EasyManuals Logo

Akai 4400D Service Manual

Akai 4400D
34 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #4 background imageLoading...
Page #4 background image
ll.
MEASURING
METHOD
1.
TAPE
SPEED
DEVIATION
3,
FREQUENCY
RESPONSE
i
440
4400
Frequency
Aig
ara
ae
0
Line
output
counter
requency
put
A
L
input
Line
input
Oscillator
output
Fig.
1
‘As
shown
in
Fig.
1,
connect
a
Frequency
Counter
to
the
Line’
Output
of
Model
4400.
Take
a
frequency
counter
reading
at
the
beginning,
middle,
and end
of
tape
winding
during
playback,
The
maximum
value
of
these
respective
readings
will
represent
tape
specd
deviation.
2.
WOW
AND
FLUTTER
4400
Line
output
Wow
and
Flutter
Meter
input
Method
A
As
stiown
in
Fig.
2,
connect
the
Line
Output
of
Model
4400
to
the
Input
of
a
Wow
and
Plutter
Meter.
Use
a
3,000
Hz
pre-recorded
test
tape
and
take
a
wow
and
flutter
meter
reading
at
the
begin-
ning,
middle,
and
end
of
tape
winding.
The
maximum
value
of
these
respective
readings
will
represent
the
wow
and
flutter.
Method
B
Supply
a
3,000
Hz
sine
wave
signal
from
an
Audio
Frequency
Oscillator
and
make
a
recording
on
a
blank
tape
at
the
beginning,
middle,
and
end
of
tape
winding.
Rewind
and
Playback
tape.
Measure
wow
and
flutter
with
a
Wow
and
Flutter
Meter.
{The
wow
and
flutter
value
of
Method B
will
be
close
to
twice
that
of
Method
A.)
High
Sensitivity
V.T.V.M,
Fig.
3
For
measuring
frequency
response,
connect
instru-
ments
as
shown
in
Fig.
3
and
proceed
as
follows:
1)
Supply
a
1,000
Hz
sine
wave
to
the
Line
Input
of
Model
4400
from
an
Audio
Frequency
Oscil-
lator
through
an
Attenuator.
Set
recorder
to
re-
cording
mode
and
turn
recording
level
volume
control
to
maximum.
Adjust
Attenuator
to
obtain
a
+4
dB
V.T.V.M.
reading.
2)
Under
conditions
described
in
1)
above,
re-adjust
Attenuator
so
that
the
Line
Output
is
—}@
dB,
and
record
40
to
‘20,000
Hz
spot
frequencies.
3)
Rewind
tape
and
playback
from
the
beginning.
Take
V.T.V.M.
spot
frequency
readings
and
plot
values
on
a
graph.
NOTE:
When
measuring
frequency
response,
new
tape
should
be
used.
4,
SIGNAL
TO
NOJSE
RATIO
aaa
|
4400
Line
output
High
Sensitivity
V.T.V.M.
Fig.
4
As
shown
in
Fig.
4,
connect
a
High
Sensitivity
V.T.V.M.
to
the
Line
output
of
Model
4400.
Play-
back
a
250
Hz
“0”
VU
pre-recorded
test
tape
and
measure
the
output.
Then
remove
the
tape
and
measure
the
noise
level
under
the
same
condition.
Convert
cach
of
the
measured
values
into
decibels.

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Akai 4400D and is the answer not in the manual?

Akai 4400D Specifications

General IconGeneral
BrandAkai
Model4400D
CategoryTape Deck
LanguageEnglish

Related product manuals