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Teac A-1250 User manual

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TEAc.
INSTRUCTIO]| MANUAL
STEREO TAPE DECK
Your new TEAC A-l250Tape Deck has been manufactured under the strictest
quality control procedures, each unit has been thorouglrly checked at the factory.
Should any damage have been incurred during transit or should you have any dou' ts
as to its performance, contact your dealer.as soon as possible.
Our investigation has shown that approximately 40% of the calls for service
immediately after purchase, result from improper operation of the equipment.
Therefore it is important that you thoroughly read and understand this manual
before placing the unit in operation. A lack of, or improper cleaning can also result in
a degradation of performance. Careful observation of the cleaning and servicing hints
contained in this manual will contribute to a lengthened trouble free unit life. Please
consult the trouble shooting chart on page 16 before seeking service as most common
problems are thoroughly covered by this chart.
Service
Should the equipment need repair, contact the dealer where it was purchased, or
the authorized TEAC Service Center nearest you.
1)The Wananty period is described in the enclosed warranty card, read the card for
complete details.
2) For repairs after expiration of the warranty period a service charge will be made in
addition to the price of repair parts.
3) If only repair parts are required, place your order with your dealer, nearest TEAC
authorized Service Center.
Note
Although the unit may still be under
charged for repairs made necassary by
result of improper operation.
the Warranty period, you may be
misuse, or damage incurred as a
Contents
i''ar panel connections
General recording information' . . . : . . . . . . .
Connections to and from the A-1250
Function of the operating controls
Threading the tape
Basic tape deck operation
Playback of 4 track stereo tape
Playback of 4 track mono tape
Splicing the tape
1
I
2
J
4
5
5
6
7
7
8
10
Expert use of REC. BIAS and
General information and precaPAUSE
utions at recording
Recording in 4 track stereo
Recordingin4trackmono ......1l
Recordingsound-on-sound... ....12
Correctingthereelturntableheight. ......12
Erasing .....13
Demagnetizing.... ........13
Cleaning --......14
Oiling. .....14
Changing the power line setting . . . . 15
Specifications ...... 15
Troubleshootingchart ...16
Environmental conditions
Environmental conditions
Although this recorder may be used in either the upright or horizontal positions, the
upright position is preferred from the point of more efficient ventilation. Mounting
locations to be avoided are;
Locations of constant high ternperature
Do not operate this unit near heating appliances or on top of an amplifier where
amplifier heat would contribute to a rise in temperature. Do not place the unit where
it will be exposed to direct summer sunlight. Temperature extremes will not only
cause degradation of sound quality but will also shorten the usefuil operating life of
the unit. Avoid temperatures higher than 100oF.
Locations of extreme low temperature
In low temperature locations lubricants will harden and satisfactory operation
cannot be expected. Operation will be sluggish and an overload may be placed on the
drive motors. Avoid temperatures lower than 40"F.
Locations of high humidity
High humidity locations will shorten equipment life due to corrosion and possible
fungus grorvth on printed circuit boards.
Dusty environments
Your TEAC recorder is a precision machine and as such should be protected from
dust. Operation in a dusty atmosphere will result in excessive head and bearing wear.
Your tapes should also be kept dust free.
Fluctuation of the supply voltage
Should you be in an area where line voltage fluctuation is severe, the use of an
automatic voltage controller is recommended.
Rear Panel Connections
General Recording lnformation
O FUSE 2,A
(E AC POWER IN
€) OUTPUT
@rN /our (DIN)
@ LINE IN
DIN/rec ording/playback c onnector
An optional cord with DIN connectors may be used for
interconnecting the deck and stereo amplif ier system with a
single connecting cord.
Note: When using the DIN cord, recording levels are set
the MIC control and MIC/LINE mixing cannot
performed.
If use of the DIN cord results in insufficient volume level or
inferior tone quality, remove the cord and use the four
cables furnished with the equiprnent.
Sound recordings are made in a strip on the magnetic
surface of a recording tape. This magnetized strip is called
the "Track". The full tape width divided by two is called a
"2" ttack recording, and the full tape width divided into
quarters is called a"4" trackrecording.
"2" Track recording
2 Track recording is mainly employed in Radio Stations
and professional recording studios for stereo recording, in
this case both tracks are recorded simultaneously and in the
same direction. 2 track recording in the home is usually
done one track at a time and is played back monaurally.
"4" Track recording (Monaural)
In this mode, each of the four tracks is recorded
individually. At the end of the tape the reels are inter-
changed between left and right and the next track is
recorded. The order in rvhich the tracks are recorded is ii l,
*4, *3 and lastly f 2. (Note) With tape threaded on the
machine the tracks are numbered 1 through 4, from the top
to the bottom, viewed from the base side of the tape.
Four track recording gives maximum playback time,
however, the benefits of stereo reproduction are lost.
" 4" T r ack recording ( Stereophonic)
In this mode two tracks are recorded simultaneously, on
the first pass of the tape, tracks f I and f 3 are recorded.
The left and right reels are then interchanged and tracks # 2
and # 4 are recorded. The left channel sound will be on
tracks # I and # 4 and the right channel sound will be on
tracks # 2 and # 3. Four track recording in stereo will
provide the best possible stereophonic repioduction and ii
the most widely used recording method today.
Playback compat ibility
A four track stereo tape deck can play back both 4 track
and 2 track tapes and from the point of compatibility has
the widest possible range of utilization. When playing a 2
track stereo tape on a 4 track recorder, track # 1 will be
completely covered by the head, track # 2 however will be
slightly off alignment but stereo can still be enjoyed by
compensating for the slight loss of # 2 track volume with
the volume or balance controls. On the other hand a four
track tape cannot be played back on a two track (Monaural)
recorder as both tracks # I and # 2 will be reproduced
together resulting in mixed unintelligible sound.
by
be
2 f rack recording ( Monaural )
lst
4 frack recording ( Stereophonic)
2nd
iecord head
Record Head
Record Head
4 Track recording ( Stereophonic)
( Monaural )
4Track recording
1-
Rear Panel Gonnections
O FUSE 2A
(D AC POWER IN
o OUTPUT
@rN TOUT (DIN)
@ LINE IN
DIN/recording/playback connector
An optional cord with DIN connectors may be used for
interconnecting the deck and stereo amplilier system with a
single connecting cord.
Note: When using the DIN cord, recording leve1s are set
the MIC control and MIC/LINE mixing cannot
performed.
If use of the DIN cord results in insufficient volume level or
inlerior tone quality, remove rhe cord and use the four
cables furnished with the equiprrent.
Sound recordings are made in a strip on the magnetic
surface of a recording tape. This magnetized strip is called
the "Track". The lull tape width divided by two is called a
"2" track recording, and the full tape width divided into
quarters is called a "4" track recording.
"2" Tfack recording
2 Track recording is mainly employed in Radio Stations
and professional recording studios for stereo recording, in
this case both tracks are recorded simultaneously and in the
same direction. 2 track recording in the home is usually
done one track at a time and is played back monaurally.
"4" Track recording (Monaural)
In this mode, each of the four tracks is recorded
individually. At the end of the tape the reels are inter-
changed between left and right and the next track is
recorded. The order in rvhich the tracks are recorded is i* 1,
+ 4, # 3 and lastly # 2. (Note) With tape threaded on the
machine the tracks are numbered 1 through 4, from the top
to the bottom, viewed from the base side of the tape.
Four track recording gives maximum playback time,
however, the benefits of stereo reproduction are lost.
"4" Track recording (Stereophonic)
In this mode two tracks are recorded simultaneously, on
the first pass of the tape, tracks # I and S 3 are recorded.
The left and right reels are then interchanged and tracks # 2
and F 4 are recorded. The left channel sound will be on
tracks f I and # 4 and the right channel sound will be on
tracks f 2 and * 3. Four track recording in stereo wil,l
provide the best possible stereophonic reproduction and is
the most widely used recording method today.
Playback compatibility
A four track stereo tape deck can play back both 4 track
and 2 track tapes and from the point of compatibility has
the widest possible range of utilization. When playing a 2
track stereo tape on a 4 track recorder, track # 1 will be
completely covered by the head, track # 2 however will be
slightly off alignment but stereo can still be enjoyed by
compensating for the slight loss of f 2 track volume with
the volume or balance controls. On the other hand a four
track tape cannot be played back on a two track (Monaural)
recorder as both tracks # I and # 2 will be reproduced
together resulting in mixed unintelligible sound.
by
be
General Recording lnformation
4 Track recording ( Stereophonic)
2nd
1st lecord head
2 T rack recording ( Monaural )
Record Head
4 frack recording ( Stereophonic)
4Track recording ( Monaural )
-1--
Gonnections to and f rom the A-1 25O
Front of A-l 250
Microphone (right channel)
Microphone (lelt channel)
2
Stereo hcadphone/8 ohms
Function of the Operating Gontrols
Index counter
This is for indexing the program material position on
the tape. It can be reset to zero by pressing the zero
reset button on its right.
Reel turntable
7" reel is the maximum that can be used.
Tension arm - sensing post
This functions not only to take up the slack in the tape
when starting and stopping but acts to maintain a
constant tension on the tape although the winding
diameter will change as tape travels from reel to reel.
The tension arm also contains the sensing contacts to
provide the automatic reverse function.
Guide post
This hard stainless steel guide post, working in combina-
tion with the tension arm, acts as a mechanic-al filter to
absorb vibrations due to irregular unwinding of tape
caused by sticking to the supply reel, or unstable travel
of tape by uneven windings on the reel.
Tape speed knob
Selects tape speed at recording or playback
H:TLAips
L:33/+ ips
10 Microphone jacks (MIC IN)
L: Left. R: Right channel.
Input impedance, 10K o.
6 Head housing
*7 Microphone level control (MIC)
Line input level control (LINE)
Output level (playback or source) control (OUTPUT)
Controls the tape playback output level (volume).
The above level controls with asterisks are dual-con-
centric knobs. The white knob is for the left channel
(left sound) and the black knob for the right channel
(right sound). When either knob is turned, the other
will rotate with it. If only one channel should be
adjusted, the other knob is to be held immovable.
Headphone jack (PHONE)
An 8 o (low impedance type) is recommended.
Monitor select switch (MONITOR)
SOURCE:This position allows monitoring of the
sound, before being recorded, by the meter,
and by the headphone or speaker.
TAPE: This position is used for playback or moni-
toring of the tape which is being recorded.
Recording mode switches (RECORD MODE)
These are for putting the deck in the recording mode,
to either stereo or monaural.
LEFT: Up position allows recording of the left
channel program (of the 1 st and 2nd record-
ing for mono).
ll
l2
{€g
*9
L:*
A
3h
l3
RIGHT: Up position allows recording of the right
channel program (or the 3rd and 4th record-
ing for mono).
14 Level meter lamp
These will be illuminated when the power is turned
on.
Level meter (left, right)
For monitoring the recording and playback level.
Capstan
Transports tape at a constant speed unaffected by
changing diameter on reel.
Pinch roller
Hoids tape against capstan at a constant pressure to
prevent wow, speed variation and tape from shifting up
or down during travel.
18 Shut-off arm
This arm automatically shuts off the tape transport
mechanism when tape is completely rewound or if the
tape breaks during transport (switch will operate to
turn off power when this arm comes to rest at its
horizontal position).
19. Tape transport buttons
With the Tape Mode Level, below these buttons, at
PLAY and the Eldepressed, the tape will .be trans-
ported from left to right, depressing theEtbutton will
cause the tape to be played back from right to left.
With the Tape Mode Lever at FAST, depressing either
the El or the El button will cause the tape to be
wound at FAST speed in the selected direction.
STOP Button, stops the tape in any mode of operation,
(disengages the record mode).
PAUSE: Temporarily stops the tape in the recording
mode without disengaging the recording mode.
During playback (Left to right only) you are able to
convert to the recording mode at any time by simulta-
neously pressing the EIand the record button.
This feature is most usefull for editing or for eliminat-
ing unwanted material.
NOTE: If theEleft button should be depressed while
in the recording mode, the recording mode will
be automatically disengaged to prevent acci-
dental erasure of your recording.
22
Power switch (POWER)
Level meter lamp will light to indicate power is ON
when this button is depressed. To turn OFF power,
depress again and release.
Recording button ( RECORD)
Record indicating lamp (REC)
REC. BIAS
HIGH: This position is lor recording of high
performance tapes (Scotch 203, etc.)
which requires a larger bias than regular
tapes (Scotch I 50, etc.).
NORMAL: This position is for recording of regular
g tapes (Scotch 150. etc.).
21
15
l6
23
t7
-'GA
Integrated amplifier
Speaker system
(lelt channel) Speaker system
(right channel)
44,