Akai GX-280D-SS User manual

COCesoD-ss
OPERATOR’S MANUAL
4-HEAD 3-MOTOR AUTOMATIC REVERSE
SURROUND STEREO ТАРЕ DECK
WARNING:
To
prevent
fire
or
shock
hazard,
do
not
expose
this
appliance
to
rain
or
moisture.
MANUFACTURED & DISTRIBUTED BY AKAI ELECTRIC CO., LTD./AKAI TRADING CO., LTD./AKAI AMERICA LTD.

GX (GLASS & CRYSTAL FERRITE) HEAD
Akai has equipped this model with its new and amazing
Glass & Crystal Ferrite Recording and Playback Heads to
bring you unequalled open reel high fidelity sound. With
the Glass & Crystal Ferrite Head, superbly wider frequen-
cies with clear highs can be recorded in all their true fidelity
with low noise tape. In other words, with the GX Head, a
high dynamic range and excellent signal-to-noise ratio are
achieved. The secret of this success lies in the head
materials, superior processing technique and the focused-
field recording system. The core of this quality head is
made of single crystal ferrite and is mounted and set in
glass. The superior high range characteristics are contri-
butable to the structure of the head gap which focuses the
magnetic field into a sharp oblong radius. This focused field
recording system minimizes high frequency loss, eliminating
undue equalization and achieving a wider dynamic range.
4-CHANNEL SURROUND STEREO
What is all the talk about 4-channel stereo and what are the
advantages? 4-channel stereo is equally as great an achieve-
ment as the advancement from monaural to 2-channel
stereo. Just as 2-channel stereo sound reproduction meant
the exodus of flat monaural sound, this epoch-making new
system eliminates the inability to pick up and reproduce
pure concert hall sound. New 4-channel stereo uses 4 signal
paths or sound tracks in the program material and in
playback approximates the complexity of the sound waves
which reach the listener's ear when attending a live concert
hall performance.
For playback, 4 speakers are positioned to surround the
listener. The sound from the front and rear speakers give
the listener an exciting “sense of presence". With the 4
speakers each delivering separate sound, you are literally
surrounded with a wall of sound. This 4-dimensional sound
reproduction makes conventional stereo seem empty and
insufficient.
AKAI’s "SURROUND STEREO" supplements conven-
tional stereo's 2 front speakers with two additional rear
speakers to form the “2-2 system". The listener is sur-
rounded by two sets of speakers (left & right front and left
& right rear). This arrangement does not mean, however,
that simply adding two speakers to a 2-channel system is all
that is necessary for 4-channel playback. At recording time,
4 microphones are used and sound is picked up from 4
separate places. Four separate recordings are made using 4
separate channels (four tracks in one direction). This
4-channel stereo tape feeds into 4 pre-amplifiers and 4 main
amplifiers to activate a 4-speaker system. Thus, at playback
time, sounds from separate channels are emitted from each
speaker providing the listener with a feeling that he is
listening to concert hall sound from the best seat in the
auditorium.
Model GX-280D-SS Stereo Tape Deck is a compatible
4-channel/2-channel model. For 2-channel operation, only
the front channels are utilized.
For exciting 4-channel surround stereo playback, a 4-
channel external power amplifier or two 2-channel ampli-
fiers can be used to activate a 4-speaker system.
CEE, CSA, UL, and LA Standard models are not
equipped with a Voltage S tor or Cycle Conversion
Switch. Therefore, voltage and cycle conversion is
not necessary. If your machine corresponds to any of
these standards, please disregard all references to
voltage and cycle adjustment throughout this manual.
CEE Models : 220V, 50Hz
CSA Models 120V, 60Hz
UL & LA Models: 120V, 60Hz
INDEX
(Glas hn Zoi EEE аа
4-Track Recording/Playback System ...............
4-Channel Surround Stereo Recording/Playback .. . .
2-Channel Stereo Recording/Playback ............
Tape Loading, socs а ee ee Gases w sh oes
Tape Selector Switch ...... eee
Tape Speed Selection socrus ee
Direct Function Change Control System .
Fast Forward & Rewind ........... ays
Automatic Stop & Shut-Off . css cee coe or ees
How To Use The Pause Button ,..................
How To Use The Index Counter ..................
Remote Control о uu a zoe IM eaten dy NUR |
Operating Instructions ...........
Connections For Playback . . 52.2 ose sawa ame
Connections For Recording ...... S aa
4-Channel Surround Stereo Playback .............
2-Channel Stereo Playback
Automatic & Manual Reverse Playback .............
4-Channel Stereo Recording
2-Channel Stereo Recording 10
Sound-On-Sound Recording aem 1D
Sound Mixing .......... x 12
N о со чо tn Un tn tn + + + RR + + + + tO
10
Tape Erasing ......... 12
Tape Splicing & Editing . 8 13
Maintenance ................................. 13
Heads Should Always Be Kept Clean...........-- 13
Pinch Wheel & Capstan Cleaning ................ 13
Head Demagnetizing. . 2... оноо ван Cuna t'a eee w
Voltage & Cycle Conversion
Technical Dalasa o xg onset. жал SNO
Standard Accessories .. .
Trouble Shooting Chart а dives es tunia ans

CONTROLS
12.
13.
14.
20.
21.
22:
23.
24.
25.
26.
27.
28.
29.
INDEX COUNTER & RESET BUTTON
With Reset Button, set Index Counter to '*0000" before
beginning operation.
SUPPLY REEL TABLE
REEL RETAINER
Built-in Reel Retainer locks reel firmly into place.
HEAD COVER
Houses Full Track Erase, Half Track Erase, and GX Recording
and Playback Heads.
TAPE TENSION LEVER
TAPE GUIDE/SENSING PIN
. PAUSE BUTTON
Convenient for temporarily suspending tape movement during
operation. Lock into pause position by turning to right.
. AUTOMATIC SHUT-OFF BUTTON
Linked to Automatic Shut-Off Lever. Refer to page 4.
POWER SWITCH
SPEED SELECTOR SWITCHES
(7-1/2 and 3-3/4 ips)
MONITOR SWITCH
To monitor program source, depress to SOURCE (in) position,
To monitor recorded signals or for playback, set to TAPE (out)
position.
STEREO SELECTOR
For 2-channel operation, depress to “2-СН” position. For
4-channel operation, set to “4-CH” position,
VU METER (Left front channel)
Indicates left Front Channel recording/playback level.
VU METER (Right front channel)
Indicates right Front Channel recording/playback level.
MICROPHONE RECORDING LEVEL CONTROL (Left front
channel)
Adjust left Front Channel microphone input level while
observing left Front VU Meter.
FRONT CHANNEL MICROPHONE JACKS
For front channel microphone recording.
. LINE RECORDING LEVEL CONTROL (Left front channel)
Adjust left Front Channel line input level while observing left
Front VU Meter.
AE ROPHOBB RECORDING LEVEL CONTROL (Right front
channel)
Adjust right Front Channel microphone input level while
observing right Front VU Meter.
LINE RECORDING LEVEL CONTROL (Right front channel)
Adjust right Front Channel line input level while observing right
Front VU Meter.
TAPE SELECTOR SWITCH
Depress when using AKAI Super Range Tape or other make low
noise tapes.
CAPSTAN
TAKE-UP REEL TABLE
REEL RETAINER
PINCH WHEEL
Presses against Capstan to transport tape.
TAPE GUIDE/SENSING PIN
AUTOMATIC SHUT-OFF LEVER
For automatic stop-shut-off, refer to page 4 .
RECORD SAFETY BUTTON
While holding this button at depressed position, depress FWD
Button to effect recording mode.
REWIND BUTTON
For rewinding tape at fast speed.
REVERSE BUTTON
For effecting manual reverse playback.
30.
3. =
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
STOP BUTTON
Depress to stop tape travel.
FORWARD BUTTON
Advances tape for recording or playback.
FAST FORWARD BUTTON
Advances tape at high speed.
VU METER (Left rear channel)
Indicates left Rear Channel recording/playbzck level.
VU METER (Right rear channel)
Indicates right Rear Channel recording/playback level.
LINE RECORDING LEVEL CONTROL (Right rear channel)
Adjust right Rear Channel line input level while observing right
Rear VU Meter.
MICROPHONE RECORDING LEVEL CONTROL (Right rear
channel)
Adjust right Rear Channel microphone input level while
observing right Rear VU Meter.
REAR CHANNEL MICROPHONE JACKS
For Rear Channel microphone recording.
LINE RECORDING LEVEL CONTROL (Left rear channel)
Adjust left Rear Channel line input level while observing left
Rear VU Meter.
MICROPHONE RECORDING LEVEL CONTROL (Left rear
channel)
Adjust left Rear Channel microphone input level while observ-
ingleft Rear VU Meter.
HEADPHONE JACKS (Front and Rear channel)
REMOTE CONTROL SOCKET
For connection of AKAI Remote Control unit RC-16 (optional
accessory ).
UNIVERSAL VOLTAGE SELECTOR & FUSE POST
For adjusting voltage input, refer to page 11.
DIN JACK INPUT SELECTOR SWITCH
When using Din Jack connection, if output level of external
amplifier is high, set to High position, and if low, set to Low
position.
DIN JACK (Rear channel)
Enables inter-connection with an external amplifier by use of a
single DIN connection cord.
REAR CHANNEL LINE OUTPUT JACKS
Connects to Tape Inputs of external amplifier.
REAR CHANNEL LINE INPUT JACK
Connects to outputs of external source.
CYCLE CONVERSION SWITCH
Set to 50 or 60 Hz to correspond with area power source.
A.C. CORD
FRONT CHANNEL LINE INPUT JACKS
Connects to outputs of external source.
FRONT CHANNEL LINE OUTPUT JACKS
Connects to tape inputs of external amplifier.
DIN JACK (Front channel)
Enables inter-connection with external amplifier by use of a
single DIN connection cord.
SOUND-ON-SOUND SWITCH

4-track 4-channel stereo
1 —— Front CH left
1 — Rear CH left
3 — Front CH right
4 + № Rear CH right
4-track 2-channel stereo
1 pe Left CH
2 [ «— Right CH
SideA © mne | Right CH
-4— sides — 4 HEEP
TAPE SELECTOR SWITCH
Depress Tape Selector Switch when using Akai S.R.T.
(super range tape) or other make low noise tape. This
feature brings out the maximum response of low noise tape
and works to change the recording equalization according
to the tape. Although the GX-280D-SS exhibits a good
frequency response with regular tape, this is further
extended with low noise tape.
TAPE SPEED SELECTION
This model operates on two tape speeds; i.e., 7-1/2 and
3-3/4 ips. Simply depress 7-1/2 or 3-3/4 Tape Speed
Selector Switch according to desired speed. Recording time
using an 1800 ft. tape : (2-channel stereo) 3 hrs. at 3-
3/4ips and 1-1/2 hrs. at 7-1/2ips. (4-channel stereo)
1-1/2 hrs. at 3-3/4 ips. and 3/4 hrs. at 7-1/2 ips.
4-TRACK RECORDING/PLAYBACK SYSTEM
The GX-280D-SS employs a 4-track system which can be
used for either 4-channel or 2-channel stereo recording and
playback. Select system with the Stereo Selector on front
panel.
4-CHANNEL STEREO RECORDING/PLAYBACK
4-channel stereo recording and playback requires the simul-
taneous use of all 4-tracks in one direction. Set Stereo
Selector to 4-CH position and use front and rear channel
controls.
2-CHANNEL STEREO RECORDING/PLAYBACK
2-channel stereo recording and playback requires the
simultaneous use of two tracks. Set Stereo Selector to 2-CH
position and use only front channel controls. The first
stereo recording (playback) takes place on tracks 1 and 3
and the second on tracks 2 and 4 after the reels have been
inverted.
TAPE LOADING
1. Place a full reel of tape on the Supply Reel Table and
an empty reel on the Take-Up Reel Table.
2. Lock reel into place pulling tip of retainer on reel shaft
outward and turning to left or right.
3. Unwind about a 75 cm length of tape from the supply
reel and then thread tape properly as shown by the
dotted lines in the figure.
4. Insert end of tape in slot of empty reel and wind tape
around the reel hub two or three times.
5. Continue winding tape onto take-up reel until all tape
slack has been taken up.
DIRECT FUNCTION CHANGE CONTROL SYSTEM
A completely automatic function change control system is
employed in this model for easy and speedy change of
operating modes. The necessity of depressing the Stop
Button before changing modes is eliminated.
FAST FORWARD & REWIND
To effect fast forward or rewind, depress Fast Forward or
Rewind Button on control panel. Use Stop Button to stop
fast forward or rewind operation.
AUTOMATIC STOP & SHUT-OFF
When the tape comes to the end or is accidentally broken,
the Automatic Shut-Off Lever is released and reel move-
ment is stopped. If the Automatic Shut-Off Button is
depressed, when the Shut-Off Lever is released, the power
of the entire unit is cut off.
OPERATING INSTRUCTIONS
*
Your machine requires constant voltage for optimum
performance. The GX-280DSS is equipped with a
Universal Voltage Selector and Cycle Conversion
Switch. Voltage and Cycles are preset at the factory
according to destination, However, you are requested
to confirm setting before attempting operation and
if necessary, readjust as indicated on page 14 of this
manual, If your local power source is unknown, please
ask your nearest electric company for correct voltage
and cycles,
As dirty heads and magnetized heads become the
source of loss of sound, distortion, sound drop-out,
and other recording and playback failures, the heads
must be kept clean and demagnetized at al! times.
Do not place anything on top of your machine which
will obstruct the ventilator.
Place machine on a flat horizontal surface and operate
HOW TO USE THE PAUSE BUTTON
For momentarily suspending tape travel during recording or
playback, depress Pause Button. Pause control is especially
useful for editing tapes. Simply depress when certain
portions of the program are not desired. After being de-
pressed, the Pause Button can be locked into position by
turning in direction of arrow.
* Pause control is also useful for starting recording smoothly and
quickly. Depress Pause Button and set recorder to recording
mode. Depress SOURCE Monitor Switch and adjust and balance
recording input level while observing VU Meters. When an
optimum level has been determined, simply release Pause Button
and begin recording.
* Pause control does not function during fast forward or rewind
mode.
HOW TO USE THE INDEX COUNTER
Model GX-280D-SS is equipped with a handy 4-digit Index
Counter for easy indexing. This provides an easy reference
for quickly locating positions on the tape. For resetting,
simply depress Reset Button.
REMOTE CONTROL
All operating functions of the GX-280D-SS can be remote
controlled with Akai Remote Control unit RC-16 (optional
accessory). Plug into socket provided on rear panel.
either horizontally or vertically.
* If the sound sources are so far away from the
microphones that the recording level controls must be
turned up to maximum, some hum or noise will
inevitably be recorded. A test recording is recom-
mended before attempting a final recording.
Use good quality tapes. New tape gives best results.
As tapes which have not been used fora period of time
may have become sticky, run once before using.
* Always store tapes in a cool, dry place.
Should there be a problem with your machine, write down
the model and serial numbers and all pertinent data
regarding warranty coverage as well as a clear description of
the existing trouble and contact your nearest authorized
Akai
Service
Station
or
the
Service
Department
of
Akai
Electric Company, Tokyo, Japan.

CONNECTIONS FOR PLAYBACK
CONNECTIONS FOR RECORDING
The Din Jacks at the rear of the recorder are
used for inter-connecting the GX-280D-SS
with an external amplifier.
This system enables easy recording or play-
back through an external amplifier as the
complex connection or disconnection of
several separate plugs is not necessary. e
TUNER AMPLIFIER
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AKAI ELECTRIC CO.,LTD.
MADE IN JAPAN
AKA! ELECTRIC CO.,LTD
MADE IN JAPAN
| AMPLIFIER
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RIGHT LEFT
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REC DIN PR
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REAR J
The connections at left are for 4-chan-
nel surround stereo playback. When
these connections are made and
2-channel stereo playback is desired,
depress front panel Stereo Selector to
2-CH position.
^
If
exclusive
2-channel
playback
is
2-channel
stereo
magnetic
4-channel
stereo
tape
deck
2-channel
stereo
crystal
or
É
cartridge
turntable.
If
a
or
recorder.
ceramic
cartridge
turn-
desired,
use
front
channel
connections
4-channel
stereo
magnetic
When
connections:
for
table.
only.
cartridge
turntable
with
4-channel
stereo
recording
2-channel
stereo
crystal
or
built-in
4-channel
playback
is made
and
2-channel
ceramic
cartridge
turntable.
unit
is
used,
connect
to
the
stereo
recording
is
desired,
Connect to
front
channel
respective
front
and rear
depress
Stereo
Selector
to
input jacks of
the
GX-
channel
input
jacks
of
the
2-CH
position.
For
ex-
280D-SS.
GX-280D-SS.
clusive 2-channel
stereo
recording, use front chan-
nel connections only.

4-CHANNEL SURROUND STEREO PLAYBACK
Connect a 4-channel stereo amplifier/speaker system to the front
and rear channel Output Jacks as shown in CONNECTIONS FOR
PLAYBACK. If a 4-channel stereo amplifier is not available,
connect a 2-channel stereo amplifier each to the front and rear
channel jacks respectively.
* Please read OPERATING INSTRUCTIONS carefully prior to
operation,
Load a pre-recorded tape following the instructions on page 4.
*
Connect power cord and turn on Power Switch (A).
Set Stereo Selector (B) to 4-CH position.
Select tape speed with Tape Speed Selector Switch (C).
Set Monitor Switch (D) to TAPE positon.
Depress Forward Button (E) to begin playback.
Adjust external amplifier controls.
To stop tape travel during playback, depress Stop
Button (F).
nmonbBRenc
2-CHANNEL STEREO PLAYBACK
* Connect a 2-channel s
eo amplifier/speaker system to the front
channel Output Jack: shown in CONNECTIONS FOR PLAY-
BACK. In case a 4-channel stereo amplifier is used, utilize only
the front channel connections.
* Please read OPERATING INSTRUCTIONS carefully prior to
operation,
Load a pre-recorded tape following the instructions on page 4.
*
1. Connect power cord and turn on Power Switch (A).
2. SetStereo Selector (B) to 2-CH position.
3. Select tape speed with Tape Speed Selector Switch (C).
4. Set Monitor Switch (D) to TAPE position.
5. Depress Forward Button (E) to begin playback.
6. Adjust external amplifier controls.
7. 'To stop tape travel during playback depress Stop
Button (F).
8. Depress Reverse Button (G) for playback of reverse
side or invert reels.
Sensing Pin
AUTOMATIC & MANUAL REVERSE PLAYBACK
For automatic reverse playback, affix about a 2.5 cm (1")
long piece of sensing foil to the outside of the tape at
desired reversing point. If continuous reverse between two
points is desired, affix another piece of sensing tape to the
inside of the tape at desired reversing point. As the foil
passes the sensing pole(s) reverse is effected. Model
GX-280D-SS is also equipped with a Manual Reverse
Button for manual reverse playback. To effect manual
reverse, depress Manual Reverse Button on control panel.
4-CHANNEL AUTOMATIC REWIND/SHUT-OFF
Apply a piece of sensing foil to the outside of the tape at
desired reversing point and depress Shut-Off Button. When
the tape reaches the place at which sensing foil is affixed, it
will automatically rewind. After the tape has been re-
wound, the shut-off mechanism will be activated to cut off
the power of the unit.
4-CHANNEL AUTOMATIC REWIND/
CONTINUOUS PLAYBACK
Apply sensing foil to the outside of the tape for normal
playback to rewind and inside for rewind to repeat at
desired repeating point, and confirm that Shut-Off Button
is at OUT position. When the tape reaches the place at
which sensing foil is affixed, it will automatically rewind to
starting position (point at which sensing tape is applied)
and playback will continue. The tape will be played and
rewound over and over until the unit is manually turned
off.
2-CHANNEL AUTOMATIC REVERSE
PLAYBACK/SHUT-OFF
Apply a piece of sensing foil to the outside of the tape at
desired reversing point and depress Shut-Off Button. When
the tape reaches the place at which sensing foil is affixed,
reverse playback is effected. At the end of reverse playback,
the shut-off mechanism will be activated to cut off the
power of the unit.
2-CHANNEL AUTOMATIC CONTINUOUS PLAYBACK
Apply sensing foil to the outside of the tape for normal to
reverse playback and inside for reverse to normal playback
at desired reversing points, and confirm that the Shut-Off
Button is at OUT position. When the tape reaches the place
at which the sensing foil is affixed, reverse playback will be
effected. At the end of reverse playback (point at which
sensing foil is applied) palyback will continue in the
opposite direction, thus providing continuous playback in
both directions.

4-CHANNEL STEREO RECORDING
* Connect desired 4-channel program source to the appropriate
inputs of the GX-280D-SS as shown in CONNECTIONS FOR
RECORDING.
* Please read OPERATING INSTRUCTIONS carefully prior to
operation.
Load tape following instructions on page 4.
*
1. Connect power cord and turn on Power Switch (A).
2. Set Stereo Selector (B) to 4-CH position.
3. Select tape speed with Tape Speed Selector Switch (C).
4. With Reset Button (D), set Index Counter to “0000”.
This Index Counter furnishes a quick reference for
locating positions on the tape.
5. Set Monitor Switch (E) to SOURCE position.
6. Adjust and balance Recording Level Controls (front
and rear channel left and right) (F) while observing
corresponding VU Meters. Normal recording level
should not exceed “0” VU.
7. When an optimum level has been determined, while
holding Record Safety Button (G) at depressed
position, depress Forward Button to begin recording.
8. To stop tape travel during recording, depress Stop
Button (H).
2-CHANNEL STEREO RECORDING
* Connect desired 2-channel program source to the appropriate
inputs of the GX-280D-SS as shown in CONNECTIONS FOR
RECORDING.
* Please read OPERATING INSTRUCTIONS carefully prior to
operation.
* Load tape following instructions on page 4.
Connect power cord and turn on Power Switch (A).
Set Stereo Selector (B) to 2-CH position.
Select tape speed with Tape Speed Selector Switch (C).
With Reset Button (D), set Index Counter to “0000”.
This Index Counter furnishes a quick reference for
locating positions on the tape.
5. Set Monitor Switch (E) to SOURCE position.
6. Adjust and balance Recording Level Controls (front
channel left and right) (F) while observing correspond-
ing VU Meters. Normal recording level should not
exceed “0” VU.
7. When an optimum level has been determined, while
holding Record Safety Button (G) at depressed
position, depress Forward Button to begin recording.
8. To stop tape travel during recording, depress Stop
Button (H).
9. Invert reels for recording on reverse side.
=
NOTES FOR YOUR CONVENIENCE
*
When using Line Input Jacks for connection with the
external source, the input level is adjusted with the
Line Recording Level Controls.
When using Din Jacks for connection with an external
amplifier, or the Microphone Jacks the input level is
adjusted with the Microphone Recording Level Con-
trols.
Microphones must not be placed on top of or too close
to the recorder. Preferably, the microphones should be
placed on a separate table to prevent vibrations of the
recorder motor from reaching them. For best results,
a distance of at least 2 meters should be maintained
between microphones.
The use of the Monitor Switch during recording
enables correct adjustment of the sound source input
level as well as comparison of the sound source and the
recording. For monitoring sound source depress
Monitor Switch to IN position, and for monitoring
recording depress to OUT position.
To momentarily suspend reel movement during record-
ing, use the Pause Button.
For monitoring sound, use stereo headphones of 8 2
impedance. Connect headphone plug to the Headphone
Jacks on front panel.
The Din Jacks are used for inter-connecting the
GX-280D-SS with an external amplifier. This system
enables easy recording or playback through an external
amplifier as the complex connection or disconnection
of several separate plugs is not necessary. The
GX-280D-SS is also equipped with a Din Jack Input
Selector Switch. When recording from an external
amplifier, if the output level of the amplifier is high,
set Selector Switch to HIGH position, and if low, set to
LOW position.
For easy check of input level when using Din/Din
connection cord, after connection has been made, turn
input level to maximum. If VU indicator movement is
limited, set switch to LOW position. If indicator moves
excessively, set Selector Switch to HIGH. In case the
indicator shows no movement at either position, use
opposite ends of the Din cord.
11

SOUND-ON-SOUND RECORDING
The Sound-on-sound feature is utilized for transfer of
previously recorded material from one channel to another
for language training, fun or professional use.
First Recording
1. Confirm that there are no connections to the Input
Jacks.
2. Set Stereo Selector to 4-CH position.
3. Plug in microphone to rear channel left Microphone
Jack.
4. Depress Monitor Switch to SOURCE position.
5. Adjust rear channel left Microphone Recording Level
Control while observing corresponding VU Meter.
6. Depress Reset Button and set Index Counter to
“0000”.
7. While holding Record Safety Button at depressed
position, depress Forward Button to begin first record-
ing; i.e., A-B-C.
8. When the first recording is completed, rewind tape to
starting point.
Second Recording
9. Confirm that the Monitor Switch is at SOURCE
position and set Sound-On-Sound Switch at rear of
unit to ON positon.
10. Set Stereo Selector to 2-CH position.
11. Plug in microphone to front channel right Microphone
Jack.
12. Increase front channel right Line Recording Level
Control to approximately maximum.
13. Connect stereo headphones to front channel Stereo
Headphone Jack for monitoring the first recording.
14. Adjust front channel right Microphone Recording
Level Control while observing corresponding VU
Meter.
15. While holding Record Safety Button at depressed
position, depress Forward Button to begin second
recording; ie. A’-B’-C’. As the second recording
A'-B'-C' is being made, the first recording A-B-C is
monitored through headphones. The two recordings
will be completely merged on front channel tracks. ...
A-A'-B-B'-C-C'.
16. For playback, rewind tape to starting point, depress
Monitor Switch to TAPE position and set both
recorder and external amplifier to front channel
playback mode.
12
SOUND MIXING
Model GX-280D-SS is equipped with independent Line and
Microphone Jacks and input level controls for mixing
signals from two separate sources simultaneously. Record
your own voice accompanied by your favorite combo,
orchestra, etc.
1. Connect power cord and turn on Power Switch.
2. Set Stereo Selector to 2-CH or 4-CH position as
desired.
3. Select tape speed with Tape Speed Selector Switch.
4. With Reset Button, set Index Counter to “0000”. This
Index Counter furnishes a quick reference for locating
positions on the tape.
5. Plug in microphone(s) to Microphone Jack(s) and
connect line output of external source to Line Input of
the GX-280D-SS.
6. Set Monitor Switch to SOURCE position.
7. Adjust and balance microphone input level with
Microphone Recording Level Control and line input
level with Line Input Level Control while observing
corresponding VU Meters. Normal recording level
should not exceed “0” VU.
8. When an optimum level has been determined, while
holding Record Safety Button at depressed position,
depress Forward Button to begin recording.
9. To stop tape travel during recording, depress Stop
Button. See AUTOMATIC STOP & SHUT-OFF.
10. If recording is made in 2-channel, invert reels for
recording on reverse side.
* Mixing can also be accomplished by using the Din Jack and Line
Input connections simultaneously.
* For playback, operate the Stereo Selector according to channels
used in making recording.
TAPE ERASING
Any signals previously recorded on the tape will auto-
matically be erased as a new recording takes place. For
erasing only, load a tape and set recorder to recording
mode. Model GX-280D-SS is equipped with separate
2-channel and 4-channel erase heads. For full track erase,
set Stereo Selector to 4-CH position and for 2-channel
erase, set to 2-CH position. No plugs should be connected
to the input jacks and input volume should be kept at
minimum.
TAPE SPLICING & EDITING
Cut tape diagonally with an overlap so that the ends are
lined up. Cover aligned ends with splicing tape. Press firmly
exerting pressure to secure ends evenly. Trim off excees
splicing tape cutting into recording tape very slightly to
eliminate the posibility of a sticky splice. Tape splicing
using scissors requires skillful work. Akai Tape Splicer
Model AS-3 is recommended for smooth and easy tape
splicing.
TENANCE
HEADS SHOULD ALWAYS BE
KEPT CLEAN
For quality performance, it is imperative that the head
block be kept clean at all times. Dust and magnetic particles
tend to deposit on the heads after prolonged use of the
unit, deteriorating sound quality and sensitivity. The GX
Heads do not normally require cleaning. However, if old
tapes or tapes which have been spliced are used, head
cleaning is recommended. Clean by rubbing the entire head
surface (do not scratch) with a cotton swab stick soaked in
Akai cleaning fluid (from HC-500 Head Cleaning Kit) or
alcohol.
PINCH WHEEL & CAPSTAN
CLEANING
If magnetic particles from the magnetic tape, oil, or other
foreign matter is allowed to accumulate on the Pinch Wheel
and Capstan, irregularity in tape transport may occur
deteriorating sound quality. It is, therefore, recommended
that these parts be wiped clean occasionally. For cleaning,
use Akai Cleaning Kit HC-500, or if Akai cleaning fluid is
not available, use alcohol.
* Do not use chemicals such as chlorothane, etc., as the rubber
wheel will deteriorate.
HEAD DEMAGNETIZING
Normally, the steel pole pieces which form part of the
recording and playback heads become slightly magnetized.
The effect of magnetization is that it causes considerable
drop-out or introduces noise into your recordings. It is,
therefore, recommended that head demagnetizing be per-
formed periodically. This can be accomplished with a bulk
head demagnetizer by bringing it close to the heads and
making several circular motions over all head surface
areas as well as the head housing.
* Be sure to cut off the power of the unit prior to demagnetizing
the heads.
* Do not use magnetized tools in the vicinity of the heads.
* Do not bring the prongs of the demagnetizer close to the VU
Meters.
(13

^6 N
А P. "i i ЖИ
Selector Plug
Fuse Post
<=
TECHNICAL DATA
Track System ....... 4-track 4/2-channel compatible
stereo
VOLTAGE & CYCLE CONVERSION
CEE, CSA, and UL Standard models are not equipped with
a Voltage Selector or Cycle Conversion Switch. Therefore,
voltage and cycle conversion is not necessary. If your
machine corresponds to any of these standards, please
disregard all references to voltage and cycle adjustment
throughout this manual.
VOLTAGE Equalization
Your machine is equipped with a universal voltage selector
offering six selections of voltage from 100 V to 240 V A.C.,
for worldwide operation. Voltage is preset at the factory o Ф Frequnecy Response . (Using low noise tape)
according to destination. However, the operator is re- 20 Hz to 25,000 Hz (+3 dB)
quested to confirm setting and if readjustment is necessary, à at 7-1/2 ips
proceed as follows : (1) Disconnect power cord and remove 30 Hz to 20,000 Hz (+3 dB)
the Fuse Post by screwing in direction of arrow. (2) at 3-3/4 ips
Remove the Voltage Selector Plug and reinsert so that (Using regular tape)
proper area voltage shows through plug cut-out. (3) Change 30 Hz to 23,000 Hz (+3 dB)
Maximum Reel
Capacity: гае 7" reel
Tape Speed. . . 7-1/2 and 3-3/4 ips (+0.5%)
Wow & Flutter Less than 0.10% RMS at 7-1/2 ips
Less than 0.15% RMS at 3-3/4 ips
Voss tee Correct equalization for
playback of tapes recorded
to the NAB curve.
fuse according to voltage (please refer to supplied fuse tag at 7-1/2 ips
instructions). 30 Hz to 19,000 Hz (+3 dB)
* To maintain optimum performance and prolong the life of your at 3-3/4 ips
machine, it is important that the line voltage be held within a i š “б?”
10%
deviation
of
standard
area
voltage.
“t
ia
LO
Ost
1:000:Hz
#0
уп)
ignal-To-Noise
Ratio ... . 55 dB
CYCLE . i Erase Кайо... . Better than 70 dB
Correct tape speed cannot be obtained if the Cycle Bias Frequency 110 kHz
Conversion Switch located on the rear panel of the Heads... Е (4) СХ recording and playback
GX-280D-SS is not properly positioned. Disconnect power
cord and set to 50 Hz or 60 Hz according to area power
source,
heads, full-track erase,
2-channel erase heads.
Motors ............ (3) One servo-motor for direct
capstan drive and two 6-pole
STANDARD ACCESSORIES
" outer-rotor motors for supply
Connection Сога! vous. «мл e seti fe а кайлы a 1 set o @ and take-up reel drive.
Demonstration Tape o popes aus tre rtm mr eS XS 1
Empty Metallic Reel «22:22 Tow А EO hee 1
Sensimp Шарен. е аа mapu dyes oso oe eeu etico 1
Spare Fuse .....
Operator's Manual .
* Spare fuses are not included with CEE, CSA, UL, and LA Stand-
ard models.
Fast Forward &
Rewind Time ..... Within 90 seconds using a
1,200 ft. tape.
Recording Capacity .. 2-channel stereo : 2 hrs.
(1,200 ft. tape, 3-3/4 ips)
4-channel stereo : 1 hr.
(1,200 ft. tape, 3-3/4 ips)
Output Jacks ....... Line (4): 1.23 V (*0" VU)/
100 22; Required load
impedance : more than
25k
Phone (2) : 40 mV/8 Q
InputJacks....... es Microphone (4) : 0.5 mV/10kQ
Line (4) : 0.1 V/150 kQ
Din Jacks: 2... (2) : 0.4 V/60 mV (High)
10 mV (Low)
Semi-Conductors .... 68 silicon transistors,
У 52 diodes
Integrated Circuits ... 4
Power Supply ....... 100 V to 240 V A.C., 50/60 Hz
CEE models: 220 V, 50 Hz
CSA models: 120 V,60 Hz
UL & LA models: 120 V,60 Hz
Power Consumption .. 140W
Dimensions......... 435(W) x 505(H) x 250(D) mm,
(17.4 x 20.2 x 10")
Weight ласа we 22.4 kg (49.5 Ibs)
* For improvement purposes, specifications and design are subject
to change without notice.

TROUBLE SHOOTING CHART
The
conditions
listed
below
do
not
indicate
mechanical
failure
of
your
unit.
If
your
machine
exhibits
any
of
these
conditions, check for trouble as indicated.
SYMPTOM
TROUBLE
REMEDY
16
Loss of sensitivity and tone
quality.
* Dirty Erase Head.
* Wrong side of tape facing
the heads.
A.C. power lower than the
voltage to which your
machine is adjusted.
* Magnetized head.
* Tape Selector Switch is
set incorrectly.
See HEADS SHOULD ALWAYS
BE KEPT CLEAN.
See VOLTAGE & CYCLE
CONVERSION.
See HEAD DEMAGNETIZING
Machine will not record or play.
Check positions of controls
and input/output
connections.
Check position of the
Pause Button.
Check positions of the
Stereo Selector.
Irregularity in tape transport.
Oil or magnetic particles
adhering to the Capstan or
Pinch Wheel.
Sticky or dirty tape
surface.
* Improperly loaded tape.
* A.C. power lower than the
voltage to which your
machine is adjusted.
Sensing tape is affixed
improperly.
See PINCH WHEEL &
CAPSTAN CLEANING.
See TAPE LOADING.
See VOLTAGE & CYCLE
CONVERSION.
See AUTOMATIC & MANUAL
REVERSE PLAYBACK.
Tape will not run.
Blown fuse.
* Power is not being supplied.
Machine is set to
pause mode.
Twisted or sticky tape.
Check power cord, Power
Switch, and Shut-Off Button.
Previous recording will not erase.
Erase head is dirty.
See HEADS SHOULD ALWAYS
BE KEPT CLEAN.
Distorted or noisy sound.
Recording level is too high.
Check external source
controls and connections.
Normal recording level
is “0? VU.
“Surround Stereo” used with permission of Vangard Records.