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Pioneer SX-1080 Service Manual

Pioneer SX-1080
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9.2
FM
TUNER
■
Confirm
that
the
dial
is
set
to
te
start
point.
■
Connect
as
shown
in
Fig.
10,
and
set
the
FUNC¬
TION
switch
to
“FM”
and
the
MUTING
switch
to
“OFF”.
1.
Set
an
FM
signal
generator
to
400Hz,
100%
modulation
66
dB
output.
2.
Set
TC
4
to
near
center
capacitance,
set
the
FM
signal
generator
and
the
SX-1080
dial
pointer
to
90MHz,
and
adjust
T
4
for
maximum
deflec¬
tion
at
the
signal
meter.
3.
Under
the
state
of
“2’’above,
adjust
the
primary
(bottom)
core
of
Te
so
that
the
pointer
of
the
tuning
meter
deflects
to
the
center
of
the
scale.
4.
Set
the
FM
signal
generator
output
to
15dB,
and
adjust
Tj
,
T^,
T
3
for
maximum
output.
5.
Set
the
FM
signal
generator
and
the
SX-1080
dial
pointer
to
106MHz,
and
adjust
TC
4
for
maximum
deflection
at
the
signal
meter.
(Make
the
FM
signal
generator
output
lOdB).
6
.
Set
the
FM
signal
generator
output
to
15dB,
and
adjust
TCi,
TC
2
,
TC
3
for
maximum
out¬
put.
7.
Repeat
steps
2
■
6
until
reception
at
90MHz
and
106MHz
is
perfect.
At
this
time,
adjust
T
5
for
maximum
output.
8
.
Adjust
the
primary
core
(bottom)
of
Tg
so
that
the
pointer
of
the
tuning
meter
deflects
to
the
center
of
the
scale
in
the
untuned
state
(noise
only).
9.
Set
the
FM
signal
generator
output
to
66
dB,
set
the
SX-1080
dial
fJointer
to
98MH2,
and
tune
the
FM
signal
generator
at
the
tuning
meter.
(Pointer
of
tuning
meter
deflects
to
the
center
of
the
scale).
10.
Adjust
the
secondary
side
(top)
of
Te
for
minimum
distortion.
11.
Repeat
steps
8-10
until
the
minimum
distor¬
tion
point
does
not
change.
12.
Set
the
FM
signal
generator
output
tolOOdB,
and
adjust
VR
2
for
maximum
deflection
at
the
signal
meter
(Fig.
11).
13.
Set
the
FM
signal
generator
output
to
26
dB.
Set
the
MUTING
switch
to
“ON”
and
adjust
VRl
so
that
the
output
waveform
disappears.
Fig.
11
Meter
deflection
S4
Fig.
10
Connection
of
FM
tracking
adjustment

Table of Contents

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Pioneer SX-1080 Specifications

General IconGeneral
Total Harmonic Distortion0.1% (at rated power)
Tuning RangeFM, MW
Damping Factor30
Input Sensitivity2.5mV (MM), 150mV (line)
Output150mV (line), 1V (Pre out)
Speaker Load Impedance4Ω to 16Ω
Frequency Response5Hz to 100kHz
Signal to Noise Ratio90dB (line)
Semiconductors4 x FET, 6 x IC
Power Output120 watts per channel (8 ohms, 20Hz-20kHz)

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