SHARP VLH870, VLH870U, VLH875U, VLH890U Service Manual

VL-H870U VL-H875U VL-H890U

SERVICE MANUAL

S29C4VL-H870U

LIQUID CRYSTAL CAMCORDER Hi 8 NTSC

VL-H870U VL-H875U

VL-H870U

VL-H875U

VL-H890U

LIQUID CRYSTAL CAMCORDER Hi

NTSC

MODELS VL-H870U/H875U/H890U

1. IMPORTANT SERVICE NOTES ..................................................................................................... 1-1

2. SPECIFICATIONS ........................................................................................................................... 2-1

3. PART NAMES AND FUNCTION ......................................................................................................3-1

4. DISASSEMBLY OF THE SET.......................................................................................................... 4-1

5. MECHANISM ADJUSTMENT ..........................................................................................................5-1

6. ADJUSTMENT OF VCR AND CAMERA..........................................................................................6-1

7. SYSTEM BLOCK DIAGRAMS ........................................................................................................ 7-1

8. SCHEMATIC DIAGRAMS ............................................................................................................... 8-1

9. SEMICONDUCTOR LEAD IDENTIFICATION ................................................................................ 9-1

10.PRINTED WIRING BOARD ASSEMBLIES................................................................................... 10-1

11.REPLACEMENT PARTS LIST ...................................................................................................... 11-1

12.PACKING OF THE SET ................................................................................................................ 12-1

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-H890U

Page

SHARP CORPORATION

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

VL-H870U

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-H875U VL-H890U

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 resisor (See Diagram).

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

VL-H870U VL-H875U VL-H890U

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.

1-1

VL-H870U

1.5A 250V

VL-H875U VL-H890U

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

THIS APPLIANCE TO WET LOCATIONS.

CAUTION

RISK OF ELECTRIC SHOCK

CAUTION: TO REDUCE THE RISK OF ELECTRIC

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

DO NOT OPEN

CAUTION

This symbol mark means following. For continued protection against fire hazard, replace only with same type fuse. (CP901; 1.2A 72V, CP902; 1.2A 72V, CP903; 1.2A 72V)

Camcorder

only

VL-H870U VL-H875U VL-H890U

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 haz- ard, replace only with same type fuse. (F1; 1.5A 250V)

AC Adapter

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.

ATTENTION

Ce symbole signifie que l'on devra utiliser un fusible de même type (CP901;

1.2A 72V, CP902; 1.2A 72V, CP903;

1.2A 72V) pour assurer la sécurité.

Camcorder

seulement

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 uti- liser un fusible de même type (F1; 1,5A, 250V) pour assurer la sécurité.

1-2

Adaptateur CA

seulement

1,5A 250V

VL-H870U VL-H875U VL-H890U

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.

VL-H870U VL-H875U VL-H890U

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.

1-3

VL-H870U VL-H875U VL-H890U

2. SPECIFICATIONS

Signal System: NTSC standard

Recording System: 2 rotary heads, helical scanning system

Cassette: 8 mm video tape, MP type or Hi8 MP, ME type

Recording/Playback Time: 120 minutes (P6-120)

Tape Speed: 14.345 mm/second

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

410,000 pixels including optical black)

Lens: 22 × power zoom lens (F1.6, f=4.0-88.0 mm) and full-range auto focus

Lens Filter Diameter: 46 mm

Monitor: 3" (7.5 cm) (VL-H870U/H875U)

3.5" (8.8 cm) (VL-H890U) full-color LCD screen (TFT active matrix)

Microphone: Electret stereo microphone

Color Temperature Compensation: Auto white balance with white balance lock

Minimum Illumination: 4 lux (15 lux measured by EIA standard) (with gain-up, F1.6)

Video Output Level: 1.0 Vp-p 75-ohm unbalanced, S video terminal, Y signal 1.0Vp-p

chroma signal 286mVp-p(Burst)75Ω

Audio Output Level: –8 dBs, impedance less than 2.2 kohms

Speaker Output: 200 mW

External Microphone Input: 3.5 mm diameter mini-plug, –66 dBs, output impedance 6.8kohms, DC

4 V, for plug-in-power microphone use

Power Requirement: DC 7.4V

Power Consumption:

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

Operating Humidity: 30% to 80% Storage Temperature: –20°C to +60°C (–4°F to 140°F) Dimensions (approx.): 7

Weight (approx.): 1.66 lbs 755g (VL-H870U/H875U)

4.9W (VL-H870U/H875U)

5.3W (VL-H890U) (during camera recording in full auto mode with zoom motor off, Extend Zoom, DIS and Snapshot functions off, and backlight in normal mode)

/32" (W) × 4 13/32" (H) × 4 7/32" (D)

[180 mm (W) × 112 mm (H) × 107 mm (D)]

1.68 lbs 760g (VL-H890U) (without battery pack, lithium battery, video cassette, and lens cap)

VL-H870U VL-H875U VL-H890U

AC Adapter UADP-0303TAZZ

(VL-H870U/H870UC/H875U/H890U/H890UC)

AC Adapter UADP-0304TAZZ

(VL-H870UA/H870UW/H890UA/H890UW)

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

Battery Pack BT-L241(VL-H870U/H875U)

DC Output: 7.2V

Dimensions (approx.): 2

Weight (approx.): 0.30 lbs (136 g)

/8" (W) × 3/4" (H) × 2 7/32" (D) [54 mm (W) × 19 mm (H) × 56 mm (D)]

DC Output: 9.0 V

Power Consumption: 15 W

Dimensions (approx.): 2

/16" (W) × 1 15/32" (H) × 5

/32" (D) [68 mm (W) × 37 mm (H) × 137 mm (D)]

Weight (approx.): 0.73 lbs (330 g)

Battery Pack BT-L241 (VL-H890U)

DC Output: 7.4V

Dimensions (approx.): 1

/16" (W) × 1 11/16" (H) ×

/8" (D) [40 mm (W) × 43 mm (H) × 54 mm (D)]

Weight (approx.): 0.21 lbs (97 g)

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)

2-1

VL-H870U VL-H875U VL-H890U

3. PART NAMES AND FUNCTION

For details on the use of each control.

VL-H870U VL-H875U VL-H890U

3-1

VL-H870U VL-H875U VL-H890U

4. DISASSEMBLY OF THE SET

4-1. DISASSEMBLY OF THE VCR PARTS

Note:

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

<1. Removal of the Cabinet L>

(i)

VL-H870U VL-H875U VL-H890U

(1) Slide the VCR lid knob in the arrow direction, open the VCR

lid.

(b)

(2) Remove the screws(b)LX-HZ0018TAFF(2pcs.).

(i)

(5) Remove the screws(i)XiPSN20P04000(2pcs.).

L.Cabinet

FPC connector

(6) Close the VCR lid. (7) Lift about half of the L.Cabinet parts in the arrow direction,

remove the FPC connector.

(d)

(3) Turn the Camera section, and remove the screws

(i)XiPSN20P04000(1pc.), (d)XiPSF20P04000(1pc.).

(i)

(4) Remove the A.V.terminal cover and the screws

(i)XiPSN20P04000(3pcs.).

(8) Remove the outside charging battery connector.

A.V.terminal FPC

(9) Remove the A.V.terminal FPC.

Note:

The FPCs and the wires of process (7), (8), and (9) are connecting with the L.Cabinet, and remove the L.Cabinet while it is floating from the main body. If the L.Cabinet is drawed violently, they have some apprehensions of snap off the wires.

4-1

VL-H870U VL-H875U VL-H890U

<2. Remove the Tripod Angle.>

(d)

Tripod Angle

(d)

(1) Remove the screws(d)XiPSF20P04000(3pcs.), pull the Tri-

pod Angle.

<3. Removal of the LCD unit>

LCD unit

(d)

(b)

Inverter transformer

Main P.W.B

(f)

Microphon connector

(3) Remove the Microphon connector.

Remove the main P.W.B.fixing screws (f)XiPSD20P03000(3pcs.). Lift the main P.W.B. in the arrow direction and remove the connection "B to B".

<5. Removal of the main P.W.B>

Lithium connector

Main P.W.B

Camera FPC

(1) Remove the Camera FPCs(2pcs.) are connected with main

P.W.B. and the Camera section, and remove the Lithium connector.

(1) Remove the FPCs from connectors A,B and C. (2) Remove the screws(d)XiPSF20P04000(1pc.) and (b)LX-

HZ0018TAFF(1pc.).

<4. Removal of the V.Cabinet>

Remove the Lithium Holder

(b)

V Cabinet

(1) • Firstly, remove the Lithium Holder.

•Turn to upside the surface of V.lid, remove the V.Cabinet fixing screw (b)LX-HZ0018TAFF (1pc.).

(d)

(b)

Remove the battery connector

Remove EJECT TURN S.W. connector

(2) The same as process4., remove the battery connector in the

reverse side of P.W.B. and EJECT TURN S.W. connector, and disconnect the Tilt section and main P.W.B..

<6. Removal of the Cabinet and Mechanism>

(b)

(d)

(e)

(1) Remove the screws (b)LX-HZ0018TAFF (1pc.), (d)

XiPSF20P04000 (3pcs.) and (e) LX-BZ0191TAFD (2pcs.).

Side angle

(g)

(2) Turn the Camera section to right angle, remove theTilt side

fixing screws (g)LX-HZ0045TAFF (2pcs.), the bottom side screw (b)LX-HZ0018TAFF(1pc.), open the VCR lid, and remove the slant wise screw (d)XiPSF20P04000 (1pc.).

Note:

The Tilt section is setting with the parts of the Camera section . (Never remove the parts of Camera section only.)

(e)

(2) Pull the Mechanism from K.S.V.Cabinet, remove the

screw(e)LX-BZ0191TAFD(1pc.) and the side angle.

4-2

VL-H870U VL-H875U VL-H890U

<7. Removal of the cassette compartment lid>

VL-H870U VL-H875U VL-H890U

Note:

When fixing the cassette compartment lid, first engage the

claws A and B, and then engage the claws C and D, verify that the four claws (A, B, C and D) of the cassette compartment lid are securely engaged as shown in the view below.

Claw C

Claw B

Claw D

View E

Claw A

View F

(1) Using the slotted precision screwdriver, push and turn the two claws (C and D) which fasten the cassette compartment lid, and

the cassette compartment lid will be removed from the hook area of the cassette component.

(2) Turning the cassette compartment lid in the arrow direction, lift it, and the claws A and B will be disengaged to remove the

cassette compartment lid.

Note:

Take care to prevent breaking the claws of the cassette compartment lid.

<8. Removal of LCD Unit>

(3)

(L)

(B)

(A) Touch Panel Fitting A (B) Touch Panel (C)LCD Panel (D)LCD Holder A (E) DBEF Sheet (F) Prism Sheet (G)Diffusion Sheet (H)Light Guide Plate (I) Reflection Polarizing Sheet (J) Lamp Inverter (K) LCD Holding Sheet (L) Touch Panel Sheet

(A)

(C)

(K)

(D)

(2)

(4)

(a)

(1)

(J)

•At the time of removing from the LCD Holder A(D), and take off the hooks(1)(2pcs.).

•At the time of removing from the LCD Holder A(D), take off (K), remove the FPC from the hooks(3)(2pcs.), disengage the claw(2), and slide the LCD Panel (C) in the (a) direction to remove the LCD Holder A (D).

•At the time of removing from the LCD Holder A(D), remove the claws (4)(2pcs.).

` Refer to the item CABINET EXPLODED VIEW about other parts.

(E)

(F)

(G)

(H)

(I)

4-3

VL-H870U VL-H875U VL-H890U

4-2. REMOVAL OF THE CAMERA PARTS

Note:

Before removing the Cabinet, turn off the power supply,and ascertain that the battery has been removed.

VL-H870U VL-H875U VL-H890U

(a)

(c)

(b)

(d)

Pull out

Camera front cabinet

1. Remove the screws (b)LX-HZ0018TAFF(1pc.),(a)LX-HZ 0018TAFN(1pc.),(c)LX-HZ0045TAFN(1pc.)and (d)XiPSF20P04000(1pc.), pull out the Front cabinet.

(b)

(d)

(c)

Speaker connector

(c)

Pull out

(g)

Camera rear grip cover

Remove

(g)

2. Remove the screws (g)LX-HZ0045TAFF(2pcs.) and the Camera rear grip cover .

Connector

4. Remove the screws(b)LX-HZ0018TAFF(1pc.),(c)LXHZ0045TAFN(2pcs.)and (d)XiPSF20P04000(1pc.),pulling out the Camera rear Cabinet, and remove the Speaker connector.

(c)

Battery catcher connector

Pull out

Tilt Frame C

Claw

3. Remove the connector.

5. Remove the screw(c)LX-HZ0045TAFN(1pc.)and pull out the Tilt Frame C. Pull out the Tilt Frame C. at right angle, because of closing the claw. Then, pull out the battery catcher connector from the Tilt Frame C.

4-4

VL-H870U VL-H875U VL-H890U

Tilt connector

6. Remove the Tilt connectors(2pcs.) as the Tilt Frame C. are floating in the air.

Note:

Take care to prevent breaking the FPC when the Tilt Frame C. is removing from them.

Remove

Open

(c)

Remove

VL-H870U VL-H875U VL-H890U

Screws

a LX-HZ0018TAFN M2x6 Tapping Screw, Silver b LX-HZ0018TAFF M2x6 Tapping Screw, Black c LX-HZ0045TAFN M2x4 Tapping Screw, Silver d XiPSF20P04000 M2x4 Small Screw, Black Zinc Plating e LX-BZ0191TAFD M2 Special Screw

f XiPSD20P03000 M2x3 Screw g LX-HZ0045TAFF M2x4 Tapping Screw, Black h LX-HZ0013TAFF M1.7x6 Tapping Screw, Black

i XiPSN20P04000 M2x4 Small Screw, Silver

j LX-HZ0050TAFN M1.7x4 Tapping Screw, Silver k LX-BZ0236TAFD M2x8 Screw

l XiPSF20P03000 M2x3 Screw, Black

(g)

7. Remove the screws(g)LX-HZ0045TAFF(1pc.) and (c)LXHZ0045TAFN(1pc.),opening the claws(2pcs.)to outward, remove the Lens unit with Camera P.W.B.

4-5

VL-H870U

Mark

The THIN SIDE faces the lens

Sensor Holder

CCD Sensor

Crystal

Rubber

(b)

Lens Side

CCD Side

The mark must be on this face.

VL-H875U VL-H890U

4-3. REPLACEMENT OF CCD SENSOR

4-3-1. Before replacement

1) The CCD image sensor is more sensitive to electrostatic breakage than C-MOS LSI. Therefore sufficient means to prevent electrostatic damage must be taken when it is replaced.

• Ground the soldering iron.

• Ground also the human body, using the wrist strap(through an 1 Mohm resistor).

• Until the CCDsensor is mounted on the PWB, fit it to the conductive sponge, and short-circuit the foot lead.

2) Take utmost care so that the surface glass of CCD sensor and optical filter are not contaminated and damaged. If any contamination is found, for example fingerprint, wipe it off with silicon paper or clean chamois skin.

3) When replacing the CCD sensor, use the antistaic grounded soldring iron, and perform quickly soldering.

VL-H870U VL-H875U VL-H890U

Index Mark

JAPAN

SHARP

LZ2453A6

YYWWXXX

14 8

4-3-2. Removal of CCD

1) Unsolder the CCD sensor leads from the sensor PWB.

2) Take out the sensor PWB.

3) Remove the two screws (b), and remove the sensor holder and CCD sensor.

4-3-3. Mounting of CCD

1) Place the lens unit upright (since the CCD sensor mount ID faces upward, care must be taken so as not to damage the front lens of unit), put the crystal filter first and then the dust protection rubber into the CCD holder of lens unit. Set the crystal unit with its thin side toward the lens unit.

2) Place the CCD sensor so that the its No. 1 pin is at the right lower (Positioning hole to be at right), and put the CCD sensor into the CCD holder. For smooth and tight fitting, press the right lower part of back of CCD sensor, and then press the left upper part.

Note: Pay attention to the direction of CCD sensor.

3) Place the sensor holder so that its two round markings be visible, and fix the sensor holder with the two screws ((b)LX-HZ0013TAFF).

4) Mount the sensor PWB so that the CCD sensor leads go thorough the PWB holes.

5) Solder the CCD sensor lead to the sensor PWB.

Note: Take care not to apply excessive heat.

4-6

VL-H870U VL-H875U VL-H890U

5. MECHANISM ADJUSTMENT

5-1. MECHANISM CHECKING/ADJUSTING JIGS, TOOLS AND PARTS

5-1-1. Mechanism checking/adjusting jigs and tools

<Note: The entries of list>

VL-H870U VL-H875U VL-H890U

Configuration

1. Name

2. Part No.

3. Code * Model, Uses Remarks

1. Cassette torquemeter for PB

2. JiG8T-012

3. CV

* (10 g·cm/25 g·cm)

1. Master plane

2. JiGMP-MX7U

3. CG

* For adjustment of Tu guide

height, Si roller height and checking of reel disk height

1. Hex wrench

3. —

For loosening or tight-

ening of Motor stator (1.3mm)

1. Cassette torquemeter for VS-REW

2. JiG8T-032

3. CV

* (50 g·cm/25 g·cm)

1. Height adjusting jig

2. 9DAGH-E31S

3. BM

* For adjustment of Tu

guide height and Si roller height

1. Tension Band and Plate

Adjusting Jig

2. JiGDRiVERMX7U2

3. BN

1. Torque gauge

2. JiGTG0045

3. CN * For measurement of loading brake torque

1. Tu guide height adjusting driver

2. 9EQDRiVER-V712

3. BL

1. Torque gauge head

2. JiGTH-MX7U

3. BS * For torque gauge listed left

1. Guide roller height adjusting driver

2. JiGDRiVERHMX7U

3. BU * Bit shape (See the figure above.)

1. Alignment tape

2. VR2ABOPS

3. BT

TAPE CONTENTS

VIDEO IMAGE AUDIO TIME MONOSCOPE L-CH 400Hz 30MIN

R-CH 1,000Hz

1. Torque driver (1.5 kg·cm)

2. JiGTD1500RT0H

3. CB

Tolerance±0.1

1.8

Edge

thickness 0.5

(1) Slide calipers (2) High-precision screw-

drivers (Phillips head, slotted head)

(3) Radio pliers (with thin

jaws)

(4) A pair of tweezers

5-1-2. Parts for periodic inspection and maintenance.

1. Oil COSMOHYDRO HV100

* Cosmo Oil Co., Ltd.

1. Greases Morycoat YM-103/X5-6020

* Dow Coaning

1. Screw locking agent (1401B)

* Three Bond

1. Cleaning liquid (Industrial-use ethyl alcohol)

1. Cleaning paper

2. JiGDUSPER

3. AP * Dusper ∑ (Sigma) (Ozu Co., Ltd.)

5-1

<Note: The entries of list>

1. Superfine swab * Commercially available item

Configuration

1. Name

2. Part No.

3. Code * Model, Uses Remarks

VL-H870U VL-H875U VL-H890U

5-2. ITEMS AND TIMINGS OF INSPECTION AND MAINTENANCE

The mechanism of VCR needs the following periodic inspection and maintenance in order that it maintains its high quality. Also, after the machine is repaired, execute the following maintenance and checks regardless of how long it has been used.

5-2-1. Inspection and maintenance list

Checking/Maintenance point

Tape travel system

Tape travelling route (Refer to Section)

Drum (Refer to Section)

Video head

Timing belt Pinch roller Capstan D.D. motor

Driving system

Relay Pulle shaft Pulle gear shaft

Drive gear shaft

Loading motor

Performance check

Abnormal sound PB/VS-REW take-up torque PB/VS-REW back tension torque

Tu brake HC (Head Cleaner)

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

★★★★★

Oil: COSMOHYDRO HV100 Greases: MORYCOAT YM-103/X5-6020 Screw locking agent: THREE BOND 1401B Cleaning liquid: Industrial-use ethyl alcohol

Usage time (hrs.)

★★★

∆∆∆

★★★

★★★ ★★★

★★★

: Replace. : Clean. ∆ : Apply oil. ★ : Check.

Possible symptom

encountered

• Lateral noise

• Unclean head

• Screen shaking

• Improper S/N ratio

• No color appears.

• Tape does not run.

• Tape slackens.

• Screen shakes.

• Abnormal sound • Apply oil.

• Not ejectable

• The specific mode cannot be set.

Remarks

Rollers

• If abnormal rotation or deflection (significant) is found, replace the roller. Other than rollers

• Clean the tape contacting areas. Be sure to use the specified cleaning agent.

• Replace if failure is found.

(Oil : COSMOHYDRO HV100)

Note: After oil is applied to the drive gear shaft, slightly wipe it off with swab.

• Replace if failure (abnormal sound) is detected.

• If conformance to the standard is not ensured, replace part.

VL-H870U VL-H875U VL-H890U

5-2-2. Notes and cautions

(1) Any cut washers, once removed for parts replacement or for other

reason, must be replaced with new ones.

(2) The mechanism of this VCR does not involve any volume adjustment.

If the specified range is not satisfied, either cleaning or replacing the parts is required.

(3) Oils

a) Be sure to use the specified oils (different viscosity may cause

troubles).

b) For the bearings, be sure to use oil that is free form dust and other

foreign substances. (Dust or foreign substance contained in the oil may cause wear or seizure of the bearings.)

c) A drop of oil represents the amount of oil which is held on the needle

top as shown in the figure 1. (4) The circuit repair must be executed without removing the V frame. (5) For operating the mechanism alone, actuate it with the motor. The

terminal-to-terminal voltage must be DC4V or less.

(6) When installing the cassette control, press the part A shown in Figure

2. *Do not press other parts.

(7) Take care so that the whole mechanism is not deformed.

5-2

Oil

Diameter φ1.5 or less

Figure 1

Figure 2

VL-H870U VL-H875U VL-H890U

5-3. MECHANISM CHECKS AND ADJUSTMENTS

The description given below relates to the general field services, but does not relate to the adjustment and replacement that require high level equipments, jigs, and technical skills. In order to maintain the initial characteristics of the machine, it is necessary to execute the maintenance and check and to prevent damage to tapes and other parts. For adjustments which need jigs, be sure to use the jigs.

Notes and cautions

(1) For mechanism checks and adjustments, be sure to use the AC adapter as the power supply. (2) For running the tape, be sure to install the cassette control ass’y in advance. (If the cassette control ass’y is to be removed

subsequently after its installation.)

5-3-1. Checking the reel disk height

(1) Remove the cassette control ass’y. (2) Taking due care not to let the master plane touch the tape running areas such as the drum and the guide rollers, position the

master plane so that the two guides (A and B in the figure 1) are set in the holes of master plane, then properly set it in the mechanism.

(3) Using the slide callipers or the like, check that the distance from the upper surface of master plane to the reel support surface

of the S/Tu reel disk is within the specified range. (Figure 2)

Note:

When measuring, do not apply excessive force to the reel support surface of reel disk.

(4) If the measurement is not within the specified range, replace the reel disk ass’y. (5) Check the items (2) to (4) above in the following two modes.

a) Standby mode b) Playback (recording) mode

VL-H870U VL-H875U VL-H890U

Reel support surface

4.4 ± 0.15

Figure 2Figure 1

5-3-2. Checking the take-up torque for playback (recording)

(1) Set the torque cassette (JiG8T-012) in position, and check in the SP-mode recording mode (tape recorded in SP mode) that

the torque at the tape taking-up side is within the standard range. Standard of take-up torque for SP-mode recording (playback)

9 ± 3 g·cm with ripples less than 4 g·cm

(If the torque ripples appear, read the center value of torque between the ripples.)

5-3-3. Checking and adjusting the back tension torque for playback (recording)

(1) Checking

1) Set the torque cassette (JiG8T-012) in position, and check in the SP-mode recording mode (tape recorded in SP mode) that the torque at the tape supply side is within the standard range.

Standard of back tension torque for SP-mode recording (playback):

8 ± 2 g·cm with ripples of less than 2 g·cm (Torque ripple must be within 8 ± 2g·cm)

(2) Adjustment

1) If the back tension torque is not within the standard range, adjust the tension spring hooking position. If the back tension is too high, hook the spring in the direction A. If the back tension is too low, hook the spring in the direction B.

Note:

1. After back tension torque adjustment be sure to check the tension pole position.

4.4 ± 0.15

5-3

VL-H870U

3 – 0.5

Si roller

Tension pole

T Band Holder B

Screw (a)

(B)

Hole (C)

(A)

VL-H875U VL-H890U

5-3-4. Checking and adjusting the tension pole position

(1) Check

When winding of P6-120 tape is started, check whether the tension pole is in the specified position against Si roller as shown or not. If it is not in the specified position, remove the cassette and adjust the position in the following procedure.

(2) Adjustment

1. Don’t set up any tape, and select the PB mode. (Refer to Item 5-5-1-(4).)

2. Slightly loosen the screw (a) (to such a strength as the T band holder B can be moved).

3. If the tension pole is in the inner position than specified, dislocate the T band holder B in the arrow (A) direction and if it is in the outer position, dislocate it in the arrow (B) position. Then, tighten the screw (a). (For reference, dislocate it 0.4 to 0.8 mm outer from the position specified above.) For the position adjustment, it is convenient to use the position adjustment screwdriver (JiGDRiVERMX7U2). (Set it in the hole (C).)

4. Check the position in the “(1) Check” procedure described above.

5. If it is not in the specified position, repeat the adjusting procedure 1 thru 3.

Note:

• Tightening torque of screw (a) 70 mN·m

• To check the position, be sure to run the tape.

• If the cassette compartment assembly is removed, it makes the work easier. (Refer to Item 5-5-3.)

VL-H870U VL-H875U VL-H890U

5-3-5. Checking the take-up torque for rewind playback (VS-REW)

(1) Remove the cassette compartment ass'y and set to the sensor OFF mode. (2) Set the torque gauge (JiGTG0045) on the S reel disk, and check in the rewind playback (VS-REW) that the torque at the supply

side is within the specified range.

Standard of take-up torque in rewind playback (SP mode)

31 ± 5 g·cm with ripples less than 5 g·cm.

(If the torque ripples appear, read the center value of torque between the ripples.)

5-3-6. Checking the back tension torque for rewind playback (VS-REW)

(1) Set the torque cassette (JiG8T-032) in position, and check in the rewind playback (VS-REW) mode that the torque at the tape

take-up side is within the specified range. Standard of back tension torque in rewind playback (SP mode):

14 ± 5 g·cm with ripples less than 5 g·cm

(If the torque ripples appear, read the center value of torque between the ripples.)

5-4

VL-H870U

Drum

Reel

Tension pole

Si roller

Sup GR

Sup tilted pole

Tu tilted pole A

Tu GR

Tu tilted pole B

Capstan shaft

Tu guide

Pinch roller

Upper flange

Lower flange

Height adjusting jig

Master plane (JiGMP-MX7U)

Rise waveform

REV OK Playback

REV NG Playback

VL-H875U VL-H890U

5-4. ADJUSTMENT OF MECHANISM TAPE TRAVEL SYSTEM

5-4-1. Preparation for adjustment

(1) Clean the tape running areas (guide poles, rollers, drum,

Capstan shaft, Pinch roller) (Figure 1)

(2) Connect the oscilloscope to the following TPs.

RF output..... TL7406

H-SW-P ....... TL7446

GND............. TL7452

(3) Playback the alignment tape (VR2ABOPS). (4) Ascertain that each guide is free from remarkable curl. (5) Ascertain that the RF waveform of inlet and outlet sides is flat

on the oscilloscope (Figure 2, (a)). Unless the waveform is flat, (Figure 2, (b), (c)), make an adjustment as follows.

VL-H870U VL-H875U VL-H890U

5-4-2. Adjusting the Sup GR and Tu GR

Tape travel system (Figure 1)

(1) Turn the Sup and Tu guide rollers to get the flat waveform at the inlet and outlet sides.

Inlet side Outlet side

(a) Normal

(b) Inlet side waveform is disturbed.

Figure 2

5-4-3. Adjusting the Si roller height

After replacement of Si roller preset and adjust the Si roller height. (1) Si roller height presetting

Adjust the height from the upper surface ofmechanism chassis to the upper surface of lower flange with the aid of jig. Then lower it by 90° (clockwise).

Figure 3

(2) Adjusting the Si roller

1 Playback the tape to set the V/SR mode. 2 Ascertain that the tape is not folded on the lower flange (B) of Si roller. (Figure 4) If tape folding is found, turn the upper flange (A) of Si roller with the driver (clockwise) to eliminate the folding. 3 Playback the alignment tape (VR2ABOPS). 4 Adjust the Sup GR and Tu GR by the procedure described in section 4-2 above. 5 After V/S F,R perform playback so as to ascertain that the waveform rises horizontally within 2 seconds. 6 Unless the normal waveform is obtained (Figure 5), turn counterclockwise the upper flange (A) of Si roller, and repeat the step

(5) above. Repeat the steps (5) and (6) until the normal waveform is obtained. At this time ascertain that the inlet travel does not change in the normal playback state. If any change is found, adjust the Sup GR, and redo the step (5).

Si roller

Upper flange (A)

Tape must be free from folden

Figure 4

REV mode

Lower flange (B)

Figure 5

5-5

VL-H870U

abcd

a b c d

C 1/8A

Capstan shaft

Tu guide

Tape slackness

Tu GR

Tension pole

Si roller

Sup tilted pole

Sup GR

Drum

Tu GR

Pinch roller

Tu guide

Tu tilted pole

VL-H875U VL-H890U

VL-H870U VL-H875U VL-H890U

5-4-4. Adjusting the Tu guide

After replacement of Tu guide preset and adjust the height. (1) Tu guide height presetting

Adjust the height from the upper surface of mechanism chassis to the upper surface of lower flange with the aid of jig.

(Figure 6)

Lower flange

(2) Adjusting the Tu guide (Figure 7)

1 Playback the alignment tape (VR2ABOPS). 2 Check that the tape runs at the same height near the capstan shaft in case of

V/S F and V/S R.

3 If the tape running position in case of V/S R is higher than the tape running

position in case of V/S F, turn clockwise the Tu guide nat. If the tape running position in case of V/S R is lower than the running position in case of V/S F, turn counterclockwise the Tu guide nat.

5-4-5. Checking the V/S F and R waveforms (Figure 8)

(1) Playback alignment tape (VR2ABOPS), and set the V/S R mode. At this time

ascertain that the waveform crest pitch is kept constant for more than 5 seconds.

(2) Set the V/S F mode. At this time ascertain that the waveform crest pitch is kept

constant for more than 5 seconds. Unless the constant pitch is obtained, execute the checks of Section 4-2, 3, and

5-4-6. Checking after adjustment

(1) Envelope check

1 Playback the alignment tape (VR2ABOPS). 2 Ascertain that the envelope maximum to minimum ratio is 65% or more. (Figure 9) 3 Ascertain that the waveform does not change remarkably. (Figure 10)

Upper flange

Capstan shaft

Pinch roller

Height setting jig

Master plane (JiGMP-MX7U)

Figure 6

Nat

Figure 7

Figure 8

MAX

MIN

Figure 9

MIN

65 (%)

MAX

(2) Rise check

1 Playback the alignment tape (VR2ABOPS). 2 Once eject the cassette, and then load it again. 3 Set the playback mode, and ascertain that the RF waveform rises horizontally

within 2 seconds. At this time ascertain that there is no tape slackness near the pinch roller.

4 After V/S F, R and FF/REW execute playback, and ascertain that the RF

waveform rises horizontally within 2 seconds. At this time ascertain that there is no tape slackness near the pinch roller.

(3) Checking the tape travel

1 When the tape is played back, ascertain that tape lift and tape curl of 0.3 mm

or more do not occur at the lower flange of Si roller, upper flange of Sup GR, upper flange of Tu GR, and upper/lower flange of Tu guide.

2 In case of V/S F and R ascertain that no curl is found at each flange.

Figure 10

Figure 11

5-4-7. Checking and adjusting the playback switching point

Refer to the description of playback switching point adjustment in section of VCR circuit adjustment.

Figure 12

5-6

VL-H870U VL-H875U VL-H890U

5-5. MECHANISM ASSEMBLING AND PARTS REPLACEMENT

(DISASSEMBLING AND ASSEMBLING)

Below is given an explanation of assembling of mechanism and its parts replacement. The removal of cabinet and Circuit Board is explained in the relevant service manual.

Notes

1 After removal of cut washers be sure to replace them with new ones. 2 Do not place the mechanism upside down on the table. Otherwise, the mechanism part may be deformed or damaged, resulting

in malfunction.

3 When assembling, take care so that screw, washer or other foreign substance do not enter. Otherwise mechanism malfunction

may occur.

4 Be sure to use the specified cleaning liquid, oil, grease and screw lock as listed below. Otherwise mechanism malfunction may

occur.

Oil: Cosmo Oil Co., Ltd.

COSMOHYDRO HV100

Greases: Dow Coaning

MORYCOAT YM-103/X5-6020

Screw lock: THREE BOND

1401B

Cleaning liquid: Industrial-use ethyl alcohol

5-5-1. Mechanism modes

To actuate the mechanism, apply DC3 to 4V to the L motor. At this time the L motor connector must have been disconnected in advance. Below is given an explanation of the mechanism mode necessary for mechanism check, adjustment and replacement.

VL-H870U VL-H875U VL-H890U

(1). EJ (Eject) mode (See Figure 1)

In this mode, it is mechanically positioned to eject the cassette. It is the position where the EJECT lever is moved the farthest in the direction A in the S/B mode. (In this mode, the cassette compartment assembly can not be locked.)

EJECT Lever

EJ mode

Figure 1

(3). STOP mode (See Figure 3)

In the STOP mode the S.T pole base is depressed in the STOP position (or Rec Lock position in CAMERA mode), and the S brake is in contact with the S reel disk.

Slide chassis

(2). S/B (Standby) mode (See Figure 2)

When the cassette is loaded, the mechanism is set to the S/B mode. In this mode the slide chassis is most far from the drum. In this mode the Eject lever is in position shown in Figure 2 (in position where the cassette control ass’y can be locked).

Slide chassis

EJECT Lever

S/B mode

Figure 2

(4). PB mode (See Figure 4)

In this mode, it is positioned for the replay, record and so on. It is the mechanical position where the pinch roller is pressed against the capstan shaft to make the pinchpressing spring the most longest.

S pole base

S reel disk

S brake

STOP mode

Figure 3

T pole base

Capstan shaft

Pinch Spring

Pinch roller

PB mode

Figure 4

5-7

VL-H870U

Upper/lower drum ass'y

Motor stator

Stator mounting screw

Phase matching hole

Recognition switch

Cap

Cassette control down switch

Light guide

Adhesive tape

VL-H875U VL-H890U

5-5-2. Cassette control ass’y

(1) Set the unit to the EJECT mode, and let the housing stand upright. Or set the

unit to the STANDBY mode, press the lock lever in the arrow direction, and let the housing stand upright. (See Fig. 5: in the direction

pushing in the direction

, slightly lift the housing by hand to release the lock

lever.)

(2) Remove the four screws 2 and take out the down guide 3.

(3) Slide the two link support shafts

openings

(4) Deflect the roller shafts

on the slide chassis. (Be careful not to deform the inner links.)

on their respective slide chassis slits (two at

a little inward to get them out of the round openings

and the two roller shafts

(1) Set the unit to the STANDBY mode. (2) Deflect the roller shafts

into the round openings

a little inward, and fit them

on the slide chassis. (Be

careful not to deform the inner links.)

(3) Align the flanges of roller shafts

slits

. While sliding the flanges, fit the support shafts

in the slide chassis slits e, and slide them until they

with the slide chassis

reach the slits.

(4) Attach the down guide. (While pressing the guide in the

direction

, tighten the screws until the gap j between the down guide 3 and the support shafts becomes zero.) Tightening torque: 70±7 mN·m (0.7±0.07 kg·cm)

or b) (When

to the round

and two at f).

Lock Lever

Down Guide

Figure 5. Lock lever section

VL-H870U VL-H875U VL-H890U

Screw

5-5-3. Actuating the mechanism with the cassette control ass’y removed

(1) Turn on the power supply with the cabinet and camera unit

(2) Put the cap on the light guide. (3) Press the cassette control down switch through the adhesive

5-5-4. Drum and Drum base

* To replace the upper drum, be sure to put on gloves. Due care is required so that the drum is not damaged. (1) Drum base

Remove the 3 mounting screws as shown in Figure 1, and remove the drum base.

Screw tightening torque (4 locations)

0.069±0.007 N·m (0.7±0.07kg·cm)

removed, referring to the Service Manual (so as to actuate the mechanism).

tape in the arrow direction so as to turn it on. At this time take care to avoid contact with the cassette. Keep the switch pressed (if the switch is turned off, unloading occurs).

Note: To set the Rec mode, press the pin (marked with the

asterisk *) of recognition switch (this operation is not necessary in other modes).

Upper/lower drum ass'y

Mounting screw

Drum base

Earth spring

Positioning hole

Figure 1

5-8

Figure 6

(2) Drum motor stator

Remove the stator mounting screw with the hexagonal wrench as shown in Figure 2, remove the motor stator.

Figure 2

VL-H870U

Balancer mounting screw

Balancer

Upper drum ass'y

Rotary transformer rotor

Positioning pin

Cleaning (shaded area) (holder)

Mounting screw hole

VL-H875U VL-H890U

(3) Upper drum ass’y

Remove the upper drum ass’y from the lower drum ass'y as shown in Figure

3. At this time take care so as not to lose the gap shim.

Upper drum ass'y

Gap shim

Lower drum ass'y

Figure 3

(5) Balancer

Remove the balancer mounting screw as shown in Figure 5, and remove the balancer.

Figure 5

VL-H870U VL-H875U VL-H890U

(4) Motor rotor ass'y and ro-

tary transformer rotor ass'y

Rotor mounting screw

Motor rotor

Remove the 2 rotor mounting screws as shown in Figure 4, and remove the motor rotor

Positioning hole

Upper drum ass'y

and the rotary transformer ass'y.

Positioning pin

Figure 4

Install the upper drum in the reverse order of removal. (1) Balancer

Mount the balancer to the upper drum ass'y with the balancer mounting screw. The screw tightening torque must be 0.1N·m (tighting torque 1kg·cm). (Figure 5)

(2) Motor rotor, rotary transformer rotor ass’y

Clean the contact surfaces of rotor ass’y holder and upper drum ass'y, and ascertain that there are no contamination and flaws. Next, adjust the phase so that the positioning pin of rotor ass'y is inserted into the positioning hole of upper drum, and tight fit the rotor ass'y to the lower surface of upper drum ass'y (Figure

7).

(6) Lower drum ass'y

Remove the FPC mounting screw from the lower drum ass'y as shown in Figure 6.

Rotary transformer Rotor ass'y

FPC mounting screw

Lower drum ass'y

Figure 6

Positioning hole To be aligned with RTr rotor side position pin.

In this state put the motor rotor on the upper surface of upper drum ass'y, and tighten the mounting screw. At this time make sure that the head screw in the three places is visible through the motor rotor hole (Figure 8). The screw tightening torque must be 0.1N·m (1 kg·cm).

Head mounting screw

Screw relief hole

Alignment position (3 pcs.)

Motor rotor

L ch

R ch

Cleaning

Figure 7

Rotor mounting screw

Motor rotor

Mounting screw

Upper drum ass'y

Rotary transformer rotor ass'y

Figure 8

5-9

VL-H870U

Motor stator

Stator set screw

Lo relay gear

Phase alignment mark (Round hole)

Phase alignment mark ( Mark)

Phase alignment mark (Round hole)

Mode switch

VL-H875U VL-H890U

(3) Lower drum ass'y

Tighten the FPC mounting screw to the lower drum ass'y. The screw tightening torque must be 0.08N·m (tighting torque 0.8kg·cm). (Figure 6)

(4) Upper drum ass’y

After fitting the gap shim which was removed when the upper drum ass'y was dismantled to the shaft of lower drum ass’y, fit the upper drum ass’y. (Figure 3) At this time slightly turn the upper drum ass'y by hand to ascertain that RTr does not scrape. If scrape is found, replace the gap shim with the gap shim packaged together with the replacement upper drum ass’y.

(5) Drum motor stator

Fit the motor stator to the shaft. Then, apply the preliminary pressure

0.07N·m (0.7kg) to the motor stator, tighten the stator mounting screw. The tightening torque must be 0.15N·m (1.5kg·cm). Install the stator so that the chassis line is nearly parallel with the motor stator straight section when it is installed on the chassis. (Figure 9)

(6) Drum base

Align the positioning pin, and tighten the screws (3 pcs.).

(7) Drum ass’y

Install the drum ass’y on the main chassis, and tighten the screws (3 pcs.).

(8) Tape guide

Align the positioning pin, and tighten the screw (one pc.).

Arrange parallel.

FPC

Chassis line

Motor stator circuit board

VL-H870U VL-H875U VL-H890U

5-5-5. Phase matching

The phase of the following parts must be matched as shown in the figure below. (Ascertain that the marks and round holes align.)

(1) Lo relay gear (2) Main cam (3) Sub-cam (4) Mode switch

5-6. MECHANISM ASSEMBLING METHOD

(1) Adjust the phase of each part. (2) Install screws and washers. (3) Install the segment gear, T arm guide and the M-function

lever. Install the eject lever.

T arm guide

Segment gear

M-function lever

Figure 9

Move claw to rear side.

Item Tightening torque Quantity a S Tight M1.4 x 3 70mN·m (0.7kgf·cm) 1 B ø0.8-ø3-t0.2 1

5-10

VL-H870U

Make sure not deform the arm.

VL-H875U VL-H890U

VL-H870U VL-H875U VL-H890U

(4) Install the loading block assembly and the capstan motor. (5) Install the drive gear. At this time, pay attention to the

direction of gear. (The small gear must be located in the chassis side.)

Loading motor

Capstan motor

Move FF downwards

Install the motor under this plate.

(7) Install the guide rail assembly taking care to position it

correctly.

A S Tight M1.4 x 2.5 70mN·m 1

a S Tight M1.4 x 3 70mN·m 4

(6) Install the guide rail assembly.

Insert the part in the rail and slide it down.

Drive gear Position the small gear of the drive towards the chassis.

Item Tightening torque Quantity

Make sure not to deform the arm.

Item Tightening torque Quantity A S Tight M1.4 x 2.5 70mN·m 2 B S Tight M1.4 x 4 40mN·m 1 C ø0.8-ø3-t0.2 1 D ø2.1-ø5-t0.25 1 a S Tight M1.4 x 3 70mN·m 1

Align the marks on the parts.

Square Hollow Mark

Round Hole

Triangle Mark

Insert the part in the rail and slide it down.

5-11

Segment gear

Edge A

Su arm Ass'y

T Lo arm Ass'y

VL-H870U

Take care not to bend the tension band during assembly or disassembly.

Pinch lever

Tu guide lever

Tu guide lever SPR

Attach to hook

Take care of position.

Pinch lever

Stopper

The pinch lever is positioned on the stopper.

Secure on back side

Claw

Swing arm

VL-H875U VL-H890U

VL-H870U VL-H875U VL-H890U

(8) Install the drum assembly in the chassis. (9) Install the tape guide in the drum assembly. (10) Install the Si roller.

Si roller

Roller spring

Tape guide

Drum assembly

(11) Install the slide chassis.

T arm guide

Slide this part towards the T arm. Place the slide chassis on the guide rail.

Main cam pin

Sup reel base

Insert the main cam pin into the hole of cam of slide chassis.

Chassis drawing

Item Tightening torque Quantity A S tight M1.7 x L5.3 100mN·m 3 B S tight M1.7 x L2.5 60mN·m 1

Item Tightening torque Quantity A M1.4 x 1.5 ø4 40mN·m 1 B M1.4 x 1.5 ø3.5 40mN·m 3

(12) Install in the following order: T guide lever spring, T guide

lever, pinch lever. (13) Install the swing arm. (14) Install the right guide holder.

Item Tightening torque Quantity A S tight M1.4 x 2.5 70mN·m 1 B CW ø0.8-ø3-t0.2 70mN·m 1

5-12

VL-H870U VL-H875U VL-H890U

6. ADJUSTMENT OF VCR AND CAMERA

6-1. INITIAL SETTING OF E2PROM IC

6-1-1. E2PROM data alterable ways

1) Set the switch of main body to CAM, and use the remote control (RRMCG0033TASA) for adjustment to turn on the adjustment mode.

2) VCR adjustment address setting.

V ADJ

0000 “0000” is blinking After an objective address was established, play key is pushed and set. In addition, numerical change uses a “REW” or “FF” key.

3) VCR adjustment data setting. V ADJ 0000 ## Value of “##” differs by an address.

After an objective data was established, “PLAY” key is pushed and set.

4) When data of other address are changed successively, push “STOP” key, and please repeat operation to 5) from 3).

5) When SW of the substance is turned into off, data are written to E

6-1-2. IC703 (E2PROM)

When the IC703 has been replaced, make the following settings and adjustments.

1. Remove the backup battery (CR2025).

2. Turn power switch to CAMERA.

3. Setting up the V ADJ mode as follows.

* After press the CONTINUE key, press the VCR ADJ key on service

remote control (RRMCG0033TASA).

4. After setting the above data, clear the V ADJ mode and turn off the power

by pull out the battery pack or DC cable. Neglect about 30 seconds after turned of power, because data of address becomes effective after microcomputer is reset. Now the setting of data is completion.

Adjustments to follow Make the system controller servo, VCR, and LCD adjustments according to their respective instructions.

PROM from systematic microcomputer.

H870U H875U H890U address data data data 03 (Specificaton code) 48 4F 4A 02 (Country code) 01 01 01

VL-H870U VL-H875U VL-H890U

6-1-3. Camera adjustment

When the IC2 has been replaced, make the camera adjustment according to its instructions. All the camera adjustment data are written in the E2PROM provided on the lens unit. Therefore, when the lens is replaced, the camera must be adjusted again according to the camera adjusting procedure.

6-2. ADJUSTING THE Y/C, AUDIO AND LCD CIRCUITS ON MODELS WITHOUT A/V IN MODE (A/V IN MODE SET-UP PRODUCE)

1) Set the switch of main body to CAM, and use the remote control (RRMCG0033TASA) for adjustment to turn on the adjustment mode.

2) Set up the adjustment address (example : EE mode adjustment address 14). Once this address has been set up, the A/V IN mode (test mode) is automatically brought and the images appear on the LCD display.

3) Now make the adjustments referring to the instruotions in the manual.

6-3. ADJUSTMENT OF VCR SECTION

6-3-1. Before starting the electric circuit adjustment

• Electric circuit adjustment becomes necessary, in most cases, when any of the wear mechanical parts or the video head has been replaced. Before starting the electric circuit adjustment, be sure to check that the mechanical parts work well (i.e., the mechanical parts have all been perfectly adjusted). In case a trouble or troubles are found in the electric circuitry, be sure to pinpoint the cause(s) by using the measuring instruments described below. After locating the trouble spot(s), then proceed to repair, replacement or adjustment. Do not change the positions of the controls when adequate measuring instruments are not available.

• In order to implement a higher-density, smaller machine, most of the electric circuit parts used on the Circuit Boards are of smallsized, surface-mounted type. For replacing part(s) as after-sales service, work with a soldering iron as speedily as possible. The heat resistance of the surface-mounted components is poor, when compared with the larger-sized discrete parts used for television sets and stationary decks, owning to their small sizes. Therefore, exercise due care to avoid long-time exposure of the pins of these parts to the heat of the soldering iron which may possibly damage them. Such care should be exercised especially for chip-layer capacitor replacement. It is advisable to use a temperature-controlled ceramic soldering iron (temperature at the tip: 250°C, contacting time: less than 5 seconds).

6-1

VL-H870U VL-H875U VL-H890U

< Adjusting the video/LCD section >

• Measuring instruments:

*Color monitor TV set *AC adapter *AV output cable (accessory) *Digital voltmeter *Oscilloscope *Video recording tape *DC power supply *Frequency counter (For Y/C, audio and servo adjustments) *Audio generator (CR oscillator) *Signal generator *DC cable (AC adapter accessory) *Alignment tape (JiGWR5-5NSP) (NTSC pattern generator *Video extension cables (JiGWR5-8NSE) LCG-401/401YC:Leader-made) *Vector scope *Standard tape (JiGWR5-9NS)

6-3-2. Servicing the VCR section Adjustment 6-3-2-1. Typical connections

12345

Configuration <Note: The entries of list> 1. Name 2. Part No. 3. Code

4. Note * Model, Uses Remarks

VL-H870U VL-H875U VL-H890U

1. Extension Cable Inverter~VCR (7pin

2. QCNW-1265TAZZ

3. AX

1. Extension Cable Camera~VCR (18pin)

)

2. QCNW-1270TAZZ

3. AY

1. Extension Cable Camera~VCR (19pin)

2. QCNW-1381TAZZ

3. AX

1. Extension Cable MECHA~VCR (70pin)

2. QCNW-1534TAZZ

3. BS

1. Extension Cable LCD~ VCR (24pin)

2. QCNW-1382TAZZ

3. BD

6 8

insulating sleeve

1. Operation Unit QSW-Z0287TAZZ

* " (FF) Button" func-

1. Connector fitting and withdrawing extractor

1. Connector fitting and withdrawing tweezers

2. 9EQPiNSET06GE

3. BR

1. Service remote control RRMCG0033TASA

3. BT

1. DC-IN Jack Unit

3. AK

4. New tions to as "DISPLAYbutton".

1. Alignment Tape

1. Extension Cable TOUCH PANEL (6pin

2. QCNW-1267TAZZ

3. AX

)

2. JiGWR5-5NSP (NTSC) ....Normal 8 TAPE (MONO)

JiGWR5-8NSE (NTSC) ...Hi8 TAPE (MONO)

* Y/C Audio Alignment

MECHA UNIT

QJAKZ0069TAZZ

L-CABINET UNIT

LCD

UNIT

INVERTER

6-2

VCR UNIT

CAMERA UNIT

VL-H870U VL-H875U VL-H890U

• Types of test modes

TEST No. Sensor on/off

Title

Contents

1 Sensors off All sensors but the cassette controller switch, dew sensor and

battery sensor stay off.

3 Automatic battery sensor Battery sensor’s input voltage put in memory.

adjustment

4 Battery adjustment error Battery sensor’s adjustment errors are displayed at the right of All sensors on

display the “past errors” area. All but sensors

on 5 PASS mode Track shift mode (1/4 shift) All sensors on 6 Camera adjustment mode Camera adjustment mode [VCR

interrupted] 7 VCR adjustment mode VCR adjustment mode 8 Automatic switching point Play standard tape and call this mode. Switching point is

adjustment (STOP ADJ) automatically adjusted.

1 When the battery adjustment mode is selected from the camera adjustment mode with a cassette with the erase protection tab,

the VCR is automatically put in the REC mode.

• Below discussed are these seven test modes. 1 [TEST No. 1] Sensors off mode

All the sensors, except for the cassette controller switch, dew sensor and battery sensor, stay off. This enables to bring the VCR in the loading mode without tape. The VCR/camera performance can now be checked with no tape inside.

2 [TEST No. 3] Automatic battery alarm adjustment

Used to automatically adjust the voltage level which makes the “battery” appear on the LCD display.

3 [TEST No. 4] Battery alarm check/error display

• The difference between the preset battery alarm voltage and the current supply voltage is displayed as follows.

• A past error is displayed at the right of the current battery alarm error.

4 [TEST No. 5] PASS mode

Used to adjust the tape travelling condition. The tracking is shifted by 1/4 from the center to make the tape running-related RF envelope fluctuations easier to observe.

5 [TEST No. 6] Camera adjustment mode

Used to adjust the camera section. (For details, see Servicing the Camera Section.)

6 [TEST No. 7] VCR adjustment mode

Used to adjust the VCR section. (For details, see Servicing the VCR Section.)

7 [TEST No. 8] Automatic switching point adjustment

Used to automatically adjust the playback switching point. (For details, see Automatic Adjustment of the Playback Switching Point.)

VL-H870U VL-H875U VL-H890U

6-3-2-2. Setting up the VCR section adjustment mode (camera section adjustment)

• Select adjustment items by using addresses. Rewrite the adjustment data to change the settings. Below shown the adjustment procedures and on-screen display.

Enlarged view (CAM ADJ) camera V ADJ VCR, LCD 0000 00 (Address) (Data)

Procedural steps

1 Turn up or down the flashing hexadecimal number with the FF or REW key to select the V ADJ

address of a desired adjustment item. (Initial address: 00H) Note: The addresses change as follows. 01FE 01FF 0000 0001 0002

2 Press the PB key to read the data of the selected address. V ADJ

3 Turn up or down the data setting with the FF or REW key. The data display starts flashing. V ADJ

4 Press the PB key again to write the data setting into the selected address. V ADJ

5 Press the STOP key in the above step 2 or 4, and the screen returns back to the step 1. V ADJ

When the FF or REW key is held down for 0.3 second or longer, the address selection is repeated in cycles of 100 msec. The data setting changes by ± 4 by holding the key down for 2 seconds or longer.

T-07

V ADJ

0000 00

Display

( : flashing)

002C A3

002C

002C 72

6-3

VL-H870U VL-H875U VL-H890U

6-3-2-3. Battery shut-off voltage adjusting method

1) Supply power to the main unit, using the variable-voltage DC power supply (range of 2.5V to 5V).

2) Set the CAM/OFF/VCR SW to CAM to switch to the camera mode.

3) Load a recordable tape and set the main unit to CAM REC. PAUSE.

4) Set the main unit to TEST mode No. 3, and start recording.

5) Measure voltage between TL901(+) and TL903(GND), and adjust the supply voltage to 3V.

6) The adjustment is complete if "BATTERY" is displayed on the monitor screen for a second when the PLAY key of operation unit is pressed.

7) The adjustment is regarded as proper if the auto shut-off is actuated after the warning is displayed when the TEST mode is cancelled.

* In case of automatic adjustment of shut-off voltage, adjustment is impossible if voltage is above 3V ± 0.2V.

If the adjustment is made at 2.9V or below, the low-voltage operation may become unstable.

•Type of test modes

<Procedues> To adjust the camera section of this machine, the remote control for servicing (RRMCG0033TASA) is used. Press the "CONTINUE" key → "TEST SEL", this will show [T-01] on the LCD OSD, (01:flashing), and select the below TEST No. with "FF" or :REW" key and set with "PLAY" key. Same procedures of adjustment from now on.

Use the SW2 thru SW9 switches on the adjustment tool to select the following test modes.

VL-H870U VL-H875U VL-H890U

TEST No. Title

Contents

Sensor on/off

1 Sensors off All sensors but the cassette controller switch, dew sensor and

battery sensor stay off.

2 Mechanism adjustment 1 Automatic SP/LP detection prohibited All sensors on

mode 2 Different-mode detection prohibited

3 ATF sampling limited to center

3 Automatic battery sensor Battery sensor’s input voltage put in memory.

adjustment

4 Error display Past errors appear on the counter display of the viewfinder. All sensors on

Battery adjustment error Battery sensor’s adjustment errors are displayed at the right of the All but sensors

display “past errors” area. on 5 PASS mode Track shift mode (1/4 shift) All sensors on 6 Camera adjustment mode Camera adjustment mode [VCR

interrupted] 7 VCR adjustment mode VCR adjustment mode 8 Automatic switching point Play standard tape and call this mode. Switching point is

adjustment (STOP ADJ) automatically adjusted.

1 When the battery adjustment mode is selected from the camera adjustment mode with a cassette with the erase protection tab,

the VCR is automatically put in the REC mode.

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VL-H870U VL-H875U VL-H890U

6-3-3. Adjusting the VCR circuit

• Test Points on the Video Circuit Board

6-3-3-1. Adjusting the power

circuit

a) POWER CIRCUIT ADJUSTMENT PROCEDURE

Turn on power (camera).

1. Adjust to CAM 15V.

2. Check P-CON 4.9V.

3. Check P-CON 3.3V.

4. Check CAM 2.9V.

5. Check LCD 13.5V.

6. Check LCD 7V.

7. Check LCD -15.2V.

POWER CIRCUIT ADJUSTMENT METHOD

Æ Input 9V from DC Jack, and set the power switch to the camera side. ` Don't fail to fix the back light unit befor adjusting them.

1. Adjustment to CAM 15V

5. Checking of LCD 13.5V

Make an adjustment so that the digital voltmeter indicates 15V ± 0.05V.

Measuring instrument Digital voltmeter Measuring terminal TL905 Adjustment address 3EH Standard 15V ± 0.05V

2. Checking of P-CON 4.9V

Check that the digital voltmeter indicates 4.9V ± 0.1V.

6. Checking of LCD 7V

Ascertain that the digital voltmeter indicates 7V + 0.4/-0.2V.

Measuring instrument Digital voltmeter Measuring terminal TL901 Adjustment address Standard 4.9V ± 0.1V

7. Checking of LCD -15.2V

3. Checking of P-CON 3.3V

Ascertain that the digital voltmeter indicates -15.2V ±1V.

Ascertain that the digital voltmeter indicates 3.3V ± 0.1V.

Measuring instrument Digital voltmeter Measuring terminal TL903 Adjustment address Standard 3.3V ± 0.1V

8. Checking of LCD -7V

4. Checking of CAM 2.9V

Ascertain that the digital voltmeter indicates -7V + 0.4/-0.7V.

Ascertain that the digital voltmeter indicates 2.9V± 0.1V.

Measuring instrument Digital voltmeter Measuring terminal TL910 Adjustment address Standard 2.9V ± 0.1V

Æ Turn off power supply.

8. Check LCD -7V.

Æ Turn off power.

Ascertain that the digital voltmeter indicates 13.5V ± 0.2V.

Measuring instrument Digital voltmeter Measuring terminal TL907 Adjustment address Standard 13.5V ± 0.2V

Measuring instrument Digital voltmeter Measuring terminal TL904 Adjustment address Standard 7V + 0.4/-0.2V

Measuring instrument Digital voltmeter Measuring terminal TL906 Adjustment address Standard -15.2V ± 1V

Measuring instrument Digital voltmeter Measuring terminal TL908 Adjustment address Standard -7V + 0.4/-0.7V

6-5

VL-H870U

3H 3H

V sync signal

3H 3H

V sync signal

Horizontal sync signal

Red (approx. 0.6 V )

Approx. 0.3 V

White (approx. 100%)

Burst signal

Approx. 0.7 V

Approx. 0.3 V

p-p

Horizontal sync signal

White (approx. 100%)

Burst signal

Approx. 0.3 V

p-p

Approx. 0.7 V

p-p

Approx. 0.3 V

p-p

Red (approx. 0.6 V )

p-p

VL-H875U VL-H890U

6-3-4. Adjustment of system controller and servo circuit 6-3-4-1. Adjustment of playback switching point

b) CHARGING CIRCUIT ADJUSTMENT PROCEDURE

1) Play back the alignment tape (JiGWR5-5NSP)

2)Press the “CONTINUOUS PUSH” and “TEST MODE SELECTION” of adjustment remote controller to set the test mode.

Measuring instrument Mode Playback Adjustment address 30h Tape Alignment tape (JiGWR5-5NSP)

(At this time the numeral of “TEST01” blinks.)

3)Using the “FF” and “REW” keys, select “TEST08”, and press the playback key to set the SW-P adjustment mode.

4)After a while the adjustment is completed, and operation stops automatically. In case of adjustment failure the tape is ejected automatically.

Only in the case when the satisfactory result was not obtained by the adjusting method described above, perform the following adjustment.

1)Connect each signal to the oscilloscope.

1ch: Video output..... TL3402

2ch: H-SW-P ............ TL404

GND: GND ................. TL7449

2)Play back the alignment tape (JiGWR5-5NSP)

3)Press the “CONTINUOUS PUSH” and “VCR ADJUSTMENT” of adjustment remote controller to set the VCR adjustment mode.

4)Select the address 30h, set the sync slope of oscilloscope to (–), adjust the data with “REW” and “FF” so that the interval between the trigger point and the V sync signal is set to 6H, and fix the data with the “PLAY” button. (See Figure 6.1.1.)

5)Then, set the sync slope to (+), and ascertain that the interval between the trigger point and the V sync signal has been set to 6H. (See Figure 6.1.2.)

6)Keep the STOP key pressed for about 3 seconds to exit from the adjustment mode.

Figure 6.1.1

Oscilloscope

Figure 6.1.2

VL-H870U VL-H875U VL-H890U

6-3-5. Y/C circuit adjustment method

Input signal conditions

Video signals generated by a pattern generator are used to make electric adjustments in a Y/C circuit. Thus this signal must conform to the standards prescribed for adjustment signals. Use an oscilloscope to check that the video signal is terminated with a 75 Ω resistor, the amplitude of the sync signal component, video component and burst signal are approx. 0.3 Vp-p, 0.7 Vp-p and 0.3 Vp-p, respectively and that they are flat. The relative level of the burst signal and the red signal shall be 0.30:0.66. The color bar used in an electrical adjustment is shown in Figure A.

* When a pattern generator is not used

Shoot a color bar chart (JiGCHART-4) using a perfectly adjusted video camera. A signal from a perfectly adjusted video camera shooting a color bar chart (JiGCHART-4) can be used as an adjusting signal if the lighting can be set to meet the following conditions: output (75 Ω terminated), the amplitude of the sync signal component, video component and burst signal are approx. 0.3 Vp-p, 0.7 Vp-p and 0.3 Vp-p, respectively. The relative level of the burst signal and the red signal shall be 0.30:0.66. This is shown in Figure B.

Figure A Color bar signal produced by a pattern generator

Figure B Color bar signal produced by a video camera

1. Adjustment of fixed data writing

ADD 67 68 69 6A 6B 6C 6D 6E 6F 55 66 54 65 5C 64 DATA 01 00 02 01 FA 00 00 66 11 FE FE FE FE 70 C0

Before starting Y/C adjustment, be sure to write the specific data in the addresses listed left. If the data listed left is written after Y/C adjustment, adjusting values may deviate.

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