JVC GR-AX970UM Service Manual

SERVICE MANUAL

COMPACT VHS CAMCORDER

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

:

[phone]
[phone]
[phone]
[phone]
[phone]
[phone]

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

[phone]
[phone]
[phone]

S40895-04

GR-AX770U/AX970U

SPECIFICATIONS

General

Format : VHS NTSC standard
Power source : DC 11 V (Using AC Adapter)

Power consumption

Viewfinder on : 3.7 W
Signal system : NTSC-type
Video recording system

Luminance : FM recording

Color : Converted sub-carrier direct recording

Cassette : cassette
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

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. 850 g (1.9 lbs)

No. 86663

Dimensions : 200 mm x 112 mm x 115 mm

(W x H x D) (7-7/8" x 4-7/16" x 4-9/16")
Pickup : 1/4" format CCD
Lens : F1.6, f = 3.9 mm to 62.4 mm,

Viewfinder : Electronic viewfinder with 0.5" black/white CRT
White balance

adjustment : Auto/Manual adjustment

GR-AX770U/AX970U

(The specifications shown pertain specifically to the model GR-AX770)

Camcorder

DC 6 V (Using battery pack)

Conforms to VHS standard

(with TC-40 cassette)

16:1 power zoom lens with auto iris and macro control,
filter diameter 40.5 mm

Connectors

Video : 1 V (p-p), 75 Ø unbalanced, analog output (via

Audio : 300 mV (rms), 1 kØ analog output

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

Optional Accessories

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

• A/V (Audio/Video) Cable

• Compact VHS ( ) Cassettes TC-40/30/20

• Active Carrying Bag CB-V7U

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.

Video output connector)

(via Audio output connector)

AC Adapter

Printed in Japan

This service manual is printed on 100% recycled paper.

COPYRIGHT © 2002 VICTOR COMPANY OF JAPAN, LTD.

No. 86663

January 2002

TABLE OF CONTENTS

Section Title Page 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 3 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 assembly .......................... 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 SERVICE CAUTIONS ............................................................ 2-1

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

2.1.2 How to read the disassembly and assembly

(For Mechanism Parts) .................................................... 2-1

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

2.2 DISASSEMBLY/ASSEMBLY OF MECHANISM PARTS ........ 2-2

2.3 CHECKUP AND ADJUSTMENT OF MECHANISM PHASE .. 2-6

2.4 TAPE TRANSPORT ADJUSTMENT ...................................... 2-7

2.4.1 Back tension .................................................................... 2-7

2.4.2 Tape pattern ..................................................................... 2-7

2.4.3 A/C head height & azimuth .............................................. 2-8

2.4.4 Phase of control head (X value) ....................................... 2-9

2.5 REMARKS ............................................................................ 2-9

2.5.1 Cleaning ........................................................................... 2-9

2.5.2 Applying oil and grease ................................................... 2-9

2.5.3 Checkup .......................................................................... 2-9

2.6 JIG CONNECTOR CABLE CONNECTION .......................... 2-10

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 M. MDA SCHEMATIC DIAGRAM ......................................... 4-7

4.4 VTR ASP SCHEMATIC DIAGRAM....................................... 4-9

4.5 DSP SCHEMATIC DIAGRAM............................................. 4-11

4.6 F/Z/I/MDA SCHEMATIC DIAGRAM .................................... 4-13

4.7 V OUT SCHEMATIC DIAGRAM ......................................... 4-15

4.8 TG/CDS SCHEMATIC DIAGRAM ...................................... 4-17

4.9 REG SCHEMATIC DIAGRAM ............................................ 4-19

4.10 LCD/CVF SCHEMATIC DIAGRAM [GR-AX970U] ........... 4-21

4.11 BW/CVF SCHEMATIC DIAGRAM [GR-AX770UC] .......... 4-23

4.12 BW/CVF SCHEMATIC DIAGRAM [GR-AX970U] ............ 4-25

4.13 JACK SCHEMATIC DIAGRAM ........................................ 4-27

4.14 CCD SCHEMATIC DIAGRAM .......................................... 4-29

4.15 C-VF BL SCHEMATIC DIAGRAM [GR-AX970U] ............. 4-30

4.16 C-VF SHEMATIC DIAGRAM [GR-AX970U] ..................... 4-31

4.17 E.VF SCHEMATIC DIAGRAM [GR-AX770UC] ................ 4-33

4.18 TOP OPE UNIT, ZOOM UNIT, REAR UNIT AND SENSOR

SCHEMATIC DIAGRAMS ................................................ 4-35

4.19 MAIN CIRCUIT BOARD................................................... 4-37

4.20 CCD CIRCUIT BOARD .................................................... 4-43

4.21 E. VF CIRCUIT BOARD [GR-AX770UC] ......................... 4-44

4.22 C-VF CIRCUIT BOARD [GR-AX970U] ............................ 4-45

4.23 WAVEFORMS .................................................................. 4-46

4.24 VOLTAGE CHARTS ......................................................... 4-47

4.25 POWER SYSTEM BLOCK DIAGRAM............................. 4-51

4.26 CAMERA AND Y/C SYSTEM BLOCK DIAGRAM ........... 4-53

4.27 CPU/MDA SYSTEM BLOCK DIAGRAM.......................... 4-57

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> [GR-AX770UC] ...

5.4

ELECTRONIC VIEWFINDER ASSEMBLY <M4> [GR-AX970U] .....

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

MAIN BOARD ASSEMBLY <01> ..................................................

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

C-VF BL BOARD ASSEMBLY <06>[AX970U] .................... 5-16

E.VF BOARD ASSEMBLY <60>[AX770UC] ....................... 5-16

5-8
5-9

5-10

3. ELECTRICAL ADJUSTMENT

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

3.1.1 Preparation ...................................................................... 3-1

3.2 ELECTRONIC VIEWFINDER (E. VF) ADJUSTMENT

[B/W VF model only] ............................................................... 3-2

3.2.1 Tilt .................................................................................... 3-2

3.2.2 Centering ......................................................................... 3-2

3.2.3 Vertical scanning .............................................................. 3-2

3.2.4 Brightness ....................................................................... 3-2

3.2.5 Focus ............................................................................... 3-2

The following table lists the differing points between Models GR-AX770U and GR-AX970U in this serise.

GR-AX770U GR-AX970U

E.VF B/W COLOR

DC LIGHT NOT USED USED

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.

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 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.

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 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).

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.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.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 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.

Fig.4

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

wires fully into the connector.

Metal sleeve

Connector

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.

1

.2

5

2

.0

5

.5

Fig.6

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

Not easily pulled free

Wire insulation recessed

more than 4 mm

Fig.7

Crimping tool

Crimped at approx. center

of metal sleeve

Conductors extended

I

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 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’) be­tween soldered terminals, and between terminals and surrounding metallic parts. See table 1
below.

Fig. 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 figure 9 and following
table 2.

Externally
exposed
accessible part

Fig. 9

Z

V

ab

A

c

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

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.

II

S40888-01

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

(For Cabinet Parts)

REMOVAL

STEP

No.

1

2
3

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

PART

CASETTE COVER C1 (S1), 3(L1a), (L1b), (L1c),
ASSEMBLY Push button, Spring

UPPER CASE C2 2(S2), 2(L2)
LOWER CASE C3 9(S3), (L3a), (L3b), CN3a,

ASSEMBLY COVER(JACK)
(Incl. E.VF ASSEMBLY)

Fig.

No.

*UNLOCK/RELEASE/
UNPLUG/UNCLAMP/

UNSOLDER

(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, un-

locked, released, unplugged, unclamped or unsoldered.

P = Spring

W = Washer

S = Screw

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

2(S3) = 2 Screws (S3)

CN = Connector

1.1.3 Connection of the wires

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

Wire

Connector

Fig. 1-1-1

Extend the locks in the direction of the arrow for unlocking
and then pull out the wire.

Wire

Connector

NOTE:

After removing the wire, return the stopper to
its original position, because it is apt to come
off if it is left open.

Fig. 1-1-2

1-1

1.2 TOOLS REQUIRED FOR ADJUSTMENTS

Alignment tape

(for SP interchangeability)

1

MHP-C

Alignment tape

(for N. SP PB Y/C level)

2

MHV-2C

Service support system

YTU94057-56

1615

PC cable

QAM0099-002

3

5

78

910

Torque driver

YTU94088

INF adjustment lens

YTU92001B

Gray Scale Chart

YTU94133A

INF lens holder

YTU94087

4

6

Light box Assembly

Bit

YTU94088-003

Conn. ring

YTU92001-111

Color Bar Chart

YTU94133C

YTU93096A

17

Cleaning cloth

KSMM-01

Table 1-2-1

11 12

13

Camera stand

YTU93079

Jig connector cable

YTU93106A

1-2

Extension connector

YTU94145B-30

Communication cable

14

YTU93107A

1,2. Alignment tape

To be used for check and adjustment of interchange­ability of the mechanism.
(Video: Color bar signal, Audio: Non-signal)

3. Torque driver

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

4. Bit

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

1.3 DISASSEMBLY/ASSEMBLY OF CABINET PARTS

1.3.1 Disassembly flow chart

This flowchart indicates the disassembly step for the cabi­net parts and board assembly in order to gain access to
item(s) to be serviced. When reassembling, perform the
step(s) in reverse order. Bend, route and dress the flat ca­bles as they were originally.

1

2

Cassette cover assembly

Upper case

5. INF adjustment lens

To be used for adjustment of the camera system.

6. Conn. ring

The connector ring to attach the INF. lens to the head
of the OP lens.

7. Gray scale chart

To be used for adjustment of the camera system.

8. Color bar chart

To be used for adjustment of the camera system.

9. INF lens holder

To be used together with the camera stand (11) for op­erating the VideoMovie in the stripped-down condition
such as the status without the exterior parts or for us­ing commodities that are not yet conformable to the in­terchangeable ring.

10. Light box assembly

To be used for adjustment of the camera system.

11. Camera stand

To be used together with the INF adjustment lens
holder.

12. Extention connector

To be used to JIG connector cable

13. JIG connector cable

Connected to CN25 of the main board and used for
measuring error rates, etc.

Lower case assembly

3

4

5

6

7

8

9

0

!

Note :

For screw management, refer to the table appearing
in the section “1.9 SERVICE NOTE” (page 1-14).

(Incl. E.VF assembly)

E.VF assembly

Top operation unit

Rear unit

Front cover assembly

(Incl. Microphone / Cover(light) )

Microphone

Cover(light)

Upper Cover(s) assembly

Front frame assembly

14. Communication Cable

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

15. Service support system

To be used for adjustment with a personal computer.

16. PC cable

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

17. Cleaning cloth

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

1-3

1.3.2 Disassembly method

STEP

/LOC

No.

1

2
3

4
5

6
7

8
9

0

!

PART

CASETTE COVER C1 (S1), 3(L1a), (L1b), (L1c),
ASSEMBLY Push button, Spring

UPPER CASE C2 2(S2), 2(L2)
LOWER CASE C3 9(S3), (L3a), (L3b), CN3a,

ASSEMBLY COVER(JACK)
(Incl. E.VF ASSEMBLY)

E.VF ASSEMBLY C4 3(S4)
TOP OPERATION C5 2(S5),(L5a),(L5b),2(L5c),

UNIT *CN5a
REAR UNIT C6 3(S6),(L6a),(L6b),*CN6a
FRONT COVER C7 2(S7a),(S7b),(L7a),(L7b),

ASSEMBLY *CN7a
(Incl. MICROPHONE /
COVER (LIGHT) )

MICROPHONE (S7a)
COVER (LIGHT) / 2(L7c)

DC LIGHT
UPPER COVER(S) C8 2(S8a),(S8b)

ASSEMBLY
FRONT FRAME C9 2(S9)

ASSEMBLY

Fig.
No.

List of Abbreviations:

2(S1)=2 screws (S1)
4(L1a)=4 Locking Tabs
CN=Connector

REMOVAL

*UNLOCK/RELEASE/
UNPLUG/UNCLAMP/

UNSOLDER

(L1b)

(L1a)

(L1c)

Spring

Push button

1

(S1)

1

Reference Notes:
<NOTE 1>
Destination of connectors

Note :

Two kinds of double-arrows in connection tables
respectively show kinds of connector/wires.

⇔ : Flat wire

←→ : Wire

Con-

No.of

nector

CN3a

CN5a 12 TOP OPERATION UNIT ⇔ MAIN CN18

CN6a 13 REAR UNIT ⇔ MAIN CN28

CN7a 2 MIC ←→ MAIN CN8

Pins

3 E.VF (B/W) ←→ MAIN CN12

20 C-VF CN7701 / C-VF BL CN7801 ⇔ MAIN CN11

Connector

<NOTE 2, 3>
(1) The FPC assembly should be winded around the hinge

assembly by two and half turns so that the wire to be
connected to the monitor board assembly is posi­tioned inside.

(2) The upper and lower hinge covers should be mounted

so carefully the any wire is not caught into either of the
covers.

2

(S2)

(L2)

(S2)

Fig. C1

2

3

1-4

Fig. C2

(S )

5

3

(S )

6

3

(S )

(S )

7

3

8

3

COVER

(JACK)

4

3

(S )

12

(S )

(L b)

(S )

3

3

CN a

3

(L a)

3

9

3

11

3

(S )

(S )

3

10

3

Fig. C3

(L5c)

5

15

4

(S )

13

4

(S )

14

4

(S )

17

(S5)

16

(S5)

(L5a)

(L5b)

4

Fig. C4

CN5a

Fig. C5

1-5

CN6a

(L6b)

19

(S6)

18

(S6)

6

(L6a)

20

(S6)

Fig. C6

For DC LIGHT
MODEL ONLY

(L7c)

9

21

(L7a)

(S7a)

7

22

(S7a)

24

(S7a)

CN7a

(L7c)

9

(L7b)

23

(S7b)

8

1-6

Fig. C7

: 0.098N·m (1.0kgf·cm)

Fig. C8

10

25

(S8a)

26

(S8a)

27

(S8b)

: 0.098N·m (1.0kgf·cm)

Fig. C9

28

(S9)

11

29

(S9)

1-7

1.4 DISASSEMBLY/ASSEMBLY OF CAMERA SECTION AND DECK SECTION

1.4.1 Flowchart of disassembly

The following flowchart shows the disassembly of the cam­era section and deck section. When assembly of the cam­era section and deck section, follow this flowchart in the re­verse order.

<Camera section/Deck section>

1

2

3

4

5

Zoom unit assembly

7

Main board assembly

OP block assembly

7

(Incl. CCD board assembly)

3

3

For details of disassembly
manner, refer to page 1-10,
“1.5 REPLACEMENT OF

Frame assembly

7

7

Cassette housing assembly

CCD IMAGE SENSOR.”

7

OP block assembly

7

CCD board assembly

Reference Notes:
<NOTE 1>
Destination of connectors

Note :

Two kinds of double-arrows in connection tables
respectively show kinds of connector/wires.

⇔ : Flat wire

←→ : Wire

Con-

nector

No.of

Pins

CN1a 14 MAIN CN13 ⇔ ZOOM UNIT

CN2a 14 MAIN CN2 ⇔ SENSOR

CN2b 11 MAIN CN5 ⇔ VIDEO/FLY. E HEAD

CN2c 10 MAIN CN1 ⇔ DRUM MOTOR

CN2d 2 MAIN CN4 ←→ LOADING MOTOR

CN2e 2 MAIN CN6 ←→

CN2f 22 MAIN CN15 ⇔ OP BLOCK

CN2g 14 MAIN CN22 ⇔ CCD

CN2h 11 MAIN CN7 ⇔ A/C HEAD

CN2i 18 MAIN CN3 ⇔ CAPSTAN MOTOR

Connector

DC LIGHT (For DC LIGHT
MODEL ONLY)

1.4.2 Disassembly method

STEP

/LOC

No.

1

2

3

4
5

PART

ZOOM UNIT D1 4(S1),(L1a),*CN1a
ASSEMBLY

MAIN BOARD D2 2(S2),(L2a)

OP BLOCK D3 2(S3),CUSHON (OP)
ASSEMBLY
(Incl. CCD BOARD
ASSEMBLY)

FRAME ASSEMBLY D4 2(S4a),2(S4b),(S4c)

CASSETTE HOUSING
ASSEMBLY

Fig.
No.

*CN2a,*CN2b,*CN2c,CN2d,
CN2e,*CN2f,*CN2g,*CN2h,*CN2j

D5 4(S5)

List of Abbreviations:

2(S1)=2 screws (S1)
4(L1a)=4 Locking Tabs (L1a)
CN=Connector

REMOVAL

*UNLOCK/RELEASE/
UNPLUG/UNCLAMP/

UNSOLDER

1

1

(S )

2

(S )

4

1

(S )

1

(L a)

1

CN a

1

1

3

1

(S )

1-8

Fig. D1

5

2

(S )

CN a

(S )

2

6

2

2

CN b

2

CN j

2

CN c

CN h

CN e

2

SHIELD CASE

(MAIN)

9

4

(S a)

2

2

(L a)

2

2

CN f

2

CN d

CN g

2

10

4

(S a)

: 0.108 N•m (1.1 kgf•cm)

∗

Fig. D2 Fig. D4

11

∗

4

(S b)

4

∗

(S b)

13

4

(S c)

12

4

∗

∗

16

(S )

5

5

14

5

(S )

∗

15

5

(S )

3

∗

17

5

(S )

8

3

(S )

7

3

(S )

CUSHION (OP)

Fig. D3

Fig. D5

: 0.216 N•m (2.2 kgf•cm)

∗

1-9

1.5 REPLACEMENT OF 3 CCD IMAGE SENSOR

Notes:

•

Pay the most careful attention to the transparent glass and
optical LPF of the CCD image sensor so a not the soil and
damage them. If something is soiled with finger-prints, etc.,
gently clean it with silicon-processed paper/cloth or cham­ois.

•

When the CCD image sensor is shipped from the factory,
there are protection seals applied onto the transparent
glass. Leave the protector as it is, and take it off just be­fore assembling the CCD image sensor to the OP block.

1.5.1 Removal of CCD image sensor

1. Remove two screws (S1a) securing the CCD base assy,

and disassemble the CCD spacer, the optical LPF,
spacer rubber.

1.5.2 Installation of new CCD image sensor

1. Remove the protection seal from a new CCD image sen-

sor. Next, put the optical LPF, spacer rubber, CCD
spacer on the CCD image sensor as they are piled up
in this order. At that time, make sure of orientation of each
item refering to the following table (see Fig. 1-5-1).

Part Name Orientation

CCD image sensor Mark is on the right viewed as indi-

cated by the arrow a .

Spacer rubber IC side is horizontal.

Optical LPF Marks are on the left and bottom

viewed as indicated by the arrow
a .

2. Fix the CCD base assembly to OP block with the two

screws (S1a) . At that time, be careful of the orienta­tion.

3. After completion of all P.C. boards to the camera sec­tion, observe the monitor to confirm no vignetting caused
by the bodytube, rings, lens hood, etc. If no vignetting
is observed, it can be said that image's parallel,
horizontality and centering are correct.

1.5.3 Replacement of CCD board assembly

1. Remove one screw (S1b).

2. Unsolder at the fourteen points on the CCD board as­sembly.

Notes:

•

Remove the screw (S1b) only when the CCD board as­sembly needs replacement.

•

When installing a new CCD board assembly, carry out the
above-mentioned procedure in the reverse order.

OPTICAL LPF

BLUE

OP

SIDE

CCD

SIDE

1

1

(S a)

CCD BASE ASSEMBLY

CCD SPACER

SPACER RUBBER

2

1

(S a)

a

3

∗

1

(S b)

CCD BOARD

ASSEMBLY

1-10

Fig. 1-5-1

: 0.147 N•m (1.5 kgf•cm)

∗

1.6 TAKE OUT CASSETTE TAPE

In the event that the set enters the emergency mode as it
is loaded with a cassette tape and the cassette tape can­not be ejected with the EJECT button, manually, take it out
of the set according to the following procedure.

Note:

If the mechanism comes into the unloading mode as the

•

cassette tape is not held by hand, it results in tape dam­age.

1. Disconnect the set from the power source.

2. Remove the cassette cover assembly, Upper case,
Lower case assembly, Top operation unit, Front cover
assembly (See Fig. C1, C2, C3, C5 and C7, Pages 1-4
to 1-6).

3. Connect a jumper wire to each pole of the loading mo­tor as shown by the magnified view (Fig. 1-6-1)

4. While holding down the cassette housing by hand, con­nect the jumper wires to a battery to run the mechanism
to the EJECT position four unloading. If this unloading
operation is performed as the cassette housing is not
held down by hand, the front lid of the cassette may
damage the tape when it is ejected.

5. For taking in the slack of the tape, run the mechanism
to the EJECT position as the front lid of the cassette is
left open, and turn the take-up gear in the forward di­rection to wind up the tape. After confirming that the tape
has completely been wound up and the supply reel is
idling, take the cassette tape out of the cassette hous­ing.

BATTERY

MAGNIFIED VIEW

TOP VIEW

b

TAKE-UP GEAR

Fig. 1-6-1

1-11

1.7 EMERGENCY DISPLAY

R
D

N

E
.

ECXZT

M
O

S

O
O

Y

D
M

SETEM ME

S
5

N

P
0

U

x

F
E
M

T

O
X

.

O

C
P
W

U
O
.

S

S
S
B

C

Y

U
.

A

S

R

M

T

E

EERMAMMEE

N

A
A
A

N

U

U
U
U

U

T
T
T

O
O
O

Whenever some abnormal signal is input to the mechacon

Example (in case of the error number E01):

CPU, an error number (E01, as an exam-ple) is displayed in
the electronic view finder.
In every error status, such the message as shown below al­ternately appear over and over.

E01
UNIT IN
SAFEGUARD MODE

E01
REMOVE AND
REATTACH BATTERY

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

E. VF Symptom Mode when observed

E07 Short circuit of capstan MDA Power ON

E06 CAPSTAN FG input absent EDIT

E04 DRUM FF input absent DRUM rotation

E03 SUPPLY REEL FG input absent REC, PLAY, SEARCH, FF

E02 Mode control motor rotates for more than 10 sec UNLOADING

without shift to next mode

E01 Mode control motor rotates for more than 10 sec LOADING

without shift to next mode.

E00 Overtime the programming transaction REC, PLAY

1.8 DEMONSTRATION MODE

This model has the DEMONSTRATION mode.

1) How to set the DEMONSTRATION mode.

The camera can be entered into the DEMONSTRA-TION
mode by setting on the DISPLAY screen appearing in
the viewfinder.

When entering the camera into the DEMONSTRATION
mode, pay heed to the following matters.

No cassette is set in the camcorder or a cassette is set
in the camcorder but it is protected from recording.

1.

Set the POWER switch to turn on
the “M”.
Press the MENU WHEEL once.
The first page of the DISPLAY
appears in the viewfinder.

MENU Wheel

M

A

F

F

O

Y

A

L

P

Recording Start/Stop Button

Note:

1) The indications of the DISPLAY page very de­pending on the setting.

2) How to cancel the DEMONSTRATION mode.
To cancel the DEMONSTRATION mode, turn the
POWER switch off (“POWER OFF”).

Turn the MENU WHEEL in the

2.
direction of the arrow to set the
cursor at “NEXT”.
Press the MENU WHEEL once.
The second page of the DISPLAY
appears in the viewfinder.

Y

T

S

S

E

N

T

O

C

M

A

R

E

C

M

I

T

I

N

T

.

M

I

T

T

E

L

E

A

M

T

I

T

E

L

L

D

A

T

E

T

M

/

I

D

E

M

O

M

O

R

E

T

U

N

R

U

R

E

A

MMEEN

U

E

O

F

F

E

O

F
C
A

D

F

O

R

O

F

F

N

GM.

F

R

EFNCH

E

E

O

F

See to
next page

Fig. 1-8-1

1-12

Display 1

Display 2

2) As the “DEMO MODE” is executed, the camcoder

Note:

enters the DEMONSTRATION mode after the ti­tle screen of “TITLE CALL” and “FUTURE” appear
in this order.

<Flow chart>

1. TITLE CALL and FUTURE

∫

2. EASY PC CONNECTION

∫

3. CREATE IMAGES & E-MAIL

∫

4. NIGHT-SCOPE OFF

∫

5. NIGHT-SCOPE ON

∫

6. VHS

∫

7. S-VHS (For S-VHS MODEL ONLY)

∫

8. SNAP SHOT

∫

9. PROGRAM AE FOG

∫

10. PROGRAM AE ND EFFECT

∫

11. FADE/WIPE BLACK

∫

12. FADE/WIPE MOSAIC

∫

13. FADE/WIPE SHUTTER

∫

14. FADE/WIPE SLIDE

∫

15. FADE/WIPE DOOR

∫

16. FADE/WIPE CORNER

∫

17. FADE/WIPE WINDOW

∫

18. DIGITAL EFFECT NEGA/POSI

∫

19. DIGITAL EFFECT STRETCH

35. P.STABILIZER ON

34. P.STABILIZER OFF

33. P.STABILIZER ON

32. P.STABILIZER OFF

31. WIDE OFF

30. WIDE ON

29. WIDE OFF

28. DIGITAL EFFECT VIDEO ECHO

27. DIGITAL EFFECT CLASSIC

26. DIGITAL EFFECT STROBE

25. DIGITAL EFFECT SOLARI

24. DIGITAL EFFECT R.FILTER

23. DIGITAL EFFECT B.FILTER

22. DIGITAL EFFECT B/W

21. DIGITAL EFFECT SEPIA

∫

∫

∫

∫

∫

∫

∫

∫

∫

∫

∫

∫

∫

∫

∫

20. DIGITAL EFFECT MOSAIC

3.

Turn the MENU WHEEL in the direction of
the arrow to set the cursor at “DEMO MODE”.
Then, press the MENU WHEEL once.
The third page of the DEMO MODE appears
in the viewfinder.

DENO MODE

OFF

ON

EXI T

Fig. 1-8-2

4. Turn the MENU WHEEL in the direction of
the arrow to set the cursor at “ON”. Then,
press the MENU WHEEL once.
The fourth page of the DISPLAY appears
in the viewfinder. (“DEMO MODE” is
switched “ON” from “OFF” status.)

5. Press the MENU WHEEL once.

Y

S

S

M

A

T

O

C

M

E

I

R

C

T

I

I

N

T

.

T

A

T

E

L

M

E

L

L

I

T

E

T

I

T

A

T

E

D

/

I

D

I

J

L

P

M

O

M

D

E

O

O

V

I

D

O

E

R

N

R

E

U

T

N

U

T

M

MEE

E

E

U

R

A

M

N

E

F

F

O
M
C
A
M

D

U

F

F

E

O

F

F

R

O

O

R

ENACMH

F

N

G

.

E

0

6

O

.

N

O

N

E

S

E

T

Display 4Display 3

The camcorder automatically en­ters the DEMONSTRATION mode
and it repeats demonstration op­eration.
While the camcorder is perform­ing demonstration, all operations
except turning on/off the POWER
switch are ineffectual.

Refer to Fig. 1-8-2.

While the DEMONSTRATION

mode is activated, a word of

DEMONSTRATION is
appearing on the screen
scrolling from right to left.

1-13

1.9 SERVICE NOTE

1 2 3 4 5

6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24

1

2

3

5

4

6

7

(

8

,

9

)

Fig. C6

Fig. C7

Fig. C5Fig. C4

Fig. C3

Fig. C1 Fig. C2

I

0

-

II

VIII

IV

VI

Symbol No.

Removing order of screw

Place to stick screw

Reference drawing

Screw tightening torque

Symbol No.

Removing order of screw

Place to stick screw

Reference drawing

Screw tightening torque

Symbol No.

Removing order of screw

Place to stick screw

Reference drawing

Screw tightening torque

Symbol No.

Removing order of screw

Place to stick screw

Reference drawing

Screw tightening torque

25 26 27

28 29

Fig. C9

Fig. C8

1 2 3 4 5 6 7 8

9 10 11 12 13

14 15 16 17

1

23 4

5

Fig. D5

Fig. D2

Fig. D1

Fig. D3

Fig. D4

III

1 2 3

Fig. 1-5-1

DECK ASSEMBLY

OP B LOCK ASSEMBLY

MAIN ASSEMBLY

→

→

→

→

→

→

→

→

→

→

→

→

→

→

→

→

→

→

→

→

I

: 0.196N·m (2.0kgf

·cm) II : 0.098N

·m (1.0kgf·cm)

III : 0.118N

·m (1.2kgf·cm)

IV

: 0.108N·m (1.1kgf

·cm)

V : 0.147N·m (1.5kgf·cm)

VII VIII: 0.078N·m

: 0.216N

·m (2.2kgf·cm)

VI : 0.049N·m

(0.5kgf·cm)

(0.8kgf·cm)

3

< NOTE >

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

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

Table 1-9-1

1-14

SECTION 2

Roller Driver

PTU94002-2

Jig connector cable

YTU93106A

Cassette torque meter

PUJ50431-2

Alignment tape

MHP-C

Alignment tape

MHP-LC

Extension connector

YTU94145B-30

12

34

56

MECHANISM ADJUSTMENT

2.1 SERVICE CAUTIONS

2.1.1 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. When installing parts, be careful not to do with other parts
as well as not to damage others. (Pay the most careful
attention to the upper drum assembly and tape trans­port mechanism.)

2.1.2 How to read the disassembly and assembly

(For Mechanism Parts)

(1) Order of steps in Procedure

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

(2) Part to be removed or installed.

(3) Location of part.

T = Top
B = Bottom

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

M = Mechanism

(5) Identification of part to be removed, unhooked, un-

locked, released, unplugged, unclamped or unsoldered.

P = Spring
W = Washer
S = Screw
* = Unhook, unlock, release, unplug or unsolder.

(6) Adjustment information for installation.

(+) = Refer to Exploded Views for Lubrication informa­tion.

(For Mechanism Parts)

2.1.3 Required adjustment tools

Table 2-1-1

1,2. Alignment tape

To be used for check and adjustment of interchangeabil­ity of the mechanism.
(Video: Color bar signal, Audio: Non-signal)

3. JIG connector cable

Connected to CN25 of the main board and used for
measuring error rates, etc.

4. Extention connector

To be used to JIG connector cable

5. Cassette Torque Meter

This is used to check the back tension and play torque
during mechanism adjustment.

6. Roller Driver

To be used to turn the roller driver to adjustment of the
linearity of playback envelope.

STEP/LOC.

No.

1
2
3

(1) (2) (3) (4) (5) (6)

ROLLER BASE ASSEMBLY T M 1 (S1) –

TENSION ARM ASSEMBLY T M 1 (P1), (W1a) –

REEL DISC (SUP) T M 1 (W1a), (W1b) _

PART

Fig.
No.

REMOVAL INSTALLATION

*UNHOOK/UNLOCK ADJUSTMENT

/RELEASE/UNPLUG CONDITION

/UNSOLDER NOTE

2-1

2.2 DISASSEMBLY/ASSEMBLY OF MECHANISM PARTS

This procedure starts with the condition that the cabinet parts and deck parts. Also, all the following procedures for adjust­ment and parts replacement should be performed in STOP mode. When reassembling, perform the step(s) in the reverse
order.

STEP/LOC.

No.

1
2
3
4
5
6
7
8
9

0

!
@
#
$
%
^
&
*
(
)
q
w
e
r
t
y
u
i
o
p
Q
W

E
R
T

Y
U

PART

ROLLER BASE ASSEMBLY T M1 (S1) –

TENSION ARM ASSEMBLY T M1 (P1), (W1a) –

REEL DISC (SUP) T M1 (W1a), (W1b) –

SLANT ARM ASSEMBLY T M1 (W1a) –

CANCEL LEVER ASSEMBLY T M2 (W2) –

EJECT LEVER ASSEMBLY T M2 (W2) –

CASSETTE GUIDE (L) ASSEMBLY T M2 (S2) –

SUPPLY CLUTCH ASSEMBLY T M2 (W2) –

WHEEL GEAR T M2 (W2) See, Adjustment procedure for

ROTARY ENCODER B M3 4(S3a)

TIMING BELT B M3 –

CENTER PULLEY UNIT T/B M3 2(S3a) –

CASSETTE GUIDE (R) ASSEMBLY T M3 (S3b), (P3) (Only use S-VHS model)

TU GEAR T M3 (W3a) –

BRAKE SUB GEAR T M3 (W3a) –

P.R ARM ASSEMBLY T M3 (W3b) –

TU GUIDE ARM ASSEMBLY T M3 (W3a) –

LINK ARM ASSEMBLY T M4 (W4) –

LED GUIDE T M4 (S4a) –

A/C HEAD UNIT T M4 2(S4b) –

SLANT POLE BASE ASSEMBLY T M5 (S5a) –

CAP MOTOR ASSEMBLY T M5 3(S5a) –

MOTOR BASE T M5 2(S5b), (S5c) –

BRUSH B M6 (S6a) –

DRUM FINAL T/B M6

GUIDE RAIL T M6 8(S6d) –

POLE BASE (SUP) T M6 –

POLE BASE (TU) T M6 –

COVER PLATE T M7 –

DRIVE LEVER ASSEMBLY T M7 –

MOTOR BRACKET ASSEMBLY T M7 3(S7) –

CONTROL CAM T M8 (W8a) See, Adjustment procedure for

LINK LEVER T M8 –

MIDDLE GEAR T M8 –

LOADING GEAR(T) ASSEMBLY T M8 (W8b) See, Adjustment procedure for

LOADING GEAR(S) ASSEMBLY T M8 (W8b) –

LOADING RING ASSEMBLY T M8 4(S8) See, Adjustment procedure for

Fig.
No.

REMOVAL INSTALLATION

*UNHOOK/UNLOCK ADJUSTMENT

/RELEASE/UNPLUG CONDITION

/UNSOLDER NOTE

Section 2.3

The function of this part varies according
to the assembly (VHS/S-VHS) which this
part is rporated in.

–

2(S6b), 2(S6c) *CATCHER

Section 2.3

Section 2.3

Section 2.3

–

–

–

–

–

–

–

2-2

Table 2-2-1

<TOP VIEW>

31

37

25

26

<BOTTOM VIEW>

1

29

28

27

4

36

2

5

9

3

34

Fig. 2-2-1 TOP VIEW

20

21

19

22

23

17

16

14

15

18

12

33326830357

13

Note:
When reinstalling the cassette housing to
the set, pay careful attention to the switch
not to damage it.

24

11

10

Fig. 2-2-2 BOTTOM VIEW

2-3

(S1)

2

(P1)

(W1a)

(S3b)

(P3)

13

12

(S3a)

16

(W3b)

17

(W3a)

1

(W1a)

(W1a)

3

4

(W1b)

(S3a)

(S3a)

Fig. M1 Fig. M3

(W2)

(S4a)

6

(W3a)

14

(W3a)

15

11

10

(S3a)

(S3a)

19

(W2)

9

5

(S2)

Fig. M2

(W2)

7

20

Fig. M4

(S4b)

(S4b)

(W4)

8

18

2-4

22

(S8)

(S8)

(W8a)

(W8b)

(W8b)

32

33

34

35

36

37

(S5a)

(S5a)

21

(S5a)

31

(S7)

27

(S5b)

Catcher

28

(S5c)

23

Fig. M5 Fig. M7

(S6b)

25

(S6d)

(S6d)

(S6d)

29

30

(S6c)

(S6c)

Fig. M6

(S6d)

26

24

(S6a)

Fig. M8

2-5

2.3 CHECKUP AND ADJUSTMENT OF MECHANISM PHASE

Note:

Pay careful attention to the installing order and phase of
mechanism parts of the loading system.

Align the hole of the Loading gear
(T) assembly to that of the deck.

Align the two holes of the Loading
ring assembly to those of the deck.

Align the hole of the
link lever assembly to
the deck hole.

Align one of the three holes of
wheel gear to the deck hole.

Align this part to each
“Triangle” mark.

Align each one link lever
assembly hole and deck
hole to the hole at the
control cam position.

Fig. 2-3-1 Top of main deck

Align this part to each
“Triangle” mark.

2-6

Fig. 2-3-2 Rotary encoder

2.4 TAPE TRANSPORT ADJUSTMENT

Correct variation of waveform

Bad variation of waveform

In most cases the deck section is in need electrical ad­justment, it results from replacement of worm mechanical
parts or video heads. In the event of malfunction with elec­trical circuits, troubleshouting with the aid of proper test in­struments most be done first, and then commence neces­sary repair, replacement and adjustment, etc.

2.4.1 Back tension

1. Set a cassette torque meter onto the deck and measure
the back tension in standard REC mode to confirm that
the back tension is 0.7x10

-3

– 1.37x10-3 N•m.

2. If not, replace the tension band.
When the value widely fluctuates in the measurement,
replace the supply reel disk.

3. With the cassette torque meter, confirm that the play
torque is 1.47x10

-3

– 2.45x10-3 N•m.

If necessary, replace the center pulley unit.

Back tension

-3

0.7x10
(7-14gf·cm)

- 1.37x10-3 N•m
Play torque

1.47x10

-3

- 2.45x10-3 N·m

(15-25gf·cm)

8. When the FM waveform breaks in the level varying proc­ess, subtly adjust the height of guide rollers at every
breaking point so that the waveform varies as flat as pos­sible.
Repeat the above steps 6. and 7. several times to con­firm that the waveform is flat as a whole.

9. Playback the SP stairstep signal of alighment tape and
adjust the tracking control to maximize the FM wave­form, confirm that FM waveform variation is always flat.

10. Record the signal and play it back in both of the SP and
EP modes, and confirm that the FM waveform is flat in
both modes.

Note:

Among the above-mentioned adjustment steps,
the items of No.9 and No.10 are needed for the
EP model only.

CH-2

1 field

Flatten waveform.

Causer by wrong height
of supply guide roller

Caused by wrong height
of take-up guide roller

Fig. 2-4-1 Cassette torque meter

2.4.2 Tape pattern

1. Remove the Cover (JIG) shwon on Fig. 2-6-1 (Page 2-

10).

2. Connect the jig connector cable to CN25 on the MAIN
board as shwon on Fig. 2-6-1 (Page 2-10).

3. Observe signal at V. TP FM with external trigger from V.
FF on the jig connector cable.

4. Playback the SP stairstep signal of the alignment tape
and maximize the FM waveform by the tracking button.

5. Set the tracking control to the center position by simul­taneously pressing the tracking (-) and (+) buttons and
maximize the FM waveform by the tracking button.

6. If the observed FM waveform is not flat, adjust the height
of the supply of take-up guide roller with the roller driver.

Note:

To prevent the tape from damage, turn the guide
rollers slowly.

7. By operating the tracking button (both in + and – direc­tions) in the manual tracking mode, vary the output level
of the FM waveform from maximum to minimum and vice
versa to confirm that the waveform varies nearly in a flat
shape.

Fig. 2-4-2 FM waveform-1

Fig. 2-4-3 FM waveform-2

(U)

2-7

11. Through the above steps, confirm that there occur no
wrinkling and damage in the tape around the pinch roller
and TU guide pole whenever the deck is in operation of
Loading/Unloading, Search Rewind and at mode change
from Search Rewind to play mode. If wrinkling or dam­age in the tape occurs around the TU guide pole, ad­just the angle (slant) of the A/C head to the tape. So that
the tape normally runs along the lower flange of the guide
pole.

Pole base (SUP)
(Guide roller)

Pole base (TU)
(Guide roller)

TU guide
pole

2.4.3 A/C head height & azimuth

1. Connect the jig connector cable to CN25 on the MAIN
board.

2. Connect the channel-1 scope probe to the audio output
and connect the channel-2 scope probe to PB CTL.

3. Playback the alignment tape.

4. Set the tracking to its center range by pressing the (+)
and (–) tracking controls simultaneously.

5. Adjust screws A , B and C approximately 45 degrees
in the same direction to obtain maximum audio output
and CTL signal levels.

6. As a final fine adjustment, adjust screw B for minimum
signal level fluctuation and screw C for maximum out­put signal level.

Tension
pole

Fig. 2-4-4 Tape transport system

Pinch
roller

Screw A

A/C head

Fig. 2-4-5 A/C head

Screw C

Screw B

Audio
signal

Control
pulse
signal

2-8

Fig. 2-4-6 Audio and CTL signal

2.4.4 Phase of control head (X value)

1. Connect the jig connector cable to CN25 on the MAIN
board.

2. Playback the SP stairstep signal of the alignment tape
and observe signal at V.TP FM with external trigger from
V.FF on the jig connector cable.

3. Operate the tracking button in the center and manual
tracking mode by pressing the tracking (+) and (–) but­tons and confirm that the FM output level is maximum at
the center position as shown in Fig. 2-4-8.

4. If necessary, slightly loosen the setscrews D and E and
insert the Tweezers into the notch and guide hole to
move the A/C head fully in the direction of the capstan
to the extent.

5. Gradually move the A/C head toward the drum to find
the position where the FM output level maximum for the
first time (a – b in Fig. 2-4-8).

6. Fine adjust the phase of the A/C head and tighten the
screws D and E at the point a.

A/C head

Insert the
Tweezers

2.5 REMARKS

2.5.1 Cleaning

1. For cleaning of the upper drum (particularly video
heads), use fine-woven cotton cloth or Kimwipe with al­cohol soaks through. Do not move the cloth but turn the
upper drum counterclockwise.

Note:

Make sure not to move the cloth in the vertical di­rection to the video head, since it may cause dam­age of the video heads.

2. For cleaning of parts of the tape transport system ex­cept the upper drum, use fine-woven cotton cloth or cot­ton swab soaked alcohol.

3. After cleaning, confirm that the cleaned parts are com­pletely dry before loading the deck with cassette tape.

2.5.2 Applying oil and grease

1. Periodical oiling and greasing are not required but should
be done to new parts when replacing. If oil and grease
on the other parts of the other party are old and dirty,
wipe them clean and apply new oil or grease.

2. For parts and points to apply oil and grease, refer to the
exploded view of the mechanism assembly (M3).
Table 2-5-1 specifies oil and grease to be used.

3. When oiling, clean the objective parts with alcohol first
and apply one or two drop(s) of oil. Too much oiling
causes rotary parts to slip because of oil leakage.

Screw D

Screw E

Fig. 2-4-7 Phase of control head

a

FM output

Direction of capstan

Adjusting
point

A/C head phase

b

Max

Direction of drum

Fig. 2-4-8 Phase adjustment point of control head

Classification Name Symbol in drawing

Grease KYODO-SH-P AA

Oil YTU94027 BB

Table 2-5-1 Specific oil and grease to be used

2.5.3 Checkup

After replacement of the supply reel disk and tension band,
make sure to inspect back tension according to the adjust­ment procedure of MECHANISM ADJUSTMENT section.

Zero

2-9

2.6 JIG CONNECTOR CABLE CONNECTION

Remove the cover (JIG).

Jig connector cable

CN25

Cover(JIG)

Extention connector

For supplying the power through the coupler by removing

NOTE:

the cover (for jig), use this extension connector double

JIG CONNECTOR COMMUNICATION CABLE

to 10 pin

( RXD )

( TXD )

RED

WHITE

BLACK

to 28 pin

to 4/5/6/8 pin

( GND )

for connecting the jig connector cable.

Fig. 2-6-1 Jig connector cable connection

MAIN BOARD CN25 Jig BOARD

DIAL_MN

CVF_B

BWVFADJ

CVF_G

VF_RPD

CVF_R

PLI_AD

VPP_7.8V

JIGCN_SW

DISCHG_L

MCU_RST

TCCS_TXD

V_TP_FM

V_OUT
V_OVL

AO_SIG_J

PB_CTL
AL_3.2V

EJECT_SW

GND

GND

NC

GND

GND

V_FF

RXD

TXD

NC
NC
NC

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

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

1

DIAL_MN
CVF_B

2

BWVFADJ
CVF_G

3

VF_RPD
CVF_R

4

GND
PLI_AD

5

GND
NC

6

GND
VPP_7.8V

7

JIGCN_SW
DISCHG_L

8

GND
MCU_RST

9

TCCS_TXD
V_FF

10

RXD
V_TP_FM

11

V_OUT
V_OVL

12

AO_SIG_J
PB_CTL

13

AL_3.2V
TXD

14

EJECT_SW
NC

15

NC
NC

2-10

Fig. 2-6-2 Jig connector cable schematic diagram

SECTION 3

Service Support System

RS232C

COM Port

PC CABLE

Personal Computer

MENU

Cover(JIG)

Jig connector cable

Extention connector

CN25

RED

to 10 pin

( RXD )

WHITE

BLACK

to 28 pin

( TXD )

to 4/5/6/8 pin

( GND )

JIG CONNECTOR COMMUNICATION CABLE

For supplying the power through the coupler by removing
the cover (for jig), use this extension connector double
for connecting the jig connector cable.

NOTE:

ELECTRICAL ADJUSTMENT

3.1 ELECTRICAL ADJUSTMENT

3.1.1 Preparation

1. Precaution

This model does not contain adjustment controls (VR).
General deck system, camera system and monitor system
adjustment are not required. However, if MAIN board and
MONITOR board need replacement, please use original E
2 PROM onto new board. Then adjustment are not required.
And if parts such as the following need replacement, spe­cial computerized adjustment are required (Refer to “5. Con­nection for Service support system”.). Please contact to JVC
Service for detaile information.

• OP block

• EEP ROM (IC102 of MAIN board)

• MONITOR

In the event of malfunction with electrical circuits, trouble­shooting with the aid of proper test instruments most be done
first, and then commence necessary repair, replace-ment
and adjustment, etc.

1. In case of wiring to chip test points for measurement,
use IC clips, etc. to avoid any stress.

2. Since connectors are fragile, carefully handle them in dis­connecting and connecting.

3. Shortcircuit between operation un it and DECK chassis.

2. Required test equipment

1. Color TV monitor.

2. AC power adapter

3. Oscilloscope (dual-trace type, observable 100 MHz or
higher frequency)

* It is recommended to use one observable 300 MHz or

higher frequency.

4. Digital voltmeter

5. Frequency counter (with threshold level adjuster)

6. Personal computer

3. Required adjustment tools

For detsails of special jigs necessary for adjustment, refer
to page 1-2 and 1-3 of the Section 1.

4.

Setup for E. VF section adjustment [B/W VF model only]

Referring to “SEC. 1 DISASSEMBLY” and connect the E. VF
WIRE to CN12 of the MAIN board.

(LY20701)

Bottom case assy

Parts No.

LY20701

Adjustment ltem : 3.2

Note:

•

This adjustmentalls into a special adjustment that requires

a personal computer. For details, refer to “3.1.1 Prepara­tion”.

Serial No. label

Screw

5. Connection for Service support system

Fig. 3-1-1 Connection for Service support system

3-1

3.2 ELECTRONIC VIEWFINDER (E. VF) ADJUSTMENT [B/W VF model only]

Notes:

•

Unless otherwise specified, all measurement points and
adjustment parts are located on E. VF board.

•

After adjustment or replacement of the deflection yoke
or the centering magnet, fix it by the band as shown the
figure below.

TOP VIEW

CENTERING

CRT

MAGNET

STOPPER

Fig. 3-2-1 E. VF

•

After adjustment is completed, compare the picture on
the E. VF screen with the monitor TV.

CENTERING

CRT

MAGNET

STOPPER

1) Put the deflection yoke to the most inner side of CRT
neck first. Then fix the stopper temporary.

2) Adjust the tilt of picture on the E. VF screen by tilting
the deflection yoke.

3) Fix the stopper completely.

3.2.2 Centering

Subject • Alignment tape

• Stairstep

Mode • PB

Equipment • E. VF

Measurement point • E. VF screen

Adjusting part • Centering magnet (CRT assy)

Specification • The center of the E. VF screen

1) While observing the viewfinder screen, adjust the

centering magnet to locate the stairstep in the center
of the view-finder screen.

3.2.3 Vertical scanning

Subject • Camera picture

Mode • EE

Equipment • E. VF

Measurement point • E. VF screen

Adjusting part • VR7001 (V. SIZE)

Specification • Normal picture amplitude

F.B.T

Fig. 3-2-2 E. VF

VR7003

CN7001

FOCUS

T7001

VR7002
BRIGHT

CN7002

60 E. VF PWB ASSY

VR7001

V. SIZE

Fig. 3-2-3 E. VF board

3.2.1 Tilt

Subject • Alignment tape

• Stairstep

Mode • PB

Equipment • E. VF

Measurement point • E. VF screen

Adjusting part • Deflection yoke

Specification •The picture is visible as same as

monitor TV.

1) Observing the viewfinder screen, adjust VR7001 for nor-

mal picture amplitude.

3.2.4 Brightness

Subject • –

Mode • EE

• Lens closed

Equipment • E. VF

Measurement point • E. VF screen

Adjusting part • VR7002 (BRIGHT)

Specification •

The CRT raster is just barely visible

1) Close the lens with the cap and adjust VR7002 so that

the raster of the CRT is just visible in the E. VF.

3.2.5 Focus

Subject • Camera picture

Mode • EE

Equipment • E. VF

Measurement point • E. VF screen

Adjusting part • VR7003 (FOCUS)

Specification •

The center area is clear and defined

1) While observing the viewfinder screen, adjust VR7003

so that the picture at the central area of the screen is
clear and defined.

3-2