Yamaha K903 Manual

							11
ENGLISH FRAN‚AIS DEUTSCH SVENSKA ITALIANO ESPA„OL DUTCH
Û
30 dB Ð
AÜ
R L20 15 10 8 6   4 2 0 2 4 6+ 
Û
BÜ
RECRELAYB C
DOLBY NR selector setting (in step 2)
Set the DOLBY NR selector according to your purpose.
OFF: No noise reduction.
 B: For recording the sources with Dolby B NR.
 C: For recording the sources with Dolby C NR.
ÖDolby noise reduction is an extremely effective method of
reducing undesirable background hiss on tapes.  This unit
incorporates both Dolby B NR and the newer Dolby C NR
system.  Dolby C NR is approximately twice as effective
as the earlier Dolby B NR.
REVERSE MODE selector setting (in step 3)
The auto reverse function allows the tape running direction
to be reversed automatically.  Select the auto reverse mode
(
) or manual reverse mode ().
:When recording on one side of a tape is finished, the
deck stops at the end of the tape.
:Both sides of a tape are recorded.  After recording,
the deck stops at the end of the tape.
ÖWhen the tape running direction is set to ª, only
the reverse side is recorded.
ÖIf 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 Ð30 dB to +6 dB range.  There are separate meters
for each left and right channel.  These level meters have a peak hold function which holds the peak level for about 1.5 seconds. Tape counter
Use the tape counter to aid in locating a point on a tape (0000 to 9999).
To set the counter reading to Ò0000Ó, press the RESET button. The A or B indicator shown in
the display represents the
last deck operated.
Setting the recording level (in step 6)
Play the loudest passage of the source to be recorded and
watch the meter readings.
Adjust the REC LEVEL control so that the highest peak
reaches +4 of the optimum recording level.
To stop recording:
Press the & button.To stop recording temporarily:
Press the REC/PAUSE button.  To resume recording, press
the PLAY button.
REC indicator DOLBY  B/ C indicator MODE indicator
Tape running direction indicator 
						

							12
REC MUTE OPERATION - Inserting a blank space during recording
REC RETURN OPERATION - To return to the point at which the recording started
A 4-second blank interval is automatically recorded on the
tape and then the deck enters Rec/Pause mode.
If a blank interval longer than 4 seconds is desired, keep
pressing for as long as you want.  When the MUTE/
SEARCH button is released, the deck enters Rec/Pause
mode after making a 4-second blank interval.
To resume recording, press the PLAY button.
ÖIf a blank interval shorter than 4 seconds is desired, press
the PLAY button at the desired point during Rec mute
mode.  Recording will be resumed from that point. During recording:
During Rec mute operation, the REC indicator blinks.
During recording:
When the # indicator
is lit:
!
Ú
When the @ indicator
is lit:ÖIf you press the PLAY button during recording, Rec Return
automatically rewinds the tape to the point where the
PLAY button was pressed.*
If you reset the tape counter to Ò0000Ó during recording,
Rec Return automatically rewinds the tape to the Ò0000Ó
point.
Rec Return functions according to the most recent
operation. For example, if you reset the tape counter to
Ò0000Ó 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 return point
while dubbing.
MUTE/SEARCH
Synchronized recording function
When operating this unit in combination with the
YAMAHA CD Player which has SYNCHRO button on its
remote control transmitter, CD Synchronized recording
function can be utilized. This function is operated with
the remote control transmitter of the CD Player.
(Regarding the operation, refer to the manual of the CD
Player.)
NATURAL SOUND  CASSETTE DECK  K-903
DOLBY NROFF/      B/      CREC LEVELPHONES
STANDBY/ON
MODEO / p / ¸ / RELAY
PLAYBACKDECK AStabilizerRECORD/PLAYBACKDECK B
MIN MAX
Cassette StabilizerCassette
DIRECTION RESETRESET DIRECTION
!Ú
&SEARCH
!Ú
&MUTE/SEARCHREC/PAUSE
EJECTEJECTNORMAL HIGHDUBBING  A # B
!ÚMUTE/SEARCH
CLOSE %% CLOSE
PLAY PLAY 
						

							13
ENGLISH FRAN‚AIS DEUTSCH SVENSKA ITALIANO ESPA„OL DUTCH
DUBBING (From DECK A to DECK B)
12Set the MODE selector to 
or  position.
If you select 
 or
RELAY, the reverse
mode automatically switches to
.Set the
DIRECTION
buttons for DECKs
A and B.
3Set the dubbing speed to either NORMAL
(normal speed) or HIGH (twice the normal
speed) with the DUBBING buttons*.
Dubbing starts automatically.
DUBBING A # BNORMAL HIGHThe corresponding NORM
or HIGH indicator lights on
the display.
* Higher quality sound will be obtained with the
NORMAL setting.
Note
During dubbing, Dolby NR is automatically set to off and the
recorded tape can be dubbed as is. (When the tape to be
dubbed is recorded with Dolby NR, this effect is also
dubbed.) To stop dubbing
Press the & button.  (If you press the & button on DECK B,
both decks stop simultaneously and the dubbing mode is
cancelled.  If you press the & button on DECK A, DECK A
stops 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 ÒREC RETURN OPERATIONÓ on the previous
page. You can make dubbing from DECK A to DECK B.  Open the cassette compartments by pressing the EJECT buttons and load a
blank cassette tape in DECK B and the original cassette tape in DECK A.
Display during dubbing
MODEÒ/[/Ó/RELAYDIRECTION
NORM or HIGH
indicator lights during
dubbing.Lights during dubbing.
NATURAL SOUND  CASSETTE DECK  K-903
DOLBY NROFF/      B/      CREC LEVELPHONES
STANDBY/ON
MODEO / p / ¸ / RELAY
PLAYBACKDECK AStabilizerRECORD/PLAYBACKDECK B
MIN MAX
Cassette StabilizerCassette
DIRECTION RESETRESET DIRECTION
!Ú
&SEARCH
!Ú
&MUTE/SEARCHREC/PAUSE
EJECTEJECTNORMAL HIGHDUBBING  A # B
3 2
1
Û
30 dB –
ANORMÜ
R L20 15 10 8 6   4 2 0 2 4 6+ 
ÛBÜRELAYDUB HIGH RECB C
CLOSE %% CLOSE
PLAY PLAY 
						

							14
PROTECTING YOUR RECORDINGS
All cassette tapes are provided with erasure protection holes
to prevent accidental erasure of recorded contents.  There is
a small tab covering the hole on each side of the cassette,
and it should be broken off after recording the tape. Without
this tab covering the hole, it is impossible to record onto that
tape.  Thus, you can safely protect a recording for as long as
you wish without fear of accidental erasure. Should you wish
to use a cassette tape protected in this way for recording,
simply covering the hole with adhesive tape will permit
erasure and re-recording.
ÖWhen using Chrome (Type II/HIGH ) or Metal
(Type IV/METAL) tapes, make sure you do not cover the
hole intended for the Auto Tape Selector operation.
TAKING UP SLACK IN THE TAPE
As a precaution against tape entanglement and damage,
remove any slack in the tape before inserting cassettes into
the deck. This is accomplished by inserting a pencil, pen or
similar object into one of the spools and gently winding it
until all the slack is removed.  You do not have to wind it too
tightly.
Be careful not to touch the tape part itself. It is very delicate
and touching it may damage the tape and its recorded
contents.
STORING CASSETTES
After putting a cassette tape back into its case, store it in a
location away from exposure to direct sunlight, humidity,
high temperatures, and magnetic fields (away from television
sets, speakers, etc.).  High temperatures and humidity will
damage the tape itself, while exposure to magnetic fields
may cause a loss of recorded material. Avoid touching the
tape surface with your fingers, since dirt or finger oil will
contaminate the deckÕs heads.
CASSETTE TAPES
CASSETTE TAPES
There are many different types of cassette tapes available.
However, they all conform to standard specifications so any
brand may be used with the deck.
ÖClassification 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
), Ferrichrome (Type III/FeCr), and Metal (Type IV/
METAL), and they each require specific tape deck
adjustments for optimum performance.
* YAMAHA does not recommend the use of 120 minute
length cassettes since the extreme thinness of the tape
makes them susceptible to mechanical and recording
problems.
AUTO TAPE SELECTOR DETECTION SLOTS
The deck has a built-in Auto Tape Selector which
automatically adjusts for the proper bias, level and
equalization according to the tape formulation Ñ all you
have to do is to load a cassette and the Auto Tape Selector
does the rest.
The Auto Tape Selector determines which type of tape is
loaded by sensing detector slots in the top of the tape shell.
Each tape formulation has its own characteristic hole
markings standardized by the tape industry.
ÖEarly model Metal (Type IV/Metal) tape formulation
cassette shells do not have the slots for Auto Tape
Selector operation. As a result, early model Metal type
tapes recorded on another deck will be played back with
the deck at the Chrome (Type II/HIGH ) settings.
YAMAHA does not recommend using this kind of tape.
ÖThe deck does not have the required setting for
Ferrichrome (Type III/FeCr) tape, since this tape
formulation is not widely used. Should you use a
Ferrichrome tape, it will be recorded and played back at
the Normal (Type I/NORM) settings, which will result in an
unnatural high frequency emphasis. This effect may be
compensated for somewhat by adjusting the tone controls
of your amplifier/receiver during playback.
Detector slots Detector slots
TYPE II TYPE IV 
						

							15
ENGLISH FRAN‚AIS DEUTSCH SVENSKA ITALIANO ESPA„OL DUTCH
With the optional remote control transmitter RKX1, you can
operate this unit at your listening position. For details, refer
to the instruction manual supplied with the remote control
transmitter.REMOTE CONTROL OPERATION RANGE
MAINTENANCE
CLEANING OF THE TAPE PATH
Continued high quality performance of your deck is
dependent upon periodic cleaning of the heads, capstan,
pinch roller, and all surfaces over which the tape travels.
Normal use will cause an accumulation of dirt and dust on
the heads, capstans, and pinch rollers.  This can lead to
poor sound quality, drop outs (intervals with no 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 tape-type head demagnetizer.
ÖWhen cleaning the tape path or demagnetizing the heads,
be sure to follow carefully the instructions of the
concerning materials such as cleaning fluid or head
demagnetizer.
Capstan Capstan
Pinch roller Pinch rollerHeads
OPTIONAL REMOTE CONTROL TRANSMITTER
DECK B
SINGLE DECKINTRO SCAN
DOUBLE DECKDUBBING
DECK A/B DIR A DIR B
COUNTER
RESET
PLAY SEARCH
REC/PAUSE REC MUTESTOP
RKX1
s
ÛÜ
!
!Ú
Ú
30°
30°
7 m (23 feet)
Remote sensor 
						

							16
If your cassette deck fails to operate normally, check the following table.  It lists common operating errors and simple measures
which you can take to correct the problem.  If it cannot be corrected, or the symptom is not listed, disconnect the deckÕs power
cord and contact your authorized YAMAHA dealer or authorized service center for help.
Cause
ÖPower plug is not properly plugged in.
ÖCassette shell is warped or damaged.
ÖThere is an influence of strong external
noise (lightning, excessive static
electricity, etc.) or a misoperation was
performed while using this unit.
ÖNo cassette tape loaded.
ÖProtective tabs are broken off.
ÖHead is dirty.
ÖHead is magnetized.
ÖTape is damaged or of poor quality.
ÖTape is bad (stretched, deformed, etc.).
ÖCassette shell is warped.
ÖRecording level is too high.
ÖFaulty connection between deck and
stereo amplifier/receiver.
ÖHead is dirty.
ÖHead is magnetized.
ÖWorn out or poor quality tape.
ÖConnection(s) improperly made.
ÖAffected by external electrical noise.
ÖDirty capstan, pinch roller, etc., or poor
tape.
ÖTape is wound unevenly.
ÖSlack tape, or tape spillage wound
around capstan.
ÖREC LEVEL control is set to too low.
ÖProtective tabs are broken off.
ÖBlank section is too short.
ÖRecorded section has low-level portions.
ÖConversation, etc. has been recorded.
ÖDolby NR-recorded tape is played back
in OFF position.
Cure
ÖReinsert plug properly.
ÖDo not play damaged tapes.
ÖTurn the unit off and disconnect the AC
power from the AC outlet. After about
30 seconds have passed, connect the
power and try again.
ÖLoad a cassette tape.
ÖChange tape or cover protective hole
with adhesive tape.
ÖClean head.
ÖDemagnetize head using head
demagnetizer.
ÖChange to a different tape.
ÖReplace with a fresh tape.
ÖA warped cassette shell cannot be
fixed. Replace with another tape and
test.
ÖCheck input level with signal level meter
and use lower rec level when recording.
ÖCheck and secure connections.
ÖClean head.
ÖDemagnetize head with head
demagnetizer.
ÖChange to better tape.
ÖCheck input and output connections
and reinsert properly.
ÖMove deck away from electrical
appliances (TV, fluorescent light,
electric blanket, etc.).
ÖClean capstan and pinch roller, or
change to better tape.
ÖRewind tape.
ÖInsert pencil in hole in cassette shell
and turn to take up slack.
ÖAdjust REC LEVEL control.
ÖChange tape or cover protective hole
with adhesive tape.
ÖBlank sections must be at least 4
seconds long.
ÖNo remedy
ÖNo remedy
ÖPlay back in appropriate Dolby NR
position.
Fault
Tape doesnÕt move in recording or
playback.
If it happens that this unit does not
work normally.
REC/PAUSE button fails to function.
Sounds become faint and sometimes
inaudible.
Recorded sound is distorted.
Tape is playing back, but no sound is
heard.
Excessive noise.
Excessive wow (wavering of the
sound).
Tape stops in the middle of recording
or playback.
Fails to record.
Search does not operate correctly.
High frequencies in the playback
sound are emphasized and unpleasant
to listen to, and noise level (hiss) is
also high.
TROUBLESHOOTING 
						

							17
ENGLISH FRAN‚AIS DEUTSCH SVENSKA ITALIANO ESPA„OL DUTCH
Cause
ÖNormally-recorded tape is played back in
Dolby NR.
ÖHeads are dirty.
ÖHeads are magnetized.
ÖBasic levels are different for different
cassette decks.
ÖThe batteries are exhausted.
ÖThe remote control transmitter is
operated from an incorrect distance or
angle.
ÖThe remote control sensor is lighted
strongly.
Cure
ÖPlay back in OFF position.
ÖClean heads and carry out
demagnetization with head
demagnetizer.
ÖThis is not a fault.
ÖReplace batteries.
ÖOperate it from less than 7 meters
(about 23 ft.) and 30¡.
ÖPlace the unit away from the strong
light.
Fault
Playback sound is muffled and high
frequencies are inaudible.
When playing back tapes recorded on
other decks, meter deflections are
greater (smaller) than when recorded.
The remote control 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
Frequency Response (Ð20 dB)
Type I/Normal.............................. 20 ~ 16,000 Hz ±3 dB
Type II/High (CrO
2)....................  20 ~ 17,000 Hz ±3 dB
Type IV/Metal.............................. 20 ~ 19,000 Hz ±3 dB
Harmonic Distortion..................................... less than 1.0%
Input Sensitivity/Impedance
Line...................................................... 100 mV/43 k-ohms
Output Level
Line..................................................... 570 mV/1.4 k-ohms
Phones..................................................... 0.25 mV/8 ohms
Channel Separation (1 kHz)...................... more than 40 dB
Crosstalk (125 Hz)..................................... more than 55 dB
SPECIFICATIONS
GENERAL
Power Supply.................................................. 120 V, 60 Hz
Power Consumption............................ 11 W/7 W (Standby)
Dimensions (W x H x D)...................... 435 x 146 x 279 mm
(17-1/8 x 5-3/4 x 11)
Weight........................................................... 5.0 kg (11 lbs.)
Accessory
Audio cord................................................................ 1 pair
* Specifications subject to change without notice. 
						

							32

Le son de lecture est ŽtouffŽ et les
hautes frŽquences sont inaudibles.
Lors de la lecture de bandes
enregistrŽes sur dÕautres platines, les
dŽflexions du compteur sont plus
grandes (plus petites) quÕˆ
lÕenregistrement.
La tŽlŽcommande ne fonctionne pas.

ÖLire en position OFF.
Ö
dŽmagnŽtisation avec un

ÖCeci nÕest pas un dŽfaut.
ÖRemplacer la pile.
ÖLa faire fonctionner ˆ moins de 7

Ö
fortes.
Cause
ÖUne bande enregistrŽe normalement est
lue avec Dolby NR.
Ö
Ö
ÖLes niveaux de base sont diffŽrents pour
diverses platines.
ÖLa pile est dŽchargŽe.
ÖLa tŽlŽcommande est actionnŽe dÕune
distance ou sous un angle incorrects.
ÖLe dŽtecteur de la tŽlŽcommande est
fortement ŽclairŽ.
Configuration des pistes............. Platine ˆ cassette double
stŽrŽo avec inversion automatique pour lÕenregistrement et
la lecture, 4 pistes, 2 canaux
Moteur.............. Moteur asservi CC x 2 (moteurs principaux)
................... Enregistrement/Lecture: Permalloy dur x 1
Effacement: Ferrite ˆ double entrefer x 1
Lecture: Permalloy dur x 1
Transport rapide................................. 100 secondes (C-60)
Pleurage et scintillement
Eff., pondŽrŽ...........................................................  0,08%
.....................................................  ±0,15%
Rapport signal/bruit
............................................... 58 dB
(Dolby B NR en marche)...................................... 66 dB
(Dolby C NR en marche)...................................... 74 dB
RŽponse en frŽquence (Ð20dB)
Type I/normale............................ 20 ~ 16.000 Hz ±3 dB
Type II/ŽlevŽe (CrO
2).................. 20 ~ 17.000 Hz ±3 dB
Type IV/mŽtal.............................. 20 ~ 19.000 Hz ±3 dB
Distorsion harmonique................................ Moins de 1,0%
SensibilitŽ dÕentrŽe/impŽdance
Ligne.................................................... 100 mV/43 k-ohms
Niveau de sortie
Ligne................................................... 570 mV/1,4 k-ohms
Casque..................................................... 0,25 mV/8 ohms
SŽparation des canaux (1 kHz)............... infŽrieure ˆ 40 dB
Diaphonie (125 Hz)................................... infŽrieure ˆ 55 dB
GENERALES
Alimentation.................................................... 120 V, 60 Hz
Consommation......................................... 11 W/7 W (Veille)
Dimensions (L x H x P)....................... 435 x 146 x 279 mm
Poids........................................................................... 5,0 kg
C‰bles audio......................................................... 1  paire
* Les caractŽristiques techniques sont sujettes ˆ des
changements sans prŽavis.
CARACTERISTIQUES TECHNIQUES
YAMAHA ELECTRONICS CORPORATION, USA   6660 ORANGETHORPE AVE., BUENA PARK, CALIF. 90620, U.S.A.
YAMAHA CANADA MUSIC LTD.   135 MILNER AVE., SCARBOROUGH, ONTARIO M1S 3R1, CANADA
YAMAHA ELECTRONIK EUROPA G.m.b.H.    SIEMENSSTR, 22-34, 25462 RELLINGEN, BEI HAMBURG, F.R. OF GERMANY
YAMAHA ELECTRONIQUE FRANCE S.A.   RUE AMBROISE CROIZAT BP70 CROISSY-BEAUBOURG 77312 MARNE-LA-VALLEE CEDEX02, FRANCE
YAMAHA ELECTRONICS (UK) LTD.    YAMAHA HOUSE, 200 RICKMANSWORTH ROAD WATFORD, HERTS WD1 7JS, ENGLAND
YAMAHA SCANDINAVIA A.B.   J A WETTERGRENS GATA 1, BOX 30053, 400 43 VASTRA FR…LUNDA, SWEDEN
YAMAHA MUSIC AUSTRALIA PTY, LTD.    17-33 MARKET ST., SOUTH MELBOURNE, 3205 VIC., AUSTRALIA
Printed in MalaysiaVZ 79070-1