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Akai X-360D

Akai X-360D
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5.
RECORDING
EQUALIZATION
CHARACTERISTICS
ADJUSTMENT
a)
For
tape
and
meters,
follow
the
procedure
used
for
the
adjustment
of
the
recording
amplifier.
b)
Adjust
the
Recording
Level
Control
by
setting
the
Monitor
Switch
to
“SOURCE”
position
so
that
the
VU
meter
needle
indicates
“0”
(white
dot).
c)
Attenuate
the
Audio
Oscillator
signal
by
20
db.
d)
Start
the
tape,
by
pushing
the
Forward
Button
then
press
the
Record
Button
to
record.
The
Monitor
Switch
must
be
set
to
“TAPE”
position.
e)
As
shown
in
Fig.
3,
increase
the
frequency
of
the
Audio
Frequency
Oscillator
by
steps
from
1
KHz
to
10
KHz.
Adjust
Bias
Voltage
and
Bias
Head
angle
including
the
gap
between
Bias
and
Recording
heads.
.
The
V.T.V.M.
which
is
connected
to
the
Line
Output,
should
indicate
the
same
voltage
when
using
|
KHz
to
10
KHz.
f)
During
7-1/2”
operation,
the
Bias
Voltage
may
be
adjusted
by
turming
the
white
knob
VR30-1
(semi-fixed
resistor
2K—B)
of
Bias
Oscillator
Board
(RD-530)
clockwise.
This
adjustment
should
begin
when
VR30—1
is
fully
wound
in
the
clockwise
position.
g)
As
shown
in
Fig.
4,
Gaps
A
and
B,
which
are
between
the
Recording
and
Bias
Heads,
whould
be
about
0.2
mm.
h)
After
completion
of
the
foregoing,
observe
the
Recording
Playback
Output
Voltage
at
1
KHz
and
10
KHz.
If
this
voltage
remains
constant,
change
the
frequency
response
of
Audio
Oscillator
continuously.
Check
to
see
that
the
Output
Voltages
are
within
+
3
dB
at
any
condition
up
to
20
KHz.
If
the
response
around
20
KHz
reads
more
than
+
3
dB
difference
when
compared
with
response
at
10
KHz,
adjust
the
Peaking
Coil
.(AK1206)
of
the
Recording
Amplifier
to
match
the
High-range
response.
i)
If
the
frequency
response
is
gained
as
specified,
reset
the
Attenuator
Dial
to
read
“0”
VU.
Follow
the
operation
as
detailed
in
4
(e)
&
(f),
and
‘re-adjust
the
Recording
Level
of
the
Recoring
Amplifier
to
0
VU
at
1,000
Hz.
)
Set the
Tape
Speed
Selector
to
“3-3/4”
and
attenuate
the
Input
signal
to
—-20
dB.
Adjust
the
VR30-2
(semi-fixed
resistor
5
K—B)
of
Bias
Oscillator
Board
(RD—530)
so
that
the
responses
at
1
KHz
and
10
KHz
in
Recording/Playback
condition,
are
at
the
same
level.
After
the
same
response
at
1
KHz
and
10
KHz
has
been
gained,
increase
the
Input
signal
to
18
KHz
by
.
steps.
Check
whether
18
KHz
is
within
—6dB.
Distortion
level
at
7-1/2’
should
be
within
2%
and
3%
at
"3-3/4".
DM
DETECTOR
SENSITIVITY
ADJUSTMENT
Before
adjustment,
remove
the
solder
at
point
P
(Time
Delay
circuit
of
15
seconds)
which
is
shown
’
in
Figs.
5
and
6.
Turn
the
Microphone
Record
Level
Control
(left
channel)
slightly
clockwise
from
the
medium
level
position.
Then,
record
the
non-input
signal
for
15
seconds.
Playback
that
signal.
Adjust
VR71-1
(semi-fixed
resistor
10
K—B)
of
DM
Detector
Card
so
that
DM
indicator
lamp
is
extinguished.
Playback
a
new
blank
tape.
Adjust
VR71-1
so
that
the
Indicator
lamp
lights.
Check
to
see
that
the
lamp
is
lighted
when
the
tape
is
off the
Playback
Head
during
playback
operation.
Solder
Point
P
as
shown
in
Figs.
5
and
6.
After
soldering,
the
DM
Indicator
Lamp
should
light
after
15
seconds
following
the
stoppage
of
input
signal
to
the
DM
Detector
circuit.
TR7i-!
TR7I-2
TR7i-3 TR7I-4
2SC650(B)
2SC650(B)
2SC458LG(B)
2SC458L6(B)
im
c7i-2)
Bn
0.022/s0
£
wc?!-i2
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er
6
VRT7I“I10KB
TR7I-5
2SC458(B)
2SC372
2SC372
2SC372
2SC372
.
TR7I-6
TR7I-7
TR7!-8
TR7I-9
O7I-2
INS4A
CTIWIS
33/318
C76
1000/3.15
CHI?
=a
RD-271
DM
DETECTOR
CARD
l
11

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