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  9. Akai X-1810 User manual

Akai X-1810 User manual

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X<=-1810
ALSO
APPLCABLE
TO
MODEL
X-1810D
MODEL
Il.
Wi,
IV.
VI.
Vil.
VIL.
IX.
ia
TABLE
OF
CONTENTS
SPECIFICATIONS
......
0...
ccc
eee
ee
eee
2
MEASURING
METHOD
........
00...
eee
eee
eres
3
CONTROL
LOCATIONS
.......
0.00.
eee
ee
eee
eee
5
DISMANTLING
OF
TAPE
TRANSPORT
UNIT
&
AMPLIFIERS
2...
0.00.0
c
been
te
eee
nent
eenes
6
TRANSPORT
MECHANISM
..
2.0...
000002
ee
eee
ee
8
MECHANISM
ADJUSTMENT...........-.-0--006-
15
AMPLIFIER
ADJUSTMENT
...........
00000
eee
eee
20
MAINTENANCE
PROCEDURES
.............----5
22
COMPOSITE
VIEWS
OF
COMPONENTS
...........-
23
TROUBLE
SHOOTING
CHART
...........---5-05-
30
SCHEMATIC
DIAGRAM
When
placing
order
for
parts,
please
use
Separate
PARTS
LIST
or
PRICE
LIST
FOR
PARTS.
I.
SPECIFICATIONS
STYLE
Portable
WEIGHT
21.4
kg.
(47
Ibs.)
DIMENSIONS
17.4(W)
x
18(H)
x
9.6(D)”:
(435
x450
x
240
mm)
POWER
SUPPLY
AC
100
to
240V;
50/60
Hz.
RECORDING
SYSTEM
REG)
3.
s:.cce
In-Line
4-track
2-channel
stereo/monaural
CROSS-
FIELD
HEAD
Recording
System
Cartridge
.....
In-Line
8-track
stereo
re-
cording
system
Transfer
.....,
Pre-recorded
conventional
reel
tape
cun
be
transferred
(dubbed)
to
cartridge
tape.
PLAY
BACK
SYSTEM
?
Reel
....cccecees
In-Line
4-track
2-channel
stereo/monaural
playback
system
Cartridge
.....
In-Line
8-track
2-channel
stereo
playback
system
TAPE
SPEED
©
Reel
5..ccevsisee
3
speeds
(1-7/8,
3-3/4,
and
7-1/2
ips)
Cartridge
.....
3-3/4
ips
TAPE
SPEED
DEVIATION
Reel
............
£0.8%
Cartridge
.....
+2%
WOW
AND
FLUTTER
(Fwd
and
Reverse
:
Reel
............
Less
than
0.12%
at
7-1/2
Playback
only)
ips
Less
than
0.25%
at
3-3/4
ips
Less
than
0.35%
at
1-7/8
ips
Cartridge
.....
Less
than
0.35%
FREQUENCY
RESPONSE
Reel
.......s000
30
to
22,000
Hz.
+3
dBat
7-1/2
ips
30
to
18,000
Hz.
+3
dBat
3-3/4
ips
30
to
9,000
Hz
+3
dB
at
1-7/8
ips
Cartridge
.....
50
to
16,000
Hz
+3 dB
EQUALIZATION
:
Correct
equalization
for
playback
of
tapes
recorded
to
NAB
curve.
SIGNAL
TO
NOISE
RATIO
REEL
ssccrcasvuss
Better
than
46
dB
Forward
Operation
at
all
speeds.
Better
than
44
dB
Reverse
Operation
at
all
speeds.
Cartridge.....
Better
than
41
dB.
CROSS-TALK
f
REEL
ctscisecsoce
Better
than
65
dB
(mona-
ural)
Better
than
43
dB
(stereo)
Cartridge
Better
than
50
dB
ERASE
RATIO
®
JReeél:cc
.
Better
than
70
dB
Cartridge
Better
than
65
dB
INSULATION
RESISTANCE
More
than
50
M
Ohms
INSULATION
DURABILITY
1,000V
AC
for
more
than
1
minute
duration
OUTPUT
LINE
OUTPUT
:
(or
Din
Output)
1.228V
(OVU.
+
4
dB
+2
dB)
with
a
250Hz
OVU
Recordec
tape.
Required
Load
Impedance
more
than
20
KQ.
Forword«—+»
Reverse
+2
dB
5W
maximum
per
each
channel
at
music
power.
(Total
10W).
Impedance
80.
MAIN
OUTPUT:
INPUT
LINE
INPUT
60
mV,
Impedance
150
K
9.
MIC
INPUT
0.5
mV,
Impedance
100
KN.
DIN
INPUT
20
mV,
Impedance
68
KO.
FAST
FORWARD
AND
REWIND
TIME
80
seconds
for
a
full
1,200
ft.
tape
at
50
Hz.
65
seconds
for
a
full
1,200
ft.
tape
at
60
Hz.
MONITOR
SYSTEM
:
Program
being
recorded
can
be
moni-
tored
through
Stereo
Headphones.
MOTORS
Capstan
Motor:
Hysteresis
Synchronous
3-speed
(2-4-
8
pole)
motor.
Condenser
capacity
3
uF
(50
Hz),
2
4
F
(60
Hz).
Revolutions
3,000,
1,500,
750
rpm
(50
Hz);
3,600,
1,800,
900
rpm
(60
Hz).
Reel
Motor:
Two
6-pole
eddy
current
outer-rotor
motors.
Revolutions
930
rpm
at
50
Hz,
100V;
1,120
rpm
at
60
Hz,
110V.
HEADS
Rec/Playback
Head:
(Reel)
In-Line
4-track
2-channel
stereo/
monaural
recording/play
back.
Gap:
2/1000mm,
Impedance:
1,200
0
at
1,000
Hz.
Bias
Head:
In-Line
4-track
2-channel
stereo/
monaural.
Gap:
0.2
mm,
Impedance:
5001
at
65
KHz.
Erase
Head:
In-Line
4-track
2-channel
stereo/
monaural,
Gap:
0.2
mm,
Impedance
5009
at
65
KHz.
(Cartridge)
Rec/Playback
Head:
In-Line
8-track
2-channel
stereo.
Gap:
1/1000
mm,
Impedance:
7509
+15%
at
1,000
Hz.
Erase
Head:
In-Line
8-track
2-channel
stereo.
Gap:
0.1
mm,
Impedance:
2109
+10%
at
65
KHz,
RECORDING
LEVEL
INDICATOR
:
Vertical
twin
type
VU
Meters
RECORDING
CAPACITY
Reel
....
.
8
hours
monaural
record-
ing
at
1-7/8
ips
using
a
1.200
ft.
tape.
4
hours
stereo
recording
at
1-7/8
ips
using
a
1,200
ft.
tape.
Cartridge
.....
1
hour
stereo
recording
using
a
300
ft.
cartridge
tape.
65
KHz
+5
KHz.
2.5
to
5
seconds.
BIAS
FREQUENCY:
MUTING
TIME
TRANSISTORS
USED
2SC1060
(B) (C)
vice
4
2SC650
(A)
......
.4
2SC945
(Q)
(R)
.2
2SC968
(3)
(4)..
a7)
28D223
(Y)
1
2SC281
(B)
4
2SC45B
(C)
cccecscsscrseeseeeres
3
2SC458
(B)
ccccccssseseseceeee
2
SC971
(3)
(2)
...
2
2SC1211
(C)
(D)
vce
1
SILICON
DIODES
USED
10D1
(or
VO6B)
2
10DC-1
(BIK)
w.......
|
RD24A
(or
18339A)
wu...
1
10D1
3
10D2...
2
10D4
1
GERMANIUM
DIODES
USED
IN34A
_7
REEL
CAPACITY
:
5or7”
CARTRIDGE
AKAI
8-track
cartridge
(Lear
Jet
type)
POWER
CONSUMPTION
110W
(X-1810D
95W)
a
ee
8
ee
ll.
MEASURING
METHOD
TAPE
SPEED
DEVIATION
1.
Method
involving
use
of
pre-recorded
tape.
Playback
a
tape
pre-recorded
at
1,000
Hz
(£0.1%)
on
recorder
to
be
tested.
Connect
the
appropriate
output
to
a
frequency
counter
meter
in
order
to
measure
the
tape
speed
deviation.
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
timing
tape
stretch
or
contract
measurement
error
is
inevitable,
so
that
it
is
necessary
to
measure
the
total
length
of
the
tape
in
advance.
WOW
AND
FLUTTER
Playback
a
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
back
for
measurement
by
means
of
the
wow
meter.
In
this
case,
however,
the
wow
meter
indicates
a
value
as
much
as
twice
the
value
given
in
the
specifi-
cations.
SIGNAL
TO
NOISE
RATIO
X-1810
a
eS
Line
output
Set
the
Equalizer
Switch
to
“7-1/2”
ips
position
and
playback
a
tape
containing
a
250
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
recorder
and
measure
its
output.
Then
remove
the
tape
and
measure
the
noise
level
under
the
same
condition.
Convert
each
of
the
measured
values
into
decibels.
[V.T.V.M]
TOTAL
HARMONIC
DISTORTION
FACTOR
1
Ke/s
a
Oscillator
Meter
Connect
the
measuring
instrument
as
shown
above,
and
record
the
1,000
Hz
sine
wave
at
“0”
VU.
Playback
the
resultant
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
obtained
from
the
results
of
the
above
measurement
by
the
following
formula:
do=d—di
—d2
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.)
POWER
OUTPUT
Playback
a
tape
containing
a
sine
wave
of
250
Hz
recorded
at
“O”
VU
on
a
standard
recorder.
Measure
the
Voltage
at
the
output
of
the
recorder
to
be
tested
when
terminated
with
8
Q.
Then
use
the
following
formula:
E2
P
=
Desired
output
(W)
p=
E=
Measured
Voltage
(R.M.S.)
-
R=8Q
CROSS
TALK
(Cross
talk
between
the
tracks)
(TAPE)
Ree
PSS
|
2
nos
Tape
direction
“a
=
yy
Tape
direction
As
shown
in
the
figure,
first
record
a
1,000
Hz
sim
wave
on
track
No.
3
at
+3
VU
level.
Next,
remore
the
1,000
Hz
input
signal
and
record
under
a
nonimput
condition.
Then,
playback
the
tape
on
track
No.
3
and
No.
1
(reversed
condition
of
tape)
through
the
1,010
Hz
B.P.F.
(Band
Pass
Filter,
Sensitivity
.
..
1:1)
and
obtain
a
ratio
between
the
two
from
the
following
formuh:
C=201
ae
(db
=
O
:
E2
—E1
)
C
=Desired
crosstalk
ratio
(db)
Eo
=1,000
Hz
signal
output
level
(me
E2
=1,000
Hz
crosstalk
output
level
2277777)
E1
=No-input
signal
record
level
REERS
ac
3
FREQUENCY
RESPONSE
Audio
Oscillator
Connect
the
measuring
instrument
as
in
the
above
diagram,
and
measure
the
frequency
response
in
the
following
sequence:
RECORD
:
1)
Introduce
a
sine
wave
of
1,000
Hz
to
the
Line
In-
put
of
the
recorder
to
be
tested,
through
an
attenuator
from
an
audio
frequency
generator.
2)
Set
the
Record/Playback
Knob
in
to
“Rec”
posi-
tion
and
adjust
the
line
input
volume
so
that
the
VU
meter
needle
indicates
“0”
VU.
3)
Under
the
condition
described
in
(2),
lower
the
input
level
16
dB
(cartridge
20
dB)
by
means
of
the
attenuator.
4)
Record
the
spot
frequency
in
the
range
of
30
Hz
to
23,000
Hz
from
the
audio
frequency
generator.
PLAYBACK:
5)
Set
the
Record/Playback
Knob
to
“Play”
position.
6)
Set
the
Equalizer
to
7-1/2,
3-3/4,
or
1-7/8
ips
position.
7)
Connect
a
High
Sensitivity
V.T.V.M.
to
the
Line
output.
8)
Playback
the
tape
previously
recorded.
9)
Adjust
the
output
level
to
“0”
dbm
at
1,000
Hz
(indicated
on
range
selector
of
V.T.V.M.).
10)
Playback
the
recorded
spot
frequencies,
make
a
memo
of
output
level,
and
plot
the
value
on
a
graph.
(Note:
New
tape
of
particularly
good
quality
should
be
used
for
measurement
of
the
frequency
response.
AKAI
100F
tape
is
recommended).
ll.
CONTROL
LOCATIONS
Index
Counter
&
Reset
Button
Tape
Speed
Selector
Built-in
Speaker
‘X-1810
only}
~-Take-up
Reel
Table
Built-in
Reel
Retainer
Tape
Guide
Automatic
Shut-off
Lever
Playback/Record
Lever
Built-in
Speaker
-
‘X-1810
onty:
Supply
Reel
Table——
Built-in
Reel
Retainer---—
Cycle
Conversion
switch
‘A
Pinch
Wheel
Tape
Tension
Lever
&
Sensing
Pin
Capstan
—
Pause
Lever
Track
Selector
Start
Button
Sensing
Pin
——
-
-
Fast
Forward/Rewind
Lever
a
one
Automatic
Shut-off
Switch
Right
Channel
Volume
&
Tone
Control
_
Power
Switch
S.R.T.
Button
Manual}
Reverse
Buttons
Record
Safety
Button
Equalizer
Switch
Left
Channe!
Volume
&
Tone
Control
Left
VU
MEter
—Right
VU
Meter
Headphone
Jack
Speaker
Switch
Left
&
Right
Microphone
Jacks
---——Tieseees
Program
Selector
Button
a
Program
Indicator
Lamps
Mode
Selector
Switches
Remote
Coniro!
Socket
Cycle
Conversion
Switch
‘B}
;
Fuse
Post
&
Voltage
Selector
Speaker
Jacks
(Left/Right)
(Model
X-1810
only;
Output
Jacks
(Lift/
Right)
Input
Jacks
‘Lift/
Right}
Din
Jack
AC
Cord
saan
-Built-in
Speaker
©
X-1310
only:
Cartridge
Rcepotacle
Cartridge
Automatic
Stop
/Continuous
Pla
S
witch
IV.
DISMANTLING
OF
TAPE
TRANSPORT
UNIT
&
AMPLIFIERS
In
case
of
trouble,
etc.
necessitating
disassembly,
please
disassemble
in
the
order
shown
in
photographs.
Reas-
semble
in
reverse
order.
II
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GIGI
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glial
qu
qugugquguquququgugugigigvargigT7
OSS
RS
RS
ORS
STORE
ORS
RSIS
RSE
ARS
SRS
SY
RST
ORS
RS
ORS
ORS
RS
ORS
OAS
ORS
ORS
RST
ORS
RST
ORS
ORS
PRS
ORS
ORS
NSE
OS
RS
Og
OR
OE
OR
OE
ON
K
CASE
BLOCK
CONNECTION
PLUGS
MECHANISM
BLOC
band
AMPLIFIER
BLOCK
ECHANISM
PANEL
Le
-B
AO
a)
PEIGEGL
SD
™~
SES
ESOS
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BEBE
EEE
SOL
PE
EERE
EERE
EE
BE EE
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EEE
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EEE
EE
V.
TRANSPORT
MECHANISM
SWOO08b
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[wes
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NHS
at
|
eng
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<=
+
5
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we
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po203
00204
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at
SS
SS
IN34A
—
IN34A
SS
TRO201
TRO202
TRO203
TRO204
28€945(Q)(R)
28C945(0)(R)
2SCI2IIC)
25C458(C)
FWD.—>
REV,
ON
FORWARD
PLAY
OFF
ON
OFF
(AFTER
2
10
5
SEC,
OFF
REVERSE
PLAY
ON
OFF
ON
(AFTER
2.5
105
SEC,OFF)
Fig.
1
SYSTEM
CONTROL
CIRCUIT
1.
FORWARD
PLAY
(Recording)
(Pinch
Roller
Pressure
1.5
Kgr.
to
1.8
Kgr.)
When
Recording/Playback
Lever
is
set
to
PLAY
position,
the
Pinch
Roller
Presses
against
Capstan
to
move
the
tape
at
the
rated
speed.
The
Brake
Levers
free
the
Brake,
and
Lever
Spring
(G)
turns
“on”
Micro
SW
(SW
006
operation
switch).
System
control
TRO201
is
turned
“off”,
TRO202
“on”,
and
TRO203
&
TRO204
“off”.
About
a
60V
current
is
supplied
to
the
take-up
motor
and
about
30V
to
the
supply
motor,
so
that
the
torque
motors
become
operative.
(See
Fig.
2)
System
Control
and
Motor
Circuit
Block
Diagram
SW006
(OPERATION
SW.)
RO2i3.
D202
a-2
l2w
5K
10D4
~
Y
(sm)
Ei3
o
REV,
©
100V
HOV
q4
z
50Hz
60Hz
3
°
ace)
ee
[oe
ud
>
—
<
&
S|
&
MAIN
ris
>
Vas
‘
é
MOTOR
NI
in
Rg
nN
2
3
3
w
RWD.
=
Swe
—{><}-+-—
sotenoio
———*————-
NORMAL
CLOSED
CONTACT
———{]———
NORMAL
OPEN
CONTACT
Fig.2
FORWARD
PLAY
SUPPLY
VOLTAGE
OF
BOTH
TORQUE
MOTORS
DURING
RECORDING/PLAYBACK
‘SUPPLY
MOTOR
|
TAKE-UP
MOTOR
Forward
Play
30V
(50
to
70gr)
|}
60V
(210gr)
First
2.5
to
5
sec.
of
normal
or
47V
(100gr)
47TV
(100gr)
reverse
Reverse
Play
60V
(210gr)
|
30V
(50
to
70gr)
RWD.
or
F.
Fwd.
Fig.
3