Akai ABTS- M10 User manual
AKAL
TAPE
RECORDER
woo.
IWI=10
2B
BO
MRR
SSS
<
TABLE
OF
CONTENTS.
SPECIFICATIONS
....
0.
cece
ee
ene
1
MEASURING
METHOD
......
2...
00
eee
eee
ees
2
CONTROL
LOCATIONS
...
2.0...
eee
eee
ee
eee
4
DISMANTLING
OF
TAPE
TRANSPORT
UNIT
&
AMPLIFIERS
....
2.6.06.
ccs
ence
eee
eee
ees
5
TRANSPORT
MECHANISM
..........0-02
02
eee
eee
7
MECHANISM
ADJUSTMENT
............-2+2
2000)
11
AMPLIFIER
ADJUSTMENT
...
1.0.0...
eee
ee
eee
eee
19
MAINTENANCE
PROCEDURES
.......-..-2--00055
21
COMPOSITE
VIEWS
OF
COMPONENTS
..........--
22
TROUBLE
SHOOTING
CHART
..........------
05s
25
SCHEMATIC
DIAGRAM
I.
SPECIFICATIONS
STYLE
:
Portable
WEIGHT
37.4
lbs
(17
kg)
DIMENSIONS
14”
x
14”
x
8-7/8”
(358
x
358
x
227
mm)
POWER
SUPPLY
AC
100
to
240
V,
50/60
Hz
RECORDING
SYSTEM
In-line
4-track
stereo,
monaural
record-
ing
by
using
Cross-field
Bias
Head.
PLAYBACK
SYSTEM
IN-line
4-track
stereo,
monaural
play-
back.
TAPE
SPEED
1-7/8,
3-3/4
and
7-1/2
ips.
TAPE
SPEED
DEVIATION
Within
+
0.8%
WOW
AND
FLUTTER
(Play
back
only)
:
Less
than
0.1%
1r.m.s.
at
7-1/2
ips.
Less
than
0.2%
r.m.s.
at
3-3/4
ips.
Less
than
0.3%
r.m.s.
at
1-7/8
ips.
FREQUENCY
RESPONSE
30
to
25,000
Hz
+
db
at
7-1/2
ips.
30
to
18,000
Hz
+
db
at
3-3/4
ips.
40
to
9,000
Hz
+4
db
at
1-7/8
ips.
SIGNAL
TO
NOISE
RATIO
:
Better
than
48 db
(Forward
Operation)
-
Better
than
45
db
(Reverse
Operation)
DISTORTION
Within
3%
at
Line
Output,
1,000
Hz
O
VU
Recording
and
Playback.
CROSS
TALK
Less
than
—65
db
(Monaural)
Less
than
—43
db
(Stereo)
ERASE
RATIO
Less
than
—70
db
INSULATION
RESISTANCE
:
More
than
50
M.Ohms
INSULATION
DURABILITY
:
$00
V.
AC
for
more
than
one
minute
duration.
LINE
OUTPUT
Output
Impedance
........
100
Ohms.
Required
load
impedance
more
than
25
K.Ohms.
1.23
V
(+4
dbs)
POWER
OUTPUT
8
Watts
(r.m.s.)
per
channel,
total
16
(External
watts
.
Speaker
Jack)
Inpedance:
«4
vscceas
coeds
8
ohms
DIN
OUTPUT
:
O4V
Output
Impedance
.......
10
K.Ohms.
Required
load
impedance
more
than
50
K.Ohms.
LINE
INPUT
Above
50
mV
(~25
dbs)
Impedance
.......:.....
175
k.Ohms.
DIN
INPUT
High
........
Above
50
mV
(—25
dbs)
Impedance
........
150
mV
(—45
dbs)
LOW
exe
ee
ont
Avove
5
mV
(—45
dbs)
Impedance
.............
27
K.Ohms.
MIC.
INPUT
Above
0.5
mV
(—65
dbs)
Impedance
.............
4.7
K.Ohms.
FAST
FORWARD
AND
REWIND
TIME
:
85
seconds
for
a
full
1,200
foot
tape
at
50
Hz.
65
seconds
for
a
full
1,200
foot
tape
at
60
Hz.
MONITOR
SYSTEM
:
The
program
being
recorded
can
be
monitored
by
using.
Stereo
Headphonc
(8
Ohms)
.......
Stcteo
Headphone
Jack.
Crystal
Receiver
.
Line
Output
Jack.
MOTORS
CAPSTAN
MOTOR
Hysteresis
Synchronous
3-speed
(2-4-8
pole)
motor
Condenser
Capacity
3
uF
(50
Hz)
2
uF
(60
Hz)
Revolution
3,000
—
1,500
750r.p.m.
(50
Hz)
3,600
—
1,800
900r.p.m.
(60
Hz)
REEL
MOTOR
i112,outer-rotor
motors.
Revolutions
930
r.p.m.
at
50
Hz
100
V
1,120
r.p.m.
at
60
Hz
110
V
HEADS
REC/PLAY
HEAD
:
In-line
4-track
stereo
and
monaural
Impedance
...
1,200
Ohms
at
1,000
Hz.
Capi:
fii
ote
Bae
OF
Se
2/1,000
mm
ERASE
HEAD
In-line
4-track
stereo
Impedance
......
500
Ohms
at
60
KHz.
Gap:
erected
Be
0.2mm
BIAS
HEAD
In-line
4-track
stereo
Impedance
......
500
Ohms
at
60
KHz.
Gap:
:onccrseea
ea
taal
aca
Se
0.2
mm
RECORDING
LEVEL
INDICATOR
VERTICAL
Indication
VU
Meter
x
2
TRANSISTOR
&
IC
USED
2
ICAA-072D
4
2SD92
2
2SC458
(B)
7
28C372
4
2SC693FU
4
2SC971
1
2SD223
DIODE
USED
1
SB-3-01P
3
IN34A
1
10D4
15B2
4
V06C
1
RD24A
(M)
REELS
USED
7”,
5”,
3”
reels
10-1/2”
Reel
Adaptor
available
optional
accessory)
a
ll.
MEASURING
METHOD
TAPE
SPEED
DEVIATION
1.
Method
involving
use
of
pre-recorded
tape.
For
measuring
the
tape
speed
diviation,
play
back
the
pre-recorded
tape
at
1,000Hz+
0.1%.
Connect
the
appropriate
output
to
a
frequency
counter
meter
in
order
to
measure
the
tape
speed
deviation
from
the
resulting
deviation
of
the
measured
frequency.
2.
Method
involving
use
of
timing
tape.
(designed
for
tape
speed
measurement)
This
method
utilizes
a
timing
tape
marked
at
intervals
of
7-1/2”.
The
running
time
of
over
60
marked
sections
of
tape
is
measured
in
order
to
calculate
the
deviation
of
the
tape
speed.
In
applying
this
method,
however,
it
should
be
kept
in
mind
that
the
timing
tape
stretch
or
contract
measurement
enor
is
inevitable,
so
that
it is
necessary
to
measure
the
total
length
of
the
tape
in
advance.
WOW
AND
FLUTTER
Playback
the
3,000
Hz
pre-recorded
tape
of
which
the
wow
and
flutter
level
is
guaranteed
to
be
smaller
than
0.07%
for
measurement
by
means
of
a
wow
meter.
It
is
also
possible
for
a
3,000
Hz
sine
wave
to
be
recorded
and
played
for
measurement
by
means
of
the
wow
meter.
In
this
case,
however,
the
wow
meter
indicates
a
value
as
much
as
twicc
the
value
given
in
the
specifi-
cations
on
the
first
page.
FRQUENCY
RESPONSE
RECORD
:
1)
Give
a
sine
wave
of
1,000
Hz
to
the
Line
Input
of
the
recorder
to
be
tested
through
an
attenuator
from
an
audio
frequency
generator.
2)
Set
the
Record/Playback
Knob
to
“Rec”
position
and
adjust
the
line
input
volume
so
that
the
VU
Meter
needle
indicates
“O”’
VU.
3)
Set
the
Equalizer
Switch
to
7-1/2”
or
3-3/4”
position.
4)
Under
the
condition
described
in
(2),
lower
the
input
level
16
db
by
means
of
the
attenuator.
5)
Record
the
spot
frequency
in
the
range
of
30
Hz
to
25,000
Hz
from
the
audio
frequency
generator.
PLAYBACK
:
6)
Set
the
Record/Playback
Knob
to
“Play”
position.
7)
Connect
a
Vacuum
Tube
Volt
Meter
to
the
Line
Output
Jack.
(VTVM
with
milli
volt
scale.)
8)
Playback
the
reocrded
tape.
9)
Playback
the
recorded
spot
frequencies
and
make
a
memo
of
output
level
and
plot
the
value
on
a
graph.
Mic.
input
Oscillator
Microphone
Line
output
jack
TOTAL
HARMONIC
DISTORTION
FACTOR
1
KHz
Distortion
meter
Audio
Oscillator
Connect
the
measuring
instrument
as
shown
above,
and
record
the
1,000
Hz
sine
wave
at
“O”
VU.
Playback
the
resulting
signal
and
measure
the
overall
distortion
factor.
Measure
the
noise
level
of
the
tape
recorder
with
the
tape
removed
;
connect
the
audio
oscillator
directly
to
the
distortion
meter
for
measurement
of
the
distortion
factor
of
the
oscillator.
The
required
distortion
factor
may
be
obtamed
from
the
results
of
the
above
measuement
by
the
following
formula
:
do=d-di_
dz
where,
do
=
Required
d
=
Overall
distortion
factor
di
=
Noise
level
d2
=
Distortion
factor
of
the
oscillator
(Note
:
New
tape
of
particularly
good
quality
should
be
used
for
measurement
of
the
distortion
factor.)
SIGNAL
TO
NOISE
RATIO
M-10
Set the
Equalizer
Switch
to
“7-1/2
ips”
position
and
playback
a
tape
containing
a
25
Hz
sine
wave
recorded
at
“O”
VU
level
on
a
standard
recorder.
Connect
a
V.T.V.M.
to
the
line
output
jack
of
the
recordir
and
measure
its
output.
Then
remove
the
tape
and
measure
the
noise
level
under
the
same
condition.
Convert
into
decibels
each
of
the
measured
values.
CROSSTALK
(Crosstalk
between
the
tracks)
(TAPE)
Tape
direction
2
Tape
direction
As
shown
in
the
figure,
first
record
a
1,000
Hz
sine
wave
on
track
No.3
at
+3
VU
level.
Next,
remove
the
1,000
Hz
input
signal
and
record
under
a
non-input
condition.
Then,
Playback
the
tape
on
track
No.3
and
No.
1
(reversed
condition
of
tape)
through
the
1,000
Hz
B.P.F.
(Band
Pass
Filter,
Sensitivity....
1:1)
and
obtain
a
ratio
between
the
two
from
the
following
formula.
Eo
C
=
20
log
——*—
(db
eee
Bi
(db)
C
=
Desired
crosstalk
ratio
(db)
Ls
2]
Eo
=
1,000
Hz
signal
output
level
CLZLZZZ2
E2
=
1,000
Hz
crosstalk
output
level
RES
Ei
=
Non-input
signal
record
level
lll.
CONTROL
LOCATIONS
:
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rs
taurion
To
penega?
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Contd
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SEMICEARCE
faci
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DATE
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ALi
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PeaaNRL.
|
IV.
DISMANTLING
OF
TAPE
TRANSPORT
UNIT
&
AMPLIFIERS
sen
a
ee
In
case
of
trouble,
etc,
necessitating
disassembly,
please
disassemble
in
the
order
shown
in
photographs.
Remantle
in
reverse
order.
DISASSEMBLY
OF
TAPE
TRANSPORT
jai
tl
BACK
PAN
DISASSEMBLY
OF
AMPLIFIER
V.
TRANSPORT
MECANISM
4
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3:
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MOTOR
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TAPE
SPEED
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6OHZ
°
TAKE
UP.
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motor
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FM
Fig.
5-1]
AC
COM,
ool
SQ>>—r
TO
FORWARD
—é
(82)
REV4
REVERSE
PLGR.
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AClOOVO
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sovenoip
—17}+
RELAY
—He—
NORMAL
CLOSED
CONTACT
——{}-—
NORMAL
OPEN
CONTACT
Fig.
5-2
1.
SUPPLY
VOLTAGE
OF
BOTH
TORQUE
2.
PINCH
ROLLER
PRESSUR
1.5
Kgr
MOTORS
DURING
RECORDING/PLAYBACK
TO
1.8
Kgr.
Recording/Playback
(Normal
Recording)
[ee
a
a
SUPPLY
Set
Recording/Playback
Knob
(A)
to
Playback
Position.
30
V
(50
to
60
gr)
The
Pinch
Roller
presses
against
Capstan
to
move
the
47
V
(100
gr)
tape
at
the
rated
speed.
The
Brake
Levers
free
the
Brake
severse
and
the
Lever
Spring
(G)
turns
‘“‘ON’’
Microswitch
60
V
(180
gr)
(SW006)
(F)
so
that
both
torque
motors
become
operative
(at
shown
in
diagram
illustration).
3.
-REVERSE
(BLOCK
DIAGRAM
ILLUSTRATION)
At
Playback
position,
when
Reverse
button
(B)
is
depressed
or
the
sensing
tape
passes
the
sensing
pole
At
Playback
position,
when
Reverse
button
(B)
is
depressed
or
the
sensing
tape
passes
the
sensing
pole
(Si),
the
base
of
TRO202
is
grounded.
The
operation
of
TRO0202
is
stopped
and
the
voltage
sent
to
the
base
of
TRO203
and
operates
it.
Reverse
Relay
RLO201
is
actuated
and
Reverse
is
effected.
At
the
same
time,
the
discharge
current
of
Condenser
C0205
(100M/16V)
actuates
TRO401
and
TR104
which
assume
operating
position
within
a
period
of
from
4
to
8
seconds.
Tension
Relay
(RL0401)
is
actuated
and
a
higher
voltage
than
during
reverse
playback
time
(47
V)
is
supplied
to
the
Take-Up
torque
motor.
At
the
sametime
Mute
Relay
(CRL1017)
mutes
the
playback
output
signal.
Plunger
(SRO301)
operates
and
lowers
the
playback
head.
10
4,
FAST
FORWARD
When
Fast
Forward/Rewind
Knob
is
set
to
Forward
position,
SW003
(block
diagram)
enters
forward
po-
sition.
Brake
Levers
(E) (E)
free
brake.
Lever
Spring
(G)
turns
‘‘ON”
Microswitch
(F)
and
the
TAKE-UP
Torque
Motor
rotates.
5.
REWIND
When
Fast
Forward/Rewind
Knob
is
set
to
Rewind
position,
SW002
(block
diagram
enters
rewind
position.
Brake
Levers
(E)
(E)
free
Brake.
Lever
Spring
(G)
turns
“ON”
Microswitch
(F)
and
the
SUPPLY
Torque
Motor
rotates.
Fig.
5-4
11
AUTOMATIC
STOP
MECHANISM
When
the
tape
is
threaded
on
pin
(B),
if
the
tape
is
accidentally
broken
or
comes
to
the
end,
Automatic
Stop
Lever
(A)
drops
to
its
original
position.
When
the
tape
is
broken
or
comes
to
the
end,
Plate
Spring
(C),
located
below
the
Automatic
Stop
Lever,
depresses
a
projected
pin
on
Eccentric
Gear
(D).
Eccentric
Gear
(D)
gears
into
Flywheel
(E)
to
begin
rotation
of
the
Eccentric
Gear.
This
rotating
action
operates
Lever
(L),
which
is
connected
to
the
base
of
the
Eccentric
Gear,
and
pushes
up
Instant
Stop
Lever
(G).
When
Instant
Stop
Lever
(G)
is
lifted,
Shut-Off
Lever
(J)
contacts
Micro
Switch
(K)
and
the
current
supply
is
cut
off.
Thus,
automatic
stop
control
is
provided
in
Recording
and
Playback
modes.
In
Fast
Forward
and
Rewind
modes,
the
same
operation
takes
place
except
that
Lever
(H)
works
to
push
back
the
FF,
Rewind
Shaft
to
“Stop”
position.
(See
Figs.
5-5
to
5-8)
is
‘
ik
MECHANISM
ADJUSTMENT
Vi.
ILLUSTRATION
OF
4TR
X-FIELD
HEAD
Fig.
6-1
i
13
1)
2)
14
0.125~015mm
ina
|
q
aii
|
oF
1
ns
sie
o
Wl
i
|
i
LY.
=
=
SLIDE
SWITCH
ADJUSTING
SCREW
!
B
ADJUSTMENT
OF
HEAD
HEIGHT
(SEE
FIGURES
6-2AND
3).
To
adjust,
turn
screws
(a)
(b)
(c)
(Fig.
6-2)
During
“Normal
Play”
position
so
that
theupper
edge
of
the
upper
core
of
the
Playback/Rec
Head
is
the
same
height
as
the
upper
edge
of
the
tape.
Adjust
by
turning
screw
(d)
(Fig.
6-2)
during
“Reverse
Play”
position
so
that
the
lower
edge
of
the
lower
core
of
the
Playback/Rec
Head
is
the
same
height
as
the
lower
edge
of
the
tape.
Erasing
Head
Adjust
screw
(H)
so
that
the
upper
edge
ofthe
upper
core
is
0.125
to
0.15
mm
higher
than
the
upper
edge
of
the
tape.
In
adjusting
Head
Height,
make
sure
that
the
front
of
the
Head
is
at
right
angles
to
the
Chassis
and
that
the
upper
and
lower
part
of
the
Head
firmly
contacts
the
tape.
i
Ups
ee
Lily
Us
0+0.05mm
Fig.
6-2
ve
iT
/4
=n
;
|
|
ae
|
in
7
oe
SLIDE
SWITCH
=
'
ca.
Fig.
6-3
2.
ADJUSTMENT
OF
AZIMUTH
ALIGNMENT
1)
Playback/Rec
Head
2)
Use
a
pre-recorded
tape
(16
KHz,
7-1/2
ips),
and
connect
a
high
sensitivity
V.T.V.M.
to
the
line
output
jack.
Adjust
screws
(c)
(e)
so
that
line
output
voltage
is
maximum.
Erasing
Head
Visually
check
to
assure
that
the
center
line
of
the
Erasing
Head
is
at
right
angles
to
the
Head
Chassis.
ILLUSTRATION
OF
REEL
TABLE
AND
REEL
MOTOR
BLOCK
|
i
—_
il
TT
Figs.
6-4
15
BRAKE
ADJUSTMENT
Using
a
Tension
Gauge,
and
a
60
mm
tape
wound
on
a
5”
Reel,
measuring
can
be
done
as
per
drawing.
Measure
the
brake
tension
as
shown
in
the
drawing.
300
gr
is
standard.
To
regulate
tension,
change
the
position
of
the
sus-
pended
springs
(Si:
and
S2
in
Fig.
6-5)
or
loosen
screws
(A)
(B)
and
regulate
position
of
the
spring
suspension
metal
fitting
(D).
16
|
REEL
HEIGHT
ADJUSTMENT
(SEE
DIAGRAM
ILLUSTRATION)
Loosen
Reel
Table
Screws
and
regulate
height.
ZZ
LL
"ZZ
LLL
aes
LLL
LL
LLL.
AA
Twit
inririiddiiidd
to
wa
a
SS
=
3
BRAKE
TENSION
ADJUSTING
SCREW
REEL
TABLE
ADJUSTING
SCRE
O
EP
D
REEL
TABLE
Fig.
64
ILLUSTRATION
OF
MAIN
MOTOR
BOLCK
Fig.
6-7
18
ILLUSTRATION
OF
SWITCH
LEVER
BLOCK
J
Ere
Ama
“Vy
Ct
ay
Fig.
6-8
19
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