 Disassembly/Assembly of CABINET PARTS and
ELECTRICAL PARTS (1)

NOTE :

• During the procedure, see "3.2.4 Wiring" as for wiring con­nection/attachment of main parts.

zDisassembly procedure

STEP

PART NAME

No.

[1]

BOTTOM CASE ASSY

[2]

BATTERY BOARD ASSY
(INCLUDE BATT.CASE UNIT)

[3]

COVER(BOTTOM)

/

[4]

JACK BOARD ASSY

[5]

FRAME ASSY
(INCLUDE ANALOG BOARD
ASSY/DIGITAL BOARD
ASSY/FRONT BOARD ASSY

([4])

/DC-JUNC BOARD ASSY)

[6]

JIG-CONN BOARD ASSY

/

[7]

JIG-JUNC BOARD ASSY

[8]

DIGITAL BOARD ASSY

[9]

USB COVER ASSY

[10]

FRONT BOARD ASSY

[11]

ANALOG BOARD ASSY

[12]

DC-JUNC BOARD ASSY

Fig.
No.

Fig.FA1

COVER(MIC),4(S1a),2(S1b),(S1c),
(S1a),4(S1c)

Fig.FA2

SHIEET,2(S2),CN2a,CN2b

Fig.FA3

3(S3),2(L3)

CN4a,CN4b,CN4c,4(S4a),(S4b),CN4d

Fig.FA4a

CN5a,CN5b,CN5c,CN5d,CN5e,CN5f
CN5g,CN5h,CN5k,SPACER,4(S5),
CN5m,CN5n,CN5p

/Fig.FA4b

CN5q
CN6,3(S6),2(L6)

Fig.FA5

S7,CN7
SHIELD(HEAT SINK),5(S8a),L8a

Fig.FA6a

/Fig.FA6b

HEAT SINK
CN8d,L8b
COVER(USB),3(S9),2(L9)

Fig.FA7

SPACER,5(S10),CN10a,CN10b,CN10c
3(S11),CN11

Fig.FA8

2(S12),2(L12)

Fig.FA9

POINT NOTE

,CN8a,CN8b,4(S8b),CN8c

NOTE1

NOTE2

NOTE4
NOTE5

NOTE9

NOTE10
NOTE11a
NOTE11b
NOTE11c

Fig.3-2-1

NOTE1:

Remove the COVER(MIC) first.

NOTE2:

Remove the SHEET if necessary.

NOTE4:

Remove the JACK BOARD ASSEMBLY without removing
the DV cable.

NOTE5:

Before removing the FPC, remove the SPACER that attach­es the FPC.

NOTE9:

In attaching the USB COVER ASSEMBLY, be careful about
the position of the SWITCH.

NOTE10:

Before removing the FRONT BOARD ASSEMBLY, remove
the SPACER that fixes FPC and wires.

NOTE11a:

Before removing the ANALOG BOARD ASSEMBLY, re­move the FPC that fixes the ANALOG BOARD ASSEMBLY
so that the FPC moves easily.

NOTE11b:

Be careful in handling the CAPACITOR.

NOTE11c:

In removing the ANALOG BOARD ASSEMBLY, be careful
not to cut or damage wires.

zDestination of connectors

CN.NO.

CONNECTOR

PIN
NO.

CN2a BATT CN808 DC-JUNC - 3

CN2b BATT CN807 JACK CN806 6

CN4a JACK CN805 FRONT CN609 10

CN4b JACK CN803 FRONT CN608 6

CN4c JACK CN810 FRONT CN611 8

CN4d JACK CN804 ANALOG CN205 10

CN5a FRONT CN610 EJECT CN801 6

CN5b PREMDA CN415 ANALOG CN213 14

CN5c PREMDA CN410 DIGITAL CN107 22

CN5d PREMDA CN411 DIGITAL CN106 6

CN5e PREMDA CN412 ANALOG CN210 5

CN5f PREMDA CN413 ANALOG CN212 15

-

CN5g PREMDA CN414 ANALOG CN211 20

CN5h PREMDA CN409 MONI/OPE CN307 6

CN5k PREMDA CN401 MONI/OPE CN308 11

-

CN5m MONI/OPE CN303 DIGITAL CN104 18

CN5n MONI/OPE CN301 ANALOG CN209 51

CN5p MONI/OPE CN306 FRONT CN607 11

CN5q DIGITAL CN111 i.LINK - 6

CN6 JIG-CONN CN903 JIG-JUNC CN902 26

CN7 DIGITAL CN110 JIG-JUNC CN901 30

CN8a FRONT CN602 DIGITAL CN109 16

-

CN8b DIGITAL CN105 FRONT CN604 14

CN8c DIGITAL CN108 ANALOG CN208 6

CN8d DIGITAL CN101 ANALOG CN201 150

CN10a FRONT CN603 ANALOG CN215 8

CN10b ANALOG CN207 FRONT CN606 6

CN10c FRONT CN605 ANALOG CN206 10

CN11 ANALOG CN214 DC-JUNC - 6

Fig.3-2-2

(No.YF021)1-7

9

(S1c)

(S1a)

(S1c)

8

(S1c)

10

(S1c)

7

11

(S1b)

(S1c)

5

(S1b)

6

12

NOTE1

4

(S1a)

3

(S1a)

a

(S1a)

[4]

[3]

[1]

15

(S3)

b

2

(S1a)

1

b

a

16

(S3)

L3

17

(S3)

CN4c

NOTE4

CN4b

22

(S4b)

a

(S4a)

18

a

b

b

(S4a)

CN4a

c

19

c

d

20

(S4a)

d

CN4d

21

(S4a)

[2]

CN2a

13

(S2)

b

Fig.FA1

14

(S2)

CN2b

Fig.FA3

NOTE5

SPACER

23

CN5h

CN5k

(S5)

CN5p

a

b

SHEET

NOTE2

a

CN5c

CN5b

[5]

CN5a

CN5g

CN5f

CN5e

24

(S5)

CN5n

25

(S5)

CN5m

26

(S5)

1-8 (No.YF021)

Fig.FA2

CN5d

Fig.FA4a

[5]

CN5q

[4]

31

(S8a)

35

(S8a)

L8a

SHIELD(HEAT SINK)

33

(S8a)

34

(S8a)

32

(S8a)

HEAT SINK

27

(S6)

[6]

(S6)

CN6

28

29

(S6)

Fig.FA4b

L6

[7]

L6

30

(S7)

CN7

CN8d

[8]

L8b

36

(S8b)

CN8c

Fig.FA6a

CN8b

37

(S8b)

CN8a

38

(S8b)

(S8b)

L8b

39

Fig.FA5

Fig.FA6b

(No.YF021)1-9

[9]

L9

NOTE9

[10]

CN10a

NOTE10
SPACER

CN10b

40

(S9)

41

(S9)

NOTE11a

48

(S11)

42

(S9)

49

(S11)

50

(S11)

(S10)

COVER(USB)

NOTE11b

CN11

43

47

(S10)

46

(S10)

44

(S10)

Fig.FA7

45

(S10)

CN10c

NOTE10

Confirm that the CAPACITOR
touches a side of the SPACER.

NOTE11b

Confirm that the bottom side of
CAPACITOR is securely put on
the SPACER.

1-10 (No.YF021)

[11]
NOTE11c

NOTE11a

Fig.FA8

a

L12

51

(S12)

52

(S12)

[12]

Fig.FA9

3.2.3 Disassembly/Assembly of CABINET PARTS and
ELECTRICAL PARTS (2)

NOTE :

• During the procedure, see "3.2.4 Wiring" as for wiring con­nection/attachment of main parts.

zDisassembly procedure

STEP

PART NAME

No.

[1]

MECHANISM ASSY
(INCLUDE PREMDA BOARD ASSY)

[2]

PREMDA

BOARD ASSY

/

BRACKET(MECHA)ASSY

[3]

MONI/OPE

BOARD ASSY

[4]

MONITOR ASSY

[5]

SPEAKER

NOTE1a:

In removing the MECHANISM ASSEMBLY, open the CAS­SETTE COVER and remove the two screws (No. 1 and 2).

NOTE1b:

Be careful in handling the LUG wire.

NOTE3a:

In removing the MONI/OPE BOARD ASSEMBLY, be careful
not to cut the wire (speaker).

NOTE3b:

Be careful in handling the parts.

Fig.
No.

CN1,2(S1a),4(S1b),LUG WIRE

Fig.

TA1-1

CN2a,CN2b,CN2c,CN2d,CN2e,CN2f

Fig.

TA1-2

2(S2a),2(S2b),L2
3(S1c)
(S3a),10(S3b),SHIELD COVER

Fig.

TA2-1

(OPE PWB),2(L3a)
CN3a,2(3Sc),2(L3b),CN3b

/

Fig.

TA2-2

2(S4a),BRACKET(HINGE)(L),2(S4a),

Fig.

TA3-1

BRACKET(HINGE)(R)
2(S4b),4(S4c),LUG WIRE,L4

/

Fig.

TA3-2

(S5),BRACKET(SPEAKER),2(L5)

Fig.

TA4

POINT NOTE

Fig.3-2-3

NOTE1a
NOTE1b

NOTE3a
NOTE3b

NOTE4a
NOTE4b
NOTE4c

NOTE5

NOTE4a:

In removing the MONITOR ASSEMBLY, remove the two
screws (No. 31 and 32) so that the FPC moves easily, re­move the FPC, and remove the four screws (No. 27-30).

NOTE4b:

Be careful in handling the LUG wire.

NOTE4c:

In attaching the MONITOR ASSEMBLY, wind the FPC AS-

-

SEMBLY around the HINGE ASSEMBLY 1.5 times.

NOTE5:

Be careful about the engagement of the wire.

zDestination of connectors

CN.NO.

CONNECTOR

PIN
NO.

CN1 PREMDA CN408 EJECT CN802 8

CN2a PREMDA CN406 SENSOR - 16

CN2b PREMDA CN405 CAPSTAN MOTOR - 18

CN2c PREMDA CN404 DRUM MOTOR - 11

CN2d PREMDA CN402 HEAD - 8

CN2e PREMDA CN403 LOADING MOTOR - 6

CN2f PREMDA CN407

ROTARY ENCODER SW

- 6

CN3a MONI/OPE CN305 SPEAKER - 2

CN3b MONI/OPE CN302 MONI-BL CN701 39/33

Fig.3-2-4

(No.YF021)1-11

(S1b)

NOTE1b

*

6

*

5

(S1b)

CN1

*

4

(S1b)

*

3

(S1b)

[1]

SHIELD(OPE PWB)

(S3b)

15

(S3b)

17

(S3b)

16

19

(S3b)

20

(S3b)

18

(S3b)

(S3b)

23

22

(S3b)

21

(S3b)

(S3b)

24

14

(S3a)

(S1a)

:0.078N࡮m(0.8kgf࡮cm)

*



10

9

(S2b)

(S2b)



7

CN2c

CN2b

(S2a)

*

2

Fig.TA1-1



CN2d

*

1

(S1a)

CASSETTE COVER

NOTE1a

CN2e

CN2f



8

(S2a)

L2

CN3a

NOTE3a

L3a

Fig.TA2-1

[3]

25

(S3c)

26

(S3c)

CN2a



11

(S2c)

1-12 (No.YF021)



13

(S2c)



12

(S2c)

Fig.TA1-2

[2]

BRACKET(MECHA)

[1]

:0.078N࡮m(0.8kgf࡮cm)



KNOB(VIDEO/LCD MON.)

Fig.TA2-2

CN3b

KNOB(VIDEO/MEMORY)

NOTE3b

L3b

(BLACK)

(BLUE)

(S4a)

27

(S4a)

28

29

(S4a)

30

(S4a)

37

(S5)

L5

NOTE5

BRACKET(SPEAKER)

[5]

COVER(HINGE)(L)

[4]

L4

Fig.TA3-1



34

(S4c)



33

(S4c)

NOTE4c

COVER(HINGE)(R)

NOTE4b

LUG WIRE



35

(S4c)



36

(S4c)

Fig.TA4

:0.196N࡮m(2.0kgf࡮cm)



Fig.TA3-2

(S4b)

31

(S4b)

NOTE4a

32

(No.YF021)1-13

3.2.4 Wiring
NOTE :

• When the SPECER, SHEET, and TAPE fix the wires, see
the figures and reattach the wires in proper positions.

• In attaching procedures, be careful to insert them securely
and not to attach the wires forcibly.

• What should be noticed in attaching wires

(1) Be careful about the position to which wires are at-

tached on the bottom side of the FRAME ASSEMBLY
(See fig. WR1)

(2) Be careful about how to pul l out wires connected to

BOARD in the FRAME ASSEMBLY (See fig. WR2 and
WR3).

(3) Be careful about the engagement of the wire in attach-

ing the BOTTOM CASE ASSEMBLY. Be sure to reat­tach wires by using the sheet. (See fig. WR4.)

(4) DC wiring (See fig. WR5.)

㧨Wiring 2㧪

-Connection of SHIELD WIRE-

SPECER

The SHIELD WIRE that connects CN803 of the
JACK BOARD and CN608 of the FRONT BOARD
must come in the lowest position.

㧨Wiring1㧪

-Fixing the wires-

Reattach the wires on double-side adhesive tape so that
wires do not overlap one another.

Fig.WR2

㧨Wiring 3㧪

-Connection of the JACK BOARD-

Connect CN608 of the FRONT
BOARD and CN803 of the
JACK BOARD.

Connect CN611 of the
FRONT BOARD and
CN610 of the JACK
BOARD.

Connect CN205 of the ANALOG BOARD and CN804 of
the JACK BOARD. Attach the JACK BOARD ASSEMBLY
to the TOP ASSEMBLY. Put the slack of the FPC on a
space between the FRAME and the SPACER.

Connect CN609 of
the FRONT BOARD
and CN805 of the
JACK BOARD.

1-14 (No.YF021)

Fig.WR1

Fig.WR3

㧨Wiring 4㧪

-Attaching the BATTERY CASE ASSEMBLY-

Connect CN801 of the EJECT BOARD
and CN609 of the FRONT BOARD.

Draw the wires and the FPC in a direction of the arrow, fix the wires
by using the SHEET so that wires don't go toward the BOSS, and
attach the SHEET on the top of the FRAME. Be careful not to put
the wires on the FRAME.

FRAME

Connect CN806 of the JACK BOARD
to CN807 of the BATT.BOARD.

㧨Wiring 5㧪

-DC Wiring-

BOSS

Fig.WR4

SHEET

After a connection procedure,
put the slack of the wires on
this space.

Be careful not to put the
DC wire on this BOSS.

BOSS

DC WIRE

Put the DC wire on a
space as the figure shows.

Connect the connector of the DC JUNC BOARD
to CN808 of the BATT.BOARD.

Fig.WR5

(No.YF021)1-15

3.2.5 [4]Disassembly of MONITOR ASSEMBLY
NOTE :

(1) During the procedure, be careful in handling the LCD

MODULE,etc., especially not to damage or soil the mon­itor screen. If it is soiled with fingerprints, etc., gently
clean it with chamois or the cleaning cloth.

(2) Since the BACKLIGHT is soldered to the ASSEMBLY

BOARD, the BACKLIGHT should not be separated from
the ASSEMBLY BOARD except when replacing the
BACKLIGHT.

zDisassembly procedure of MONITOR ASSSEMBLY

(1) While removing the ten screws (1-10) in numerical order

and disengaging the four hooks (L4a-L4d) in
alphabetical order, remove the MONITOR COVER
ASSEMBLY.

(2) Unlock one connector CN4, and remove one screw (11).

MONITOR COVER ASSY

L4b

L4c

3

f

*
6

(S4b)

j

9

(S4a)

(S4c)

c

(S4a)

4

d

(S4a)

h

g

k

*

10

(S4a)

13

MON BL BOARD ASSY

n

7

(S4b)

SD4

*
8

(S4b)

1

(S4a)

L4a

a

2

(S4a)

L4d

b

12

(S4c)

m

e

(S4b)

CN4a

*
5

CN4b

BACK LIGHT

(3) Remove the HINGE ASSEMBLY without removing the

FPC ASSEMBLY.

NOTE4:

During the procedure, be careful in handling the F PC
ASSEMBLY and LUG wire.

(4) Remove the FPC of the LCD MODULE from one

connector CN4b.

(5) Remove the two screws (12 an d 13), and remove the

MON-BL BOARD ASSEMBLY together with the

BACKLIGHT.
(6) Remove the DIFF SHEET.
(7) Remove the two screws (14 an d 15), and remove the

BRACKET (M.FRM).
(8) Remove the LCD MODULE.

NOTE4a

LUG WIRE

D.BEFF SHEET

14

(S4b)

p

m

p

a

b

MONITOR CASE ASSY

15

(S4b)

q

q

e

n

f

Rough side faces downward
(a direction of LCD module.)

BRACKET(M.FRM)

HINGE ASSY

LCD MODULE

11

(S4b)

c

d

h

g

k

j

* : 0.196N࡮m(2.0kgf࡮cm)

SD4

Let the LUG wire
pass under the SHAFT.

FPC ASSY
NOTE4a,b

1-16 (No.YF021)

Fig.MO1

SECTION 4

ADJUSTMENT

4.1 PREPARATION

4.1.1 Precaution

Camera system and deck system of this model are specially
adjusted by using PC.
However, if parts such as the following are replaced, an
adjustment is required. The adjus tment must be performed in a
Service Center equipped with the concerned facilities.

• MONITOR ASSEMBLY

• EEP ROM (IC1003 of DIGITAL board)
In the event of malfunction with electrical circuits, first find a

defective portion with the aid of proper test instruments as shown
in the following electrical adjustment procedure, and then
commence necessary repair/ replacement/adjustment.

• In observing chip TP, use IC clips, etc. to avoid any stress.
Prior to replacement of chip parts (especially IC), remove the
solder completely to prevent peeling of the pattern.

• Use a patch cord if necessary. As for a patch cord, see the
BOARD INTERCONNECTIONS.

• Since connectors are fragile, carefully handle them in
disconnecting and connecting the FPC.

4.1.2 REQUIRED TEST EQUIPMENT

• Personal computer (for Windows)

• Color TV monitor

• Oscilloscope (dual-trace type, observable 100MHz or higher
frequency). The one observable 300 MHz or higher frequency
is recommended.

• Digital voltmeter

• DC power supply or AC adapter

• Frequency counter (with threshold level adjuster)

• Communication cable

Connect the Communication cable between the PC cable and
Jig connector cable when performing a PC adjustment.

• Service support system

To be used for adjustment with a p ersonal computer . Software
can be downloaded also from JS-net.

• Jig connector cable

Connected to JIG CONNECTOR of the main board and used
for electrical adjustment, etc.

Torque Driver

YTU94088

Chip IC Replacement Jig

PTS40844-2

Alignment Tape

MC-1

Bit

YTU94088-003

Cleaning Cloth

KSMM-01

PC Cable

QAM0099-002

Tweezers

P-895

Guide Driver (Hexagonal)

D-770-1.27

Communication Cable

YTU93107A

4.1.3 TOOLS REQUIRED FOR ADJUSTMENT

• 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 adjustment of the camera system.

• Cleaning cloth

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

• Guide driver (Hexagonal)

To be used to turn the guide roller to adjustment of the linarity
of playback envelope.

• Alignment tape

To be used for check and adjustment of interchangeability of
the mechanism.

• PC cable

To be used to connect the Videocamera and a personal computer
with each other when a personal computer issued for adjustment.

Service Support System

YTU94057-79

Jig Connector Cable

YTU93082C

(No.YF021)1-17

4.2 Connection of JIG CONNECTOR CABLE NOTE:

• Remove the two screws (1 and 2), and remove the COV­ER(ADJ).

• Remove one screw (3), and remove the COVER(JIG).

In the case of jig connector cable use, since you cannot per­form supply from DC jack, use a battery terminal.

 Connection procedure

GUIDE ROLLER (SUP)

1

2

COVER
(ADJ)

GUIDE ROLLER (TU)

JIG CONNECTOR

COVER (JIG)

3

JIG CONNECTOR CABLE

SERVICE SUPPORT SYSTEM

 Jig connector diagrams

JIG CONNECTOR CABLE (YTU93082C)

JIG-CONN CN904

VPPC

REG_3V

SRV_TX

CJIG_RST

IF_TX

FlashWrt

FS_PLL

ATFI

MAIN_VCO

ENV_OUT

PB_CLK

HID1
GND

JLIP_TX
JLIP_RX
TX_DSC
RX_DSC
SRV_RX

VPPD

AL_3VSYS

DRST

DISCRI

GND

SBE
SPA

TRST

TCK
TMS
TDO

TDI

1

16

2

17

3

18

4

19

5

20

6

21

7

22

8

23

9

24

10

25

11

26

12

27

13

28

14

29

15

30

JIG BOARD ASSY (14PIN)

­REG_3V
CJIG_RST
IF_TX
FlashWrt
FS_PLL
ATFI
MAIN_VCO
ENV_OUT
PB_CLK
HID1
GND
JLIP_TX
VPPD

1
2
3
4
5
6
7
8

9
10
11
12
13
14

JIG BOARD ASSY (15PIN)

JLIP_RX
TX_DSC
RX_DSC
SRV_RX
AL_3VSYS
DRST
DISCRI
GND
SBE
SPA
TRST
TCK
TMS
TDO
TDI

1
2
3
4
5
6
7
8

9
10
11
12
13
14
15

TO JLIP_RX

TO JLIP_TX

TO GND

COMMUNICATION CABLE

FOR
COMMUNICATION CABLE

COMMUNICATION CABLEJIG CONNECTOR OSCILLOSCOPEJIG CONNECTOR

RED

WHITE

BLACK

Fig.4-2-1

PC CABLE

TO ENV_OUT

RS232C
COM PORT

PERSONAL COMPUTER

TO HID1

MENU

Fig.4-2-2

1-18 (No.YF021)

4.3 MECHANISM COMPATIBILITY ADJUSTMENT

4.3.1 Tape pattern adjustment
NOTE:

Prior to the adjustment, remove the COVER (ADJ).
(1) Play back the compatibility adjustment tape.
(2) While triggering the HID1, observe the waveform of

ENV_OUT.
(3) Set the manual tracking mode (ATF OF F).
(4) Confirm that the waveform is entire ly parallel and straig ht,

and free from remarkable level-down, through the tracking

operation.

Make the confirmation as follows if necessary.
(5) If level-down is observed on the left hand side of the

waveform, straighten the level by turning the GUIDE

ROLLER (SUP).

If level-down is observed on the right hand side of the

waveform, straighten the

level by turning the GUIDE ROLLER (TU).
(6) After the adjustment, try the unl oading motion once, and

confirm that the waveform is flat when the tape has been

played back again.
(7) Play back the self-recordin g.
(8) Confirm that the waveform is flat.

4.4 ELECTRICAL ADJUSTMENT

Electrical adjustment is performed by using a personal computer
and software for SERVICE SUPPORT SYSTEM. Read
README.TXT file to use the software properly.
As for the connection of cables, see "4.2 Connection of JIG
CONNECTOR CABLE".

ENV_OUT

HID1

Misalignment of guide
roller height on the
supply side

Fig.4-3-1

Flatten the waveform.

Misalignment of guide roller
height on the take-up side

Fig.4-3-2

(No.YF021)1-19

5.1 SERVICE NOTE

SECTION 5

TROUBLESHOOTING

㪲㪊㪴 㪲㪋㪴

㪲㪉㪴

㪲㪌㪴

㪲㪐㪴

㪲㪏㪴㪲㪌㪴

㪝㪘㪉 㪝㪘㪊

㸇

㪝㪘㪎

㪲㪋㪴㪲㪊㪴

㸈

㪝㪘㪍㪹㪝㪘㪍㪸

㪲㪈㪴 㪲㪉㪴

CABINET PARTS AND ELECTRICAL PARTS(2)

㪫㪘㪈㪄㪈 㪫㪘㪈㪄㪉

㪈 㪉 㪊 㪋 㪌 㪍 㪎 㪏 㪐 㪈㪇 㪈㪈 㪈㪉 㪈㪊

㪫㪘㪋

㪫㪘㪊㪄㪉

㪫㪘㪉㪄㪉㪫㪘㪉㪄㪈 㪫㪘㪊㪄㪈

㸇

㸉㸇

1-20 (No.YF021)

㪲㪎㪴

㪲㪍㪴

㪲㪈㪴

CABINET PARTS AND ELECTRICAL PARTS(1)

Symbol No.

㪝㪘㪈

㪲㪌㪴㪆㪲㪋㪴

㪈 㪉 㪊 㪋 㪌 㪍 㪎 㪏 㪐 㪈㪇 㪈㪈 㪈㪉 㪈㪊 㪈㪋 㪈㪌 㪈㪍 㪈㪎 㪈㪏 㪈㪐 㪉㪇 㪉㪈 㪉㪉

Place to stick screw

Removing order of screw

Reference drawing (Fig.No.)

CABINET PARTS AND ELECTRICAL PARTS(1)

Symbol No.

Screw tightening torque

Removing order of screw

㪄

㪄

㪝㪘㪋㪹

㸇㸇

㪝㪘㪋㪸 㪝㪘㪌

㪉㪊㪉㪋㪉㪌㪉㪍 㪄 㪉㪎㪉㪏㪉㪐㪊㪇㪊㪈㪊㪉㪊㪊㪊㪋㪊㪌㪊㪍㪊㪎㪊㪏㪊㪐㪋㪇㪋㪈㪋㪉

Place to stick screw

Screw tightening torque

Reference drawing (Fig.No.)

㪲㪈㪈㪴 㪲㪈㪉㪴

㪲㪈㪇㪴

CABINET PARTS AND ELECTRICAL PARTS(1)

Symbol No.

㪝㪘㪏 㪝㪘㪐

㸇

㪝㪘㪎

㪋㪊 㪋㪋 㪋㪌 㪋㪍 㪋㪎 㪋㪏 㪋㪐 㪌㪇 㪌㪈 㪌㪉

Place to stick screw

Removing order of screw

CABINET PARTS AND ELECTRICAL PARTS(2)

Symbol No.

Screw tightening torque

Reference drawing (Fig.No.)

MONITOR ASSEMBLY

㪈㪋 㪈㪌 㪈㪍 㪈㪎 㪈㪏 㪈㪐 㪉㪇 㪉㪈 㪉㪉 㪉㪊 㪉㪋 㪉㪌 㪉㪍 㪉㪎 㪉㪏 㪉㪐 㪊㪇 㪊㪈 㪊㪉 㪊㪊 㪊㪋 㪊㪌 㪊㪍 㪊㪎

Place to stick screw

Removing order of screw

Screw tightening torque

Reference drawing (Fig.No.)

㪤㪦㪈

㪁㪁㪁㪁

㸇㸉 㸇

㪈 㪉 㪊 㪋 㪌 㪍 㪎 㪏 㪐 㪈㪇 㪈㪈 㪈㪉 㪈㪊 㪈㪋

Place to stick screw

Removing order of screw

Screw tightening torque

Reference drawing (Fig.No.)

1) * : Don't reuse the screw, because screw lock bond was applied to them.

NOTE:

2) Pay careful attention to tightening torque for each screw.

ޓΣ㧦 0.098N㨯m (1.0kgf࡮cm) Τ㧦 0.078N䍃m(0.8kgf࡮cm) Υ㧦 0.196N䍃m (2.0kgf࡮cm)

5.2 Removing the tape

The following procedure is a method for taking out the cassette
tape in case the cassette tape cannot be ejected due to an elec­trical failure. The following procedure is a simplified method;
therefore, for more reliable operation, it is recommended that you
should remove exterior parts so that you can take out the tape
without excessive force.

(1) Remove the Power Unit (battery or DC code) from the set.
(2) Open the CASSETTE COVER till it is completely opened

and fixed.
(3) Attach a PVC tape as shown in the figure.

NOTE:

Be careful of cassette tape damage caused because the
Cassette Housing Assembly is moved upward at the un­loading end (Eject mode).

(4) To set the Slide Deck Assembly to the un loading end , ap-

ply DC 3V to the electrode (terminal) on the top surface of

the LOADING MOTOR.

NOTE:

Be careful not to attach grease or a similar substance to
the surface of the cassette tape on the tape transport
system.

(5) Wind the cassette tape by directly turning the Reel Disk As-

sembly (SUP) from the backside of the SLIDE DECK AS-

SEMBLY by using a sharp tool (Chip IC replacement tool).
(6) Confirm that the cassette tape is completely woun d, and

then peel off the PVC tape from the CASSETTE HOUSING

ASSEMBLY and take out the cassette tape.

NOTE:

To confirm that the cassette tape is completely wound,
confirm that one REEL DISK ASSEMBLY (TU) rotates
as you rotate the other REEL DISK ASSEMBLY (SUP).

(7) Make sure that grease or a similar substance is not at-

tached to the surface of the tape taken out in the procedure

(6). Similarly, also make sure that grease or a similar sub-

stance is not attached on the Mechanism assembly, espe-

cially the tape transport system.

(DC3V)

PVC TAPE

LOADING MOTOR
ASSEMBLY

REEL DISK ASSEMBLY (SUP)

SLIDE DECK
ASSEMBLY

CASSETTE COVER

CASEETTE HOUSING
ASSEMBLY

Fig.5-2-1

(No.YF021)1-21

5.3 EMERGENCY DISPLAY

Example (in case of the error number E01):

Whenever some abnormal signal is input to the syscon CPU, an
error number (E01, as an example) is displayed on the LCD
monitor or (in the electronic view finder).In every error status,
such the message as shown below alter nately appear over and

E01
UNIT IN
SAFEGUARD MODE

E01
REMOVE AND
REATTACH BATTERY

over.

• In an emergency mode, all operations except turning on/off the
POWER switch are ineffectual.

LCD display Emergencymode Details Possible cause

E01 LOADING In the case the encoder position is

not shifted to the next point though
the loading motor has rotated in the
loading direction for 4 seconds or
more. This error is defined as [E01].

E02 UNLOADING In the case the encoder position is

not shifted to the next point though
the loading motor has rotated in the
unloading direction for 4 seconds or

1. The mechanism is locked during mode shift.

2. The mechanism is locked at the mechanism loading end,
because the encoder position is skipped during
mechanism mode shift.

3. No power is supplied to the loading MDA.

1. The mechanism is locked during mode shift.

2. The mechanism is locked at the mechanism loading end,
because the encoder position is skipped during
mechanism mode shift.

more. This error is defined as [E02].

E03 TU & SUP REEL FG In the case no REEL FG is

produced for seconds shown in the
table below or more in the capstan
rotation mode after loading was
complete, the mechanism mode is
shifted to STOP with the pinch roller
set off. This error is defined as
[E03].However, no REEL EMG is
detected in the SLW/STILL mode.

REEL(SUP) REEL(TU)

PB/REC
S-FWD
S-REW
FF
REW

3 SEC
3 SEC

0.3 SEC
3 SEC

0.1 SEC

3 SEC

0.3 SEC
3 SEC

0.1 SEC
3 SEC

E04 DRUM FG In the case there is no DRUM FG

input in the drum rotation mode for
4 seconds or more. This error is
defined as [E04], and the
mechanism mode is shifted to
STOP with the pinch roller set off.

1. The idler gear does not engage with the reel disk well.

2. Though the idler gear and reel disk are engaged with
each other, the tape is not wound because of overload
to the mechanism.

3. No FG pulse is output from the reel sensor.

4. No power is supplied to the reel sensor.

5. Tape transport operation takes place with a cassette
having no tape inside.

6. The tape slackens and no pulse is produced until the
slack is taken up and the tape comes into the normal
status.

1. The drum cannot be started or drum rotation is stopped
because tape transport load is too high.

1) Tape tension is extremely high.

2) The tape is damaged or soiled with grease, etc.

2. The DRUM FG signal is not received by the syscon CPU.

1) Disconnection in the middle of the signal line.

2) Failure of the DRUM FG pulse generator (hall

element).

3. No drum control voltage is supplied to the MDA.

4. No power is supplied to the DRUM MDA.

E05 - - ­E06 CAPSTAN FG In the case no CAPSTAN FG is

produced in the capstan rotation
mode for 2 seconds or more. This
error is defined as [E06], and the
mechanism mode is shifted to
STOP with the pinch roller set
off.However, no CAPSTAN EMG is
detected in the STILL/FF/REW
mode.

1. The CAPSTAN FG signal is not received by the syscon
CPU.

1) Disconnection in the middle of the signal line.

2) Failure of the CAPSTAN FG pulse generator (MR

element).

2. No capstan control voltage is supplied to the MDA.

3. The capstan cannot be started or capstan rotation is
stopped because tape transport load is too high.

1) Tape tension is extremely high. (Mechanical locking)

2) The tape is damaged or soiled with grease, etc. (Tape

tangling occurs, etc.)

1-22 (No.YF021)

Fig.5-3-1

JVC SERVICE & ENGINEERING COMPANY OF AMERICA

DIVISION OF JVC AMERICAS CORP.

www.jvcservice.com(US Only)

JVC CANADA INC.

Head office : 21 Finchdene Square Scarborough, Ontario M1X 1A7 [phone]

(No.YF021)

Printed in Japan

WPC