JVC VU-FC1KUS Service Manual

SERVICE MANUAL

CÁMARA DE VIDEO VHS COMPACTO

GR-FC1UM,

VU-FC1K

- GR-FC1UM - - VU-FC1KUS -

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

US

ESPECIFICACIONES

Formato : Norma NTSC VHS
Alimentación : DC 9 V
Consumo de energía : 3,4 W
Sistema de señales : Tipo NTSC
Sistema de registro de video

Luminancia : Registro por FM
Color : Registro directo por

subportadora convertida
Según la norma VHS

Cassette : Videocassette
Velocidad de la cinta :
Tiempo máximo de

grabación : 40 minutos

Temperatura de

funcionamiento :10°C a 40°C

Margen de humedad

para funcionamiento : 35% a 80%

Temperatura de

almacenamiento : –20°C a 50°C

Peso : Aprox. 590 g

33,35 mm/s

Dimensiones : 65 mm x 115 mm x
(An x Al x Pr) 182 mm

(con el visor
completamente inclinado
hacia abajo)

Fonocaptor : CCD de 1/6"
Objetivo : F3,5, f = 3.2 mm
Ajuste del balance del

blanco : Automático

Accesorios opcionales

•VHS (
TC-40/30/20

•Bolso CB-V7U

•Adaptador de Cassete C-P7U

Algunos accesorios no se encuentran disponibles
en ciertas áreas. Por favor consulte a su agente
más cercano de JVC antes de comprar los
accesorios opcionales.

) Compacto (cassettes VHS-C)

Los especifiaciones indicadas corresponden al modo SP a menos que se especifique lo contrario. Diseño
y especificaciones sujetos a cambio sin previo aviso.

COPYRIGHT © 2003 VICTOR COMPANY OF JAPAN, LTD

GR-FC1UM M3A1

VU-FC1KUS M3ACC

No.86744

2003/05

TABLE OF CONTENTS

Section Title Page Section Title Page

Important Safety Precautions
INSTRUCTIONS

GR-FC1UM

1. DISASSEMBLY

1.1 BEFORE ASSEMBLY AND DISASSEMBLY............................ 1-1

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

1.1.2 Assembly and disassembly................................................... 1-1

1.1.3 Destination of connectors ..................................................... 1-1

1.1.4 Disconnection of Connectors (Wires) ................................... 1-1

1.1.5 Tools required for disassembly and assembly ...................... 1-1

1.2 DISASSEMBLY/ASSEMBLY OF CABINET PARTS................. 1-2

1.2.1 Disassembly flow chart ......................................................... 1-2

1.2.2 Disassembly method............................................................. 1-2

1.3 EMERGENCY DISPLAY .......................................................... 1-5

1.4 TAKE OUT CASSETTE TAPE ................................................. 1-5

1.5 SERVICE NOTE ...................................................................... 1-6

2. MECHANISM

Refer to the SERVICE MANUAL No.86700(MECHANISM ASSEMBLY)

3. ADJUSTMENT

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

3.2 TOOLS REQUIRED FOR ADJUSTMENT ............................... 3-1

3.3 MECHANISM ADJUSTMENT .................................................. 3-3

3.3.1 TAPE TRANSPORT ADJUSTMENT ..................................... 3-3

3.3.2 Back tension ......................................................................... 3-3

3.3.3 Tape pattern .......................................................................... 3-3

3.3.4 A/C head height & azimuth ................................................... 3-4

3.3.5 Phase of control head (X value)............................................ 3-5

3.4 ELECTRICAL ADJUSTMENT .................................................. 3-6

3.4.1

ELECTRICAL ADJUSTMENT WITH PERSONAL COMPUTER .

5. PARTS LIST

5.1 EXPLODED VIEW ...................................................................... 5-1

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

5.1.2 FINAL ASSEMBLY <M2> ...................................................... 5-2

5.1.3 MECHANISM ASSEMBLY <M3>.......................................... 5-4

5.2 PARTS LIST................................................................................ 5-5

PACKING AND ACCESSORY PARTS LIST<M1>.......................... 5-5

FINAL PARTS LIST<M2>................................................................ 5-5

MECHANISM PARTS LIST<M3>.................................................... 5-5

MAIN BOARD ASSEMBLY <01> .................................................... 5-7

CCD BOARD ASSEMBLY <02> ..................................................... 5-9

VU-FC1KUS

6. PARTS LIST

6.1 PACKING AND ACCESSORY ASSEMBLY<M1> ....................... 6-1

3-3

4. CHARTS AND DIAGRAMS

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

4.2 MAIN(CPU) SCHEMATIC DIAGRAM ...................................... 4-5

4.3 MAIN(M.MDA) SCHEMATIC DIAGRAM.................................. 4-7

4.4 MAIN(DSP) SCHEMATIC DIAGRAM....................................... 4-9

4.5 MAIN(REG) SCHEMATIC DIAGRAM .....................................4-11

4.6 MAIN(VTR ASP) SCHEMATIC DIAGRAM............................. 4-13

4.7 MAIN(TG/CDS) SCHEMATIC DIAGRAM .............................. 4-15

4.8 CCD SCHEMATIC DIAGRAM................................................ 4-16

4.9 MAIN CIRCUIT BOARD......................................................... 4-17

4.10 CCD CIRCUIT BOARD .......................................................... 4-21

4.11 POWER SYSTEM BLOCK DIAGRAM................................... 4-22

4.12 CAMERA AND Y/C SYSTEM BLOCK DIAGRAM.................. 4-23

4.13 CPU/MDA SYSTEM BLOCK DIAGRAM ................................ 4-25

Important Safety Precautions

Connector

Metal sleeve

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.

v

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.

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.

1.25

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

1

S40888-01

v

d'

d

Chassis

Power cord,
primary wire

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

Z
V

Fig. 9

ab

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.

AC inlet

Earth pin

AC Line Voltage

100 V
100 to 240 V
110 to 130 V

110 to 130 V
200 to 240 V

Exposed accessible part

Milli ohm meter

Fig. 10

Region

Japan

USA & Canada

Europe & Australia R 10 MΩ/500 V DC

Region Load Z

Insulation Resistance (R)

≤

R 1 MΩ/500 V DC

≥≥

1 MΩ R 12 MΩ/500 V DC

≤

Table 1 Specifications for each region

Grounding Specifications

Region
USA & Canada
Europe & Australia

Dielectric Strength

AC 1 kV 1 minute
AC 1.5 kV 1 miute
AC 1 kV 1 minute

AC 3 kV 1 minute
AC 1.5 kV 1 minute

(Class 2)
(Class 1)

Grounding Impedance (Z)

≤

Z 0.1 ohm

≤

Z 0.5 ohm

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)

a, b, cLeakage Current (i)AC Line Voltage

100 V

110 to 130 V

110 to 130 V
220 to 240 V

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

Japan

USA & Canada

Europe & Australia

Table 2 Leakage current specifications for each region

1 kΩ

0.15 µF

1.5 kΩ

2 kΩ

50 kΩ

2

≤

i 1 mA rms Exposed accessible parts

≤

i 0.5 mA rms

≤

i 0.7 mA peak

≤

i 2 mA dc

≤

i 0.7 mA peak

≤

i 2 mA dc

Exposed accessible parts

Antenna earth terminals

Other terminals

S40888-01

SECTION 1

DISASSEMBLY

1.1 BEFORE ASSEMBLY AND DISASSEMBLY

1.1.1 Precautions

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

2. 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).

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

4. Be careful in removing or handling the part to which some
spacer or shield is attached for reinforcement or insulation.

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

6. Tighten screws properly during the procedures. Unless
specified otherwise, tighten screws at a torque of 0.196N•m
(2.0kgf•cm).

1.1.2 Assembly and disassembly

[Example]

STEP

No.

[1]

LOWER CASE ASSEMBLY

[2]

B/W VF ASSEMBLY

[3]

TOP OPE UNIT

[4]

CASE COVER(S) ASSEMBLY
CASE COVER(M) ASSEMBLY

PART

Fig.
No.

Fig.C1

Fig.C2

POINT

8(S1),CN1a,b,c
3(S2)
CN3,L3a,2(L3b)
(S4),2(L4)

NOTE

-

-

-

-

1.1.4 Disconnection of Connectors (Wires)

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

Flat wire

Connector

Fig. 1-1-1

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.

Flat wire

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

(1) Order of steps in Procedure

When reassembling, preform the step(s) in the reverse or­der. These numbers are also used as the identification (lo-

cation) No. of parts Figures.
(2) Part to be removed or installed.
(3) Fig. No. showing Procedure or Part Location.

C = CABINET

D = CAMERA AND BOARD ASSEMBLY
(4) Identification of part to be removed, unhooked, unlocked,

released, unplugged, unclamped or unsoldered.

P = Spring

W = Washer

S = Screw

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

2(S3) = 2 Screws (S3)

CN = Connector
(5) Adjustment information for installation.

1.1.3 Destination of connectors

Two kinds of double-arrows in connection tables respec-

tively show kinds of connector/wires.

↔ : Wire
⇔ : Flat wire (FPC, FFC)

[Example]

CONN.

No.

CN1a MAIN CN27 ↔ SPEAKER – 2

CONNECTOR

Pin No.

Remove the parts marked in .

Connector

Fig. 1-1-2

1.1.5 Tools required for disassembly and assembly

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

1

3

Torque driver

YTU94088

Cleaning cloth

KSMM-01

2

Bit

YTU94088-003

Fig. 1-1-3

1. Torque driver

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

2. Bit

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

3. Cleaning cloth

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

1-1

1.2 ASSEMBLY AND DISASSEMBLY OF CABINET PARTS

1.2.1 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.

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

LOWER CASE ASSY

C. COVER ASSY

C. COVER INSIDE

BATT. COVER ASSY

BATT. CASE ASSY

UPPER CASE

FRONT COVER SA

FRONT FRAME ASSY

OP ASSY (inc. CCD BOARD ASSY)

MAIN BOARD ASSY

SHIELD PLATE

1.2.2 Disassembly method

STEP

No.

[1]
[2] C.COVER ASSY 1(S2), 2(L2) –
[3] C.COVER INSIDE 4(L3) –
[4] BATT. COVER ASSY 2(L4) –
[5] BATT. CASE ASSY 4(S5), 2(L5) –
[6] UPPER CASE 1(S6), 2(L6) –
[7] FRONT COVER SA 2(S7), 2(L7), CN8 –
[8]
[9] OP ASSY 2(S9), CN22 –

[10] MAIN BOARD ASSY

[11] SHIELD PLATE 2(S11) –
[12] MECHANISM ASSY 3(S12), 2(L13) –

CONN.

No.

CN8 MAIN CN8 ↔ MIC ASSY – 2

CN22 MAIN CN22 ⇔ CCD

CN1 MAIN CN1 ⇔ MECHANISM – 10
CN2 MAIN CN2 ⇔ MECHANISM – 14
CN3 MAIN CN3 ⇔ MECHANISM – 18
CN4 MAIN CN4 ↔ MECHANISM – 2
CN5 MAIN CN5 ⇔ MECHANISM – 11
CN7 MAIN CN7 ⇔ MECHANISM – 11

PART

LOWER CASE ASSEMBLY

FRONT FRAME ASSY

Fig.
No.

Fig.1-2-1

6(S1) –

2(S8) –

Fig.1-2-2

2(S10), CN1(C3),
2(SD10), CN2(F3),
CN3(A2), CN4(D2),
CN5(E3), CN7(B2)

CONNECTOR

POINT

CN5301

Remove the parts marked in .

NOTE

–

Pin No.

16

[12]

MECHANISM ASSY

1-2

i

j

THE SLIDE IS DONE IN THE SAME DIRECTION
AS THE SLIDE SWITCH OF MAIN PWB AND
LOWER CASE IS INSTALLED .

j

6

[1] LOWER CASE ASSY

i

4

(S1)

(S1)

(S1)

5

3

(S1)

2

(S1)

1

(S1)

[6] UPPER CASE

(L6)

2

11

[8] FRONT FRAME ASSY

14

(S8)

c

(S6)

e

e

[7] FRONT COVER SA

(S7)

12

(L7)

(L2)

2

[3] C.COVER INSIDE

[5] BATT.CASE ASSY

(S5)

8

g

(S5)

9

h

(L4)

2

7

(S5)

f
g

(L5)

4

(L3)

k

h

7

k

(S2)

b

c

13

(S7)

a

a

b

15

(S8)

d

(L7)

d

[2] C.COVER ASSY

CN8

A

A

DRAWING FOR MIC WIRE ARRANGEMENT.

THE SLACK OF WIRE
IS PROCESSED IN
THIS PART AS SHOWN
IN FIGURE.

WIRE PASSED THE LOWER

f

A SIDE VIEW

IC1601

SIDE OF THIS RIB.

THE INDSIDE OF
THIS BOSS IS PASS.

SO AS NOT TO PUT MIC WIRE ON IC601,
FIGURE IS PROCESSED TO A ROLL DOWNWARD.

[9] OP ASSY

Inc. CCD BOARD ASSY

i

CN22

i

(S5)

10

[4] BATT.COVER ASSY

(L5)

A

CONFIRM TERMINALS ARE CAUGHT IN
THIS HOOK WUEN BATT.CASE ASS'Y
IS INSTALLED.

17

(S9)

16

(S9)

WRXXX

Fig. 1-2-1

1-3

[10] MAIN BOARD ASSY

18

CN2

(S10)

2

(SD10)

F3

19

(S10)

NOTE THE UNDERMENTIONED CONYENT WHEN SOLDERING.

A

A2

B2

CN3

CN7

CN5

CN1

CN4

E3

C3

D2

SOLDER ALL SURROUNDINGS
OF TERMINALS

A SIDE VIEW

23

(S12)

ATTACH TERMINALS.

FRAME

TERMINALS ARE INSTALLED IN THE
POSITION OF FIGURE .

IT HANGS IT

IT HANGS IT

A

INSERT TERMINAL 1 IN
THE INTERIOR , SURELY .

FRONT COVER SA

FRONT COVER ASSY

TERMINAL 3

TERMINAL 2

A SIDE VIEW

IT PUTS THE
POINT IN THE
HOLE .

TERMINAL 2 AND TERMINAL 3 HANG
ON THE HANGING PART , AND PUT
THE TERMINAL POINT AT THE END .

22

(S12)

FRAME ASSY

a

c

b

F1

F2

[12] MECHANISM ASSY

24

(S12)

b

e

MIC CAP

B1

A1

B2

A2

C1

E1

D1

d

E2

[11] SHIELD PLATE

C2

D2

CUSHION(ECM)

MIC ASSY

CUSHION

TAP SCREW x3

e

C2

C3

E2

F2

F3

A1

a

E3

21

(S11)

20

(S11)

CUSHION(ECM)

MIC ASSY

MIC IS INSERTED IN THE
INTERIOR OF MIC (CUSHION) ,
AND MIC IS COVERED WITH

MIC (CUSHION) .

MIC CAP

PART A OF MIC (CUSHION)
IS DRAWN OUT FROM THE HOLE .
DITCH PART B IS MADE TO
ENTER AROUND ALL THESE PARTS .

B1

c

CUSHION

THE CONNECTOR OF MIC IS PUT OUT
FROM THE INSIDE OF CUSHION
OUT SIDE THROUGH THIS SLIT PART .

c

MIC CAP

a

a

CONNECTION PART OF WIRE
IS MADE TO COME NEAR IS
THIS DITCH .
COVER MIC CAP WITH CUSHION

b

WHILE DRAWING OUT MIC WIRE

FROM CUSHION .

c

THE RIB OF MIC CAP IS PUT
OUT FROM PART a , PART b ,
AND PART c .
MIC CAP IS COVERED WITH
THE RABBER FRAME OF CUSHION .

b

D1

C1

d

E1

1-4

F1

Fig. 1-2-2

1.3 EMERGENCY DISPLAY Example (in case of the error number E01):

Whenever some abnormal signal is input to the mechacon CPU,
an error number (E01, as an example) 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 CAPSTAN rotation
E04 DRUM FG input absent DRUM rotation
E03 SUPPLY REEL FG input absent REC, PLAY, SEARCH, FF/REW
E02 Mode control motor rotates for more than 6.0 sec UNLOADING without shift to next

UNLOADING

mode.
E01 Mode control motor rotates for more than 6.0 sec LOADING without shift to next mode. LOADING
E00 Overtime the programming transaction REC, PLAY

1.4 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 UPPER CASE. (refer to "1.2 ASSEMBLY

AND DISASSEMBLY OF CABINET PARTS".)

(3) Connect a jumper wire to each pole of the LOADING

MOTOR as shown by the magnified view (Fig. 1-4-1).

(4) While holding down the cassette housin g by hand, con-

nect 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

(NTSC)

BATTERY

(DC1.5V)

MAGNIFIED VIEW

.

b

TAKE-UP GEAR

Fig.1-4-1

1-5

1.5 SERVICE NOTE

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

< 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.

I : 0.196N·m (2.0kgf·cm) II : 0.118N·m (1.2kgf·cm) III : 0.204N·m (2.08kgf·cm)

[1] [2]

[11] [12][10]

[5] [9][6] [7] [8]

II

I III I

II

Fig.1-3-1

Fig.1-3-2

1.3 DISASSEMBLY/ASSEMBLY OF CABINET PARTS AND BOARD ASSEMBLY

1234567891011121314151617

18 19 20 21 22 23 24

Use the following chart to manage to screws.

Table 1-5-1

1-6

3.1 PREPARATION

SERVICE

SUPPORT

SYSTEM

RS232C

COM PORT

PC CABLE

PERSONAL

COMPUTER

MENU

DC POWER

SUPPLY

DC6.3V

GND

COVER(JIG)

JIG CONNECTOR
CABLE

CN25

RED

TO RXD

WHITE

BLACK

TO TXD

TO BATT+

TO GND

TO GND

JIG CONNECTOR

COMMUNICATION CABLE

(1) Precaution

NOTE:
This model uses a dry cell as power supply. (can not
use AC adapter.)
Therefore, when adjusting, use DC POWER SUPPLY
and supply 6.3V to JIG connector.

This model does not contain adjustment controls (VR).
General deck system, camera system and monitor system
adjustment are not required. However, if MAIN board need
replacement, please use original EEP ROM on to new
board. Then adjustment are not required. And if parts such
as the following need replacement, special computerized
adjustment are required. 3.4.1 ELECTRICAL ADJUST­MENT WITH PERSONAL COMPUTER is setup and it ad­justs using a service support system. Please contact to
JVC Service for detail 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, replace­ment and adjustment, etc.

a) In case of wiring to chip test points for measurement,

use IC clips, etc. to avoid any stress.

b) Since connectors are fragile, carefully handle them in

disconnecting and connecting.

c) Short circuit between operation unit and DECK chas-

sis.

(2) Required test equipment

a) Color TV monitor.
b) DC power supply
c) Oscilloscope (dual-trace type, observable 100 MHz

or higher frequency)

• It is recommended to use one observable 300 MHz
or higher frequency.

d) Digital voltmeter
e) Frequency counter (with threshold level adjuster)

f) Personal computer

SECTION 3

ADJUSTMENT

(3) Connection

When adjusting, connect each required equipment(s)
shown in figure.

Fig. 3-1-1

3-1

3.2 TOOLS REQUIRED FOR ADJUSTMENT

Alignment tape

1

Cassette torque meter

3

5

7

9

PUJ50431-2

INF adjustment lens

YTU92001B

Gray scale chart

YTU94133A

INF lens holder

YTU94087

MHP-C

Alignment tape

2

4

PTU94002-2

6

YTU92001-111

Color bar chart

8

10

YTU94133C

Light box assembly

YTU93096A

MHP-LC

Roller driver

Conn. ring

1,2. Alignment tape

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

3. Cassette torque meter

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

4. Roller driver

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

5.INF adjustment lens

To be used for adjustment of the camera system. For the us­age of the INF adjustment lens, refer to the Service Bulletin
No. YA-SB-10035.

6.Conn. ring

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

7.Gray scale chart

To be used for adjustment of the camera system. For the us­age of the INF adjustment lens, refer to the Service Bulletin
No. YA-SB-10035.

8.Color bar chart

To be used for adjustment of the camera system. For the us­age of the INF adjustment lens, refer to the Service Bulletin
No. YA-SB-10035.

9.INF lens holder

To be used together with the Camera stand (11) for operating
the Videocamera in the stripped-down condition such as the
status without the exterior parts or for using commodi ties that
are not yet conformable to the interchangeable ring. For the
usage of the INF lens holder, refer to the Service Bulletin No.
YA-SB-10035.

11 12

13

Camera stand

YTU93079

Communication cable

YTU93107A

PC cable

QAM0099-002

14

1615

Fig.3-2-1

Jig connector cable

YTU93082G

Service support system

YTU94057-65

Cleaning cloth

KSMM-01

3-2

10.Light box assembly

To be used for adjustment of the camera system. For the us­age of the Light box assembly, refer to the Service Bulletin No.
YA-SB-10035.

11.Camera stand

To be used together with the INF adjustment lens holder. For
the usage of the Camera stand, refer to the Service Bulletin
No. YA-SB-10035.

12. Jig connector cable

To be connected to the Jig connector jack of the main board
and used for measurement and adjustment.

MAIN CN25 JIG BOARD (LABEL)

AL_L3.2V 1 1 AL_L3.2V

MCU_RST 11 2 BATT+

BATT+ 2 3 BATT+

V_TP_FM 12 4 C_OUT

BATT+ 3 5 DIAL_PB

V_FF 13 6 Y_OUT

C_OUT 4 7 GND

PB_CTL 14 8 GND

DIAL_PB 5 9 GND

REG_4.8V 15 10 V_OVL

Y_OUT 6 11 MCU_RST

AO_SIG_J 16 12 V_TP_FM

GND 7 13 V_FF

TXD 17 14 PB_CTL

GND 8 15 REG_4.8V

RXD 18 16 AO_SIG_J

GND 9 17 TXD

JIGCN_SW 19 18 RXD

V_OVL 10 19 JIGCN_SW

VPP_7.8V 20 20 VPP_7.8V

Fig.3-2-2

13.Communication Cable

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

14.Service support system

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

15.PC cable

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

16.Cleaning cloth

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

3.3 MECHANISM ADJUSTMENT

3.3.1 TAPE TRANSPORT ADJUSTMENT

Mechanism adjustment is needed when DRUM ASSEMBLY or a
part of the tape transport system is replaced. To protect tapes
from damage, first clean the tape transport system, next confirm
that nothing is wrong with the tape transport system by using a
tape that can be disposed of, and then perform adjustment with
alignment tape. Some exterior parts should be removed before
some adjustment procedures, depending on the procedures.

POLE BASE (SUP)
(GUIDE ROLLER)

POLE BASE (TU)
(GUIDE ROLLER)

TU GUIDE
POLE

A/C HEAD
ASSEMBLY

TENSION
POLE

PINCH
ROLLER

Fig.3-3-1

3.3.2 Back tension

Remove the exterior parts attached to CASSETTE HOUSING
ASSEMBLY so that scales of CASSETTE TORQUE METER can
be read.

• CASE COVER(S),(M) ASSEMBLY

• C. COVER INSIDE

CASSETTE TORQUE METER

Fig.3-3-2

(1) Set a cassette torque meter onto the deck and measure the

back tension in standard PB mode to confirm that the back
tension is 0.97x10

-3

- 1.71x10-3 N•m.

(2) If not, replace the tension band.

When the value widely fluctuates in the measurement,
replace the SUPPL Y 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.

3-3

BACK TENSION

0.97x10
(10-17gf·cm)

-3

- 1.71x10-3 N•m
PLA Y T ORQUE

1.47x10

-3

- 2.45x10-3 N·m

(15-25gf·cm)

Fig.3-3-3

3.3.3 Tape pattern

Remove the exterior parts attached to the UPPER CASE
ASSEMBL Y so that the guide roller beside the DRUM ASSEMBLY
can be rotated.

• LOWER CASE ASSEMBLY

• TOP OPE UNIT

• CASE COVER(S),(M) ASSEMBLY

• UPPER CASE (S),(M) ASSEMBLY

NOTE:

In performing adjustment, it is recommended that LOWER
CASE ASSEMBLY and TOP OPE UNIT are attached to the
main body for better operation and safety.

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.

(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 ad-

just 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.

POLE BASE (TU)
(GUIDE ROLLER)

POLE BASE (SUP)
(GUIDE ROLLER)

ALIGNMENT TAPE

JIG CONNECTOR CABLE
MAIN CN25 - JIG BOARD
12PIN(V_TP_FM)
13PIN(V_FF)

Fig.3-3-4
(1) Remove the Cover (JIG) shown on Fig.3-4-1.
(2) Connect the JIG CONNECTOR CABLE to CN25 on the

MAIN BOARD ASSEMBLY as shown on Fig. 3-2-2.

(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 simulta-

neously 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.

CAUSER BY WRONG HEIGHT
OF SUPPLY GUIDE ROLLER

CAUSED BY WRONG HEIGHT
OF TAKE-UP GUIDE ROLLER

Fig.3-3-5

CORRECT VARIATION OF WAVEFORM

BAD VARIATION OF WA VEFORM

Fig.3-3-6

(11) Through the above steps, confirm that there occur no wrin-

kling 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.

3-4

3.3.4 A/C head height & azimuth

Remove the exterior parts attached to the UPPER CASE
ASSEMBLY so that the screws around the A/C HEAD
ASSEMBLY can be tighten or loosen.

• LOWER CASE ASSEMBLY

• TOP OPE UNIT

• CASE COVER(S),(M) ASSEMBLY

• UPPER CASE (S),(M) ASSEMBLY

• FRONT FRAME ASSEMBLY

NOTE:

In performing adjustment, it is recommended that LOWER
CASE ASSEMBLY and TOP OPE UNIT are attached to the
main body for better operation and safety.
(1) Remove the Cover (JIG) shown on Fig.3-4-1.
(2) Connect the JIG CONNECTOR CABLE to CN25 on the

MAIN BOARD ASSEMBLY.

(3) Connect the channel-1 scope probe to the audio output

(AO_SIG_J) and connect the channel-2 scope probe to PB

CTL.
(4) Playback the alignment tape.
(5) Set the tracking to its center range by pressing the (+) and

(-) tracking controls simultaneously.
(6) Adjust screws A , B and C approximately 45 degrees in the

same direction to obtain maximum audio output and CTL

signal levels.
(7) As a final fine adjustment, adjust screw B for minimum sig-

nal level fluctuation and screw C for maximum output sig-

nal level

3.3.5 Phase of control head (X value)
Note:

Remove the exterior parts attached to the UPPER CASE
ASSEMBLY so that the screws around the A/C HEAD
ASSEMBLY can be tighten or loosen.

(1) Connect the JIG CONNECTOR CABLE to CN25 on the

MAIN BOARD ASSEMBLY.

(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. 3-3-9.

(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. 3-3-9).

(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

.

SCREW A

A/C HEAD

Fig.3-3-7

Fig.3-3-8

SCREW C

SCREW B

Audio
signal

Control
pulse
signal

SCREW D

SCREW E

Fig.3-3-8

A

FM OUTPUT

DIRECTION OF CAPSTAN

ADJUSTING
POINT

A/C HEAD PHASE

B

MAX

ZERO

DIRECTION OF DRUM

Fig.3-3-9

3.4 ELECTRICAL ADJUSTMENT

3.4.1 ELECTRICAL ADJUSTMENT WITH PERSONAL COM­PUTER

• Electrical adjustment except for B/W VF ASSEMBLY is per-

formed by using PERSONAL COMPUTER. As for the cable
connection, see Fig. 3-1-1. Read README.TXT file to use the
software for SERVICE SUPPORT SYSTEM properly.

• Remove the COVER (JIG) to perform adjustment.

NOTE:

For the connection of the JIG CONNECTOR CABLE, refer to
Fig.3-1-1.

3-5

VICTOR COMPANY OF JAPAN, LIMITED

12,3-chome,Moriya-cho,Kanagawa-ku,Yokohama,Kanagawa-prefecture,221-8528,JapanAV & MULTIMEDIA COMPANY.

Printed in Japan

0305 VP