SHARP 13VT-L200 Diagram

SERVICE MANUAL

S29D413VTL200

TV/VCR COMBINATION

Chassis No. B97B

13VT-L200

MODEL

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 should be used.

CONTENTS

» IMPORTANT SERVICE SAFETY PRECAUTION....................................................................................2

» ELECTRICAL SPECIFICATIONS ............................................................................................................ 6

» LOCATION OF USER’S CONTROL........................................................................................................ 7

» DISASSEMBLY AND REASSEMBL Y ......................................................................................................9

» INSTALLATION AND SERVICE INSTRUCTIONS................................................................................. 12

» PRECAUTIONS IN REASSEMBLING ................................................................................................... 17

» FUNCTION OF MAJOR MECHANICAL PARTS....................................................................................18

» ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS ...................................20

» ADJUSTMENT OF THE VCR ELECTRICAL CIRCUITRY ....................................................................40

» TROUBLESHOOTING........................................................................................................................... 43

» CHASSIS LAYOUT ................................................................................................................................ 56

» BLOCK DIAGRAM OF TV SECTION.....................................................................................................58

» BLOCK DIAGRAM OF VCR SECTION ................................................................................................. 60

» OVERALL SCHEMATIC DIAGRAM.......................................................................................................70

» DESCRIPTION OF SCHEMATIC DIAGRAM......................................................................................... 72

» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................... 84

» REPLACEMENT PARTS LIST............................................................................................................... 88

» PACKING OF THE SET ....................................................................................................................... 105

13VT-L200

Page

SHARP CORPORATION

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

13VT-L200

IMPORTANT SERVICE SAFETY PRECAUTION

Service work should be performed only by qualified service technicians who are thoroughly familiar with all safety checks and servicing guidelines which follow:

WARNING

1. For continued safety, no modification of any circuit should be attempted.

2. Disconnect AC power before servicing.

3. Semiconductor heat sinks are potential shock hazards when the chassis is operating.

4. The chassis in this receiver has two ground systems which are separated by insulation material. The nonisolated (hot) ground system is for the B+ voltage regulator circuit and the horizontal output circuit.The isolated ground system is for the low B+ DC voltages and the secondary circuit of the high voltage transformer. To prevent electrical shock use an isolation transformer between the line cord and power receptacle, when servicing this chassis.

CAUTION: FOR CONTINUED PROTECTION AGAINST A RISKOF FIRE, REPLACE

4A 125V

ONLY WITH SAME TYPE 4A125V FUSE.

SERVICING OF HIGH VOLTAGE SYSTEM AND PICTURE TUBE

When servicing the high voltage system, remove the static charge by connecting a 10k ohm resistor in series with an insulated wire (such as a test probe) between the picture tube ground and the anode lead. (AC line cord should be disconnected from AC outlet.)

1. Note that the picture tube in this receiver employs integral implosion protection.

2. Replace with tube of the same type number for continued safety.

3. Do not lift picture tube by the neck.

4. Handle the picture tube only when wearing shatterproof goggles and after discharging the high voltage anode completely.

X-RADIATION AND HIGH VOLTAGE LIMITS

1. Be sure all service personnel are aware of the procedures and instructions covering X-radiation. The only potential source of X-ray in current solid state TV receivers is the picture tube. However, the picture tube does not emit measurable X-Ray radiation if the high voltage is as specified in the "High Voltage Check" instructions. It is only when high voltage is excessive that Xradiation is capable of penetrating the shell of the picture tube including the lead in glass material. The important precaution is to keep the high voltage below the maximum level specified.

2. It is essential that servicepersonel have available at all times an accurate high voltage meter. The calibration of this meter should be checked periodically.

3. High voltage should always be kept at the rated value

-no higher. Operation at higher voltages may cause a failure of the picture tube or high voltage circuitry and;also, under certain conditions, may produce radiation that exceeds specifications.

4. When the high voltage regulator is operating properly there is no possibility of an X-radiation problem. Every time a color chassis is serviced, the brightness should be tested while monitoring the high voltage with a meter to be certain that the high voltage does not exceed the specified value and that it is regulating correctly.

5. Do not use a picture tube other than that specified or make unrecommended circuit modifications to the high voltage circuitry.

6. When trouble shooting and taking test measurements on a receiver with excessive high voltage, avoid being unnecessarily close to the receiver. Do not operate the receiver longer than is necessary to locate the cause of excessive voltage.

IMPORTANT SERVICE SAFETY PRECAUTION

(Continued)

13VT-L200

BEFORE RETURNING THE RECEIVER (Fire & Shock Hazard)

Before returning the receiver 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 receiver.

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

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

» Plug the AC cord directly into a 120 volt AC outlet,

(Do not use an isolation transformer for this test).

» Using to clip leads, connect a 1.5k ohm, 10 watt

resistor paralleled by a 0.15µF capacitor in series with all exposed metal cabinet parts and a known earth ground, such as electrical conduit or electrical ground connected to earth ground.

» Use an AC voltmeter having with 5000 ohm per volt,

or higher, sensitivity to measure the AC voltage drop across the resistor.

» Connect the resistor connection to all exposed metal

parts having a return to the chassis (antenna, metal cabinet, screw heads, knobs and control shafts, escutcheon, etc.) and measure the AC voltage drop across the resistor. AII check must be repeated with the AC line cord plug connection reversed. (If necessary, a nonpolarized adapter plug must be used only for the purpose of completing these check.) Any current measured must not exceed 0.5 milliamp. Any measurements not within the limits outlined above are indicative of a potential shock hazard and corrective action must be taken before returning the instrument to the customer.

VOLTMETER

1.5k ohm 10W

0.15µF

TEST PROBE

TO EXPOSED METAL PARTS

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CONNECT TO KNOWN EARTH GROUND

SAFETY NOTICE

Many electrical and mechanical parts in television receivers have special safety-related characteristics. These characteristics are often not evident from visual inspection, nor can protection afforded by them be necessarily increased by using replacement components rated for higher voltage, wattage, etc. Replacement parts which have special safety characteristics are identified in this manual; electrical components having such features are identified by " å " and shaded areas in the Replacement Parts Lists and Schematic Diagrams.

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For continued protection, replacement parts must be identical to those used in the original circuit. The use of a substitute replacement parts which do not have the same safety characteristics as the factory recommended replacement parts shown in this service manual, may create shock, fire, X-radiation or other hazards.

13VT-L200

PRECAUTIONS A PRENDRE LORS DE LA REPARATION

Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants.

A VERTISSEMENT

1. N'entreprendre aucune modification de tout circuit. C'est dangereux.

2. Débrancher le récepteur avant toute réparation.

3. Les déversoirs thermiques à semi-conducteurs peuvent présenter un danger de choc électrique lorsque le réceqteur est en marche.

4. Le châssis de ce récepteur a deux systèmes de mise à la terre qui sont séparés par un matériau isolant. Le système de mise à la terre non-isolée (chaud) est pour le circuit du régulateur de tension B+ et le circuit de sortie horizontale. Le système de mise à la terre isolé est pour les basses tensions C. C. B+ et le circuit secondaire du transformateur de haute

PRECAUTION:POUR LA PROTECTION CONTINUE CONTRE LES RISQUES

4A 125V

tension.

D'INCENDIE, REMPLACER LE FUSIBLE P AR UN FUSIBLE DE MEME TYPE 4A-125V.

REP ARA TION DU SYSTEME A HAUTE TENSION ET DU TUBE-IMAGE

Lors de la réparation de ce systéme, supprimer la charge statique en branchant une résistance de 10 k en série avec un fil isolé (comme une sonde d'essai) entre la mise à la terre du tube-image et le fil d'anodel. (Le corden d'alimentation doit être retiré de la prise murale.)

1. Il est à noter que le tube-image de ce récepteur est intégralement protégé contre l'implosion.

2. Par mesure de sécurité, changer le tube-image pour un tube du même numéro de type.

3. Ne pas lever le tube-image par son col.

4. Ne manipuler le tube-image qu'en porant des lunettes incassables et qu'après avoir déchargé totalement la haute tension.

LIMITES DES RADIATIONS X ET DE LA HAUTE TENSION

1. Tout le personnel réparateur doit être instruit des instructions et procédés relatifs aux radiations X. Le tube-image, seule source de rayons X dons les téleviseurs transistorisés, n'émet pourtant pas de rayons mesurables si la haute tension est maintenue à un niveau préconisé dans la section "Vérification de la haute tension". C'est seulement quand la haute tension est excessive que les rayons X peuvent entrer dans l'enveloppe du tube-image y compris le conducteur de verre. Il est important de maintenir la haute tension en-dessous du niveau spécifié.

2. Il est essentiel que le réparateur ait sous la main un voltmètre à haute tension qui doit être périodiquement étalonné.

3. La haute tension doit toujours être maintenue à la valeur de régime-et pas plus haute. L'opération à des tensions plus élevées peut entraîner une panne du tube-image ou du circuit à haute tension et, dans certaines conditions, peut entraîner une radiation dépassant les niveaux préscrits.

4. Quand le régulateur à haute tension fonctionne correctement, il n'y a aucun problème de radiation X. Chaque fois qu'un châssis couleurs est réparé, la luminosité doit être examinée bout en contrôlant la haute tension à l'aide d'un voltmètre pour s'assurer que la haute tension ne dépasse pas la valeur spécifiée et qu'elle soit correctement réglée.

5. Ne pas utiliser un tube-image autre que celui spécifié et ne pas effectuer de modifications déconseillées du circuit à haute tension.

6. Lors de la recherche des pannes et des mesures d'essai sur un récepteur qui présente une haute tension excessive, éviter de s'approcher inutilement du récepteur. Ne pas faire fonctionner le récepteur plus longtemps que nécessaire pour localiser la cause de la tension excessive.

13VT-L200

2 2

PRECAUTIONS A PRENDRE LORS DE LA REPARATION

(Suite)

VERIFICATIONS CONTRE L'INCEN-DIE ET LE CHOC ELECTRIQUE

Avant de rendre le récepteur à l'utilisateur , effectuer les vérifications suivantes.

1. Inspecter tous les faisceaux de câbles pour s'assurer que les fils ne soient pas pincés ou qu'un outil ne soit pas placé entre le châssis et les autres pièces métalliques du récepteur.

2. Inspecter tous les dispositifs de protection comme les boutons de commande non-métalliques, les isolants, le dos du coffret, les couvercles ou blindages de réglage et de compartiment, les réseaux de résistance-capacité, les isolateurs mécaniques, etc.

3. S'assurer qu'il n'y ait pas de danger d'électrocution en vérifiant la fuite de courant, de la facon suivante:

» Brancher le cordon d'alimentation directem-ent à une

prise de courant de 120V. (Ne pas utiliser de transformateur d'isolation pour cet essai).

» A l'aide de deux fils à pinces, brancher une résistance

de 1,5 k 10 watts en parallèle avec un condensateur de 0,15µF en série avec toutes les pièces métalliques exposées du coffret et une terre connue comme une conduite électrique ou une prise de terre branchée à la terre.

» Utiliser un voltmètre CA d'une sensibilité d'au moins

5000 /V pour mesurer la chute de tension en travers de la résistance.

» T oucher avec la sonde d'essai les pièces métalliques

exposées qui présentent une voie de retour au châssis (antenne, coffret métallique, tête des vis, arbres de commande et des boutons, écusson, etc.) et mesurer la chute de tension CA en-travers de la résistance. Toutes les vérifications doivent être refaites après avoir inversé la fiche du cordon d'alimentation. (Si nécessaire, une prise d'adpatation non polarisée peut être utilisée dans le but de terminer ces vérifications.) T ous les courants mesurés ne doivent pas dépasser 0,5 mA. Dans le cas contraire, il y a une possibilité de choc électrique qui doit être supprimée avant de rendre le récepteur au client.

Voltmètre CA

1.5k ohm 10W

0.15µF

SONDE D'ESSAI

AUX PIECES METALLIQUES

TO EXPOSED

EXPOSEES

METAL PARTS

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BRANCHER A UNE TERRE CONNUE

CONNECT TO KNOWN EARTH GROUND

AVIS POUR LA SECURITE

De nombreuses pièces, électriques et mécaniques, dans les téléviseurs présentent des caractéristiques spéciales relatives à la sécurité, qui ne sont souvent pas évidentes à vue. Le degré de protection ne peut pas être nécessairement augmentée en utilisant des pièces de remplacement étalonnées pour haute tension, puissance, etc. Les pièces de remplacement qui présentent ces caractéristiques sont identifiées dans ce manuel; les pièces électriques qui présentent ces particularités sont

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identifiées par la marque " å " et hachurées dans la liste des pièces de remplacement et les diagrammes schématiques. Pour assurer la protection, ces pièces doivent être identiques à celles utilisées dans le circuit d'origine. L'utilisation de pièces qui n'ont pas les mêmes caractéristiques que les pièces recommandées par l'usine, indiquées dans ce manuel, peut provoquer des électrocutions, incendies, radiations X ou autres accidents.

13VT-L200

VHF/UHF ANTENNA INPUT IMPEDANCE: 75 ohm unbalanced

ELECTRICAL SPECIFICATIONS

TV SECTION

POWER INPUT: 120 V AC 60 Hz

POWER RATING: 65 W

PICTURE SIZE

Width: 37.8 cm

Height: 38.7 cm

Depth: 38.2 cm

CONVERGENCE: Magnetic

SWEEP DEFLECTION: Magnetic

FOCUS: Hi-Bi-Potential Electrostatic

INTERMEDIATE FREQUENCIES

Picture IF Carrier Frequency: 45.75 MHz

Sound IF Carrier Frequency: 41.25 MHz

Color Sub-Carrier Frequency: 42.17 MHz (Nominal)

AUDIO POWER OUTPUT RATING: 0.8 W (at 10% Distortion)

SPEAKER

Size: 5 × 9 cm (2" × 31/2")

Voice Coil Impedance: 16 ohm at 400 Hz

TUNING RANGES

VHF-Channels: 2 thru 13

UHF -Channels: 14 thru 69

CATV Channels: 1,14 thru 125 (EIA, Channel Plan)

VCR SECTION

Video Recording System: Rotary Two-Head Helical Scanning

Number of Video Heads: 4 pcs.

Video Signal Standard: NTSC Color System

Maximum Recording Time: (SP)160 min (T-160)

Operating Temperature: 5°C to 40°C (41°F to 104°F)

Storage Temperature: -20°C to 60°C (-4°F to 140°F)

Specifications are subject to change without prior notice.

Format: VHS Standard

Tape Width: 12.7mm (1/2inch)

Tape Speed: (SP)33.35mm/sec (1.31 i.p.s)

(LP)16.67mm/sec (0.66 i.p.s) Play back only (EP)11.12 mm/sec (0.44 i.p.s)

(EP)480 min (T-160) Video Input: 0.5 to 2.0 Vp-p, 75 ohm unbalanced Audio Input: -8 dB, 47k ohm unbalanced (0 dB-0.775 Vrms)

LOCATION OF USER'S CONTROL

Description Of Controls

FRONT

13VT-L200

REAR

13VT-L200

LOCATION OF USER'S CONTROL (Continued)

Location Of Control’s Buttons (Remote Control)

Remote Control Battery Installation

Before using the television, prepare the Remote Control.

Battery Cover

Pull Up

» Remote the battery cover as shown and insert two batteries (size

“AA”) making sure the polarity matches the (+) and (–) marks inside the battery conpartment.

13VT-L200

DISASSEMBLY AND REASSEMBL Y

1. Remove the 7 rear cover fixing screws and detach the rear cover.

2. Take out the anode cap, CRT PWB, connectors K and M, coating earth, Speaker chip fixing screws and others.

3. Take out the main PWB unit and the VCR unit.

4. Remove the 5 VCR fixing screws, and detach the shielding case.

13VT-L200

DISASSEMBLY AND REASSEMBLY (Continued)

5. Remove the 4 cassette housing control fixing screws, and detach the cassette housing control.

6. Remove the 2 mechanism chassis angle fixing screws, and remove the 1 head amp shielding case fixing screw.

7. Remove the 3 mechanism chassis fixing screws, and detach the mechanism chassis from the main PWB.

8. Remove the 2 main PWB fixing screws, and detach the main PWB.

9. Remove the 2 power PWB fixing screws, and detach the power PWB

13VT-L200

DISASSEMBLY AND REASSEMBLY (Continued)

For servicing any of the components inside, disconnect the lead dressing holder. Position the main PWB unit upright as shown below and connect the leads for starting the services.

FRONT

13VT-L200

INSTALLATION AND SERVICE INSTRUCTIONS

Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic

screwdriver or TV alignment tools.

(2) Before performing adjustment, TV set must be on at least 15 minutes.

CIRCUIT PROTECTION

The receiver is protected by a 4.0A fuse (F701), mounted on PWB-A, wired into one side of the AC line input.

X-RADIATION PROTECTOR CIRCUIT TEST

After service has been performed on the horizontal deflection system, high voltage system, or B+ system, test the X-Radiation protector circuit to ascertain proper operation as follows:

1. Apply 120V AC using a variac transformer for accurate input voltage.

2. Allow for warm up and using the remote controller, set the brightness level and contrast level to maximum.

3. Check the voltage of test point TP653. (It’s voltage should be about 10.1V DC.)

4. Apply external 13.1V DC at TP653 by using an external DC supply. The increased voltage will cause the horizontal oscillator to stop and the TV to shut off.

5. To re-start the oscillator, remove the external DC power supply and short together TP651 and TP652. Once the TV set operates normally again, remove the short between TP651 and TP652.

HIGH VOLTAGE CHECK

High voltage is not adjustable but must be checked to verify that the receiver is operating within safe and efficient design limitations as specified checks should be as follows:

1. Connect an accurate high voltage meter between ground and anode of Picture tube.

2. Operate receiver for at least 15 minutes at 120V AC line voltage, with strong air signal or properly tuned in test signal.

3. Set to Service mode on, "Mute" and bus data 1(Ymute on).

4. The voltage should be approximately 25.4kV (at zero beam). If a correct reading cannot be obtained, check circuitry for malfunctioning components. After the voltage test, "Mute" and bus data "0" (Ymute off).

13VT-L200

The L-series SHARP TV/VCR COMBINA TION have most of the analog setup adjustments eliminated. Coil and variable resistor adjustments are now performed digitally by using the remote controller or set’s volume and channel change function buttons. Note: There are still a few analog adjustments in the L-series such as 120V adjust, focus, master screen

voltage and coils in the picture IF/detector circuit. Follow the steps below, whenever service adjustment is required. See "T able-B" to determine, if service adjustments are required.

1. Service mode

Berfore putting unit into the service mode, check that customer adjustments are in the normal mode, use the reset function in the video adjust menu to ensure customer controls are in their proper (reset) position.

To enter the service mode

Plug in a television set, during push S2507 (CH-up). When successfuly entered, the service mode will be displayed as shown in Figure A.

To exit service mode

Turn off the power or unplug the set.

2. Adjustment Item selection

Once in the service mode, press the channel up or channel down button on the remote controller or at the set (T able-A). Select the item you wish to adjust.

3. Data number selection

Press the volume up or down button to adjust the data number in the upper right hand side of the screen.

PICTURE: 16 2

Figure A.

13VT-L200

Table - A

ADJUSTMENT ITEM

PICTURE 16 0~63 TINT 39 0~77 COLOR 13 0~63 BRIGHT 32 0~63 SHARPNESS 7 0~13 VERTICAL PHASE 0 0~7 H-PHASE 20 0~31 RF-AGC 18 0~63 V-AMP 32 0~63 PIF-VCO 40 0~127 R CUT-OFF 0 0~255 G CUT -OFF 0 0~255 B CUT-OFF 0 0~255 G GAIN 128 0~255 B GAIN 128 0~255 Y-MUTE 0 0~2 "0"= Normal raster, "1"= no"Y",

BALANCE 32 0~63 TEXT BOX 15 0~127 TEXT PICTURE 20 0~80 CCD LEVEL 7 0~10 OPTION 1 0~3

INTIAL VALUE RANGE

DATA

ADJUSTMENT COMMENTS

"2"= No Vertical

*No adjustment is required due to proper setting being made by IC2001 automatically.

Table - B

PART REPLACED

IC2001 X

IC401 X

IC2101 X

CRT X

NECESSARY UNNECESSARY

ADJUSTMENT

NOTE

Data is stored in IC2101. The adjustment is needed to compensate for characteristics

of parts including IC401. Initial setting values are written from IC2001. Adjust for best

results. Adjust items related to picture tube only.

SERVICE ADJUSTMENT

13VT-L200

VCO Adjustment

1. Connect a digital voltmeter between pin (44) of IC401 and ground.

2. Select a good local channel.

3. Enter the service mode. select adjustment item PIFVCO and data value "40".

4. Adjust the VCO coil L202 so that the digital voltmeter reads 2.5 volts.

5. Adjustment is complete, remove the voltmeter, return to "normal" mode.

RF AGC Adjustment

1. Have unit receive a good local channel.

2. Enter the service mode and select service adjustment item "RF-AGC".

3. Set the data value to point where no noise or beat appears.

4. Select another channel to confirm that no noise or beat appears. Note 1: You will have to come out of the service

mode to select another channel.

Note 2: Setting the data to "0" will produce a black

raster.

Screen Adjustment

1. Select a good local channel.

2. Enter the service mode and select service adjustment item "COLOR" and set the data value to "0" to set the color level to minimum. You may skip this step, if you selected a B/W picture or monoscope pattern.

3. Select service adjustment item "Y-MUTE" and adjust the data value to "1", this turns off the luminance signal (Y-mute).

4. Select service adjustment item "BRIGHT" and set the value to "32".

5. Adjust the master screen cotrol untill raster darkens to the point where raster is barely seen.

6. Adjust service adjustments item "R-CUT OFF" red "G-CUT OFF" green and "B-CUT OFF" blue to obtain a good grey scale with normal whites at low brightness level.

7. Select service adjustment item "MUTE" and reset data to "0". Select service adjustment item "COLOR" and reset data to obtain normal color level.

White Balance Adjustment

1. Have unit receive a good local channel.

2. Enter the service mode. Select service adjustment item "COLOR" and set to "0" (minimum color). "COLOR" does not have to be adjusted if you selected a B/W picture or monoscope pattern.

3. Alternately adjust service adjustment data of "G GAIN" and "B GAIN" untill a good grey scale with normal whites is obtained.

4. Select service adjustment item "COLOR" and adjust data to obtain normal color level.

Picture Adjustment

1. Have unit receive a good local channel.

2. Make sure the customer picture control is set to maximum.

3. Enter the service mode and select service adjustment item "PICTURE".

4. Adjust the data value to achieve normal contrast range.

Tint Adjustment

1. Have unit receive a good local channel.

2. Set customer tint control to center of it’s range.

3. Enter the service mode and select service adjustment item "TINT".

4. Adjust "TINT" data value to obtain normal flesh tones.

Color Adjustment

1. Have unit receive a good local channel.

2. Make sure the customer color control is set to center position .

3. Enter the service mode and select service adjustment item "COLOR".

4. Adjust "COLOR" data value to obtain normal color level.

Brightness Adjustment

1. Have unit receive a good local channel.

2. Make sure the customer brightness control is set to center position.

3. Enter the service mode and select service adjustment item "BRIGHT".

4. Adjust "BRIGHT" data value to obtain normal brightness level.

13VT-L200

Vertical-Size adjustment

1. Have unit receive a good local channel.

2. Enter the service mode and select service adjustment item "V-AMP".

3. While observing the top and bottom of the screen, adjust "V-AMP" data value to proper vertical size and linearity.

Horizontal Position Adjustment

1. Have unit receive a good local channel.

2. Enter the service mode and select service adjustment item "H-PHASE".

3. Adjust "H-PHASE" data value so that picture is centered.

Caption Position Adjustment (Horizontal)

1. Have unit receive a good local channel.

2. Enter the service mode and select service adjustment item "TEXT BOX".

3. A black text box appears on the screen. (See Figure B. below.)

4. Adjust "TEXT BOX" data value so that text box is positioned in the center of the screen.

Figure B.

13VT-L200

END SENSOR

REC TIP SW

AL Connector

AE Connector

AC Connector

START SENSOR

PRECAUTIONS IN REASSEMBLING

MOUTING THE CASSETTE CONTROLLER

Initial setting is indispensable before placing the cassette controller in the mechanism. The initial setting is made in two ways;electrical and mechanical.

Electrical setting:

Make a short-circuit between TP7701 and TP7702 and be sure that the mechanism is back to its initial setting position (*1). Now place the cassette controller in position.(This method is used when the mechanism has been already set on its PWB.)

Pulley feed gear

Casecon drive gear

Screwdriver

Drive angle of

Large tooth

cassette control

Mechanical setting:

Turn the loading motor’s pulley feed gear using a screwdriver and be sure that the mechanism is back to its initial setting position (*1). Now place the cassette controller in position.(This method is applicable for the mechanism alone.)

COUPLING THE MECHANISM TO THE PWB

Match the mechanism’s projections with the two symbols (round reference and oval sub-reference) on the main PWB. Place the mechanism straight down in position with due care so that the mechanism chassis’s outer edges should not damage any parts nearby. Tighten up the two screws (one for fixing the mechanism and the head amplifier shield, the other on the main PWB’s soldering side and located near the loading motor) to fix the mechanism and main PWB. Reconnect the FFC cables (MH and AA, ME and AD, Drum Unit and AH) between the mechanism and main PWB. Parts to pay attention to:

Start and end sensors Q7703, Q7704 Record tip switch S7701

Take special care of the connectors (board to board; AC, AE, AL) between the mechanism and main PWB.

13VT-L200

FUNCTION OF MAJOR MECHANICAL PARTS (TOP VIEW)

Take-up Pole Base Ass'y

Automatic Head Cleaner Ass'y

A/C Head Ass'y

Fixing Guide

Full Erase Head

Supply Pole Base Ass'y

Sup Main Brake Ass'y

Drum Ass'y

Drum Motor

Pinch Roller Lever Ass'y

Pinch Drive Cam

Reverse Guide

Lever Ass'y

Pinch Drive Lever Ass'y

Tension Arm Ass'y

No. Function

1. Full erase head ass’y Erase the old recording on the tape in the recording mode.

3. Tension arm ass’y Detects the tension of tape while running, and brakes the supply reel disk via the tension band.

7. Sup Main brake lever Brakes the supply reel disk to prevent tape slackening when the unit is stopped in fast forward or rewind mode.

9. Main take-up brake lever Brakes the take-up reel disk to prevent tape slackening when the unit is stopped in fast forward or rewind mode.

Supply Reel Disk

Idler Wheel Ass'y

Take-up Reel Disk

Motor

No. Function

13. Reverse guide lever ass’y Pulls out the tape and controls the tape drive train height with the upper and lower guides.

16. Pinch roller lever ass’y Press-fits the tape to the capstan during tape running.

18. Loading motor A motive power which drives the mechanism. It transmits the power to the master cam and cassette housing control ass'y.

Casecon

Drive Gear

Tu Main

Brake Ass'y

13VT-L200

Capstan D. D. Motor

Drive Belt

Slow Brake

Master Cam

Casecon Drive Gear

Clutch Lever

Limiter Pulley Ass'y

Shifter

FUNCTION OF MAJOR MECHANICAL PARTS (BOTTOM VIEW)

No. Function

1. Slow brake Gets in contact with the capstan D.D. motor linking to the master cam in the slow still mode, and brakes it to a certain degree.

3. Capstan D.D. motor A motive power which runs the tape. It transmits the power via the Drive belt.

4. Drive belt Transmits the power to run the tape to the Limiter pulley.

No. Function

6. Limiter pulley ass’y Transmits the power of the capstan D.D. motor to the reel disk via the drive idler.

Shifter Transmits the operation of the master cam to break ass’y, Ioading gear, tension arm and clutch lever.

Take-up loading gear Shifts the take-up pole base and guide roller via the loading gear T, and applies the tape around the drum assembly, as well as transmits the power to the loading gears.

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ADJUSTMENT, REPLACEMENT AND ASSEMBLY OF MECHANICAL UNITS

The explanation given below relates to the on-site general service (field service) but it does not relates to the adjustment and replacement which need high-grade equipment, jigs and skill. For example, the drum assembling, replacement and adjustment service must be performed by the person who have finished the technical courses.

MECHANISM CONFIRMATION ADJUSTMENT JIG

So as to perform completely the mechanism adjustment prepare the following special jigs. So as to maintain the initial performance of the machine the maintenance and check are necessary. Utmost care must be taken so that the tape is not damaged. If adjustment needs any jig, be sure to sue the required jig.

No. Jig ltem Part No. Code Configuration Remarks

This cassette torque meter is used

1. Torque Cassette Meter JiGVHT-063 CZ

JiGTG0090 CM

Torque Gauge

JiGTG1200 CN

for checking and adjusting the torque of take-up for measuring tape back tension.

These Jigs are used for checking and adjusting the torque of take-up and supply reel disks.

3. Torque Gauge Head JiGTH0006 AW

4. Torque Driver JiGTD1200 CB

Master Plane Jig and

Reel Disk Height Adjusting Jig

Tension Gauge

Pinch pressing force

7. JiGADP003 BK

measuring jig

Hex Wrench (1.2 mm) JiGHW0012 AE

8. Hex Wrench (1.5 mm) JiGHW0015 AE

JiGRH0002 BR

JiGMP0001 BY

JiGSG2000 BS

JiGSG0300 BF

When fixing any part to the threaded hole using resin with screw, use the jig. (Specified torque 5 kg)

These Jigs are used for checking and adjusting the reel disk height.

There are two gauges used for the tension measurements, 300 g and

2.0kg.

This Jig is used with the tension gauge. Rotary transformer clearance adjusting jig.

These Jigs are used for loosening or tightening special hexagon type screws.

Reverse guide height

adjusting box driver

JiGDRiVER11055

This Jig is used for height adjustment of the reverse guide (for reverse guide height adjustment).

No. Jig ltem Part No. Code Configuration Remarks

These tapes are especially used for electrical fine adjustment.

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Alignment Tape

10.

Guide roller height

11.

adjustment drive

X value adjustment

12.

gear type screw driver

Reverse Guide Height

13. Adjusting Jig

VROATSV CD

VRONBZGS VROEBZCS

JiGDRiVERH-4

JiGDRiVER-6

JiGRVGH-F18

Video Audio Hi-Fi Audio Track 525 Monoscope 7k — 58µm NTSC Color Bar 1k — 58µm

46/58

525 Monoscope 525 Monoscope

7k 1k

— —

µm

19µm

This screwdriver is used for adjusting the guide roller height.

For X value adjustment

This Jig is used for height adjustment of the reverse guide.

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MAINTENANCE CHECK ITEMS AND EXECUTION TIME

Perform the maintenance with the regular intervals as follows so as to maintain the quality of machine.

Maintained

Parts

Guide roller ass’y

500 hrs.

1000 hrs.

1500 hrs.

2000 hrs.

3000 hrs.

Possible symptom

encountered

Abnormal rotation or significant vibration requires replacement.

Remarks

Sup Guide Shaft Retaining guide Slant pole Full-erase head Color and beating

A/C head

Upper and lower drum ass’y

Capstan D.D. Motor

Pinch roller

Reel belt

Tension band ass’y Screen swaying

Lateral noises Head occasionally blocked

Small sound or sound distortion

Poor S/N ratio, no color Poor flatness of the envelope with alignment tape

No tape running, uneven color

No tape running, tape slack

No tape running, tape slack, no fast forward/ rewind motion

Clean tape contact part with the specified cleaning liquid.

Clean tape contact area with the specified cleaning liquid.

Clean rubber and rubber contact area with the specified cleaning liquid.

Loading Motor

Idler ass’y Limiter pulley Supply/take-up Main brake levers Tape slack

NOTE: : Part replacement. : Cleaning : Oil refilling <Specified> Cleaning liquid Industrial ethyl alcohol

* This mechanism does not need electric adjustment with variable resistor. Check parts. If any deviation is found, clean

or replace parts.

Cassette not loaded or unloaded

No tape running, tape slack

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REMOVING AND INSTALLING THE CASSETTE HOUSING

• Removal

1. In the cassette eject mode, remove the cassette.

2. Unplug the power cord.

3. Remove in the following numerical order. a) Remove two screws 1. b) Slide and pull up the cassette housing control.

Notes:

1. When fitting the S/E sensor holder to the cassette controller frame L/R, take care.

2. Misengagement of teeth of casecon drive gear and drive angle gear causes malfunction. (The cassette cannot be set, load and ejection are repeated).

3. In the case when you use the magnet screw driver, never approach the magnet driver to the A/C head, FE head, and drum.

4. When installing or removing, take care so that the cassette housing control and tool do not contact the guide pin or drum.

5. After installing the cassette housing control once perform cassette loading operation.

TO RUN A TAPE WITHOUT THE CASSETTE HOUSING CONTROL ASSEMBLY

1. Short-circuit TP7701 and TP7702.

2. Plug in the power cord.

3. Turn on the power.

4. Open the lid of a cassette tape by hand.

5. Hold the lid with two pieces of vinyl tape.

6. Set the cassette tape in the mechanism chassis.

7. Stabilize the cassette tape with a weight (500g) to

prevent floating.

8. Perform running test.

Figure 1-1.

• Reassembly

1. Before installing the cassette housing control, shortcircuit TP7701 and TP7702 provided at the left of the main PWB, prug in the power cord. The casecon drive gear turns and stops when the positioning mark appears. Engage two teeth of casecon drive gear with the three teeth of casecon drive angle gear, and set on the mechanism chassis as shown below.

Casecon drive gear

Casecon drive angle gear

500g

Weight to prevent float (500g)

Mechanism chassis

Figure 1-3.

Notes:

1. The weight should not be more than 500g.

2. Take care not to damage the tape when the Cassette is set in the mechanism shassis or taken out of it because the supply/take-up poles are shifted foward the tape loading direction in the EJECT position.

Figure 1-2.

2. Install in the reverse order of removal.

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REEL DISK REPLACEMENT AND HEIGHT CHECK

• Removal

1. Remove the cassette housing control assembly.

2. Pull the tension band out of the tension arm ass'y.

3. Remove the Sup/Tu main brake ass'y.

4. Open the hook at the top of the reel disk, and remove the reel disk.

Note:

Take care so that the tension band ass'y and main brake ass'y (especially soft brake) are not deformed.

Tension arm ass'y

Sup main brake ass'y

Tension band ass'y

Supply reel disk

Tu main brake ass'y

Take-up reel disk

4. Assemble the Sup main brake ass'y.

Notes:

1. When installing the reel disk, take due care so that the tension band ass'y is not deformed and grease does no adhere.

2. Do not damage the Sup main brake ass'y. Be careful so that grease does not adhere to the brake surface.

• Reassembly (Take-up reel disk)

1. Clean the reel disk shaft and apply grease (SC-141) to it.

2. Align the phase of the reel disk to that of the reel relay gear and to install a new take-up reel disk onto the shaft.

3. Check the reel disk height and reassemble the take-up main brake ass'y.

Note:

1. Take care so that the Tu main brake ass'y is not damaged. Take care so that grease does not adhere the brake surface.

2. After reassembly, check the video search rewind back tension (see page 27), and check the brake torque (see page 29).

• Height checking and adjustment Note:

1. Set the master plane with due care so that it does not contact the drum.

2. When putting the master plane, shift the reverse guide a little in the loading direction. Care must be taken since excessive shift results in damage.

Figure 1-4.

Note:

When the tension band ass'y is pressed in the direction of the arrow for removal, the catch is hard to be deformed.

Figure 1-5.

• Reassembly (Supply reel disk)

1. Clean the reel disk shaft and apply grease (SC-141) to it.

2. Match the phases of reel disk and reel relay gear, and set the new reel disk.

3. After checking the reel disk height, wind the tension band ass'y around the reel disk, and insert into the hole of tension arm ass'y.

Master plane

Reverse guide

Supply reel disk

Cassette lock release shaft

Take-up reel disk

Position pin

Figure 1-6.

Note:

• Check that the reel disk is lower than part A but higher than part B. If the height is not correct, readjust the reel disk height by changing the poly-slider washer under the reel disk.

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Note:

Whenever replacing the reel disk, perform the height checking and adjustment.

Master plane

10 ± 0.2mm

Reel disk

Reel disk height adjusting jig

Mechanism chassis

Figure 1-7.

CHECKING AND ADJUSTMENT OF TAKEUP TORQUE IN FAST FORWARD MODE

• Remove the cassette housing control assembly.

• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord, then turn on the power.

• Setting

1. Set a torque gauge to zero on the scale. Place it on the take-up reel disk.

2. Press the FF button.

3. To calculate the remaining capacity of the play back mode, slowly rotate the supply reel disk, and then shift it into the forward mode.

• Checking

1. Turn the torque gauge slowly (one rotation every 2 to 3 seconds) by hand in the CW direction.

2. Make sure that the indication of torque gauge is not less than 30mN·m (306gf·cm).

Notes:

1. Hold the torque gauge by hand so that it is not moved.

2. Do not keep the reel disk in lock state. Do not allow long-time measurement.

CHECKING AND ADJUSTMENT OF TAKEUP TORQUE IN REWIND MODE

• Remove the cassette housing control assembly.

• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord, then turn on the power.

• Setting

1. Set a torque gauge to zero on the scale. Place it on the supply reel disk.

2. Press the rewind button.

3. To calculate the remaining capacity, slowly rotate the take-up reel disk, and then shift it into the rewind mode.

• Checking

1. Turn the torque gauge slowly (one rotation every 2 to 3 seconds) by hand in the CCW direction.

2. Make sure that the indication of torque gauge is not less than 30mN·m (306gf·cm).

Torque gauge

30mN·m (306gf·cm) or more

CCW

Torque gauge

30mN·m (306gf·cm) or more

Idler ass'y

The gauge is held at its maximum value. (Red mark)

Figure 1-8.

• Adjustment

1. If the FF winding-up torque is less than the specified value, clean the capstan D.D. motor pulley, drive belt, and limiter pulley with cleaning liquid, and check again.

2. If the torque is less that the set value, replace the reel belt.

The gauge is held at its maximum value. (Red mark)

Supply reel disk

Idler ass'y

Figure 1-9.

• Adjustment

1. If the rewind winding-up torque is less than the specified value, clean the capstan D.D. motor pulley, drive belt, and limiter pulley with cleaning liquid, rewind again, and check the winding-up torque.

2. If the winding-up torque is still out of range, replace the drive belt.

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Notes:

1. Hold the torque gauge by hand so that it is not moved.

2. Do not keep the reel disk in lock state. Do not allow long-time measurement.

CHECKING AND ADJUSTMENT OF TAKEUP TORQUE IN RECORD/PLAYBACK MODE

• Remove the cassette housing control assembly.

• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord.

• Turn on the power.

• Open the cassette torque meter lid, and fix it with tape.

• Load the cassette torque meter into the unit.

• Put the weight (500g) on the cassette torque meter.

• Turn on the power switch.

• Press the picture record button, and set EP picture record mode (x3).

Set value EP6.9 ± 2.5mN⋅m (70 ± 25gf⋅cm)

CHECKING AND ADJUSTMENT OF TAKEUP TORQUE IN VIDEO SEARCH REWIND MODE

• Remove the cassette housing control assembly.

• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord, then turn on the power.

• Setting

Press the playback button and rewind button to set the video search rewinding mode.

• Checking

1. Place the torque gauge on the supply reel disk, and turn it counterclockwise very slowly (one rotation every 1 to 2 seconds) and check that the torque is within the set value 14.0 ± 3.9mN⋅m. (144 ± 40gf⋅cm)

Torque gauge

500g

Cassette torque meter

Figure 1-10.

• Checking

1. Make sure that value is within the setting 6.9 ± 2.5mN·m (70 ± 25gf·cm).

2. The winding-up torque fluctuates due to variation of rotation torque of limiter pulley ass'y. Read the center value of fluctuation as setting.

3. Set the EP record mode (x3) and make sure that the winding-up torque is within setting.

• Adjustment

If the playback winding-up torque is not within the setting, replace the limiter pulley assembly.

Note:

When the torque cassette is set, put a weight (500g) to prevent rise.

CCW

Supply reel disk

Figure 1-11.

Note:

Surely put the torque gauge on the reel disk to measure. If the torque gauge is raised, accurate measurement is impossible.

• Adjustment

1. If the rewinding playback winding-up torque is not within the setting, replace the limiter pulley assembly.

Note:

The winding-up torque fluctuates due to variation of rotation torque of supply reel disk. Read the center value of fluctuation as setting.

CHECKING THE VIDEO SEARCH REWIND BACK TENSION

• Remove the cassette housing control assembly.

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• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord, then turn on the power.

• Checking

1. After pressing the play button, press the rewind button, and set the video search rewind mode.

2. Place the torque gauge on the take-up reel disk, and turn it counterclockwise very slowly (one rotation every 2 to 3 seconds) and check that the torque is within the set value 3.4 ± 1.5mN⋅m (35 ± 15gf⋅cm).

Torque gauge

CCW

Take-up reel disk

Pinch roller

Capstan shaft

Tension gauge adapter

Tension gauge 900 - 1,200g

Figure 1-13.

1. Detach the pinch roller from the capstan shaft. Do not separate excessively. Or the pinch lever and pinch double action lever may disengage.

2. Engage the tension gauge adapter with the pinch roller shaft, and pull in the arrow direction.

3. Gradually return the pinch roller, and measure the pulling force when the pinch roller contacts the capstan shaft.

4. Make sure that the measured value is within setting

0.9 to 11.8 N (900 to 1,200g).

CHECKING AND ADJUSTMENT OF TENSION POLE POSITION

• Remove the cassette housing control assembly.

Figure 1-12.

Notes:

Set the torque gauge securely on the take-up reel disk. If it is not secure, the measurement will be incorrect.

CHECKING THE PINCH ROLLER PRESSURE

• Remove the cassette housing control assembly.

• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord, then turn on the power.

• Checking

Press the play button to set the playback mode.

• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord, then turn on the power.

• Setting

1. Open the cassette tape (T-120), and fix with tape.

2. Set the cassette tape in loading state.

3. Put the weight (500g) on the cassette tape.

4. Make the adjustment with the beginning of a T-120 tape.

(T-120)

500g

Weight to prevent float (500g)

Figure 1-14.

• Checking

1. Set a cassette tape, push the REC button to place the unit in the SP record mode. Now check the tension pole position.

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2. Visually check to see if the right edge of the tension pole is within the 1.5 ± 0.25mm from the right edge of the Sup guide shaft.

Sup guide shaft

Tension pole

1.5 ± 0.25mm

-0.1

1.6 mm

-0.6

Make the adjustment with the beginning of a T-120 tape.

Figure 1-15.

At left side from the center line

Tension pole adjuster adjusting range

Tension pole adjuster

90°

Figure 1-18.

Adjust so that the delta mark of tension pole adjuster is within 90° range (left, right).

CHECKING AND ADJUSTMENT OF RECORD/ PLAYBACK BACK TENSION

• Remove the cassette housing control assembly.

1.5 ± 0.25mm

Figure 1-16.

Insert the slotted screwdriver in the tension pole adjuster, and rotate counterclockwise.

At right side from the center line

1.5 ± 0.25mm

Figure 1-17.

• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord, then turn on the power.

• Setting

1. Open the torque cassette meter and fix with tape.

2. Set the cassette tape in loading state.

3. Put the weight (500g) on the cassette torque meter.

500g

Weight to prevent float (500g)

Cassette torque meter

Figure 1-19.

Insert the slotted screwdriver in the tension pole adjuster, and rotate clockwise.

• Checking

1. Push the REC button to place the unit in the SP record mode.

2. At this time ascertain that the back tension is within the setting (36.5 to 52g·cm) by seeing the indication of torque cassette meter.

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• Adjustment

1. If the indication of torque cassette meter is lower than the setting, shift the tension spring engagement to the part A.

2. If the indication of torque cassette meter is higher than the setting, shift the tension spring engagement to the part B.

Tension arm

Tension spring

Figure 1-20.

CHECKING THE BRAKE TORQUE

• Checking the brake torque at the supply side

Torque gauge

CCW

• Checking the brake torque at the take-up side

Torque gauge

Take-up reel disk

CCW: 8.8~23.5mN⋅m (90~240gf⋅cm) CW: 4.9~11.8mN⋅m (50~120gf⋅cm)

CCW

Figure 1-22.

• Remove the cassette housing control assembly.

• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord, then turn on the power.

Supply reel disk

CCW: 3.9~9.8mN⋅m (40~100gf⋅cm) CW: 8.8~23.5mN⋅m (90~240gf ⋅cm)

Figure 1-21.

• Remove the cassette housing control assembly.

• After short-circuiting TP7701 and TP7702 provided at the left on the main PWB, plug in the power cord, then turn on the power.

• Setting

1. Set a torque gauge to zero on the scale. Place it on the supply reel disk.

2. Switch from the FF mode to the STOP mode.

3. Disconnect the power cord.

• Checking

Turn the torque gauge at a rate of about one turn/2 sec in the CW direction/CCW direction with respect to the supply reel disk so that the reel disk and torque gauge pointer rotate at equal speed, and make sure that the value is within the setting (CW direction: 8.8 to

23.5mN·m (90 to 240gf·cm); CCW direction: 3.9 to

9.8mN·m (40 to 100gf·cm).

• Setting

1. Switch from the FF mode to the STOP mode.

2. Disconnect the power cord.

3. Set a torque gauge to zero on the scale. Place it on the take-up reel disk.

• Checking

1. Turn the torque gauge at a rate of about one turn/2 sec in the CCW direction/CW direction so that the reel disk and torque gauge pointer rotates at equal speed and make sure that the value is within the setting (CCW direction: 8.8 to 23.5mN·m (90 to 240gf·cm), CW direction: 4.9 to 11.8mN·m (50 to 120gf·cm).

2. Adjustment of the brake torque at the supply side and the take-up side

• Unless the supply side brake torque or take-up side brake torque is within the setting, clean the felt surface of reel disk (supply, take-up) brake lever, check again the brake torque.

• If value cannot be set within the setting yet, replace the main brake ass'y or main brake spring.

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REPLACEMENT OF A/C (Audio/Control) HEAD

1. Remove the cassette housing control assembly.

2. In unloading state, unplug the power cord.

• Removal

1. Remove the screws 123, Azimuth screw and Tilt screw.

2. Unsolder the PWB fitted to the A/C head

Notes:

1. When replacing, never touch the head. If you touched, clean with the cleaning liquid.

2. When removing the screw 3, take care so that the spring may spring out.

Tilt screw

Azimuth screw

Height screw

Spring

Figure 1-23.

3. Align the left end of gear of A/C head arm with the punched mark of chassis, tentatively tighten the screws 1 and 2 so as to ensure smooth motion of A/C head arm. Tentative tightening torque must be 0.15 to 0.20 N·m (1.5 to 2.0kgf·cm).

Height screw

Left end of A/C head arm gear

Punched line mark on chassis

Figure 1-25.

Note:

1. If the screws 1 and 2 are tighten tentatively too loose, the azimuth and height of A/C head may change when they are finally tightened. Therefore care must be taken.

2. After completion of A/C head be sure to adjust tape running. (Execute the running adjustment by the method described in Page 32, 33.)

• Replacement

1. Solder the removed PWB to the new head assembly.

2. Adjust the height from the A/C head arm (lower surface) to the A/C head plate to 10.8mm with slide calipers. (3 places of azimuth screw section, tilt screw section and A/C head front section) (See the figure below.)

Solder

New A/C head ass'y

A/C head PWB

Never touch the head

A/C head plate

10.8mm10.8mm

Figure 1-24.

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