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CAUTION: READ THIS BEFORE OPERATING
YOUR UNIT.

1.

This unit is a sophisticated stereo cassette deck. To ensure
proper operation for the best possible performance, please
read this manual carefully.

2.

Choose the installation location of your unit carefully. Avoid
placing it in direct sunlight or close to source of heat. Also
avoid locations subject to vibration and excessive dust, heat,
cold or moisture. Keep it away from sources of hum such as
transformers or motors.

3.

Do not open the cabinet as this may result in damage to the
deck or electrical shock. If a foreign object should get into
the deck, contact your local dealer.

4.

When removing the power plug from the wall outlet, always
pull directly on the plug; never pull the cord itself.

5.

Do not apply excessive force when operating switches and
knobs.

6.

When moving the deck, be sure to first pull out the power
plug and remove all cords connecting the deck to other
equipment.

7.

Do not attempt to clean this unit with chemical solvents as
this may damage the finish. Use a clean, dry cloth.

8.

Never allow metallic items (e.g. screwdrivers, tools, etc.) to
come near the record/playback head assembly. Doing so
may not only scratch or damage the head’s mirror-smooth
finish, it may also change the magnetic characteristics of the
heads, causing a deterioration in reproduction quality.

9.

Although the record/playback head used in this unit is a high
quality head with outstanding reproduction characteristics, it
can become dirty through the use of old tapes or from dust
accumulation over time. This can have a serious effect on
reproduction quality. Clean the heads regularly with one of
the commonly available head cleaners or with cleaning
solutions as explained later in this manual.

10.

Be sure to read the “TROUBLESHOOTING” section of this
manual for advice on common operating errors before
concluding that your unit is faulty.

11.

Keep this manual in a safe  place for future reference.

12. Voltage Selector (General model only)

The voltage selector on the rear panel of this unit must
be set for your local mains voltage BEFORE plugging in
the AC mains supply. (Voltage selector adjustable
between 110/120/220/240 V AC.)

Note

Please check the copyright laws in your country to record from
records, compact discs, radio, etc.  Recording of copyright
material may infringe copyright laws.

FOR CANADIAN CUSTOMERS

TO PREVENT ELECTRIC SHOCK, MATCH WIDE
BLADE OF PLUG TO WIDE SLOT AND FULLY
INSERT.

THIS CLASS B DIGITAL APPARATUS MEETS ALL
REQUIREMENTS OF THE CANADIAN
INTERFERENCE-CAUSING EQUIPMENT
REGULATIONS.

We Want You Listening For A Lifetime

YAMAHA and the Electronic Industries Association's
Consumer Electronics Group want you to get the most out of
your equipment by playing it at a safe level. One that lets the
sound come through loud and clear without annoying blaring
or distortion – and, most importantly, without affecting your
sensitive hearing.
Since hearing damage from loud sounds
is often undetectable until it is too late,
YAMAHA and the Electronic Industries
Association's Consumer Electronics
Group recommend you avoid prolonged
exposure to excessive volume levels.

We
Want You

LISTENING

For A Lifetime

FCC INFORMATION (U.S.A.)

1. IMPORTANT NOTICE: DO NOT MODIFY THIS UNIT!

This product, when installed as indicated in the
instructions contained in this manual, meets FCC
requirements.  Modifications not expressly approved by
Yamaha may void your authority, granted by the FCC, to
use the product.

2. IMPORTANT: When connecting this product to

accessories and/or another product use only high quality
shielded cables.  Cables supplied with this product
MUST be used.  Follow all installation instructions.
Failure to follow instructions could void your FCC
authorization to use this product in the USA.

3. NOTE: This product has been tested and found to

comply with the requirements listed in FCC Regulations,
Part 15 for Class "B" digital devices.  Compliance with
these requirements provides a  reasonable level of
assurance that your use of this product in a residential
environment will not result in harmful interference with
other electronic devices.  This equipment generates/uses
radio frequencies and, if not installed and used
according to the instructions found in the users manual,
may cause interference harmful to the operation of other
electronic devices.  Compliance with FCC regulations
does not guarantee that interference will not occur in all
installations.  If this product is found to be the source of
interference, which can be determined by turning the unit
"OFF" and "ON", please try to eliminate the problem by
using one of the following measures:

Relocate either this product or the device that is being
affected by the interference.

Utilize power outlets that are on different branch (circuit
breaker or fuse) circuits or install AC line filter/s.

In the case of radio or TV interference, relocate/reorient
the antenna.  If the antenna lead-in is 300 ohm ribbon
lead, change the lead-in to coaxial type cable.

If these corrective measures do not produce satisfactory
results, please contact your local retailer that is
authorized to distribute this type of product.  If you
cannot locate the appropriate retailer, please contact
Yamaha Electronics Corp., U.S.A.
6660 Orangethorpe Ave, Buena Park, CA 90620

The above statements apply ONLY to those products
distributed by Yamaha Corporation of America or its
subsidiaries.

Summary of Contents for K-903

Page 1: ...éo de la série Natural Sound NATURAL SOUND CASSETTE DECK K 903 DOLBY NR OFF B C REC LEVEL PHONES STANDBY ON MODE O p RELAY PLAYBACK DECK A RECORD PLAYBACK DECK B MIN MAX DIRECTION RESET RESET DIRECTION SEARCH MUTE SEARCH REC PAUSE EJECT EJECT NORMAL HIGH DUBBING A B CLOSE CLOSE PLAY PLAY U C A ...

Page 2: ... similar surfaces that may block the ventilation openings or placed in a built in installation such as a bookcase or cabinet that may impede the flow of air through the ventilation openings 9 Heat The unit should be situated away from heat sources such as radiators stoves or other units that produce heat 10 Power Sources The unit should be connected to a power supply only of the type described in ...

Page 3: ... You Listening For A Lifetime YAMAHA and the Electronic Industries Association s Consumer Electronics Group want you to get the most out of your equipment by playing it at a safe level One that lets the sound come through loud and clear without annoying blaring or distortion and most importantly without affecting your sensitive hearing Since hearing damage from loud sounds is often undetectable un...

Page 4: ...ES High Quality Hard Permalloy Recording Playback Head in Deck B and Playback Head in Deck A Dolby B C Noise Reduction Auto Tape Selector Relay Playback from DECK A to DECK B Selection Search Recording Mute Function Rec Return Operation Easy Dubbing Operation at Selectable Speed Normal High Peak Level Meters with Peak Hold Function Remote Control Capability with Optional Remote Control Transmitter...

Page 5: ...The LINE OUT PLAY jacks on the deck should be connected to the TAPE PB Playback Input jacks on your amplifier receiver and the LINE IN REC jacks on the deck should be connected to the REC OUT Recording Output jacks on your amplifier receiver The LINE OUT terminals on this unit are numbered 3 and the LINE IN jacks are numbered 4 When connecting this unit to a YAMAHA amplifier or receiver whose term...

Page 6: ...button Use the tape counter to aid in locating a point on a tape 0000 to 9999 To fast forward or rewind the tape When the tape running indicator is lit Pressing the button fast forwards the tape while pressing the button rewinds the tape When the tape running indicator is lit Pressing the button fast forwards the tape while pressing the button rewinds the tape Insert the cassette with the exposed ...

Page 7: ...ayed back up to 8 times RELAY Cassette tapes loaded in DECKs A and B are played back sequentially See RELAY PLAYBACK on page 9 Display during playback Tape counter Tape counter Peak level meters Indicate the peaks of the signal levels during recording and playback over a 30 dB to 6 dB range There are separate meters for each left and right channel These level meters have a peak hold function which...

Page 8: ...rch for the selection located before the current selection Operate the following buttons when the beginning of the current selection is being played When the tape running indicator is lit When the tape running indicator is lit Press simultaneously MUTE SEARCH MUTE SEARCH MUTE SEARCH Press simultaneously Press simultaneously MUTE SEARCH Press simultaneously MUTE SEARCH Press simultaneously MUTE SEA...

Page 9: ...d side reverse side When the MODE button is set to DECK A forward side reverse side DECK B forward side reverse side When the tape running direction is set to only the reverse side is played When the MODE button is set to DECK A forward side or reverse side DECK B forward side or reverse side Display 5 Up to 8 times Up to 8 times 5 Up to 8 times RELAY 5 NATURAL SOUND CASSETTE DECK K 903 DOLBY NR O...

Page 10: ...cks shut 4 Select the tape running direction Press the DIRECTION button for DECK B Each time the button is pressed the tape running direction changes between forward and reverse and the indicator lights on the display 5 The REC indicator lights on the display The deck enters the Rec Pause mode REC PAUSE DIRECTION MODE RELAY Refer to the following description Refer to the following description PLAY...

Page 11: ...of the tape When the tape running direction is set to only the reverse side is recorded If you select or RELAY the reverse mode automatically switches to in step 5 Display during recording Peak level meters Indicate the peaks of the signal levels during recording and playback over a 30 dB to 6 dB range There are separate meters for each left and right channel These level meters have a peak hold fu...

Page 12: ...e PLAY button was pressed If you reset the tape counter to 0000 during recording Rec Return automatically rewinds the tape to the 0000 point Rec Return functions according to the most recent operation For example if you reset the tape counter to 0000 and then press the PLAY button later Rec Return rewinds to the point where the PLAY button was pressed The PLAY button cannot be used to mark a retur...

Page 13: ...ops immediately and then DECK B stops after recording a 4 second blank section When the tape in DECK B reaches its end DECK B stops and then DECK A stops When the tape in DECK A reaches its end DECK A stops and DECK B stops after providing a blank section of about 4 seconds Available operations while dubbing The Rec Return function can be carried out on DECK B Refer to REC RETURN OPERATION on the ...

Page 14: ...f cassette tapes available However they all conform to standard specifications so any brand may be used with the deck Classification of Cassette Tapes by Formulation Cassette tapes are available in four basic types depending on their formulation or type of magnetic material and manufacturing process These four types are commonly known as Normal Type I NORM Chrome Type II HIGH CrO2 Ferrichrome Type...

Page 15: ...o sound unsteady tape speed loss of high frequency response etc Thus clean the heads and all surfaces over which the tape travels with a commercially available cleaning cassette and fluid type cleaner DEMAGNETIZATION After 20 30 hours of use enough residual magnetism will build up on the heads to cause poor high frequency reproduction At this time you should use a commercially available cassette t...

Page 16: ...he unit off and disconnect the AC power from the AC outlet After about 30 seconds have passed connect the power and try again Load a cassette tape Change tape or cover protective hole with adhesive tape Clean head Demagnetize head using head demagnetizer Change to a different tape Replace with a fresh tape A warped cassette shell cannot be fixed Replace with another tape and test Check input level...

Page 17: ...ol transmitter cannot be operated Type Auto reverse 4 track 2 channel recording and playback stereo double cassette deck Motors DC servo motor x 2 main Heads Recording playback Hard Permalloy x 1 Erase Double gap Ferrite x 1 Playback Hard Permalloy x 1 Rapid Transport 100 sec C 60 Wow and Flutter WRMS 0 08 W Peak 0 15 Signal to Noise Ratio Dolby NR off 58 dB Dolby B NR on 66 dB Dolby C NR on 74 dB...

Page 18: ... utilisée dans cet appareil soit une tête de haute qualité possédant d excellentes caractéristiques de reproduction elle peut se salir après l utilisation de bandes usagées ou à cause de l accumulation de poussière avec le temps Ceci peut avoir un effet néfaste sur la qualité de reproduction Nettoyer régulièrement les têtes avec un des nettoyeurs de têtes du marché ou avec des solutions de nettoya...

Page 19: ...aintien de crête Télécommande possible grâce à l émetteur de télécommande en option CARACTERISTIQUES 19 CONNEXIONS 20 REMARQUES SUR CE MODE D EMPLOI 20 LECTURE commune aux platines A et B 21 FONCTIONNEMENT DE BASE 21 RECHERCHE DE MORCEAUX 23 LECTURE ENCHAINEE 24 ENREGISTREMENT 25 FONCTIONNEMENT DE BASE 25 FONCTIONNEMENT DE L ENREGISTREMENT SILENCIEUX REC MUTE 27 FONCTIONNEMENT DU RETOUR APRÈS ENRE...

Page 20: ...LINE IN REC de la platine doivent être connectées aux prises de sortie d enregistrement REC OUT enregistrement sortie de votre amplificateur ampli syntoniseur Les prises LINE OUT de cet appareil portent le numéro 3 et les prises LINE IN le numéro 4 Lors du raccordement de cet appareil à un amplificateur ou un récepteur Yamaha dont les prises sont numérotées 1 2 3 4 relier les prises LINE OUT de ce...

Page 21: ...re le compteur à zéro 0000 Appuyez sur la touche RESET Utilisez le compteur pour localiser aisément un point sur la bande 0000 à 9999 Pour avancer rapidement ou réembobiner la bande Quand l indicateur de défilement de bande est allumé Une pression sur la touche avance rapidement la bande et une pression sur la touche la réembobine Quand l indicateur de défilement de bande est allumé Une pression s...

Page 22: ...is RELAY Les cassettes mises en place dans les platines A et B sont lues l une après l autre Reportez vous à la page 24 LECTURE ENCHAINEE Affichage pendant la lecture Compteur de bande Compteur de bande Compteurs de niveau de crête Indiquent les crêtes des niveaux de signal pendant l enregistrement et la lecture au dessus d une gamme 30 dB à 6 dB Ce sont des compteurs séparés pour chaque canal de ...

Page 23: ... RECHERCHE DE MORCEAUX Pour lire un morceau voulu en recherchant le début du morceau Quand l indicateur de défilement de bande est allumé Pour rechercher le morceau suivant Quand l indicateur de défilement de bande est allumé Quand l indicateur de défilement de bande est allumé Pour rechercher le morceau en cours Quand l indicateur de défilement de bande est allumé Pour rechercher le morceau situé...

Page 24: ...ne B face avant face inversée Quand la touche MODE est réglée sur Platine A face avant face inversée Platine B face avant face inversée Quand la direction de défilement de la bande et réglée sur seule la face inversée est lue Quand la touche MODE est réglée sur Platine A face avant ou face inversée Platine B face avant ou face inversée Affichage 5 Jusqu à 8 fois RELAY NATURAL SOUND CASSETTE DECK K...

Page 25: ...urce de programme à enregistrer et ajuster le niveau d enregistrement REC PAUSE DIRECTION L indicateur REC s allume à l affichage La platine entre en mode de pause d enregistrement Se référer à la description suivante Se référer à la description suivante 6 7 3 L enregistrement commence Choisir le sens de défilement de la bande Appuyez sur la touche DIRECTION correspondant à la platine B Chaque pre...

Page 26: ... faces de la bande sont enregistrées Après l enregistrement la platine s arrête à la fin de la bande Quand la direction de défilement de la bande est réglée sur seule la face arrière est enregistrée Si vous choisissez ou RELAY le mode d inversion est automatiquement adopté au cours de l étape 5 Compteur de bande électronique Utiliser le compteur de bande électronique pour faciliter la localisation...

Page 27: ...a touche PLAY est pressée pendant l enregistrement la fonction de retour après enregistrement rebobine automatiquement la bande au point où la touche PLAY a été pressée Si pendant l enregistrement on remet le compteur à zéro 0000 la fonction de retour à zéro rebobine automatiquement la bande de manière que le compteur indique 0000 La fonction de retour à zéro tient compte de la dernière opération ...

Page 28: ...iginal a été l objet d une réduction de bruit Dolby la copie l est également Pour arrêter la copie Appuyer sur la touche Si on appuie sur la touche de la platine B les deux platines cessent de fonctionner et la copie est abandonnée Si on appuie sur la touche de la platine A la platine cesse immédiatement de fonctionner et la platine B après l enregistrement d un silence de 4 secondes Lorsque la fi...

Page 29: ...onibles sur le marché cependant elles sont toutes conformes à des caractéristiques standard ce qui fait que n importe quelle marque peut être utilisée avec la platine Classification des cassettes par leur formule Les cassettes du marché se divisent en quatre types de base selon leur formule ou le type de matériel magnétique utilisé et le processus de fabrication Ces quatre types sont connus sous l...

Page 30: ... 20 30 heures d utilisation une certaine quantité de magnétisme résiduel se sera formé sur les têtes et provoquera une médiocre reproduction des hautes fréquences Il est alors nécessaire de démagnétiser les têtes avec un démagnétiseur du commerce Lors du nettoyage du parcours suivi par la bande et lors de la démagnétisation des têtes veillez à respecter les instructions fournies avec les produits ...

Page 31: ...ement Vérifier et fixer les raccordements Nettoyer la tête Démagnétiser la tête avec un démagnétiseur de tête Changer pour une meilleure bande Vérifier les connexions des entrées et sorties et réinsérer correctement Eloigner d appareils électriques TV lampe fluorescente couverture électrique etc Nettoyer le cabestan et le galet presser ou changer pour une meilleure bande Réembobiner la bande Insér...

Page 32: ... pondéré 0 08 Crête pondéré 0 15 Rapport signal bruit Dolby NR à l arrêt 58 dB Dolby B NR en marche 66 dB Dolby C NR en marche 74 dB Réponse en fréquence 20dB Type I normale 20 16 000 Hz 3 dB Type II élevée CrO2 20 17 000 Hz 3 dB Type IV métal 20 19 000 Hz 3 dB Distorsion harmonique Moins de 1 0 Sensibilité d entrée impédance Ligne 100 mV 43 k ohms Niveau de sortie Ligne 570 mV 1 4 k ohms Casque 0...

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