Akai 1730-SS User manual

1730-535
OPERATOR’S MANUAL
~<a SURROUND STEREO TAPE RECORDER Bb
© ©
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AKAI.
MANUFACTURED
&
DISTRIBUTED
BY
AKAI
ELECTRIC
CO.,
LTD./AKAI
TRADING
CO.,
LTD.

TABLE OF CONTENTS
I.
GENERAL
INFORMATION
l-
Specifications
2- Controls ........
Front Panel Controls
Back Panel Controls
3- 4-Channel Stereo Syestem
4-Channel Stereo
Akai Surround Stereo ....
1. OPERATING INSTRUCTIONS
1- 4-Track Recording/Playback System
2— Tape Loading
3- Voltage and Cycle Conversion
4- Tape Speed Selection
5- Pause Control..........
6- Automatic Shut-Off ....
7- Fast Forward and Rewind
Playback ..
Stereo Playback
4-Channel Surround Stereo Playback
2-Channel Stereo Playback
Playback Using Stereo Headphones
9- Recording
4-Channel Surround Stereo Recording
Conventional
2-channel
Stereo
Recording
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12
Recording from Other External Sources ....
4-Channel Surround Stereo Recording ..
2-Channel Stereo Recording ...
Dinh JRCKS iiaxsuscuansver caus
Monitoring ........
10- ‘Tape Splicing and Editing .........
I]- Head Cleaning «01...
12~ Head Demagnetizing
13- Tape Erasing
14-
Trouble-Shooting
Chart
F
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ll. ACCESSORIES
l- Standard Accessories.
2- Optional Accessories

|. GENERAL INFORMATION
1- SPECIFICATIONS
Track System. cco sevsssesss-cseacies 4-track 4-channel/2-channel compatible stereo
Max. Reel Size ...........00....00.05 iad
Tape
Sp66d
apace
ertiscsicieceunes
7-1/2
&
3-3/4
ips
(+1%)
Wow/Flutter
...............:eceeeeee
0.12%
RMS
at
7-1/2ips
0.15% RMS at 3-3/4 ips
Frequency
Response.................,
30Hz
to
22,000Hz
(+3dB
at
7-1/2ips);
30Hz
to
15,000Hz
(+3dB
at
3-3/4
ips)
S/N Ratio Better than 50dB
Distortion Less than 1.59% (7-1/2 ips) (1,000 Hz “0° VU recording)
Erase Ratio...........-.seccesssssesseee Better than 70dB
Equalization:
j.cicsciiccvcrensiesiedsees
Correct
equalization
for
playback
of
tapes
recorded
to
NAB
curve
Recording Bias Frequency ......... 100 kHz
Recording
Level
Indicator...
.
2
twin
type
VU
meters
RGRBS
ca
vxcansecvesnvegnr
essere
ines
Two
4-track
4-channel
stereo
heads
for
recording
and
playback.
Two erase heads (2-track & full track)
Fast Forward & Rewind Time... 75 seconds at 60 Hz (1,200 ft. tape); 90 seconds at 50 Hz (1,200ft.
tape)
Output
Jacks
..,.........0...0...000-
4
Line
Output
Jacks
Output Level: 1.23 V
Max. Load Impedance: more than 20k2; 2 Headphone
Jacks (I ea. front/rear), 82 , 2 Speaker Jacks, 82
Input Jacke: ccsccmopssssiiewmsverdsns 4 Mic Input Jacks: 0.4mV/30k2
4 Line Input Jacks: 40mV/100k2
DIN Jake 3s ssceconnaccospisvesiicoasnis 2 Output/Input DIN Jacks: 04V/5mV
Recording Capacity .................. 4-channel stereo (30 min, at 7-!/2ips using a 1,200 ft. tape)
2-channel stereo (I hr, at 7-1/2ips using a 1,200 ft. tape:
BE BOOE sacs sncsestdesveaeaseoavencnxinaics Hysteresis synchronous 2-speed motor
Music Power ...,....ccccsesssssssesiess 20 W (10 W each channel)
Undistorted Power .................. 14 W (7 W each channel)
Semi-Conductors
..............-..5065
19
Transistors
10 Diodes
Integrated
Circuits
..................
8
Linear
IC,
2
Power
IC
Speakers............ccsrceeseessersesseees
Two
4"
built-in
Speakers
Power Supply.. ..- AC 100 to 240V , 50/60 Hz
Pewer Consumption.. .. 75 W
Dimensions...................0:00secee 420(W) x 450(H) x 240,D) mm
(16-1/2" x 18" x 9-1/2")
Sd 17 kg (37-1/2 Ibs,

2. CONTROLS
RESET BUTTON
SUPPLY REEL TABLE
REEL RETAINER
Built-In Reel Retainer locks reel firmly into place.
CYCLE CONVERSION SWITCH (A)
“Out
position,
50
[fz
;
in”
position.
60
Hz.
PINCH WHEEL
Presses against capstan to transport tape.
CAPSTAN
“Transports tape.
HEAD COVER
Houses
(trom
left
to
right)
Full
Track
Rrase,
2eTrack
Erase,
Recording, and Playback Heads,
HEADPHONE
JACK
(Front
Channel)
For
use
in
monitoring
front
channel,
Use
Stereo
Headphones
of 82
impedance.
SPEAKER
Built-In
4”
front
channel
speaker
(for
2-channel
operation)
HEADPHONE JACK (Rear Channel)
For use in monitoring rear channel. Use Stereo Meadpluones
of 8Q impedance.
RECORD SAFETY BUTTON
= |
p SER SR ]
SURROUND
STEREO
RECORDING LEVEL CONTROL
(Right Front Channel)
For adjusting recording input level of right front channel.
Adjust while observing right front VU Meter,
RECORDING
LEVEL
CONTROL
|
—
:
==
(Left Front Channel)
For
adjusting
recording
input
level
of
left
front
channel.
Adjust
while
observing
left
front
VU
Meter.
TAPE
SPEED
SELECTOR
MICROPHONE JACK (Right Front Channel)
For right front channel recording.
MICROPHONE JACK (Left Front Channel)
For left front channel recording.
MONITOR SWITCHES
‘To monitor program source, depress SOURCE Switch. To
monitor recorded signals or for playback, depress ‘TAPE
Switch.
VU
METER
(Left
Front
Channel)
‘This
meter
indicates
left rear
channel
recording
and
playback
level.
VU METER (Left Rear Channel)
This meter indicates left front channel recording and playback
level.
VU
METER
(Right
Rear
Channel)
‘This
meter
indicates
right
rear
channel
recording
and
playback
level,

Fig. 1
INDEX COUNTER
Por use in locating positions on atape. With Reser Bution,
art Index Counter to “MEME before beginning recording or
playback,
AUTOMATIC SHUT-OFF LEVER
Fer Automatic Shut-Oif, thread the tape through the Autos
matic Shut-OWP Lever and ser the Automatic Shut-Off Switch
to “ON position, When tape comes to the end or iy broken,
the power of the entire unit is cus aff \ convenient safery
feature if the recorder is left unattended.
PLAY;RECORD
LEVER
For
PLAYBACK
mode,
set
PLAY
ty
position.
Dor
RECORD.
ING
mode,
depres
RECORDING
SALTETY
BUPTON
ard
while
holding
at
depressed
position,
ser
PLAYBACK
RLC
LIVER
te
REC
position,
REEL RETAINER
Built-In
Reel
Retainer
locks
reel
firmly
into
place.
TAKE-UP
REEL
TABLE
SPEAKER
Buik-In 4" front channel speaker (for 2-channel operation)
REWIND/FAST
FORWARD
LEVER
Vor
effecting
Kwd,
or
FL
Fwd
Mode.
Deo
not
attempt
to
operate
this
lever
until
Play/Record
Lever
is
returned
to
neutral position (or vice-versa).
PAUSE LEVER
Convenient
for
use
in
temporarily
suspending
tape
movement
during
recording
wr playback
operation,
To
release,
Lift
slightly
upward
and
ther
yeturn
to normal
(lower)
pxosition,
AUTOMATIC SHUT-OFF SWITCH
‘This switeh is linked to the Automatic Shut-OiT Lever. If ar
“ON position, when tape comes to end or is broken, the
power of entire unit is cut. A convenient safety feature if
recorder is left unattended.
POWER SWITCII
RECORDING LEVEL CONTROL
‘Left
Rear
Channel)
Vor
adjusting
recording
input
level
of
left
rear
channel.
Adjust
while
observing
left
rear
VU
Meter.
SPEAKER
VOLUME
CONTROL
For
speaker
volume
control.
Clockwise
increases
volume.
MICROPHONE JACK (Right Rear Channel)
Por right rear channel recording.
MICROPHONE JACK (Left Rear Channel)
Yor left rear channel recording.
STEREO SELECTOR
For 2-channel Stereo operation depress “2 CH” bution and for
4-channel Stereo operation depress “4 CHU’ button,
RECORDING LEVEL CONTROL
(Right Rear Channel}
Vor adjusting recording input level of right rear channel,
Adjust while observing right rear VU Meter,
VU METER (Right Front Channel)
‘This meter indicates dght front channel recording and play-
back level.

SPEAKER SWITCH
Maute,'Normal Speaker Switch
SPEAKER
JACKS
(Left.
Right)
Jacks for connection of external speakers.
DIN JACK (Rear Channel)
Enables inter-connection with external stereo amplifier by use
of a single DIN connection cord (DR-I11 connection cord
standard accessory),
LINE
OUTPUT
JACK
(Right
Rear
Channel)
For
playback,
connect
to
Tape
Input
Jark
(right)
of
external
amplifier.
LINE INPUT JACK (Right Rear Channel)
For rceording, connect to Output [ack Crghe) of external
recording source,
FUSE POST
VOLTAGE SELECTOR PLUG
In case of necessity to change voltage input, remove fuse
post & plug and set plug to proper voltage,
AC CORD
CYCLE
CONVERSION
SWITCH
(B)
This
switch
and
Cyele
Gonversion
Switch
(A)
on
front
panel
must
be
sct
in
accordance
with
area
power
source.
Set
both
switches to 50 of 60) Hz as required,
LINE OUTPUT JACK (Left Rear Channel}
For
playback,
connect
to
Tape
Input
Jack
(left)
of
external
amplifier,
LINE
INPUT
JACK
(Left
Rear
Channel)
For recording, connect to Output Jack (left) of external
recording source,
LINE OUTPUT JACK (Right Front Channel)
For playback, connect to ‘l'ape Input Jack (right) of external
amplifier,
LINE
INPUT
JACK
(Right
Front
Channel)
For recording, connect to Ourpat Jack Cright) of external
recording
source.
DIN
JACK
(lront
Channel)
Hnables
inter-connection
with
external
amplifier
by
use
of
a
siagle
DIN
connection
cord
(D-IL
connection
cord
standard
accessory).
173055
ate ea
LINE OUTPUT JACK (Left Front Channel)
For playback, connect to Tape Input Jack (left) of external
amplifier,
LINE
INPUT
JACK
(Lett
Front
Channel)
For
recording,
connect
to
Output
jack
Cleft}
of
external
recording source.

3-4-CHANNEL STEREO SYSTEM
@ 4-CHANNEL STEREO
In the continued pursuance of more aesthetical
sound, another stereo revolution has taken
place... A new stereo “break-through” from
2-channel to 4-channel stereo,
This “move-up” to 4-channel stereo is cqually
as great an achievement 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 climinates 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,
left
&
right
in
front
and
left
& right
in back
of you,
you
are
literally
surrounded
with
a
wall
of
sound
which
fills
the
“hole
in
the
middle”.
This4-dimensional
musical
reproduction
makes
conventional
2-channel
stereo
seem
empty
and
insufficient.
@
AKAI
“SURROUND
STEREO”
Exhibitions
of
AKAL's
4-channe!
stereo
system
are
already
being
held
in various
parts
of the
world
and
are
being
termed
by the
listeners
as
“SEN
IONAL™,
AKAL's
surround
stereo
supplements
conventional
sterco’s
2)
front
speakers with 2 additional rear speakers to form
the
“2-2
System”,
The
listener
is
surrounded
by
two
sets
of
speakers
(left
&
right
front
and
Jeft
&
right
rear),
This
arrangement
does
not
mean,
however,
that
simply
adding
vo
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 ‘all four
tracks
in
one
direction),
This
4-channel
stereo
tape
feeds
into
4
preamplifiers
and
+
main
amplifiers
to
activate
a
4-speaker
system,
‘Thus,
at
playback
time,
sounds
from
separate
channels
are
emitted
from
cach
speaker,
providing
the
listener
with
a
feeling
that
he
is
listening
to
concert
hall
music
from
the
best
seat
in
the
auditorium,
If
you
are
a
jazz
fan,
for
instance,
you
can
record
and
position
the
speakers
for
playback
so
that
the
spine-tingling
sa
ted
from
the
left
front
speaker,
drums
from
right
front,
piano
from
left
rear,
and
bass
from
right
rear.
This
arrangement
gives
the
listener
1“
sounds
are
emit-
areal
here
in
which
you
have
the
feeling
of
being
exactly
in
the
middle
of
the
live
performance.
sense
of
presence”
creating
an
atmosp-

I]. OPERATING INSTRUCTIONS
1-4-TRACK
RECORDING/
PLAYBACK SYSTEM
The AKAL 1730-SS employs a 4-track system
which can be used for either 4-channe! or 2-
channel stereo recording/playback. Tracks are
selected by operating the STEREO TRACK
SELECTOR Switches.
M4-CHANNEL STEREO RECORD-
ING;PLAYBACK
4-channel stereo recording/playback requires
the simultaneous use of all + tracks in one direc-
tion. Set Stereo Selector to “4-CH" (See
page 3),
@ 2-CHANNEL STEREO RECORD-
ING/PLAYBACK
2-channel stereo recording/playback requires
the simultaneous use of two tracks. Set Stereo
Selector to “2-CII” and use front channel cont-
rols. The first stereo recording/playback takes
place on tracks | and 3, and the second on
tracks 2 and 4 after the reels have been inverted.
2-TAPE LOADING
Place a full reel of tape on SUPPLY REEL
TABLE and an empty reel on the TAKE-UP
REEL TABLE. Thread the tape as illustrated
by the dotted line in Fig, 3.
Lock reels into place with REEL RETAINERS
provided on reel shafts.
IMPORTANT : Be sure to thread tape through
AUTOMATIC SHUT-OFF LEVER.
4-track 4-channel stereo tape
1 — Front Left CH
2
Sarat
<a
Rear
Left
CH
3 oe Front Right CH
4
_—_——
Rear
Right
CH
1 —_—_ Left CH
2 —_— Right CH
3 _—_ Right CH
4
——
Left
CH
—> Side A + Side B
4-track 2-channel stereo tape
ee , Gee

3-VOLTAGE AND CYCLE CON-
VERSION
@ VOLTAGE
Model 1730-SS is operable anywhere in the
world, With the built-in step-down power trans-
former, the operator can easily readjust the
recorder
to
any
one
of
the
six
stages
of
power
voltage from 100 to 240 volts A.C, The operator
is requested to check the previously set voltage
before operation. If another voltage ts required,
readjustment can be made as follows:
il) Remove the FUSE POST as shown in
Fig, A. Remove VOLTAGE SELECTOR
PLUG
and
reinsert
to
standard
area
voltage.
2;
The
VOLTAGE
SELECTOR
as
shown
in
Figs.
B,C.
and
Dis
a
rotable
plug-in
type
offering
6
selections
/100/110/120/200/220/
240),
3,
Change
the
fuse
according
to
voltage,
7 =e
Velie TOOW te 120 200V ww OV |
| Le aaa |
CAUTION:
Disconnect
power
plug
from
AC
outlet
before
readjusting
voltage,
To
maintain
optimum
performance
and
prolong
the
life
of
your
machine,
it
is
important
that
the
line
voltage
be
held
within
10 percent
deviation
of
standard
voltage,
@ CYCLES
Correct tape speed cannot be obtained if the
‘
CYCLE
CONVERSION
SWITCHES
are not
OWT 50Hz OUT SOHz properly positioned. CYCLE CONVERSION
~~ SWITCH (A) is located on the upper center
of the face panel and (B) ts located at the rear
of the recorder. Using a screw driver, rotate
CYCI.E CONVERSION SWITCH (A) coun-
ter-clockwise approximately one-cighth — of
IN
6OHz
:
;
IN
6OHz
aturn.
The
switch
can
then
be
moved
cither
OUT or IN. 50 cycle operation is obtained by
moving the switch OUT (Fig. A-1) and 60 cycle
operation, by moving the switch IN (Fig. A-2).
The switch should be rotated back to its original
position after it has been moved co either IN or
OUT | position. CYCLE CONVERSION
SWITCH (B) must also be reset accordingly,
CAUTION: Do not attempt to rotate the
CYCLE CONVERSION SWITCHES when
the motor is not running.

4-TAPE
SPEED
SELECTION
he
4
-)
ej)
J)
The
1730-SS
Surround
Stereo
Tape
Recorder
operates
on
two
tape
speeds
(3-3/4
and
7-1/2
ips).
For
quick
and
easy
tape
speed
selection,
operate
convenient
TAPE
SPEED
SELECTOR,
334
RECORDING TIME
TAPE
SPEED
L
Tape 4-Track 4-Track
Length
4-Channel
2-Channel
T —
los em/sec.| 19 cm/sec, | 9.5 em/sec.| 19 cm/sec.
(3-3/4 ips) | (7-1/2 ips) | {3-3/4 ips) | (7-1/2 ips)
1,200 ft.| I hour 0.5 2 i
1,800 ft. 15 0.75 3 1.5
2,400 ft. 2 2
Bee eS
Fig. 6
5-PAUSE CONTROL
To
momentarily
stop
the
tape
during
recording
playback,
set
the
PAUSE
LEVER
to
“Pause”
position
(as
shown
in
Fig.
7).
PAUSE
CONT-
ROL
will
not
function
during
fast
forward
or
rewind
operation,
PAUSE CONTROL is useful in editing the
tape
during
recording
(lift
lever
to
stop
record-
ing
when
a
certain
portion
of
the
program
is
not
desired).
Note
that
when
the
lever
is
releas-
ed
and
recording
again
commences,
no
annoy-
ing “click” is impressed on the tape.
7-FAST FORWARD AND
REWIND
Fast Forward or Rewind is performed by
operating FAST FORWARD/REWIND LE-
VER. Fast Forward or Rewind permits rapid
selections of recordings on the tape. The Fast
Forward/Rewind Lever is automatically locked
into
position
and
cannot
be
operated
while
PLAYBACK
LEVER
is
in
operation
and
vice-versa.
6-AUTOMATIC SHUT-OFF
One of the exclusive features of Model 1730-SS
is the function of the automatic shut-off unit.
If the AUTOMATIC SHUT-OFF SWITCH
is
set
to
“ON”
position,
when
the
tape
comes
to
the end or is accidentally broken, the AUTO-
MATIC SIIUT-OFF LEVER drops, cutting off
the
power
of
the
entire
unit.
Aer
,
|
Rec
|
ww
—
=
Fig. 9

8-PLAYBACK
*
(TACE OME» Hy 2 REAR REC LEVEL ——VvoLuraR,
Geel
clooe
B STEREO PLAYBACK
Please be sure to check the following prior to
RIGHT
&
LEFT
.
operation,
@
*
Heads
are
clean
and
free
of
dust.
* As tape which has not been used for a
RECIPE tats ee period of time may have become sticky, run
LINE
INPUT
tape
once
before
using.
* Tape
is loaded
properly.
Fig. 11

@ 4-CHANNEL SURROUND
STEREO PLAYBACK
FRC AT
CWE Foe
Mure.
{ffi
Norma
Richt #5
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EX ERNAL 5) EAKERS ~
REC /P a
LINE INPUT —
Model 1730-SS is equipped with a builtin
2-channel power amplifier.
Therefore, a 2-channel external amolifier and,
an
extra
pair
of
speakers
are
all
that
is
necessary
for
4-channel
surround
stereo
playback.
If a 2-channel stereo amplifier is used, connect
FRONT CHANNEL LINE OUTPUT
JACKS to TAPE. INPUT JACKS of external
amplifier. Connect a pair of rear speakers to
the Speaker Terminals of Model 1730-SS and
another pair of front speakers to the external
@ 2-CHANNEL STEREO PLAYBACK
Connect
power
plug
and
load
a
2-channel
stereo pre-recorded tape.
@ Turn on POWER SWITCH,
@® Depress 2-GH STEREO SELECTOR.
@© Select Tape Speed.
@ Set Speaker Switch to NORM.
@®
Depress
TAPE
MONITOR
SWITCH.
@®
Set
PLAYBACK/REC
LEVER
to
PLAY
and
adjust
SPEAKER
VOLUME
CONT-
ROL.
@ Invert reels for playback on tracks 2-4.
Note:
The
2-channel
internal
power
amplifier
of
Model
1730-SS
automatically
switches
to
rear
channel
operation
when
the
4-Channel
Stereo
Selector
is
depressed,
and
to
front
channel
operation
when
the
2-Channel
Stereo
Selector
is
depressed.
Cerr
REC/P.B.
LINE INPUT
amplifier. (Refer to Fig: 12).
If wvo 2-channel stereo amplifiers are used,
connect REAR & FRONT CHANNEL
LINE
OUTPUT
JACKS
respectively
to
TAPE
INPUT
JACKS
of
both
external
amplifiers.
Connect
a
pair
of
speakers
to
the
Speaker
Terminals
of
both
external
amplifiers,
and
set
speaker
switch
of
Model
1730-SS
to
MUTE
position
Connect
power
plug
and
load
a
4-channel
sterco
pre-recorded
tape.
M TE
NOF MAL
te
ric it 2
.
©)
(e)
EXTERNAL. SPEAKERS
Sere)
eit fe ES,
leevocvese
Fig,
12
&® Turn on POWER SWITCH. ;
(B Depress 4-Cl1 SELECTOR SWITCH.
@ Select Tape Speed.
© Set Speaker Switch to NORM.
(®
Depress
TAPE
MONITOR
SWITCH.
®
Set
PLAYBACK/REC
LEVER
to
PLAY
and
adjust
speaker
Volume
Control
of
Model
1730-SS
and
Speaker
Volume
Con-
trols,
etc.
of external
amplifier.
rxx
Ney
O00
OG:

9-RECORDING
Please
be
sure
to
check
the
following
prior
to
operation :
*
Heads
are
clean
and
free
of
dust.
*
Heads
are
demagnetized,
*
Use
good
quality
tape
(new
tape
gives
best
results).
*
As
tape
which
has
not
been
used
for
a
period
of
time
may
have
become
sticky,
run
once
before
using.
*
Tape
is
loaded
properly.
@
PLAYBACK
USING
STEREO
HEADPHONES
Two
separate
front
and
rear
channel
Stereo
Headphone
Jacks
are
provided
for
your
convenience,
In
case
of
2-channel
playback,
use
front
channel
Headphone
Jack
only.
For
private
listening,
use
Stereo
Headphones
of
low
impedance
type
(82).
AKAL
Model
ASE-22
is
highly
recommended.
MOOBOOO
Es

F<
FN,
BACK
GROUND
MUSIC
B
4-CHANNEL
SURROUND
STEREO
RECORDING
Connect
power
cord
and
load
a
tape.
@
Turn
on
POWER
SWITCH.
®
Depress
4+-CH
STEREO
SELECTOR.
© Select Tape Speed.
@®
With
RESET
BUTTON,
set
INDEX
COUNTER
to
“OOOO”.
This
Index
Counter
provides
an
easy
reference
for
locating
positions
on
the
tape,
©
Insert
microphone
plugs
into
MICRO-
PHONE
JACKS
(front
left
&
right
and
rear
left
&
right).
#)
Depress
SOURCE
MONITOR
SWITCH.
@
Set
PAUSE
LEVER
to
PAUSE
position,
@
While
depressing
RECORDING
SAFETY
BUTTON,
set
PLAYBACK/REC
LEVER
to
REC.
}
Adjust
and
balance
microphone
volume
levels
by
operating
corresponding
REC
LEVEL
CONTROLS
while
observing
corresponding
VU
Meters.
Normal
record-
ing
should
not
exceed
“O"
VU
on
any
of
the
respective
VU
Meters.
J)
When
an
optimum
recording
level
has
been
determined,
release
PAUSE
LEVER
to
begin
recording.
®
‘To
stop
recording,
return
PLAYBACK/
REC
LEVER
to
STOP
(vertical)
position.
1)
In
case
of
using
headphones
for
monitoring
recorded
signals,
depress
TAPE
MONITOR
SWITCH,
CONVENTIONAL
2-CHANNEL
STEREO
RECORDING
For
conventional
2-channel
stereo
recording
substitute
the
following
steps
for
steps
® &
of
4-channel
stereo
recording
procedure
and
add
step
QD.
@® Depress 2-CH STEREO SELECTOR.
Insert’
microphone
plugs
into
MICRO-
PHONE
JACKS
(front
left
&
right),
Maintain
a
distance
of
at
least
2
meters
(7
ft.)
between
microphones.
@ Invert reels for recording on tracks 2-4,
There are many possibilities for microphone
placement. Experiment with a variety of
positions according to your own niusical taste.
Fig.
17

H
RECORDING
FROM
OTHER
EXTERNAL
SOURCES
From another tape recorder
For 4-channel Surround Stereo recording,
connect the front and rear LINE OUTPUT
JACKS of the playback recorder to the front
and rear LINE INPUT JACKS of Model
1730-SS
instead
of
Step
@
of
4-channel
surround
stereo recording procedure,
PLAY
BACK
MACHINE
RECORDING MACHINE
Fig.
20
B 4-CHANNEL SURROUND STEREO
RECORDING
For 4-channel stereo recording, connect the
front & rear channel LINE INPUTS of Model
1730-SS to the front & rear channel OUTPUTS
of your 4-channel external source instead of
step © of 4-channel stereo recording procedure.
RONT
ies CINE OUTPUT
RIGHT REC./P.B, LEFT
Ll eece LINE INPUT ied
Fig.
18
REC./P.B. LE =
LINE INPUT ee |
Fig.
19
For
2-channel
recording,
connect
the
LINE
OUTPUT
JACKS
of the playback
machine
to
the front
channel
LINE
INPUT
JACKS
of
Model
1730-SS
instead
of Step
© of conven-
tional
2-channel
stereo
recording
procedure,
PLAYBACK
MACHINE
RECORDING
MACHINE
Fig.
21
@ 2-CHANNEL STEREO
RECORDING
From
an
external
amplifier
(fig.
18)
Connect the OUTPUT leads of the external
amplifier or tuner amplifier to the front channel
LINE INPUT JACKS instead of Step 65 of con-
ventional 2-channel sterco recording procedure.
From a record player (fig. 19)
A “crystal pick-up” or a “ceramic pick-up” can
be
connected
directly
to
the
front
channel
LINE
INPUT
JACKS
instead
of
Step
@
of
conventional
2-channel
stereo
recording
proce-
dure. If a “magnetic cartridge” is used, for
proper equalization, it must be connected to the
Line Input Jacks through an external amplifier.

REC/FB.
Left
RIGHT
REC/PO.
LEFT
{
EXTERNAL
SPEAKERS
1
LINE INPUT
————
tine
eur ———!
Fig. 22
@
DIN
JACKS
The DIN JACKS at the rear of the recorder
are for use in inter-connecting Model 1730-SS
with
an
external
stereo
amplifier.
This
system
enables
easy
recording
and
playback
through
an
external
amplifier
as
the
complex
connec-
tion or disconnection of several separate plugs
is not necessary.
An
AKAI
DR-!11
DIN
Connection
Cord
has
been
included
in the
standard
accessories
for
your
convenience,
HB
MONITORING
For monitoring, connect Stereo Headphones to
Front or Rear STEREO HEADPHONE
JACK. Stereo Headphones should be of 82
impedance type, ARAL Model ASE-22 is highly
recommended,
10-TAPE SPLICING AND
EDITING
Cut tape diagonally with an overlap so that
the ends are lined up (cutting tape on diagonal
eliminates detection of the splice in recording).
Cover aligned ends with SPLICING TAPE.
Press firmly, exerting pressure to secure ends
evenly, Trim off excess splicing tape (Cut into
recording tape very slightly as illustrated by
dotted lines. This eliminates the possibility of
a sticky splice). Splicing of tape using scissors
requires skillful work. With our specially
designed PORTABLE SPLICER, splicing can
be done very smoothly.

11-HEAD CLEANING
Tape Oxide/Dust Deposits Cause 90% of
Tape Recording Failures
For quality performance it is imperative that
tape recorder heads be kept clean at all times.
Dust and magnetic particles from the tape
tend to deposit on the heads after prolonged
use of the recorder. This results in poor head-
to-tape contact deteriorating sound quality and
sensitivity. Such dust causes drastic drops in
recording/playback levels and nullifies high
quality sound,
Make it a rule to clean the heads every time
your
use
your
recorder,
AKAT's
Head
Cleaning
Kit Model HC-500 is recommended for remov-
ing
foreign
matter
deposited
on
the
heads.
Note:
Set
Playback/Rec
Lever
to
PLAY
position
while
cleaning
the
heads.
EXAMPLE
CLEAN
HEAD
Frequency
response
curve

12-HEAD DEMAGNETIZING
Normally the steel pole pieces which form a
part of the Recording and Playback Heads
become
slightly
magnetized,
The
effect
of
slight head magnetization is that it partially
erases
the
tape,
especially
at
high
frequencies,
Generally,
this
condition
can
be
detected
by
the loss of high frequency response which can-
not
be
corrected
through
head
alignment,
d
by using magnetized tools in the vicinity of the
Severe magnetization (which may be caus
heads) will result in’ noise or considerable
distortion in addition to the loss of high frequen-
cy response, Although Model 1730-SS already
has
a
built-in
head
demagnetizing
circuit,
it
is
recommended that head demagnetization be
performed periodically. This can be accomp-
lished by touching the head lightly with the
demagnetizer and making several small circular
motions over all heads surface areas as well as
the head housing.
NOTE: To avoid scratching the bead surface.
we
suggest
that
you
cover
both
prongs
of
the
head demagnetizer with a sort of masking tape,
13-TAPE ERASING
Any signals previously recorded on the tape
will
be
automatically
erased
as
a
new
record-
ing is made. For erasing only, load tape and
set
recorder
to
recording
mode.
Model
1730-
is equipped with separate 2-channel and full
track erase heads, For full track erase, set
STEREO TAPE SELECTOR to “4-CH”
position
and
for
2-Channel
erase,
set
to
“2-CH™
position. No plugs should be connected to the
line
input
jacks
or
microphone
jacks.
For
quick and complete erasing, the use of a Bulk
Tape Eraser is recommended,

14-TROUBLE
SHOOTING
CHART
The
conditions
listed
below
do
rot
indicate
mechanical
failure
of
your
unit.
If
your
machine
exhibits
any
of
these
conditions,
check
for
trouble
as
indicated.
Loss
of
sensitivity
and
tone
quality
-
Dirty
Erase
Head
This
prevents
pre-recorded
material
from
being
completely
erased.
- Dust adhering to Recording Head
For head cleaning instructions, see “HEAD
CLEANING” procedure.
+ Magnetized Head
For demagnetizing instructions, see “HEAD
DEMAGNETIZING” procedure.
+ AC Power Voltage lower than the Voltage to
which
your
machine
is
adjusted.
Irregularity
of
tape
transport
+
Grime
adhering
to
heads
+ Oil
on
capstan
+ Sticky
or
dirty
tape
surface
+ Bent
Take-Up
Reel
Will
not
record
-
Check
position
of
controls
and
plugs
of
both
Model
1730-SS
and
external
source
Notes:
|}. Your machine requires constant voltage for optimum performance.
2. Ifthe 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
recommended before attempting a final recording.
3.
Should
there
be
any
problem
with
your
machine,
please
take
it
to
your
nearest
authorize
1
agent
or inquire at our Service Dept. in Tokyo, Japan.
15-LUBRICATION
Although the motor of Model 1730-SS has been
sufEciently oiled for prolonged usc, for maxi-
mum service and optimum performance, take
your machine to your local AKAI Service Agent
for occasional lubrication.

eo}
Ill.
ACCESSORIES
_
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SH
1-STANDARD
ACCESSORIES
7"
4-channel
Stereo
Demonstration
Tape
............0::c0000000
1
7"
Empty
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Connection
Cord
(DR-111)
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Spare:
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2-OPTIONAL
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