Akai AT-S55/L

AT-S55/L
Unless
otherwise
specified,
use
the
adjustment
points
provided
on
the
Tuner
P.C
Board
(Fig.
5).
Remarks
ica a Result
em
1
Front-end
T1
(BLK)
Maximum
Noise
IF
Coil
-
(Front-end)
Level
broadcasting:
Centered
)
Center
T2-a
Tuning
Meter
and
TP3.
(See
Note
1)
Voltage tae
Indication
Notes:
Distortion
3 Factor a2%
BAND switch to FM, and MODE to MONO.
Turns only noise without interference from
Connect a Center Tuning Meter between TP2
Turns only noise without interference from
broadcasting.
Distortion Factor:
98MHz, 60dB, 1kHz (mono 100%) input.
Less
than
0.3%
Less
than
0.3%
in
both
channels.
ee
Connect
a
F
Counter
between
TP4
and
4
Runni
5
onnect
a
Frequency
Counter
between
an
F
oe
yee)
yophe
te
GND
on
the
Tuner
P.C
Board.
(See
Note
2)
requency
5
High
Range
TC1,TC2,TC3
|
Distortion
Factor:
|
MODE
switch
to
MONO.
Sensitivity
(Front-end)
Less
than
3%
108MHz,
Less
than
8dB,
1kHz
(mono)
input.
Confirmati
6
ae
lowiheie:
Distortion
Factor:
|
88MHz,
Less
than
8dB,
1kHz
(mono)
input.
Sensitivity
Less
than
3%
(See
Note
3,
4)
7
Pilot
Signal
T3
(BLK)
Mini
Baik
MODE
switch
to
STEREO.
Cancel
VR3
(100KB)
inimum
UUtput
|
98MHz,
60dB
(stereo),
Pilot
signal
only
input.
Stereo
‘
8
|
Separation
VRS
(22KB)
|
More
than
40dB
ne
Mites
oo.
ele
eal
ted
(Left
->
Right)
P
Stereo
Rais
9
Separation
VR6
(22KB)
More
than
40dB
98MHz,
60dB,
1kHz
(stereo
100%)
Rch
input.
(Right
>
Left)
Minimum
output
of
Lch.
Confirmati
98MHz,
60dB,
1kHz
(stereo
100%)
input.
10
|
of
ce
oe
Distortion
Factor
:
|
If
distortion
exceeds
0.5%,
first
check
accord-
Eee
Less
than
0.5%
|
ing
to
Steps
2,3,
4,
8
and
9,
and
then
readjust
tion
Factor
;
according
to
Step
1.
.
98MHz,
40dB
input.
11
nae
ae
VR2
(4.7K)
Adjust
VR2
to
a
point
where
Sth
LED
of
SIGNAL
SaSTvaty
LED
lights
up.
(See
Note
5)
MODE
switch
to
STEREO.
98MHz,
22dB,
1kHz
(mono
100%)
input.
Adjust
Muting
Level
VRi
(100K)
22dB
+
6dB
VR1
until
the
output
signal
is
reduced
to
zero.
Vary
the
SSG
output
by
+6dB
and
check
muting
operation.
1.
For
the
Center
Meter
should
be
used
the
tuning
meter
and
the
like
available
as
a
part
of
the
other
models.
2.
When
connecting
a
Frequency
Counter,
connect
from
TP
via
100
kohms
resistor.
(Refer
to
Fig.
10)
3.
When
the
specified
sensitivity
of
8dB
cannot
be
obtained
at
the
two
frequency
points,
88MHz
and
108MHz,
repeat
the
adjustment
as
described
in
Step
5.
4,
When
the
distortion
factor
of
sensitivity
still
does
not
comply
with
the
data
specifications,
adjust
by
tuming
the
Front-end
IF
Coil
core,
but
not
more
than
1/2
turn.
5.
The
5th
LED
lights
up
at
40dB
but
when
the
attenuator
is
decreased
2dB
it
is
extinguished.
15