Akai X-1810 User manual
X<=-1810
ALSO
APPLCABLE
TO
MODEL
X-1810D
MODEL
Il.
Wi,
IV.
VI.
Vil.
VIL.
IX.
ia
TABLE
OF
CONTENTS
SPECIFICATIONS
......
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2
MEASURING
METHOD
........
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3
CONTROL
LOCATIONS
.......
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5
DISMANTLING
OF
TAPE
TRANSPORT
UNIT
&
AMPLIFIERS
2...
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6
TRANSPORT
MECHANISM
..
2.0...
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8
MECHANISM
ADJUSTMENT...........-.-0--006-
15
AMPLIFIER
ADJUSTMENT
...........
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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.
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PRS
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OR
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ON
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CONNECTION
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MECHANISM
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BLOCK
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PANEL
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TRANSPORT
MECHANISM
SWOO08b
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|
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<=
+
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N
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we
S¥
po203
00204
S¥
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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
2.
FROM
FORWARD
PLAY
TO
REVERSE
PLAY
At
Playback
Mode,
if
Reverse
Button
(B)
is
depressed
or
the
Sensing
Tape
passes
the
Sensing
Pole
(S1),
the
base
of
TRO202
is
grounded.
The
operation
of
TRO202
is
turned
off
and
the
voltage
is
sent
to
the
base
of
TRO203
and
operates
it.
Reverse
Relay
RLO201
is
activated
and
reverse
is
effected.
Because
RL201
is
turned
‘‘on”,
about
a
60V
current
is
supplied
to
the
left
motor
and
about
30V
to
the
right
motor
(Refer
to
Figs.
3
and
5).
At
the
same
time,
the
charge
current
flows
to
C0205
(100/16)
and
is
supplied
to
the
base
of
TR204,
and
TR204
is
turned
“on”.
Complete
charging
of
C0205
(100/16)
takes
only
about
2.5
to
5
seconds,
supplying
110V
to
the
main
motor
(See
RLO202-e-1).
A
voltage
of
about
47
volts
is
supplied
to
the
supply
and
take-up
motors
respectively
(See
RLO202-f-2)
and
the
mute
relay
(See
RLO202
g-4,
h-3)
works
to
mute
the
playback
out-
put
signal.
After
2.5
to
5
sec.
TRO204
is
turned
“off”,
and
also
RLO202
is
turned
“off”.
At
the
same
time,
a
discharge
current
of
C0206
(100/160)
momentarily
flows
and
about
a
140V
current
is
supplied
to
the
Reverse
Plunger.
Upon
completion
of
discharge
of
C0206,
about
a
35V
current
becomes
constant,
and
a
lowered
playback
head
position
is
maintained.
PLAYBACK
/
RECORDING
/
REVERSE
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SW.)
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12w
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=
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Hz
et
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AIN
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Fig.
5
3.
FROM
REVERSE
TO
FORWARD
PLAY
During
Reverse
Playback,
if
manual
reverse
Forward
Button
“A”
is
depressed
or
the
sensing
tape
passes
the
sensing
pole
“S2”
the
base
of
TRO201
is
grounded,
TRO201
is
turned
“off”,
voltage
is
supplied
to
the
base
of
TRO202,
TRO202
is
turned
“on”,
and
TRO203
is
turned
“off”.
RL201
is
“off”,
a-2
is
turned
“off”
and
the
flow
of
voltage
to
the
Reverse
Plunger
is
cut,
the
Recording
Playback
Head
is
raised
to
upper
position,
a
voltage
of
30V
is
supplied
to
the
left
motor,
and
about
60V
to
the
right
motor
(Refer
to
Figs.
1,
2,
and
3).
TRO204
is
turned
on
within
275
to
5
seconds,
supplying
110V
to
the
main
motor
(See
RLO202
e-1).
47V
is
supplied
to
the
Supply
and
Take-Up
Motors
respectively
and
the
Mute
Relay
(See
RLO202
h-3)
works
to
mute
the
playback
output
signal.
_
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4.
FAST
FORWARD
When
Fast
Forward/Rewind
Lever
is
set
to
‘‘F.
Fwd”,
Lever
Spring
““G”
turns
on
SWO06
Operation
Switch
F
(Micro
Sw)
and
Brake
Levers
(E)
(E’)
free
Brake.
Further,
SW-3
(Slide
Switch)
is
turned
‘on’,
a
100V
current
is
supplied
to
the
Take-Up
Motor
and
the
Take-
Up
Motor
rotates.
(Refer
to
Fig.
7).
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HEAD
REVERSE
PLUNGER
—
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FORWARD
/
REWIND
Fig.
6
5.
REWIND
When
Fast
Forward/Rewind
Lever
is
set
to
“RWD”,
Lever
Spring
““G”
turns
on
SWOO6
Operation
Switch
(Micro
Sw)
and
Brake
Levers
(E)
(E’)
free
Brake.
Further
SW-2
(Slide
Switch)
is
turned
“on”,
2
100V
current
is
supplied
to
the
Supply
Motor
and
the
Supply
Motor
rotates.
(Refer
to
Fig.
8).
SwOO06
RO2I
00202
0-2
Bw
isk
1004
Hy
o
|
ee
e
Gm)
Ef,
8
10
LLOV
es
s
SOHz
S0Hz
«
3
=
MAIN
a
of
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e-|
FA
Cie
MOTOR
is
3
d4
<
wl
Fwd,
=x
swe
4
4
Fig.
8
1]
6.
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.
9
to
12)
7.
RECORD/PLAYBACK
CHANGING
MECHANISM
When
REC/PLAYBACK
LEVER
(N)
is
turned
to
REC
position,
CAM
(a)
pushes
Recording
Levers
(b),
(c),
and
(d)
as
illustrated
by
the
dotted
lines
in
Fig.
13.
Then
the
RECORD/PLAYBACK
CHANGE
SWITCHES
SW4-1
and
SW2-1
a,
b
assume
recording
position.
lf
Levers
(b)
and
(c)
do
not
move
Lever
(d)
properly,
SW4-1
and
SW2-1
a,
b,
do
not
operate
properly,
abnormal
oscillation
may
occur.
Also
the
inability
to
record
may
occur.
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8.
CARTRIDGE
AUTOMATIC
STOP
OPERATING
PRINCIPLES
(See
Fig.
14)
When
Cartridge
Auto
Stop/Cont.
Play
Switch
(SW-4)
is
set
to
“Auto
Stop”,
when
the
Program
Selector
comes
to
Program
“4”
position,
the
voltage
passes
through
Program
Selector
and
Relay
(RLS-1)
(1)
and
voltage
is
applied
to
D5-1
and
RLS-1
as
shown
in
Fig.
14,
point
“A”
is
grounded
by
the
Program
Selector
or
Sensing
Tape,
RL5-1
is
activated,
and
the
motor
stops.
At
the
same
time,
Solenoid
Coil
SL5-1
is
also
activated
and
Program
Selector
is
returned
to
Program
1
position.
Relay
RL-1
is
held
by
the
voltage
supply
from
P15
(16)
Multi-Jack
which
passes
RL-1.
In
order
to
return
to
normal
mode
after
Cartridge
Automatic
Stop
has
been
effected,
the
voltage
supply
to
RL5-1
must
be
cut.
When
this
is
done,
SW-4
(Automatic
Stop/Continuous
Play
Switch)
returns
to
“Cont
Play”.
This
can
also
be
accomplished
by
turning
the
Power’
Switch
ON-OFF-ON.
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JACK
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PROGRAM
SELECTOR
SW.
14
Vi.
SLIDE
SWITCH
ADJUSTING
SCREW
HEAD
HEIGHT
ADJUSTMENT
(See
Figs.
1
and
2)
Recording
Playback
Head
During
normal
(Forward)
play,
adjust
Screws
(a)
and
(b)
so
that
the
upper
edge
of
the
Rec/Playback
Head’s
upper
core
is
the
same
height
as
the
upper
edge
of
the
tape.
During
reverse
play,
adjust
Screw
(d)
so
that
the
lower
edge
of
the
Rec./Playback
Head’s
lower
core
is
the
same
height
as
the
lower
edge
of
the
tape.
Erasing
Head
Adjust
screw
(e)
so
that
the
upper
edge
of
the
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.
ADJUSTMENT
OF
AZIMUTH
ALIGNMENT
Playback/Rec
Head
(See
Fig.
1,
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)
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.
MECHANISM
ADJUSTMENT
Fig.
1
Fig.
2
f=g=0.2mm~0.3mm
Fig.
3
Fig.
4
Clearance
of
the
Bias
Head
(See
Fig.
3,
4)
Unfasten
two
screws
and
move
the
Bias
Head
by
hand
until
the
clearance
(f)
and
(g)
reachs
O.2
to
0.3
mm.
Then
fasten
screws.
Note:
If
the
clearance
(f)
and
(g)
becomes
less
than
0.2
to
0.3
mm,
the
Frequency
Chwarac-
teristic
will
be
too
low,
but
Distoriiora
will
decrease.
If
the
clearance
(f)
and
(g)
becomes
more
than
0.2
to
0.3
am.
the
Frequency
Characteristic
will
be
tio
high,
but
Distortion
will
increase.
Fig.
6
16
3.
HEAD
ADJUSTMENT
(CARTRIDGE)
(PART
I)
3-1.
Adjustment
of
azimuth
alignment
(See
Fig.
5)
Playback
an
azimuth
alignment
Test
Tape
(8,000
Hz
recorded
tape)
and
set
the
azimuth
alignment
of
head
assembly
by
turning
screw
(c’)
until
maximum
playback
output
of
program
2
or
3
is
obtained.
3-2.
Height
adjustment
(See
Fig.
5)
A.
Playback
*a
test
tape
and
turn
screw
(d).
until
maximum
gain
of
program
1
is
ob-
tained.
B.
Set
*a
blank
test
tape
to
recorder,
make
a
recording,
and
then
make
an
erasing
test.
If
erasing
is
not
complete,
adjust
as
follows:
(1)
Turn
screws
(a)
and
(b)
clockwise
simultaneously
forty-five
degrees
and
then
make
erasing
test
again.
Note:
The
blank
test
tape
should
be
demagnetized
every
time
an
eras-
ing
test
is
made.
(I)
If
the
erasing
is
not
complete
after
the
above
adjustment,
turn
screws
(a)
and
(b)
clockwise
again
ten
to
fifteen
degrees
simultaneously.
(Ill)
If
erasing
is
still
not
complete,
repeat
step
2)
until
complete
erasure
is
accomplished.
Playback
Azimuth
Alignment
test
tape
again
and
turn
screw
(c’)
until
maximum
program
gain
of
program
2
or
3
is
obtained.
(IV)
Playback
test
tape
again
and
turn
Screw
(d)
until
maximum
gain
of
pro-
gram
1
is
obtained.
*TEST
TAPE
This
test
tape
is
specially
designed
by
AKAI
for
Height
Adjustment
tests.
Program):
citation
nee
ated
tecdaee
Rika
1,000
Hz
Proprany:
2:
..cc045
tance
dt
acon
Se
Ginna
Seca
lonae-
3
Blank
PrOpramy-3,.¢
tec
csas224
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festhon
attic
bale
Gee
Sarees
1,000
Hz
PLOBTAN
A
core
cb
dase
eackeetee
wie
dab
ace
Baek
s
3,000
Hz
*BLANK
TEST
TAPE
This
is
also
a
special
tape
designed
by
AKAI.
Duration
of
tape
is
only
15
seconds.
4.
HEAD
ADJUSTMENT
(CARTRIDGE)
(PART
ID)
If
head
adjustment
as
outlined
in
PART
I
is
difficult
to
perform,
separate
head
block
from
unit.
Cut
and
thread
a
short
piece
of
tape
by
hand
and
adjust
as
shown
in
Fig.
7.
4-1.
ADJUSTMENT
OF
HEAD
HEIGHT
(See
Figs.
6)
A.
Erase
Head
Adjust
the
Erase
Head
Height
by
turning
head
height
screw
(d)
so
that
the
upper
edge
of
the
tape
as
it
passes
the
erase
head
is
0.0625
to
0.075
mm
below
the
top
edge
of
Program
|
head
core.
B.
PLAYBACK
HEAD
Adjust
the
Playback
Head
Height
by
turning
;
head
height
screws
(a)
and
(b)
in
the
same
i
manner
so
that
the
upper
edge
of
the
tape
as
it
passes
the
playback
head
is
exactly
parallel
with
Program
1
playback
head
core.
C.
After
adjustments
(A)
and
(B)
have
been
completed,
switch
Program
Selector
to
Pro-
gram
4
and
confirm
that
position
of
tape
is
as
shown
in
Fig.
7
(b).
If
position
differs
from
Fig.
7
(b),
carry
out
adjustments
described
in(A)
and
(B)
again.
4-2.
ADJUSTMENT
OF
AZIMUTH
ALIGNMENT
After(A),(B)
and
(C)of
Head
Adjustment
(Part
II)
has
been
completed,
reassemble
head
block
(put
back
in
unit)
and
carry
out
Azimuth
Alignment
as
outlined
in
Head
Adjustment
Part
I,
Item
1-1.
$612
Fig.
7
(a)
Progam
0
+
0.025mm
0.0625mm
~
0.075mm
RH.
/
ow
J
lex
_J
Fig.
7
(b)
Progam
“4”
17
Fig.
8
5.
BRAKE
TENSION
ADJUSTMENT
(See
Fig.
8)
For
Brake
Tension
Measurement,
use
a
60
mm
tape
wound
ona
5”
reel
and
measure
with
a
Tension
Gauge.
Standard
tension
is
280
to
330
grams.
Adjust
Brake
Tension
by
changing
position
of
suspended
springs
(S
1
and
S
2
in
Fig.
8),
loosening
screws
(A)
and
(B)
and
changing
position
of
spring
suspension
metal
(C),
or
loosening
screws
(D)
(E)
and
changing
position
of
F.
Caution:
Following
Brake
Adjustment,
confirm
that
the
Brake
Band
does
not
touch
the
cloth
tape
on
brake
drum.
(See
Fig.
10)
18
6.
REEL
HEIGHT
ADJUSTMENT
(SEE
DIAGRAM
ILLUSTRATION)
Loosen
Reel
Table
Screws
and
regulate
height.
ee
EL
ul
Wo
PRLLZZIIZLILL
ITT
LT
aL
LaLa
NA
ePID
7
—
ers
Nd
Wo,
TIAL
Tt
REEL
TABLE
ADJUSTING
SCRE’
BRAKE
TENSION
ADJUSTING
SCREW
Fig.
10
19
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