SHARP VLWD250, VLWD250U, VLWD450U Service Manual

SERVICE MANUAL

VL-WD250U
VL-WD450U

SERVICE MANUAL

SY0N4VL-WD250

LIQUID CRYSTAL DIGITAL CAMCORDER NTSC

VL-WD250U

LIQUID CRYSTAL DIGITAL CAMCORDER

1. IMPORTANT SERVICE NOTES ........................................................................................................ 2

2. SPECIFICATIONS.............................................................................................................................. 5

3. PART NAMES ................................................................................................................... ................. 6

4. DISASSEMBLY OF THE SET ............................................................................................................ 7

5. MECHANISM ADJUSTMENT JIGS AND PARTS.............................................................................. 9

6. INSPECTION AND MAINTENANCE

ITEMS AND INTERVALS ................................................................................................................. 10

NTSC

MODELS VL-WD250U/WD450U

7. MECHANICAL ADJUSTMENTS AND CHECKS.............................................................................. 11

8. TAPE RUNNING ADJUSTMENT ..................................................................................................... 14

9. MECHANICAL SECTION ASSEMBLY AND PARTS REPLACEMENT

(DISASSEMBLY AND REASSENBLY) ........................................................................................... 16

10.ADJUSTING THE ELECTRICAL CIRCUITS.................................................................................... 23

11.USEFUL TIPS................................................................................................................................... 42

12.SIGNAL FLOW DIAGRAMS ............................................................................................................. 43

13.BLOCK DIAGRAMS ......................................................................................................................... 46

14.SCHEMATIC DIAGRAMS ................................................................................................................ 52

15.SEMICONDUCTOR LEAD IDENTIFICATION ............................................................................... 118

16.PRINTED WIRING BOARD ASSEMBLIES.................................................................................... 120

17.REPLACEMENT PARTS LIST ....................................................................................................... 149

18.PACKING OF THE SET ................................................................................................................. 170

MODELS

In the interests of user-safety (Required by safety regula­tions in some countries) the set should be restored to its
original condition and only parts identical to those specified
be used.

CONTENTS

VL-WD450U

Page

SHARP CORPORATION

This document has been published to be used for
after sales service only.
The contents are subject to change without notice.

1

VL-WD250U

VTVM

AC SCALE

1.5k ohms
10W

CONNECT TO
KNOWN EARTH
GROUND

TO EXPOSED
METAL PARTS

0.15 µF

TEST PROBE

0.15 µF

SONDE D'ESSAI

VERS PIECES
METALLIQUES
EXPOSEES

VTVM

ECHELLE CA

1.5KOHMS
10W

CONNECTER A
UNE MASSE DE
TERRE CONNUE

VL-WD450U

1. IMPORTANT SERVICE NOTES

BEFORE RETURNING THE VIDEO CAMERA
RECORDER

Before returning the video camera recorder to the user,
perform the following safety checks.

1. Inspect all lead dress to make certain that leads are
not pinched or that hardware is not lodged between
the chassis and other metal parts in the video camera
recorder.

2. Inspect all protective devices such as non-metallic
control knobs, insulating materials, cabinet backs,
adjustment and compartment covers or shields, isola­tion resistor/capacitor networks, mechanical insula­tors etc.

3. To be sure that no shock hazard exists, check for
leakage current in the following manner.

· Plug the AC line cord directly into a 120 volt AC outlet
(Do not use an isolation transformer for this test).

· Using two clip leads, connect a l.5k ohm, 10 watt resistor
paralleled by a 0.15µF capacitor in series with all
exposed metal cabinet parts and a known ground,
such as a water pipe or conduit.

· Use a VTVM or VOM with 1000 ohm per volt, or higher
sensitivity or measure the AC voltage drop across the
resistor (See Diagram).

· Move the resistor connection to all exposed metal
parts having a return path to the chassis (antenna

connections, metal cabinet, screw heads, knobs and
control shafts, etc.) and measure the AC voltage drop
across the resistor. Reverse the AC plug (a non
polarized adaptor plug must be used but only for the
purpose of completing these checks) on the set and
repeat the AC voltage measurements for each ex­posed metallic part. Any reading of 0.45V rms (this
corresponds to 0.3mA rms AC.) or more is excessive
and indicates a potential shock hazard which must be
corrected before returning the video camera recorder
to the user.

AVANT DE RENDRE LE MAGNETOSCOPE
Avant de rendre le magnétoscope à l’utilisateur, effectuer

les vérifications de sécurité suivantes.

1. Vérifier toutes les gaines de fil pour être sûr que les fils
ne sont pas pincés ou que le matériel n’est pas coincé
entre le châssis et les autres pièces métalliques dans le
magnétoscope.

2. Vérifier tous les dispositifs de protection tels que les
boutons de commande non métalliques, les matériaux
d’isolement, le dos du coffret, les couvercles de
compartiment et ajustement ou les boucliers, les
réseaux de résistance / condensateur d’isolement,
Ies isolateurs mécaniques, etc.

3. Pour être sûr qu’il n’y a aucun risque de choc électrique,
vérifier le courant de fuite de la maniére suivante.

· Brancher le cordon d’alimentation secteur directement
dans une prise de courant de 120 volts. (Ne pas
utiliser de transformateur d’isolement pour cet essai).

· Utiliser deux fils à pinces et connecter une résistance
de 10 watts 1,5 kohm en parallèle avec un
condensateur de 0,15 µF en série avec des pièces du
coffret métallique exposées et une masse de terre
connue telle qu’un tuyau ou un conduit d’eau.

· Utiliser un VTVM ou VOM avec une sensibilité de
1000 ohms par volt ou plus ou mesurer la chute de
tension CA entre la résistance (voir diagramme).

· Déposer la connexion de la résistance à toutes les
pièces métalliques exposées ayant un parcours de

1. NOTES DE SERVICE IMPORTANTES

retour au châssis (connexions d’antenne, coffret
métallique, tétes de vis, boutons et arbres de commande,
etc.) et mesurer la chute de tension CA entre la résistance.
Inverser la fiche CA (une fiche intermédiaire non polarisée
doit être utilisée à seule fin de faire ces vérifications.) sur
l’appareil et répéter les mesures de tension CA pour
chaque piéce métallique exposée. Toute lecture de
0,45 V rms (ceci correspond à 0,3 mA rms CA) ou plus
est excessive et signale un danger de choc qui doit être
corrigé avant de rendre le magnétoscope à son
utilisateur.

2

VL-WD250U
VL-WD450U

WARNING :TO REDUCE THE RISK OF FIRE OR ELECTRIC SHOCK, DO NO T EXPOSE

THIS APPLIANCE TO WET LOCATIONS.

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

CAUTION: TO REDUCE THE RISK OF ELECTRIC

SHOCK. DO NOT REMOVE COVER. NO
USER·SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL.

This symbol warns the user of uninsulated
voltage within the unit that can cause danger­ous electric shocks.

This symbol alerts the user that there are
important operating and maintenance instruc­tions in the literature accompanying this unit.

CAUTION

This symbol mark means following.
For continued protection against fire haz­ard, replace only with same type fuse.
(CP1; 1.2A 72V, CP3; 1.2A 72V)

Camcorder

only

ATTENTION:POUR REDUIRE LES RESQUES D'INCENDIE OU DE CHOC ELECTRIQUE,

NE PAS EXPOSER CET APP AREIL A LA PLUIE OU A L'HUMIDITE.

ATTENTION

RISQUE DE CHOC ELECTRIQUE

NE PAS OUVRIR

ATTENTION: AFIN DE REDUIRE LES RISQUES DE

CHOC ELECTRIQUE, NE PAS RETIRER LE
COUVERCLE, AUCUN ORGANE INTERNE
NE PEUT ETRE REPARE PAR
L'UTIUSATEUR, CONFIER L'APPAREIL A
UN DEPANNEUR QUALIFIE.

Ce symbole signale à l'utilisateur la présence
d'une tension non isolée à l'intérieur de l'appareil
qui peut être la cause de secousses électriques
dangereuses.

Ce symbole avertit l'utilisateur que des in­structions importantes relatives à l'utilisation
et àl'entretien se trouvent dans le manuel
accompagnant l'appareil.

ATTENTION

Ce symbole signifie que l'on devra uti­liser un fusible de même type (CP1; 1,2A
72V, CP3; 1,2A 72V) pour assurer la
sécurité.

Camcorder

seulement

3

VL-WD250U
VL-WD450U

CAUTION

BEFORE BATTERY DESTROY

NICKEL-CADMIUM BATTERY

The following program is available in the United States. Please consult local environmental
authorities concerning the availability of this or other programs in your area.

The RBRCTM Seal

SHARP participates in the RBRCTM* Nickel-Cadmium Battery Recycling Program in the United
States. The RBRCTM Seal on our battery pack contained in our product indicates that SHARP is
voluntarily participating in an industry program to collect and recycle these batteries. The RBRCTM
program provides you with a convenient alternative to placing spent Nickel-Cadmium battery packs into
the trash or municipal waste stream, which is illegal in some areas. At the end of their useful life, the
Nickel-Cadmium battery can be dropped off at the nearest collection center for recycling. For information
on the nearest collection center, call 1-800-8-BATTERY or your local recycling center. If you are located
outside the United States, contact your local authorities for information concerning proper disposal and/
or recycling of this battery. SHARP’s involvement in this program is part of our commitment to protecting
our environment and conserving natural resources.
[Footnote] *RBRCTM is trademark of the Rechargeable Battery Recycling Corporation.

NICKEL-METAL HYDRIDE BATTERY

LITHIUM or LITHIUM-ION BATTERY
SEALED LEAD BATTERY

Battery disposal
Contains the above (Rechargeable) Battery. must be recycled or disposed of properly.
Remove the Battery from the products and contact Federal or State Environmental Agencies for
information on recycling and disposal options.

4

2. SPECIFICATIONS

Signal System: NTSC standard

Recording System: 2 rotary heads, helical scanning system

Cassette: Digital VCR Mini DV video cassette

Recording/Playback Time: 90 minutes (DVM60, LP mode)

Tape Speed: SP mode: 18.812 mm/second

LP mode: 12.555 mm/second

Pickup Device:1/4" (6.4 mm, effective size: 4.5 mm) CCD image sensor

(with approx. 460,000 pixels including optical black)

Lens: 26 × optical/780 × digital power zoom lens (F1.6, f=3.5-91.0 mm), full-range auto

focus

Lens Filter Diameter: 37 mm

Viewfinder: Electronic LCD color viewfinder

Monitor: 2.5" (6.3 cm) full-color LCD screen (TFT active matrix)

Microphone: Electret stereo microphone

Color Temperature Compensation: Auto white balance with white balance lock

Minimum Illumination: 1 lux (9 lux measured by EIA standard)(with gain-up, F1.6)

Still Image Compression

System/Recording Format: VL-WD450U: JPEG base line conformance/JPEG (Exif2.1)

Still Image Recording Medium: VL-WD450U: 3.3V type SmartMediaTM card (SSFDC)

Power Requirement: DC 7.4 V

Power Consumption: 4.0 W (during camera recording using the viewfinder in Full Auto mode with zoom

motor off)

4.8 W (during camera recording using the LCD monitor in Full Auto mode with
zoom motor off and backlight in normal mode)

Operating Temperature: 32°F to 104°F (0°C to +40°C)

Operating Humidity: 30% to 80%
Storage Temperature: –4°F to 140°F (–20°C to +60°C)
Dimensions (approx.): 3 11/16" (W) × 4 21/32" (H) × 7 11/32" (D)

[93.7 mm (W) × 118 mm (H) × 186.5 mm (D)]

Weight (approx.): VL-WD250U: 1.57 lbs (710 g)

VL-WD450U: 1.58 lbs (715 g)
(without battery pack, lithium battery, video cassette and lens cap)

VL-WD250U
VL-WD450U

AC Adapter/Battery Charger

(UADP-0321TAZZ)(VL-WD250U/WD450U)

(UADP-0328TAZZ)(VL-WD250UK/WD450UK)

Power Requirement: AC 110-240 V, 50/60 Hz

DC Output: 7.3 V

Power Consumption: 23 W

Dimensions (approx.): 2 23/32" (W) × 1 11/16" (H) × 4 7/16" (D)

[69 mm (W) × 43 mm (H) × 113 mm (D)]

Weight (approx.): 0.35 lbs (160 g)

SmartMediaTM Card (Supplied Accessory)

(VL-WD450U Only)

Memory Capacity: 8 MB

Memory Type: NAND flash EEP-ROM

Power Requirement: 3.3 V

Operating Temperature: 32°F to 104°F (0°C to +40°C)

Storage Temperature: –4°F to 149°F (–20°C to +65°C)

Specifications are subject to change without notice.

SERVICE INFORMATION (For the U.S.)

For the location of the nearest Sharp Authorized Service, or to obtain product literature, accessories,
supplies or customer assistance, please call 1-800-BE SHARP (1-800-237-4277) or visit SHARP's
website (http://www.sharp-usa.com)

5

VL-WD250U

S-VIDEO socket

VIDEO jack

AUDIO L jack

AUDIO R jack

STILL button

Power Zoom Wide angle/
Telephoto control/VOLume control

Jack cover

RECord START/STOP button

Power switch (CAMERA/VCR
select switch)

Shoulder strap
loop

Cassette compartment door

Cassette compartment door release

PC connection jack

DV terminal

EarPHONES jack

Jack cover

Speaker

Hand strap

Right view

VL-WD450U

3. PART NAMES

For details on the use of each control.

Left view

(VL-WD250U)

Remote sensor

Stereo microphone

LCD monitor
OPEN release
button

W/B (White Balance) button

CAT'S EYE switch

Lens hood

Zoom lens

Left view

LCD monitor

GAMMA/BRIGHTER button

AUTO ON/OFF button

MENU/DISPLAY button

DIS (Digital Image Stabilization) switch

Viewfinder
Zoom microphone
mounting hole

Operation button

Diopter adjustment

Power source
PUSH release
button

Power source
mounting surface

Left view

(VL-WD450U)

W/B (White Balance) button/
IR (Infrared) LIGHT button

SUPER CAT'S EYE switch

Lens hood

Zoom lens

Infrared light transmitter/
Remote sensor

Stereo microphone

GAMMA/BRIGHTER button

AUTO ON/OFF button

Operation button

MENU/DISPLAY button

Media Selection switch (TAPE/CARD
selection switch)

Bottom view

(VL-WD250U)

(VL-WD450U)

Card slot cover

Lithium battery
compartment door

Shoulder strap loop

Tripod socket

Tripod socket

6

4. DISASSEMBLY OF THE SET

LCD FPC 1, 2

Joint main FPC

Turn SW connector

(d)

(d)

Note:

Before removing the cabinet, turn off the power supply, and ascertain that the battery have been removed.

VL-WD250U
VL-WD450U

1.

(d)

(d)

(d)

1) Remove the screws ((c)XiPSF17P04000)(5 pcs.) and ((b)LX­HZ0063TAFF)(1 pc.) on the bottom cover to remove the bottom
cover.

2) The screws ((d)XiPSN17P04000)(2 pcs.), ((b)LX-HZ0063TAFF)(1
pc.) and ((e)LX-HZ0063TAFN)(1 pc.) on the front cover, and open
the front cover. Then disconnect the connector of the microphone.

3) Remove the screws ((d)XiPSN17P04000)(3 pcs.) fixing the shoe
angle to remove the shoe angle. Remove the connector of the
zoom microphone which is located in the front, and then slide the
top side cover forward and lift it up to remove it.

(e)

(b)

(b)

(c)

3.

1) Disconnect the connector of the turn SW.

2) Remove the joint main FPC.

3) Remove the LCD FPCs (2 sheets), and lift up the cabinet B ass'y.

4.

Operation PWB
connector

(b)

2.

(d)

(b)

(d)

(c)

(b)

1) Turn the V/F, and then remove the screws ((b)LX-HZ0063TAFF)(7

pcs.) and ((c)XiPSF17P04000)(1 pc.) fixing the battery cover.
Disconnect the connector of the battery terminal on the bottom.

2) Remove the screws ((d)XiPSN17P04000)(4 pcs.) on the top

side and the screw ((d)XiPSN17P04000)(1 pc.) on the side.

(b)

(b)

1) Remove the screws ((b)LX-HZ0063TAFF)(5 pcs.) to remove
the joint PWB.

2) Disconnect the connector of the operation PWB.

3) Remove the screws ((b)LX-HZ0063TAFF)(3 pcs.) to remove
the operation PWB.

5.

1) Disconnect the connectors (2 pcs.) of the lens, remove the
screw ((d)XiPSN17P04000)(1 pc.), and lift it up.

2) Disconnect the connector of the V/F, remove the screw ((d)
XiPSN17P04000)(1 pc.), and lift up the V/F unit to remove it.

7

VL-WD250U

(l)

(l)

(a)

(d)

(c)

(d)

(d)

(c)

(`)

(`)

VL-WD450U

6.

(c)

(c)

1) Disconnect the B TO B connector of the DV main FPC,
disconnect the front and rear FPC connectors, and remove the
screws ((c)XiPSF17P04000)(2 pcs.) to remove the main PWB.

7.

(b)

(b)

9.

1) Remove the screw ((a)LX-BZ0221TAFC)(1 pc.) to remove
the cassette lid.

10.

(d)

(d)

(c)

(b)

1) Remove the screws ((b)LX-HZ0063TAFF)(5 pcs.), and re­move the mechanism together with the mechanism PWB
fitting angle.

8.

(b)

(b)

1) Remove the screws ((b)LX-HZ0063TAFF)(2 pcs.) to remove
the speaker cover.

2) Disconnect the connector of the speaker to remove the speaker.

3) Remove the screws ((d)XiPSN17P04000)(2 pcs.) and the screw
((c)XiPSF17P04000)(1 pc.), and remove the DV terminal PWB
together with the stay front ass'y.

11.

1) Remove the screws ((l)LX-HZ0017TAFF)(2 pcs.) to remove
the LCD ass'y.

12.

1) Remove the screws ((b)LX-HZ0063TAFF)(3 pcs.) to remove
the zoom switch unit and AV terminal.

1) The shaft (` section) of the LCD tilt unit is rotated in the arrow
direction 90°.

2) Turn the LCD tilt unit so as to verticalize it to the LCD cabinet.

3) Remove the fixing screws ((c)XiPSF17P04000)( 2 pcs.) and
((d)XiPSN17P04000)(3 pcs.).

8

5. MECHANISM ADJUSTMENT JIGS AND PARTS

5-1. Mechanism check adjustment jigs

<Note: The entries of list>

VL-WD250U
VL-WD450U

Configuration

1. Name

2. Part No.

3. Code
* Model, Uses Remarks

1. PB-use cassette
Torque meter

2. 9DASD-1015

3. DB
* 1mN·m/1.5mN·m

50 or more

ø2

No. 0 cross-bit
No. 00 cross-bit

1. Torque screwdriver
150mN·m

2. JiGTD1500RTDH

3. CB

1. Torque gauge

2. JiGTG0045

3. CN
*

For use in VS-REW wind-

ing torque measurement.

1. Master plane

2. 9EQMP-VLPD1

3. CL
* For checking reel base

height.

1. Torque gauge head

2. 9EQTGH-DH5000

3. BW
* For use with the follow-

ing torque gauge.

1. Height adjustment jig

2. 9DAHG-PD1

3. BZ
* For height adjusting.

1. Tension gauge 4N

2. JiGSG0400

3. BK
* For measurement of
pinch roller pressure.

1. Height adjustment
screwdriver

2. 9EQDRiVER-DH5

3. BC
*

For guide roller adjustment.

<Miscellaneous>

(1) Slide caliper
(2) Precision screwdrivers

1. Alignment tape – ( I )

2. VR3-GAZXS

3. CF

*

For tape running

adjustment.

1. Alignment tape – ( II )

2. VR3-GTZQS

3. CG
*

For SW point adjustment.

* 90ADVC-TAPE can use,

too.

1. For hexagon nut
opposite side 3mm bit.

2. 95CM22001

3. BL
* For S guide hexagon
nut installation.

(Phillips head and slotted)
(3) Radio needle-nose pliers
(4) Tweezers

5-2. Parts for regular periodic inspection and maintenance

1. Oil
Cosmo Hydro HV22

2. 9EQ-Oil-HV22

3. AE
* Cosmo Petroleum K.K.

1. Cleaning paper

2. JiGDUSPER

3. AP
* DUSPER ∑ (SIGMA)
(ozu Co., LTD.)

<How to make jigs for mechanism checking and adjustment>

(1)Reel hub for back tension measurement (Fig. 1)

1) Obtain a commercially available cassette tape reel hub.
(Disassemble the cassette tape and remove the tape from
the reel hub.)

2) Paste one end of a string (about 20cm long) to the reel hub
with (for example) cellophane tape.

3) Paste the weight of about 0.21N on the upper side reel hub.

(2)String for use in pinch roller snap-fit force measurement (Fig. 2)

1) Obtain an approximately 20cm length of commercially available string.

2) Tie the 2 ends together to form a loop.

1. Grease: Moly Coat
YM-103

2. 99FGREASE-YM103
* Dow craning

1. Screw lock (1401B)
* Three Bond

<Note:
The entries of list>

1. Cleaning liquid:
industrial-use ethyl alcohol
* Commercially available item

1. Extremely thin cotton swab
* Commercially available item

Weight

Reel hub

Fig. 1

1. Dial tension gauge

2. 9DAPTG-10-10W

3. CA
* PTG-10

*

For Tu guide adjustment.

*

For T roller adjustment.

*

Bit shape (see figure below).

Tolerance ± 0.1

2

1.4
Tip thickness 0.5

3

Configuration

1. Name

2. Part No.

3. Code
* Model, Uses Remarks

String

String

Fig. 2

9

VL-WD250U
VL-WD450U

6. INSPECTION AND MAINTENANCE ITEMS AND INTERVALS

In order to keep the mechanical section always in good condition, perform the following inspection and maintenance at regular intervals.
In addition, after repair, perform the following maintenance items regardless of how long the user has been using the unit.

6-1. List of inspection and maintenance items

Inspection and

maintenance location

Tape running section (see section 8-3)
Drum section, Video head

(see section 8-3)

Tape running system

Timing belt
Pinch roller
Capstan motor

Swing arm
S reel base, Tu reel base

Center pulley shaft
Intermediate pulley shaft
Swing arm boss

Drive system

Intermediate gear A shaft,
Intermediate gear B shaft

Loading motor
Mode switch

Abnormal noise
PB · VS/R winding torque
PB · VS/R · loading back tension

Tu reel base ratchet torque
S reel base no-load torque

Performance checks

500 1,000 1,500 2,000 3,000

<Rollers>

• Replace if there is anything abnormal in the rotation, or if there is run-out
(that becomes large).

<Other than the above>

• Clean the section that contacts the tape (especially the lower drum helical
section). Use the specified cleaning liquid.

Time of use (h)

[Oil] Cosmo Hydro HV22
[Grease] Moly Coat YM-103

• • • Replace. • • • Clean. • • • Lubricate. • • • Check.
Symptoms that indicate

need for maintenance

• Block-type noise

• Head hole clogging

• Tape damage

• The tape fails to run.

• The tape becomes slack.

• Block-type noise

• Abnormal noise

• Abnormal noise

• Cannot eject.

• Fails to enter a mode.

• The tape fails to run.

• The tape becomes slack.

• Tape damage

• The play-back image is

abnormal.

[Screw lock] Three Bond 1401B
[Cleaning liquid] Industrial-use ethyl alcohol

Note:

Replace the drum ass'y if the
video head is cleaned but the
envelope still does not appear.
(When the envelope is normal,
refer to "11. USEFUL TIPS".)

• Replace if there is anything
abnormal.

• Lubricate with oil.
[Oil]
Cosmo Hydro HV22

Note:

• Replace if anything is abnormal
(including the noise).

• Replace any part that fails to
perform within the standard.

Remarks

Apply oil to the shaft, then
wipe lightly with a cloth.

6-2. Precautions

(1) When replacing any part, always replace the cut washer that was

removed with a new one.

(2) This mechanism does not have control adjustment. If the control

cannot be set as required, clean and or replace parts.

(3)On the oil

a) Always use the specified oil. (Using another kind of oil can cause

various kinds of trouble.)

b) Always use clean oil, without any mixed-in dirt, to lubricate bearings.

(Using oil with dirt mixed in can cause the bearings to wear or to
stick.)

c) One drop of oil is the amount shown in the Fig. 1, on the point of a

pin.

(4)Perform circuit repair, tape running adjustment, etc. with the cassette

controller assembly attached to the mechanism.

(5)When operating the mechanism separately, apply voltage to the

loading motor. However, the terminal voltage must be DC3V~4V.
(When the mechanism is connected to the main PWB, do not apply
external voltage to the loading motor. It may cause a trouble.)
(Forcing the gears to turn by hand entails danger of breakage.)
If the mechanism is separated from the unit, the capstan motor may rub
and be damaged if spacing under the mechanism is inadequate.

(6)To install the cassette controller, push section A in the Fig. 2. Do not

push anything else.

(7)Do not deform any of the mechanical parts.

Oil

1.5mm diameter or less

Fig. 1

10

A

Fig. 2

VL-WD250U
VL-WD450U

7. MECHANICAL ADJUSTMENTS AND CHECKS

The items discussed here relate to general on-site servicing (field servicing). Adjustments and replacements that require
sophisticated facilities, jigs and technology are omitted.
In addition, in order to maintain the characteristics that the unit has when it is new, not only are inspection and maintenance necessary,
but it is absolutely necessary that, for example, the tape not be damaged, and always use jigs for adjustments that require them.

<Precautions>

(1)Always set the power supply and state of the unit as follows Notes for mechanism adjustments and checks.

AC adapter used, with cassette controller assembly
AC adapter used, without cassette controller assembly (Independent Mechanism)
DC3V, without cassette controller assembly (Independent Mechanism)
(2) When the mechanism is connected to the main PWB, do not apply external voltage to the loading motor. It may cause a trouble.

(3) Always run the tape with the cassette controller assembly attached.

7-1. Checking the playback (recording) winding torque AC adapter used, with cassette controller assembly

(1)Set the torque cassette with the cassette controller assembly attached, then, in SP recording mode (playback mode if a signal has

already been recorded in SP mode on the tape), confirm that the torque on the winding side is within the standard.

<Winding torque standard in record (playback) mode>

(If there is torque ripple, read the center value.)

0.70 +0.4/-0.3mN·m, ripple 0.5mN·m or less

7-2. Checking the rewinding playback (VS-REW) winding torque

AC adapter used, without cassette controller assembly (Independent Mechanism)

(1)Remove the cassette controller assembly, press the DOWN switch, using the

adhesive tape and referring to 9-3, operate in the TEST mode (T01) to rewind,
and set the rewinding playback (VS-REW) mode.

(2)Set the torque gauge on the S reel base, press the front end of tension post with

your finger in the arrow A direction so as to ascertain that the winding torque is
as specified. (Check without rotating the torque gauge.)

<Rewinding playback (VS-REW) winding torque standard>

(If torque ripple exists, read its center value.)

1.6 ± 0.6mN·m, ripple 0.6mN·m or less
(3)After checking the winding torque remove the torque gauge, and remove the

adhesive tape used in item (1) above (refer to 9-3). The STANDBY mode is set
automatically.

Fig. 1. Removal of tension band when

measuring the rewinding play­back (VS-REW) winding torque

7-3. Checking of reel base height DC3V, without cassette controller assembly (Independent Mechanism)

(1)Remove the cassette controller assembly (refer to 9-2).
(2)Referring to 9-1, apply DC3V to the loading motor and put the system into playback mode.
(3)Taking adequate care so that the master plane does not contact drum, running parts (guide roller, etc.), or the MIC contacts. Fit

the master plane holes to the 2 guides (A and B) in Fig. 2.

(4)Confirm that the heights of the S reel base reel receiving surface and the Tu reel base reel receiving surface below the master plane

top surface are within the set values, using, for example, a slide calliper (Fig. 3).
When checking the S reel base height, press the front end of tension post in the arrow A direction with your finger to release the

tension band, and then check the height in this state (Fig. 1).
(5)If the height is not within set values, replace the washer under the reel base, and adjust as specified.
Note: After the adjustment, make sure that the reel bases rotate smoothly.

Reel receiving
surfaces

2.4 ± 0.1

2.4 ± 0.1

Reel base height

setting values

Reel base height

Fig. 3

11

A

setting values

MIC contacts

Fig. 2

B

VL-WD250U
VL-WD450U

7-4. Back tension torque check and adjustment in record (playback) mode

AC adapter used, with cassette controller assembly

(1)Checking

Set the torque cassette (SD-1015), and make sure in the SP record mode that
the supply side torque is within the standard shown below (or in the playback
mode for the tape on which the signal has been SP-recorded).

<Standard>
(If torque ripple exists, read its center value.)

0.7 ± 0.1mN·m

(2)Adjustment (Fig. 4)

If the value is out of standard range, adjust, using the screw 1 shown in Fig. 4.

1. Loosen the screw 2 slightly.

2. Adjust to turning the screw 1. When back tension is too high, turn the screw
1 counterclockwise (CCW).

When back tension is too low, turn the screw 1 clockwise (CW).

3. After adjustment fix the angle with the screw 2. (At this time take care so as
to prevent excessive tightening.) Apply Screw Lock to the screw 1.

<Caution>

Screw tightening torque: 0.04N·m

7-5. Checking and adjustment of tension roller position in
record (playback) mode

DC3V, without cassette controller assembly (Independent Mechanism)

(1)Checking

Before winding the 60-min tape make sure that the tension roller is in the same
position as S guide as shown in Fig. 4.
If not, take out the tape and adjust in the following procedure.

(2)Adjustment (Fig. 5)

1. Set the playback mode without loading the tape.

2. Loosen the screw 3 slightly (to such an extent that the tension band holder
4 can be moved).

3. If the tension roller is inside from the specified position, shift the tension
band holder 4 in the arrow
the tension band holder in the arrow

(Proper shift must be 0.2 to 0.6mm outside from the specified position.)

4. Check the position by the procedure described in item (1) Checking above.

5. If the position is not specified position, adjust again.

direction. If the tension roller is outside, shift

A

direction, and fix with the screw 3.

B

Screw2

Screw1

Apply screwlock

Fig. 4. Check (tape exists)

Tension roller position (S guide standard)

0.2~0.6mm (Standard)
Tension roller

Tension roller position (S guide standard)

0 ± 0.3

CCW

CW

S guide

Tension band holder 4

Screw 3

7-6. Checking of supply S reel base no-load torque

DC3V, without cassette controller assembly (Independent Mechanism)

(1)Remove the cassette controller assembly, then apply DC3V to the loading

motor and put the system into L. start mode (refer to 9-1).

(2)Move the swing arm toward the Tu reel base side.

Be careful not to cause damage to the gears and other parts in the process. (Fig.

6)
(3)Set a back tension measurement reel hub on the S reel base.
(4)Using a dial tension gauge, pull the string in the A direction, then confirm that the

tension is within the standard.

<FF back tension standard>

(If the tension fluctuates, read its center value.)

30mN or less

7-7. Checking of loading back tension

DC3V, without cassette controller assembly (Independent Mechanism)

(1)Remove the cassette controller assembly, then apply DC3V to the loading

motor and put the system into L. start mode.
(refer to 9-1)
(2)Move the swing arm toward the S reel base side. Be careful not to cause

damage to the gears and other parts in the process. (Fig. 7)
(3)Set a back tension measurement reel hub on the Tu reel base.
(4)Using a dial tension gauge, pull the string in the A direction, then confirm that

the tension is within the standard.

Fig. 5. Position adjustment
(tape does not exist)

Move the swing arm

A

toward the Tu reel
base side.

Fig. 6. S reel base no-load torque

measurement method

12

<REW back tension standard>

(If the tension fluctuates, read its center value.)

15 ± 12mN

7-8. Checking of winding Tu reel base ratchet torque

DC3V, without cassette controller assembly (Independent Mechanism)

(1)Remove the cassette controller assembly, then apply DC3V to the loading

motor and put the system into standby mode. (refer to 9-1)

(2)Move the swing arm toward the S reel base side.

Be careful not to cause damage to the gears and other parts in the process.

(Fig. 8)
(3)Set a back tension measurement reel hub on the Tu reel base.
(4)Using a dial tension gauge, pull the string in the A direction, then confirm that

the tension is within the standard.

<Winding Tu reel base ratchet torque standard >

(If the tension fluctuates, read its center value.)
100mN or less

7-9. Checking of rewinding playback (VS-REW) back

tension

DC3V, without cassette controller assembly (Independent Mechanism)

(1)Remove the cassette controller assembly, then apply DC3V to the loading

motor and put the system into rewinding playback (VS-REW) mode. (refer to

9-1)
(2)Move the swing arm toward the S reel base side.

Be careful not to cause damage to the gears and other parts in the process.
(3)Set a torque gauge on the Tu reel base.
(4)Turning the torque gauge to counterclockwise (1 turn for 3 seconds), then

confirm that the torque is within the standard.

<Rewinding playback (VS-REW) back tension standard value>

(If the tension fluctuates, read its center value.)

0.70 +0.7/-0.3mN·m

VL-WD250U
VL-WD450U

Move the swing arm
toward the S reel
base side.

Fig. 7. Loading back tension measurement

method

A

7-10.Checking of pinch pressing force

DC3V, without cassette controller assembly (Independent Mechanism)

(1) Set the pinch roller pressing force measuring thread on the pinch lever

(position A , Fig. 9).
(2)Set the mechanism to the playback mode, press the pinch roller against the

capstan axis.
(3)Fit the tension gauge to the pinch roller pressing force measuring thread, pull

in the arrow B direction shown in Fig. 11 to separate a little the pinch roller from

the capstan axis.
(4)Gradually return the pinch roller, and when the pinch roller contacts parallel

the capstan axis, read the value (see Fig. 10) to make sure that the value

conforms to the standard shown below.

<Standard>

1.8 +0.3/-0.5N

<Caution>

After making this measurement, quickly release the system from playback
mode and remove the pinch roller from the capstan shaft. (If the pinch roller
is left fitted onto the capstan shaft for a long time, the pinch roller will be
deformed.)

A

OK

NG

Move the swing arm
toward the S reel
base side.

A

Fig. 8. Winding Tu reel base ratchet torque

measurement method

Pinch roller

Right guide

Capstan shaft

B

Fig. 9

Fig. 10

Fig. 11

13

VL-WD250U
VL-WD450U

8. TAPE RUNNING ADJUSTMENT

8-1. Adjustment locations

<Replacement parts>

· T roller, arm

· Tu guide, arm

· Slide chassis

<Replacement parts other
than those shown above>

· S guide

· Pole base

· Guide roller

· Drum assembly

· Capstan motor, etc.

Adjust the height of only
replaced parts with the
adjusting jig.
Adjustment procedure 8-2

Height presetting is not
necessary.

Cassette controller
installation

Running adjustm­ent preparation
Adjustment
procedure 8-3

Running rough
adjustment
Adjustment
procedure 8-4

Running final
adjustment
Adjustment
procedure 8-5

8-2. Running height adjustment

· After replacement of T roller or Tu guide adjust the height . (Adjust only the replaced parts.)

· After height adjustment do not turn the T roller. If crease is found on the tape of Tu guide, remove the crease by rotating.
(As for details refer to the “Running rough adjustment”.)

· After height adjustment of T roller or Tu guide, apply Screw lock to an end of shaft.

(After replacement of S guide apply Screw lock to same point, too.)

Tu guide

T roller

Height setting
jig

Lower edge
fitting

Master plane

Fit height the par on low edge fitting.
After setting adjustment jigs, turn T roller
and S guide counterclockwise to 225°.

Master plane

Height setting
jig

Height setting
jig

Master plane

8-3. Preparation for tape running adjustment

Meters, jig… Oscilloscope, Adjustment remote control, Height adjustment screw driver, Alignment tape (for tape running

adjustment, for switch point adjustment), Master plane, Height adjustment jig.

<Method and description>

(1)Clean the tape running surface (especially, adequately clean

the drum surface and the lower drum helicam surface).
(2)Attach the cassette controller.
(3)Connect an oscilloscope to each TP on the relay circuit board.
(4)Turn the AC adapter power ON.
(5)Using the adjustment remote control unit, put the system TEST

mode T-05.
(6)Replay the alignment tape for running adjustment, and make

sure that the tape is running in the SP mode.
(7)Check the oscilloscope playback envelope, then, at +1/4 shift

and -1/4 shift, check whether all of it is flat. If it is not, perform

the following adjustment so that it becomes flat.

(Each time you push the PLAY key, the shift will change;

+1/4 shift → Normal → -1/4 shift → Normal , in order.)

Sup guide roller

Tension roller

Drum

S guide

Tu guide roller

Tu guide

Pinch roller

Reels

14

8-4. Running rough adjustment

(With cassette controller)

VL-WD250U
VL-WD450U

1) Su, Tu guide roller height adjustment
<Method and description>

(1)Loosen the guide roller lock screw, then tighten loosely so that

the roller turns easily.

(2)Replay an alignment tape, and adjust the Sup, Tu guide roller

so that the envelope sides of entrance and exit are flat.

(3)Perform ± 1/4 shift, then, as in the above case, adjust until the

envelope becomes flat.

* If running is difficult for the entrance changed, turn the T roller

to counter clockwise 180°. (refer to Fig. 1)

2) Check of V/SR envelope wave form

<Method and description>

(1)Confirm that the envelope waveform peaks in V/SR mode are

uniform.

(2) If they are not uniform, fine-adjust the guide roller and the Tu

guide.

3) Check of tape wrinkles

<Method and description>

(1)Check that the tape is not distorted between the Tu guide and

pinch in the PB mode and the V/SR mode.

-If crease is found, make an adjustment in the range of ±180°.

-After adjustment apply Screw Lock.

NG

±1/4 shift ±1/4 shift

Entrance side

Turn to 180°

Exit side

Normal

T roller

Fig. 1

Adjust so that A B.

A

Pinch roller

B

Wrinkles

Tu guide

Deformation

Deformation

NG

•

•

4) Check the rising time of the envelope wave form
<Method and description>

(1)Check the rising time of the envelope when switching from V/SR mode to PB mode. (Within 5 sec)
(2)Check the rising time of the envelope when switching from STOP mode to PB mode. (Within 5 sec)

8-5. Final running adjustment

(With cassette controller)

1) Adjustment of Sup and Tu guide roller height
<Method and description>

(1)Perform ± 1/4 shift, then if the envelope wave's ratio of MAX.

to MIN. are 60% or less, adjust again the height of guide roller.

(Refer to Fig. 2)
(2)Finally adjust the lock screw of Sup and Tu guide roller.
(3)Once perform unloading and then loading to set the PB mode,

and make sure that the envelope waveform does not change.

2) Adjustment of playback SWP
<Method and description>

(1)Playback the alignment tape for switch point adjustment.
(2)Perform SWP automatic adjustment with adjustment remote control.

Fig. 2

* When replacing the mechanism and drum, adjust the phase and equalizer using the adjustment remote control.
(Refer to "10. ADJUSTMENT THE ELECTRICAL CIRCUIT".)

15

VL-WD250U
VL-WD450U

9. MECHANICAL SECTION ASSEMBLY AND PARTS REPLACEMENT
(DISASSEMBLY AND REASSEMBLY)

Mechanical section disassembly and reassembly are explained in this section.
For removal of the cabinet, etc., refer to 4. DISASSEMBLY OF THE SET.

<Precautions>

1. Always replace cut washers that have been removed, for example in parts replacement, with new ones.
When reassembling, be careful not to allow screws, washers or foreign matter to enter. They can cause mechanical misoperation.

2.

3. Use the cleaning liquid, oil, grease and screw lock that are specified below. Use of any other kind can cause mechanical
misoperation.
Oil: Cosmo Petroleum : Cosmo Hydro HV22 Screw lock: Three Bond :1401B
Grease: Dow Corning : Moly Coat YM-103 Cleaning liquid: Industrial-use ethyl alcohol

9-1. On the mechanical modes

When operating the mechanism separately, apply DC3~4V to the loading motor.
(When the mechanism is connected to the main PWB, do not apply external voltage to the loading motor. It may cause operational problems.)

(1) EJECT mode

The mechanism position to take out the cassette where the
EJECT lever is extremely shifted in the A direction. (It is impos­sible to lock the cassette controller assembly in this mode.)

EJECT lever

A

EJECT mode diagram

(3)LOADING START mode

This is the mode where the tape is wound around the winding
reel when a cassette with visible wind start leader tape is
loaded. (The brake shifter moves to the left, the S main brake
is separated from the S reel base and the Tu main brake is
separated from the Tu reel base.)

(2)STANDBY mode

The mechanism position to set the cassette where the slide
chassis is at the farthest position from the drum and the
EJECT lever is in clockwise rotated position (position where
the cassette controller assembly can be locked).

EJECT lever

Rotation

It is hardly seen since
it is concealed with
slide chassis.

Slide chassis

STANDBY mode diagram

(4)REWINDING (VSR) mode

The mechanism position to rewind the tape (fast rewinding
playback). The S and T pole base is pressed, the pinch roller
is pressed to the capstan axis, the brake shifter VSR brake
section engages with the Tu reel base gear.

T pole base

S pole base

Capstan shaft

Pinch roller

S reel base

S main brake

Brake shifter

LOADING START mode diagram

VSR brake section

Tu reel base

Tu reel base

Tu main brake

REWINDING (VSR) mode diagram

16

(5)PLAYBACK (RECORD, FF, VSF) mode

The mechanism position for playback, record, FF and fast
feed playback.
The pinch roller is pressed to the capstan axis, and the S/Tu
main brake is separated from the S/Tu reel base.

VL-WD250U
VL-WD450U

(6)STOP mode

The system is in the STOP (Rec Lock in CAMERA mode)
position; the S and the T pole bases are snap-fitted to the drum
base, the S brake is in contact with the S reel base, and the Tu
brake is in contact with the Tu reel base.

S reel base

S main brake

Pinch roller

Capstan shaft

Tu reel base

Tu main brake

(Not visible)

S pole base

S reel base

S main brake

T pole base

PLAYBACK mode diagram

(RECORD, FF, VSF)

STOP mode diagram

9-2. Cassette controller assembly

<Removing>
(1) Apply DC3V to the loading motor to enter the standby mode.

Press the lock lever in the arrow direction to raise the cassette controller. (See Fig. 1; A or B direction.)
(2) Turn the damper lever in the arrow
(3) Remove two screws

, and remove the down guide D in the arrow

E

Take care that the slide chassis is provided with the down guide positioning G or H.
(4) Slide the cassette controller in the arrow

and turn the cassette controller in the arrow
(5) Slide the cassette controller in the arrow

direction to release the engagement of the damper bar. (See Fig. 2.)

C

direction, remove the outer link shaft (both sides) toward the inside of the mechanism,

I

direction. (See Fig. 5.)

J

direction. (See Fig. 6.)

K

direction. (See Figs. 3 and 4.)

F

Tu reel base

Tu main brake

<Installing>
(1) Apply DC3V to the loading motor to enter the standby mode.
(2) For assembly, reverse the removing procedure (5) thru (2).

Tightening torque of two screws

Fig. 1.

: 40±4mN.m

E

Fig. 3.

Fig. 2.

Fig. 4.

Fig. 5.

Fig. 6.

17

VL-WD250U
VL-WD450U

9-3. How to operate with the circuit board without the cassette controller assembly.

In this method, if the procedure is followed incorrectly there is danger of damaging the mechanism and the tape, so except in special
cases, such as when measuring the VSR torque, do not perform this procedure. Normally operate this unit with the cassette controller
assembly attached.
Be sure to follow each caution mentioned.

(1) Apply DC3 ~ 4V to the loading motor to enter the standby mode.
(2) Securely press the movable piece L of the down SW with

cellophane tape or similar to turn on SW. (Take care that the
movable piece turns only in the shown arrow direction.)

Movable piece
of down SW.

Note: To enter REC mode, press the pin of the recognition switch

.

M

(Unnecessary in other modes.)
(3) Set the test mode (T-01) with the adjustment remote controller

without putting the tape, and the mechanical operation will
become possible with the mode key.

(4) For ejection, remove the tape of (2).

Side view

Rotary di­rection of
movable
piece

Fig. 7. LOADING START mode

9-4. Phase matching

Referring to Figs. 8 and 9, align the phase for the following parts.
(1) Ejection lever (2) Election operation lever (3) Mode SW (4) Main cam (5) Subcam
Note: Before disassembly, sufficiently check the marker position.
Note: When installing the joining gears, verify that the phase aligning holes of the main cam and subcam are aligned to the hole of
the chassis.
Note: After the phase is aligned, turn the mode SW with hand, and verify that it turns nearly one turn.
(After verification, return it to the original position.)

Eject lever
control lever

Eject lever

Phase matching hole
(for chassis)

Phase matching hole
(for gear)

Fig. 8

MODE switch

Phase matching
mark

Phase matching hole
(for chassis)

Main cam

18

Coupling
gear

Fig. 9

Sub cam

Phase matching hole
(for chassis)

9-5. Reassembly

367

315

363

366

311

312

364

365

421

459

C

Capstan FPC cover

H/A PWB angle

F

E

E

T arm control
lever cover

Intermediate gear angle

sub Ass'y
Center pulley
Ass'y

Intermediate pulley
Ass'y

Driving belt

396

308

362

373

454

451

307

395

372

452

I

I

H

H

Guide roller Ass'y

Sup pole base Ass'y

Tu pole base
Ass'y

S loading arm
Ass'y

S pressure spring

S loading gear

Tu loading gear

Tu pressure spring

Tu loading arm Ass'y

Guide rail

G

G

Phase match check

Phase match check

Guide rail sub Ass'y
(Rear surface)

Enter part of
convexity rear
surfacer

Guide rail sub Ass'y

9-5-1. Reassembly in side of the main chassis.

Note) Numbers before part names are given as a guide to the order of assembly.

As for greasing/oiling/cleaning places refer to the attached drawings (Grease/Oil application side of the main chassis).

1.

Pinch control lever

Groove grease

303

Pinch drive lever

361

Main chassis Ass'y(Front surface)

301

4.

VL-WD250U
VL-WD450U

2.

3.

Groove grease

Mode SW

463

EJECT lever

T arm control lever

Loading lever

A-3

A-2

A-1

Main cam

304

EJECT control lever

302

360

309

306

LM/Mode FPC

465

Item

Tightening torque

A S Tight · M1.4 x L3 70mN·m 3

Cam groove grease

Coupling
gear

370

AHC cam

369

Item

Shifter drive lever

B

305

371

Sub cam

Tightening torque

B CWø1.2-ø3.0-t0.25 1

Loading motor Ass'y

461

D

Loading motor
fitting Ass'y

Slide chassis

C

guide

386

Capstan motor

462

C

Quantity

Ass'y

Quantity

Item

Tightening torque

Quantity

C Special screw · 40mN·m 1

M1.4 x L1.6

E S Tight · M1.4 x L4 70mN·m 2

F S Tight · M1.4 x L2 70mN·m 1

5.

G

Special head screw ·
M1.4 x L1.5

Item

Tightening torque

40mN·m 2

Quantity

6.

Groove grease

C Special screw · 40mN·m 2

Item

M1.4 x L1.6
Special screw with step

D

M1.4 x L6.25

Tightening torque

Quantity

· 70mN·m 1

19

Item

Tightening torque

Quantity

H CWø0.7-ø2.2-t0.25 2

I Special screw · 5mN·m 2

M1.2 x L1.8

(Tentative tightening)

VL-WD250U
VL-WD450U

9-5-2. Reassembly in side of the Slide chassis.

Note) Numbers before part names are given as a guide to the order of assembly.

As for greasing/oiling/cleaning places refer to the attached drawings (Grease/Oil application side of the slide chassis)

1.

Slide adjustment
angle

S cassette stay

K

382

Tu pole

381

383

352

Tu guide

Ass'y

arm

393

Tu guide
arm SPR.

Tightening torque

Grease

376

344

Note1)

F

J

Brake shifter
Ass'y

Slide chassis Ass'y

Grease

353

331

Item

T roller upper
flange

T roller bottom
flange

F S Tight · M1.4 x L2 40mN·m 1

H CWø0.7-ø2.2-t0.25 1

J Special screw · 40mN·m 1

M1.2 x L1

Note 1: Use the No. 00 bit.

K

Special head screw ·

40mN·m 1

M1.4 x L2

Sensor FPC cover

502

Damper

466

397

Guide adjustment SPR.

H

Quantity

Spring

2.

T roller upper

382

flange

455

Tension arm Ass'y

354

456

N

T spring
hanging
ANG

356

K

B

Tu main
brake

375

O

411

415

M

T arm SPR.

392

H

N

391

Main brake
SPR.

351

Tu reel base
Ass'y

457

411

O

Main brake SPR.

Fit the main brake SPR from
above, and close with the hook.

Swing arm release
lever fixing screw

Swing arm
release lever

Swing arm
release SPR.

420

357

390

Tension band
Ass'y

S reel base Ass'y

S main brake

374

391

F

L

Note 1: Take care for scratch and hit mark on 381, 382 , 383 , 384 and

455 . Handle the tension band with care against deformation.

Note 2: After lightly tightening 428 arm area against deformation,

apply screw-lock on the tip of the shaft.

384
383

397

Guide adjustment
SPR.

S guide hexagon nut

428

385

S guide sleeve

415

Pinch lever Ass'y

458

Pinch lever

394

return SPR.

H

T roller Ass'y

T roller inner

T roller bottom
flange

Grease

Item

Tightening torque

Quantity
B CWø1.2-ø3.0-t0.25 1
F S Tight · M1.4 x L2 40mN·m 1
H CWø0.7-ø2.2-t0.25 2

Special head screw ·

K

40mN·m 1
M1.4 x L2
Special screw with step

L

· 40mN·m 1
M1.4 x L1
Type 2 minuteness

M

40mN·m 1

M1.4 x L1

N CWø0.7-ø1.8-t0.1 2
O Wø1.2-ø2.5-t0.3 2

20

VL-WD250U

A

Tightening torque

50mN·m

470

453

399

389

398

438

314

A

A

F-3

F-4

F-5

F-2

F-1

Drum Ass'y

Mechanism fixing angle

PB guide SPR.

Tape guide SPR.

Grease
(Rear surface,
groove side surface)

Grease
(Front surface, rear surface,
groove side surface)

Drum base Ass'y

Drum mounting screw

Drum fixing SPR

A

Q

501

500

Q

Q

H/A FPC shield plate

Head amplifier PWB unit

VL-WD450U

9-5-3. Main chassis assembly and slide chassis assembly assembling method

(1)Enter the coupling mode. (In this position, the cam groove of the T arm operation lever in the figure is parallel to the side of the main

chassis, and the ball base is slightly moved.)

(2)Insert the slide chassis side operation pins (1 tension arm, 2 Tu guide arm, 3 pinch lever) in the position shown below at the

main chassis side, move the slide chassis in the arrow direction, using
into the groove of slide chassis, and install with the 4 screws.

to D as guides, insert the loading lever operation pin

1.

C

C

C

B

A

1

D

Item

C

Special screw ·

C

C

2

3

Tightening torque

40mN·m 4

Quantity

3.

M1.4 x L1.6

2.

FPC cover

377

P

355

Reel cover Ass'y

Oil

A S Tight · M1.4 x L3 40mN·m 1
N CWø0.7-ø1.8-t0.1 1
P

Swing arm Ass'y

N

313

Item

Type 1 minuteness

M1.4 x L1

A

Tightening torque

40mN·m 1

Quantity

21

Item

Tightening torque

Quantity
A S Tight · M1.4 x L3 70mN·m 3
F S Tight · M1.4 x L2 70mN·m 5

4.

Q

Type 2 minuteness
M1.4 x L2

Item

Tightening torque

40mN·m 3

Quantity

VL-WD250U
VL-WD450U

GREASE/OIL APPLICATION

Including groove
side surface

(Applied)

Rear surface · groove
side surface

Drum base assembly

Intermediate gear angle

Pinch control lever

Front surface · rear
surface · groove
side surface

Side of the main chassis

(Applied)

Main cam

S loading arm

Enabled after
assembling

Captan FPC cover

From rear
surface side

From rear
surface side

Enabled after
assembling

T arm control lever

Loading lever

Tu loading arm

: Oiling(Cosmo Hydro HV22)

O

: Greasing(Moly Coat YM-103)

G

: Greasing(Moly Coat YM-103)

Swing arm

After joining the main chassis
and alide chassis

9-6. Removing the cassette

(1)Apply DC3V to the loading motor unload slightly.
(2)After the tape is slackened, turn the rotor (lower side of mechanism)

of capstan motor to tighten the tape. (Arrow direction, Fig. 1)

(3) Repeat the operations (1) and (2). After the pole base has been

completely unloaded, ascertain that the tape is not loose.

(4)Finally apply again DC3V to the loading motor, so that the cassette

controller ejects.
(5)Take out the cassette.
Note) DC3V is applied to the loading motor as shown Fig 1. Then, the

mechanism moves in the unloading direction.

Enabled after

Brake shifter

assembling

Slide adjustment angle

Side of the slide chassis

Sensor FPC wiring

Loading motor

Minus pole

Plus pole

Pinch lever

: Oiling

O

: Greasing

G

: Greasing

Part A

Capstan motor rotor rotation direction
(from rear side of mechanism)

Sensor FPC

22

Fig. 1

VL-WD250U
VL-WD450U

10. ADJUSTING THE ELECTRICAL CIRCUITS

Before starting the electric circuit adjustment

• The adjustment methods described herein are used, in most cases, when the expendable mechanical parts, including
the video head, have been replaced, at which time the electrical circuits need to be readjusted. Before adjusting the
electrical circuits, make sure that the mechanism works properly (i.e., the mechanism is properly adjusted). Incase of
the occurrence of any problem to the electrical circuits, be sure to use the specified measuring instruments to locate
the area to which the problem is occurring, and then take the necessary action, including repair, replacement or
adjustment, exactly as instructed in the electrical adjustment methods that will follow.
Do not attempt to make adjustments without using the proper measuring instruments.

• This machine is configured so that the electrical circuits inside its PWB unit are composed, for the most part, of high­density, small surface-mounted component parts for downsized machine body.
To perform repair service or parts replacement, do so using a soldering iron, but in as short a time as possible; this is
because surface-mounted component parts are generally so small in size and susceptible to heat, as compared with
the large discrete parts used in TV sets, desk-top video decks, etc., that attempting to heat their electrodes for a longer
time than is necessary with a soldering iron may result in their becoming defective.
This applies particularly when replacing the laminated chip capacitors.
For this purpose, ceramic soldering irons with a temperature regulator are recommended (iron tip temperature 250°C
and soldering time 5 seconds or shorter).

23

VL-WD250U

MAIN PWB

QCNW-

@

1709TAZZ

QCNW-

@

2028TAZZ

POWER PWB

JOINT PWB

OPERATION

PWB

AV/S JACK PWB

S

TERMINAL

VIDEO

AUDIOLAUDIO

R

ZOOM SW

UNIT

QSW-Z0362

TAZZ

QCNW-2029TAZZ

IR

REMOCON

PWB

QCNW-2027TAZZ

SC3301

SC551

SC900

10

16

DV/PC JACK PWB

LENS UNIT

CCD

PWB

QCNW-1711TAZZ

Direct

connection

QPWBH3059TAZZ

QCNW-2002TAZZ

V/F UNIT

11

QCNW-2041TAZZ

12

13

14

18

17

15

Microphone

RMiCC0099TAZZ

Speaker

SUB PWB

SC3801

SC3802

SC9800

SC3800

LCD PWB

Direct

connection

LAMP UNIT

MECHANISM

HEAD AMP PWB

QCNW-1832TAZZ

BATTERY

TERMINAL

UNIT

DUNTK3063PM00

HEAD AMP FPC

CPWBH2876TA01

P306

LCD PANEL

Direct connection

QPWBH3060TAZZ

ZOOM MIC UNIT

DUNTK3054PM00

TURN SW UNIT

QSW-Z0364TAZZ

VSP0020P-968N

HEADPHONE JACK

@@@

J2003

@

DV JACK

@@@

J2001

PC connection

JACK

@@@

J2002

P2001

SC5201

SC2001

1 2 17 1

1

120

115115

124

41

1

2

5

4

6

9

8

7

3

12

80

1

SC2024

SC2051

121

121

15 1

22 1

21 1 414

120

117

117

SC801

SC802

P801 P6602 P6601

P5501

SC5002

120

SC1

12220 1

22

1

SC8801

170 40

SC5003

140

SC2021

P1900

SC21

SC5001

1

70

SC901

19

20

122

SC2011

51

SC

2012

1

VL-WD450U

VL-WD250U/WD450U Service jig configuration

24

VL-WD250U/WD450U Specifications of service jigs

VL-WD250U
VL-WD450U

No. Connection section Connector REF. No.

1 H/A_PWB–H/A_FPC P306– 80B-B C QCNW-1832TAZZ BV
2 H/A_FPC–MAIN –SC3301 80B-B CPWBH2876TA01 Product unit use AS
3 MAIN–Battery Terminal SC900← 12 DUNTK3063PM00 Product unit use —
4 MAIN–POWER P1900–SC901 70B-B C QCNW-1709TAZZ BU
5 MAIN–AV/S Jack PWB SC5001–SC2011 22 N QCNW-2028TAZZ AN
6 MAIN–JOINT PWB SC5003–SC2021 40 N QCNW-2027TAZZ AM
7 MAIN–V/F Unit SC8801– 22 C QCNW-2002TAZZ BL

8 MAIN–CCD PWB SC21–SC1 20 QPWBH3059TAZZ Product unit use AF

9 MAIN–Lens Unit SC551– 22 Direct connection —

10 MAIN–DV/PC Jack PWB SC5002–SC2001 17 C QCNW-1711TAZZ AL
11 MAIN–SUB PWB P5501–SC5201 120B-B N QCNW-2041TAZZ BT
12 MAIN–Zoom Mic Unit P6601– 4 DUNTK3054PM00 Product unit use —
13 MAIN–Microphone P6602– 4 RMiCC0099TAZZ Product unit use AT
14 MAIN–TURN SW Unit P801 2 QSW-Z0364TAZZ Product unit use AA
15 MAIN–LCD PWB SC801–SC3801 15-15 QPWBH3060TAZZ Product unit use AR

SC802–SC3800 17-15
16 DV/PC Jack PWB–Speaker P2001– 2 VSP0020P-968N Product unit use AL
17 LCD PWB–LCD Panel SC3802– 24 Direct connection —
18 LCD PWB–LAMP Unit SC9800– 4 Direct connection —
19

J

OINT PWB– SC2024–SC2051 12 N QCNW-2029TAZZ Product unit use AN

Operation PWB

20

AV/S Jack PWB–Zoom SW

SC2012– 5 QSW-Z0362TAZZ Product unit use AR

No. of pins

New or
Continuation

Part cord

Price
code

25

VL-WD250U
VL-WD450U

[TEST POINT]

(Wiring board diagram: Main Side B)

TL604
EE level check
Frequency character check
Super-directional microphone check

TL605
EE level check
Frequency character check
Super-directional microphone check

TL8847(COM)

R220
R221

Z2

TL8839

TL8848TL8841

R222

TL1927
FB201

TL8837

TL8846

C219

TL8821

TL8835

TL8844

C201

C204

VF COM-DC

TL8833

TL8845

TL8843

TL8831

TL8836

TL8834

TL8832

IC201

FB204

Q201

C206

C205

R246

FB202

TL1928

C24

TL8845(VR)
VF sub-contrast R/B
VF sub-brightness R/B

TL8846(VG)
VF COM-DC
VF brightness
VF contrast
VFγ1
VF sub-contrast R/B
VF sub-brightness R/B

TL8844(VB)
VF sub-contrast R/B
VF sub-brightness R/B

TL7800(AFC)
VCO free-run

TL8800(VF-Y)
VF VCO

TL8840(HST)
VF VCO

TL21

TL8849

TL8847

TL8860

TL8842

TL8840

TL8838

L101

C220

C202

C217

TL209

TL208

R203
R204

R218

C214R219

R207
R215

R205R209R208R206R210

R217
R213
R214
R216
R212
R202
R211

C203

FB35

TL5128

TL5129

TL5138

TL5123

TL5125

TL5127

TL24

TL5139
TL5130
TL5121

TL6602(TELE-MIC)

TL6604(GND)
EE level check
Frequency character check

Super-directional microphone check

TL6607(INT MIC R)
EE level check
Frequency character check

TL6605(INT MIC L)
EE level check
Frequency character check

TL824

TL2801(G OUT)
DAC full-scale

SC801

TL2800(R OUT)
DAC full-scale

TL826

TL3331

TL2802(B OUT)

TL827

TL3332

DAC full-scale

R1819

R3453

TL1801(C OUT)
COMMON PULSE

IC3404

TL1800
COMMON PULSE

C3458

C3455

TL3335

R3493

R3492

TL3340

IC3405

C3462

R3475

R3474

R3495
R3494

TL3302

TL3304

TL3311

TL3377

TL3309

TL3348

TL3313

TL3312

TL3314

TL3346

TL4405(B-Y OUT)

TL3316
TL3318

DAC_B-Y

TL3321
TL3323
TL3325

TL4403(Y OUT)

TL3327
TL3320

DAC_Y

TL3336

TL7823(GND)
DAC_Y, DAC_R-Y, DAC_B-Y

TL4404(R-Y OUT)
DAC_R-Y

TL1902

TL1906

TL1905

TL1904

TL1907

TL1903

SC900

TL1926

TL1934

R2801

R3448

C3410

R1720

R3457
C3459

R3444

R3436
R3463C3430R3490R3481C3444

R3462C3429C3471C3434C3431

IC7801

C7808
R7803
C7806
R7812

L7800

R1725
R1726

C1710

L1701

TL6606
R5801
R5800

R5803
R5802

R2800

R3468
C3452

TL3406

R3434

TL4437

R7813
R7814

L4401

R1724

TL1701
TL1917

R3437

C3411

R1723

C1712

TL808

R5804
R5805
TL703

TL702

C1801
C2804
C2803
C2802

R3471

IC3403

C3475

C3423

C3419
C3417

C3409

TL3338

TL3365

R4414

TL3371

TL3343

R1728

Q1701

R1710
C1714

R1722

TL816

TL817

TL823
TL812
TL811
TL809
TL807
TL805

C3457

R3423
C3481

C3421

Q3405
R3499

TL4438
TL4439
TL3364

TL3350TL3345

TL1925

R1711
C1717

TL1705

C1719

TL803
TL802

R3469

FL3401

TL3366

TL4436

TL4440

R1727

TL819

TL815

TL810TL813TL814

TL804TL806

TL801

R1804

R3451

C3456

R3450

TL3401TL3403

TL3363

TL3351
TL3355

TL3341

TL3329TL3315TL3370
C1728

C1718
C1724

R1712

TL818

TL1801

TL1800
R1800

TL1936

FL3402

TL3358

R1713

C1720

C1723

C1721

TL828
TL825
TL822

TL820

Q1800

C3453

C3454

TL3374
TL3372

TL3362
TL3360

TL3356
TL3353
TL3354

R1714

C1722

TL831
TL834

R1802

C1800
R1801

R3452

R3412C3466C3420
R3411R3410C3414

TL3379

TL3378

TL3319

TL1702
TL1916

C1725C1902

TL1704

R1715
C1726
C1727

TL1913

R1716

TL830

TL833TL829
TL832

TL821

R1803C1810

D1800

C3460

TL3307
TL3306

TL3380
TL3375
TL3373

TL3368
TL3317

TL3322

TL3324

TL3326

TL3328

TL3330

TL1901

TL1703

TL5041

R687

C634

IC4461

C4483

C4481

Q1432
C1433R1433

R1435R1434
R1437
C1435
R1436

C1431

C6643

C685

R4466

C4466

L4461

R4485
C4485

C1432
R1432R1431

TL5013

TL5036

R4474

R4486

TL5002
TL5001

C603

C6646

C633

D4451

R4473

Q4471

R4477

Q4472

R4424
R4428

TL5032TL5034
TL5031

TL5033

C6621

TL5035

C6622

R6628

R6629

C6630

R6651

R6654

R6652

R6653

C6645

C6644

R603C616

R660

Q605

R661

Q604

R616

R662

C606

R672

R671

IC601

R654

C631

C632

C625

TL4451

D4452

R4454

L4451

C4454

R4453

R4456

X4451

R4452

R4451

C4451

C4427

R4478

C4426

C4423

C4424

C4422

R4475

C4420

C4472

C4482

C4435

C4436

R4425
C4405
R4488

Q4482

Q4481

R4487

Q1434

R1438

C1436

R1439

R1454
C1404

R1440

C1437

C1409

R1442

TL1431

R1441

R1415

C1440

C1438

R1403
R1404

IC1431

R1453

R1402

C1439

C1441

R1419

TL5004

TL5004
PCO D/A-Y

R6605

IC6601

R6649

C6647

R6650

R6647

C6642

R617
R618

R613

C617

C645

R636
R638
R631

C7843

TL4429

TL4433TL4435

TL4434

TL4417

TL4416

C4412

C4411

R4435

R4415

R4436

C1405

C1408

R1408

Q1405

C1407

R1413

R5007

R1414

SC5001

R6648

TL602
C623

C624
TL601
C628

C629
R635

R4494

R4404

Q4434

L6601Q6604

Q3404

C7837

C4406

P6601

TL6604

R6627

C6620

C6648

R6646

R3446
C3432
R3488

TH3401
R3445

R3486R3432

TL3352

L3404

R3478

FL3403

L3402

R7855

R7854

C7842C4432

C4431
TL4428

R4407

R4405

Q4433

R4443
R4422
R4426

R4423

D1402

IC1401

D1403

C1406

TL5016

TL5011

TL6603

R6602

R3454
R3479

R7843
R7851

R4406

TL5017

R6608
R6609

C6618
C6619

TL7800
R7852

C7841

R4408

Q4442

TL8800

R4420

C1413

C1412

R6606

R6610

R6607

C6601

C6602

C6609
C6610

R6615
R6617

C6613

R6621
C6617
R6658
R6657

Q6602

R6626

C3473

IC3402

R3427R3426

R3487
R3428

C3436

TL3333

R3473

R3472

C3467

R3416
R3417

C3478

R3415

C3425

R3402

C7844
R7841

L7801

C7815

D7800

IC4401

R4411

R4409

R4410

Q4441

R4442R4437
TL4403

R4421C4407
R4429R4499

C1411

TL5021

TL5019

C6606
C6603

C6608
R6613

R6618

C6615
R6623

C3433
C3426
R3421
C3424
C3477
R3419
C3476
R3420
R3470

C3470
C3418

C3416
C3415
R3418

R4418

R1451
C1416
C1418
C1417
R1421
R1461
R1462

C6611

R6625

R3429

R4413

R1729
R1730
R1705
R1706
R1731
R1732

R5006

SC5002

TL5047TL5046TL5045TL5044

TL5037

TL5039

TL5042

C6628

TL5038

TL5043

C6624

C6623

C6626

R6630

C6629

R6631

C6627

R6632
R6633

C6631

R6635

R6634

R6638

C6637

C6636

R6640

R6639

R6641

R6642

C6638

R6636

Q6603

C6634
R6637

C6635

TL604

Q601

TL605

C636

TL571

L603

TL563

Q606

R641

TL557
TL555
TL558

TL37

TL35

TL32

TL31

TL30

TL33

TL25

TL38

TL22

TL36

TL34

C641

TL28

TL29

TL27

TL26

TL23

L601

C218

TL210

TL212

TL211

IC202

C211

C213

TL5132
TL5137
TL5119
TL5120

TL5133
TL5126

TL5102

C1402

TL5131
TL5124

TL5103

TL5134
TL5122

TL5104

C210
L1402

C1415

C207

R201

R651

C651

TL553

TL568
TL551
TL552
TL556

C208

Q1431

TL5108

C6633

C6632

C642

TL567
TL566
TL569

L1404

R663

TL554

C638

C639

TL565

R4463

TL202TL203

TL5135
TL5101
TL5118
TL5105
TL5113

R621

C646R656

R6644

Q602

R610

TL560
TL561

R639

C637

C690

R640

TL564

C640

Q4461
C4464R4468

R4467

TL5115
TL5114
TL5140
TL5106
TL5112

R4464

R6643

TL603

Q608

TL559
TL570

TL562

R4462
R4465

L4481

L1431

TL1924

TL5111

R6659

TL572

Q4462

TL1410

C605

R4461
C4462

C4465

C4461

TL207

R1401
R5004R5003

TL5006
TL5110
TL5009

TL5107
TL5109

R688
R686

C686

R6661

C6639
C6640

R609

R670

R4469
R4460

C4463

Q4432

C215

C212

TL5007

TL5008
TL5010
TL5012
TL5015

R6660

C6641
R6645

R685

C1434

Q1433

Q4431

TL1951

TL5002
PCO D/A-C

TL6601

C6604

C6607

R6614

R6619R6616

C6614

R6656

C3406

C3402

Q4440

TL4404

C1410
C1414

R5005

R6612

C6605

R6624R6620
C6616R6622

C3428

R7847

C7816

R7858
R7857
R7856
C7813R7827

R4412

R4430R4427
C4409R4419
R4417C4408

TL6602

C6612

R3425

C3412

L3401

TL4415

R4450

R4416

Q1401

R1452

C1703

R3424

R3430

C3403
C3401
R3401

C4413

TL4405

R4441

TL5022

TL1948
TL1950

R4403

C2800

C2801

R3422

C3413

C4403

R7860

C4402

IC4472

TL2801

TL2802

C3474

R3413

R3442R3404
R3441

C3443
C3442

TL3344

C7807
R7810
R7806
R7800
C4430
C4421C4419

IC4471

R4402

TL1915

L1702

C1702
C1701

TL1947
TL1949

L3405

C3479

C1705

TL2800

R3409

C7804
R7809
R7801

C4410

C1704

C1706

P6602

TL6607

L2801

IC2800

R3439

R3438

R3443

R3449

IC3401

R3414

C3408

Q3401

C3405

C7850

R7859

C7822

C7821

R7805

R7811

C7802

R7808

R7802

C4417

C4401

L4402

C4404

C4440

C4441

R1734

R1721

R1708

R1709

R1707

R1704

C1707

TL6605

L2800

R2803R2804
R2806R2808
R2805R2807

R2802
R3447

Q3403

R3440

R3435R3491R3480R3482

R3407

R3406
C3465

R3496
R3489Q3406

C7810

C7811

R7804
R7807
C7805

C7800

R4401

TL7823

R4440

R1733

C1708

IC1701

C1715
C1713

C1709

C1716

C1711

26

VL-WD250U
VL-WD450U

[Making adjustments]
Adjusting the servo system controller and related parts

1. Setting the system codes

Replacement of IC703 E2PROM requires the following data to be set in this order.

[Procedure]

Set the unit to the VCR mode and set the data for each address.

Code
Address 01 09 02 0A 03 0B 04 0C 05 0D 07 0F
Data

When replacing the IC703 E2PROM, first make the following settings and then start the adjustments.

(1) Electromagnetic conversion

Address 27 28 2B *105 25 26
Data 40 90 90 80 40 90

* The address uses only when replacing the IC302.

• Adjustment with automatic machine

Mode VCR ADJ mode
Procedure 1) Using the 12 command, set the VCR adjustment mode.

Examples • During E

1. Model code 2. Destination code 3. Specification code 4. Menu selection code 5. Software switching code 6. Calender switching

WD450
WD250 02 FD

01 FE 01 FE 14 EB 00 FF 00 FF 01 FE

2

2) Using the 20 command, give the E

PROM Write permission.

3) Set the system code with the 22 command for each type.

4) Using the command, set write inhibition.

5) Using the command, cancel the adjustment mode.

2

PROM (IC703) replacement.

• Manual adjustment

Mode VCR ADJ mode
Procedure 1) Set the CAM/OFF/VCR selection switch to VCR.

2) Press “CONTINUE” → ”VCR adjustment” on the remote controller to set the VCR adjustment mode.
(At this time an indication “VCR ADJ” appears at the left lower side.)
Enter a setting corresponding to the address.
<Setting method>

3) Adjust the address by moving up and down the blinking numeral with the FF and REW key, and fix the address
by pressing the PB key.

4) Adjust to the setting by moving up and down the blinking numeral with the FF or REW key, and set data by
pressing the PB key.

5) Press the STOP key to set the address set state.

6) Repeat the operations 3), 4) and 5) as much as input addresses. After completion of input of all items hold

down the “CONTINUE” key to cancel the VCR adjustment mode.

7) Set the CAM/OFF/VCR selection switch to OFF.

2

Examples • During E

PROM (IC703) replacement.

2. HSWP adjustment

Mode VCR ADJ mode
Procedure 1) Play back the alignment tape in the video mode.

2) Press the "CONTINUE" and "HSWP ADJ" keys on the adjustment remote control in this order.
→ This executes the HSWP adjustment.
When the adjustment is successful, the LCD lights up [OK] and the cassette is automatically ejected. If not

properly adjusted, the LCD lights up [NG].

Examples • During mechanism replacement. • During E

2

PROM replacement (IC302 inside the head amplifier circuit board).

3. SHUT OFF adjustment

Mode VCR ADJ mode
Procedure 1) Load a recordable tape, and set the camera mode.

Press the "CONTINUE" and then the "TEST SEL" on the remote control for adjustment to enter the TEST mode (T-01 blinks).

2)

3) Select T-03 with the FF or REW key and then press the PB key.

4) Observing the power voltage from TL1901(-), set it so that TL1902(+) obtains 6.00V ± 50mV.

5) Press the PB key on the main unit. Turn off the power and the adjustment is completed.

Examples • During microcomputer (IC701) or E2PROM (IC703) replacement.

27

VL-WD250U

Tape is EJECT.

The built-in VI/O
colour bar is recorded.

VS REW

PB

Phase and
equalizer are
adjusted
automatically.

Judgment

OK:
Blue LCD comes on.

NG:
Red LCD comes on.

0

T

RRC

R

R

1

2

C1404

C

1

3

TL5128TL5125

VL-WD450U

ADJUSTING THE ELECTROMAGNETIC CONVERSION CIRCUIT SYSTEM

1. PLL VCO adjustment

Mode VCR ADJ mode
Procedure 1) Playback the alignment tape (or a self-recorded tape).

2) Call the adjustment mode (V-ADJ).

3) Set the address "2A" and call the data.

4) Set the called data with the FF/REW key to the point where the playback screen appears.
(At this time, the screen full of block noise is OK.)

Examples • During E

2. Phase and equalizer adjustment → (Performed in the VCR mode)

Mode VCR ADJ mode
Procedure 1) Load a self-recorded tape into the deck.

2) After playback for 3 minutes, select the test mode 0F using the remote control for adjustment to start the
automatic adjustment. (The following sequence is automatically performed.)

3) Error rate check

Select and fix the TEST MODE 0B on the adjustment remote control.

4) Manual adjustment method (video adjustment mode)

* Perform this adjustment with the self-recording/playback in the LP mode.
For phase, vary the data for the address 26 and 2B, and for equalizer, vary the data for the address 25 and 27,

to set the error rate is made as small as possible.

H ch side 2B 27

L ch side 26 25

2

PROM replacement. • During circuit board (Main) replacement.

Error rate

Synchronization error 20 or less
Error rate 200 or less (SP Mode)

Phase Equalizer

Synchronization error

H

L

330 or less (LP Mode)

Examples • During mechanism replacement. • During circuit board (Main) replacement. • During E2PROM replacement.

ADJUSTING THE VIDEO I/O CIRCUIT SYSTEM

(Wiring board diagram: Main Side B)

1. PCO D/A-Y adjustment

Test point TL5004 (connected to oscilloscope) Mode EE mode
Procedure 1) Connect the AVS cable and then connect it to the monitor (TO).

Examples • During E2PROM replacement. • During IC4401 replacement. • During IC1401 replacement.

L1431

TL1410

TL5006
TL5110
TL5009

TL5107
TL5109

R1401
R5004R5003

TL5007

TL5008
TL5010
TL5012
TL5015

C1434

Q1433

TL1951

Q1432
C1433R1433

R1435R1434
R1437
C1435
R1436

C1431

TL5013

TL5002
TL5001

R

C14

C1409

R144

TL143

R1441

R1415

C1440

C1438

R1403
R1404

IC1431

R1453

R1402

C1439

C1441

R1419

TL5004

TL5004
PCO D/A-Y

R1408

Q1405

C1407

R1413

R5007

R1414

SC5001

213
214
216
212
202
211

B35

TL5123

TL5139
TL5130
TL5121

C211

C213

C1402

TL5132

TL5134

TL5131

TL5133

TL5137

TL5122

TL5124

TL5126

TL5119

TL5104

TL5103

TL5102

TL5120

TL202TL203

C208

C207

R201

C210

Q1431

L1402

L1404

TL1924

TL5115

TL5135

C1415

TL5114

TL5101

TL5140

TL5118

TL5106

TL5105

TL5111

TL5112

TL5113

TL5108

TL5002
PCO D/A-C

IC1401

D1403

C1406

TL5016

TL5011

C1412

TL5017

TL5019

C1411

TL5021

R1451
C1416
C1418
C1417
R1421
R1461
R1462

R1729
R1730
R1705
R1706
R1731
R1732

R5006

R5005

R1452

C1703

TL5022

TL1948
TL1950

L170

TL1947
TL1949

C1702
C1701

C1705

C1704

C1706

C1707

IC1701

C1715
C1713

C1709

C1716

C1711

L1701

C171

C171

TL17

C1720

C1718

C1717

C1714

TL1916

C1724

C1725C1902

TL1704

R1715
C1726
C1727

C1723

R1722

C1722

TL1703

R1712

TL1913

C1721

TL1705

R1716

C1719

SC900

TL1926

TL1934

TTTTTTT

2) Call the adjustment mode (V-ADJ).

3) Set the address to "22", and call the date.

(100% white signal is output.)

4) Vary the date with the FF and REW keys to set the signal appearing at TL5004 to 1.0Vp-p ± 0.05Vp-p.

1.0±0.05

28

2. PCO D/A-C adjustment

L

L

Test point TL5002 Mode EE mode
Procedure 1) Connect the AVS cable and then connect it to the monitor (TO).

2) Call the adjustment mode (V-ADJ).

3) Set the address to "23", and call the data.

4) Vary the data with the FF and REW keys to set the signal appearing at TL5002 to 0.64Vp-p ± 0.05Vp-p.

Examples • During E2PROM replacement. • During IC4401 replacement. • During IC1401 replacement.

ADJUSTING THE LCD CIRCUIT

* To make this adjustment, set the backlight switch to the "NORMAL" position.

(Wiring board diagram: Main Side B)

VL-WD250U
VL-WD450U

R3457
C3459

R3444

TL6606
R5801
R5800

R5803
R5802

R2800

R3468
C3452

TL3406

R3434

R3437

TL808

R5804
R5805

C3411

TL703

C1801
C2804
C2803
C2802

C3475

C3423

C3419
C3417

TL817

TL702

R3471

IC3403

C3421

C3409

TL3338

TL816

TL823
TL812
TL811
TL809
TL807
TL805

TL803
TL802

R3469

C3457

R3423
C3481

FL3401

Q3405

TL819

TL815

TL810TL813TL814

TL804TL806

R1804

R3451

R3450

TL3401TL3403

TL801

C3456

TL818

TL1936

FL3402

TL1801

Q1800

TL1800
R1800

TL820

C3453

C3454

TL3374
TL3372

TL831
TL834

R1802

C1800
R1801

TL3379

TL3378

R3452

R3412C3466C3420
R3411R3410C3414

T
TL832

D1800

C3460

TL3307
TL3306

TL3380
TL3375
TL3373

TL824

SC801

TL821

TL3331
TL3332

R1819

R1803C1810

IC3404

C3455

R3495
R3494

TL3377

6

3312

L3348

TL826
TL827

TL3335
TL3340

R3474

C3458

IC3405

TL3304

3313

R3492

R3475

TL3311

R3453

R3493

C3462

TL3302

TL3309

14

TL2801(G OUT)
DAC full-scale

TL2800(R OUT)
DAC full-scale

TL2802(B OUT)
DAC full-scale

TL1801(C OUT)
COMMON PULSE

TL1800
COMMON PULSE

TL7800(AFC)
VCO free-run

TL604
TL605

T

R6630
R6632

R6633
R6635

R6634
R6640
C6638

R6636

Q6603

C6634

C6633

R6637

C6635

R6644

C6632

R621

Q601

R663

Q608

Q602

C636

R610

TL560
TL561

R639

R651

C646R656

TL571

L603

C651

C637

TL563

C690

R640

TL554

TL553

Q606

C642

R641

C638

TL557

C639

TL555
TL558

TL564

TL565

TL568

TL567

TL551

C640

TL566

TL552

TL569

TL556

TL5042
TL5043

C6626
C6627

C6636
R6642

R6643

TL603

TL559
TL570

TL562

R4462
465

TL572

TL5039
TL5038

R6659

C605

R4461
C4462

465

C6623
R6631

C6637
R6641

R6661
C6639

C6640

R688
R686

C686

R670

TL5037

C6624
C6629

C6631

R6638
R6639

R609

R685

C6628

R6660

C6641
R6645

TL5041

R687

C634

C6643

C685

R4466

TL5036

C6646

C603

TL5035

R6653

R660

Q604

IC601

C633

TL4451

D4452

3

R6652

TL5033

C6630

R671

C632

R6654

C6645

R661
R662
R672

R6629

Q605

C625

R6651

C6644

C606

R603C616

R616

R4454

4

C6621
C6622

R6628

C6642

R613

R654

C631

R6605

IC6601

R6649

C6647

R6650

R6647

R617
R618

TL602
C623

C617

C624
TL601
C628

C629
R635

C645

R636
R638
R631

43

R6648

L6601Q6604

R6646

R3446
C3432
R3488

TH3401

R3445

TL3352

Q3404
R3478

FL3403

R7854

TL6604

R6627

C6648

L3404

L3402

R7855

R3486R3432

TL6603

C6620

R7843

1

R6602

R3454
R3479

R6608
R6609

C6618
C6619

C3436

C3425

TL7800
R7852

1

R6610
C6601

R6615
R6617

Q6602

R3415

C7844
R7841

R3473

R3472

R3416
R3417

R6621
C6617
R6658
R6657

R3427R3426

R6606
R6607
C6602

C6609
C6610

C6613

C3467

C3478

R3402

R6626

C3473

IC3402

R3487
R3428

TL3333

L7

C3433
C3426
R3421
C3424
C3477
R3419
C3476
R3420
R3470

C3470
C3418

C3416
C3415
R3418

C6606
C6603

C6608
R6613

R6618

C6615
R6623

R3429

C6611

R6625

1

C3402

C6607

R6614

C6614

TL6601
C6604

R6619R6616

R6656

C3406

C7816

R6612

C6605

R6624R6620
C6616R6622

C3428

R7847
R7858
R7857

R3425

C3412

TL6

C6612

L3401

R3424

R3430

C3403
C3401
R3401

R4403

R3422

C2800

C2801

C3413

TL3344

TL2801
TL2802

C3474

R3413

R3442R3404
R3441

C3443
C3442

TL2800

L3405

C3479

R3409

TL6607

R3439

R3438

R3449

IC3401

R3414
Q3401

C3405

TL6605

L2800

L2801

R2803R2804
R2806R2808
R2805R2807

IC2800

R2801

R2802

R3447

Q3403

R3448

R3440

R3443

R3436

R3435R3491R3480R3482

R3463C3430R3490R3481C3444
R3462C3429C3471C3434C3431

C3410

R3407

C3408

R3406
C3465

R3496
R3489Q3406

Adjustment procedure and connecting same as the VCR section.

1. VCO free-run adjustment

Test point TL7800(AFC) Address VCR ADJ 32
Mode VCR AV input
Procedure 1) Input the white 100% signal to AV input.

2) Connect the digital voltmeter to TL7800, and adjust DC voltage value to the specified adjustment value with
VCR ADJ 32.

Adjustment 2.00 ± 0.1V

rating

Examples • During E

• During D/A Converter (IC4701) replacement.

2

PROM (IC703) replacement. • During VIO ENG (IC4401) replacement.

2. DAC full-scale adjustment

Test point TL2800(R OUT), TL2801(G OUT), TL2802(B OUT)
Address VCR ADJ 3D(R), VCR ADJ 3E(G), VCR ADJ 3F(B)
Mode VCR AV input
Procedure 1) Set the VCR ADJ 83/93/C0 to 00/77/00. (At this time, LCD can not be displayed.)

2) With the VCR ADJ 3D, adjust the output voltage of TL2800 and the DC voltage value of the digital voltmeter to
the specified adjustment values.

3) Similarly with the VCR ADJ 3E/3F, adjust the output voltage of TL2801/2802 and the DC voltage value of the
digital voltmeter to the specified adjustment values. (Same as Item (2))

4) Return the VCR ADJ 83/93/C0 to the initial value. (Initial value: C5/7F/28)

Adjustment 0.78V ± 10mV

rating

Examples • During E2PROM (IC703) replacement. • During VIO ENG (IC4401) replacement.

• During D/A Converter (IC4701) replacement.

29

VL-WD250U

c

3

L

R7857

L7801

1

4

4

C7837

4

3

TL30

VL-WD450U

3. COMMON PULSE adjustment

Test point TL1801(C OUT) Address VCR ADJ 29(C)
Mode VCR AV input
Procedure 1) Connect TL1800 to GND.

2) With VCR ADJ 29, adjust the output voltage of TL1801 and the DC voltage value of the digital voltmeter to the
specified adjustment values.

Adjustment 7.05V ± 50mV

rating

Examples • During E2PROM (IC703) replacement. • During D/A Converter (IC4701) replacement.

4. COM-BIAS adjustment

Test point LCD panel display surface Address VCR ADJ 33
Mode VCR AV input
Procedure 1) Input the white 100% signal to AV input.

2) Set up the illuminance meter (TOPCON IM-3) on the LCD panel surface. (The outside light must not enter.)

3)Minimize the ripple of the output waveform of the illuminance meter.

Adjustment Minimum

rating

Response timeF0.6se

Remark Make this adjustment after 5-minute or longer aging.
Examples • During LCD monitor replacement. LCD Panel • During IC4701, IC703 replacement.

5. White Balance adjustment

Test point LCD panel display surface Address VCR ADJ 84(R), VCR ADJ 86(B)
Mode VCR AV input
Procedure 1) Input the white 40% signal to AV input.

2) Input the white 40% signal to the standard monitor, and adjust it to become equal to that of the screen.

Adjustment Standard monitor

rating

Remark Make this adjustment after 5-minute or longer aging.
Examples • During LCD monitor replacement. LCD Panel • During IC4401, IC4701, IC703 replacement.

VIDEO I/O ENG DAC CIRCUIT

L4451

C44R4

IC4461

Q4462

TL29

TL27

TL210

TL212

TL211

IC202

R4464

R4469

Q4461

R4460

TL28

C4463

R4463

C4464R4468

TL23

R4467

L4461

C4461

L601

Q4431

L4481

Q4432

C218

C4483

C215

R4485
C4485

C4481

C1432
R1432R1431

TL207

C212

Q1432

34

TL37

TL35

TL26

TL36

TL34

TL32

TL31

C641

TL38 TL33

C4466

R4486

R4474

Q4471

Q4472

D4451

R445

R4473

R4477

R4424
R4428

Q4481

C4435

R1438
R1439

1437

R4425
C4405
R4488

Q1434

X4451

R4451

C1436
R1440

41

R4487

C4427

R4478
C4424

C4420

Q4482

C4482

C4436

1442

C4423
R4475

C445

C4472

431

R4456

R4452
C4451

C4426
C4422

R1454
C1404

TL4416

C4412

R4435

C1405

C1408

TL4433TL4435

TL4434

TL4417

C78

C4411

R4415

R4436

R4494

TL4429

R4404

Q4434

C4406

C4431
TL4428

R4405

R4443
R4422
R4426

R4423

Q4433

R4407

D1402

C7842C4432

R4406

1. DAC_Y adjustment, DAC_R-Y adjustment, DAC_B-Y adjustment

Test point TL4403(Y OUT), TL4404(R-Y OUT), TL4405(B-Y OUT), TL7823(GND)
Mode CAM
Address VCR ADJ FA(Y), VCR ADJ FB(R-Y), VCR ADJ FC(B-Y)
Procedure 1) Set VCR ADJ 303/304/432/423/424/425/526 to 0C/EF/63/90/EB/80/80.

2) With VCR ADJ FA, adjust the output voltage of TL4403 and the DC voltage value of the digital voltmeter to the
specified adjustment values.

3) Similarly with VCR ADJ FB/FC, adjust the output voltage of TL4404/TL4405 and the DC voltage value of the
digital voltmeter to the specified adjustment values. (Same as Item (2))

4) Return VCR ADJ 303/304/432/423/424/425/426 to the initial value.

Note:When it is changed to the initial value FF/FF/C3/10/29/6E/F0, OSD display goes out together with LCD/VF.

Checking the monitor output, adjust it. After adjustment, be sure to return to FF.

Adjustment 0.450V ± 5mV (Y OUT), 0.229V ± 2mV (R-Y OUT), 0.290V ± 2mV (B-Y OUT)

rating

Examples • During IC4401, IC4701, IC703 replacement.

C7841R785

C7815

D7800

IC4401

R4410

R4408

Q4442

TL4403

TL8800

R4420

C1413

R4409

R4442R4437
R4421C4407

R4429R4499

R4411

Q4441

R4418

R1451

R4413

C1410
C1414

R4412

Q4440

TL4404

R4430R4427
C4409R4419
R4417C4408

R7856
C7813R7827

TL4415

R4450

R4416

Q1401
52

C4413

TL4405
R4441

C4403

R7860

C4402

IC4472

R4402

TL1915

1702

C7807
R7810
R7806
R7800
C4430
C4421C4419

IC4471

C7804
R7809
R7801

C1704

C4410

C7821

C4401

R1709
R1704

R7859

R7811
R7808
R7802

C4441

R1721

C7822

R1708
R1707

C7850

L4402

C4404
C4440

R7805
C7802
C4417

R1734

C7811

C7800

R1733

C7810
R7804
R7807
C7805

R4401

C1708

TL7823

R4440

R1720

(Wiring board diagram: Main Side B)

T

TL4436

TL3351
TL3355

TL3341

718

TL3363

TL3358

TL3329TL3315TL3370
C1728

720

R1713

TL3362
TL3360

TL3356
TL3353
TL3354

R1714

TL3319

1702

TL3368
TL3317

TL3322
TL3324
TL3326
TL3328
TL3330

TL1901

TL334
TL3316
TL3318

TL1903

TL3321
TL3323
TL3325
TL3327
TL3320

TL3336

TL1907

TL3TL

TL1904

TL331

TL4405(B-Y OUT)
DAC_B-Y

TL4403(Y OUT)
DAC_Y

TL7823(GND)
DAC_Y, DAC_R-Y, DAC_B-Y

TL4404(R-Y OUT)
DAC_R-Y

TL1902

TL1906

TL1905

IC7801

C7808
R7803
C7806
R7812

R1725
R1726

L7800

L4401

R1724

TL1701
TL1917

1710

TL4437

R7813
R7814

R1723

1712

TL3343

Q1701

R1710
714

TL4438
TL4439
TL3364

TL3365

R4414

TL1925

TL3371

R1728

R3499

TL3366

TL3350TL3345

R1727

R1711
717

TL4440

30