Sharp SG-315H - TUNER ALIGNMENT INSTRUCTIONS; Tuner Alignment Procedure; FM FREQUENCY ADJUSTMENT; FM Band Frequency Calibration

ALIGNMENT INSTRUCTIONS (TUNER)
Alignment
is
an
exacting
procedure
and
should
be
undertaken
only
when
necessary.
If
alignment
of
AM
and
FM
is
required,
either
section
may
be
done
first.
The
FM
stereo
section,
however,
should
be
done
only
if
the
FM
monaural
section
is
properly
adjusted.
Notes: Don’t use a metallic screw driver.
REQUIRED EQUIPMENT:
1.
Signal
generator
with
a
frequency
range
of
140
kHz
to
18.5
MHz:
AM
2. Signal generator with a frequency range of 87.4 MHz to 109 MHz: FM
3. Signal generator with a frequency output of 10.7 MHz+0.5 MHz: FM
4. Vacuum tube voltmeter (AC-VTVM)
5.
Sweep
signal
generator
with
a
sweep
range
of
at
least
500
kHz
and
center
frequency
of
10.7
MHz
with
at
least
a
10.7
MHz
marker.
(Ext.
Marker
may
be
used.)
6. Oscilloscope with a wide range amplifier of approximately 100 kHz
7. Test loops, a coil of any size wire, one turn or more.
8. FM stereo signal generator.
9. Audio signal generator with a frequency of 20 Hz to 100 KHz.
Notes:
generator
output
at
the
lowest
level
that
will
maintain
a
usable
output
from
the
set,
except
for
FM
stereo
signal
generator.
Take
much
care,
lest
the
grounding
of
FM
sweep
signal
generator
input
should
make
multipaths
which
made
FM
IF
alignment
incorrect.
To
avoid
this
the
grounding
lead
may
be
connected
through
0.01—0.04
MFD
capacitor
to
the
tuner
chassis
when
sweep
generator
is
connected
to
the
tuner
section.
Allow the set at least five minutes to warm up before attempting alignment.
Generator modulation(AM) ...........-2 00002 eee eeee 30%, 400Hz
Generator modulation(FM)
Sede ee ok bet eee hac ace tes arenes 22.5kHz, 400 Hz
During alignment keep the signal
Generator
modulation(FM
stereo)
.............-2-02-0--
CH.L.
or
CH.R.
11.25kHz,
1000Hz
Mod.
THE INSTRUCTION OF FREQUENCY ADJUSTMENT
In order to comply with FTZ rule Nr. 358 S757,
please fix the low end of dial frequency (87.5 MHz)
and the high end of dial frequency (107.9 MHz) on
FM band, by adjusting oscillation coil (L104) and
oscillation trimmer (TC3), respectively, as illustrated
in Figure 9.
TCS
LIO4
Figure 9
AM ALIGNMENT
ALIGNMENT PROCEDURE (TUNER)
SIGNAL GENERATOR
rmogsDunt ve DIAL POINTER FUNCTION) WETER | apiusrent | REMARKS
NEMBER CONNECTION FREQUENCY
Thru
0.01
uF
to
Q201
|
455
kHz
High
end
of
MW
Oscilloscope
con-
|
T204
Adjust
i
ne
1
F
‘al
T205
imum
output.
OF)
base
as
small
as
possible
|
(Sweep)
Diai
nected
to
TP201
ae
Repeat
2
or
3
times
sh
4
|
y
Radiated
Signal
as
145
kHz
Low
end
of
LW
VTVM
connected
|
Oscillator
coil
Same
as
above
small
as
possible
Dial
to
TP201.
L205
Band
are
Ga
Coverage
|
Radiated
Signal
as
295
kHz
High
end
of
LW
Same
as
above
Oscillator
Same
as
above
3
:
F
3
small
as
possible
Dial
Trimmer
TC9
possible
4
Radiated
Signal
as
280
kHz
280
kHz
LW
Same
as
above
Antenna
Trimmer
|
Same
as
above
small
as
possible
TC6
Tracking
j—-
aa
Radiated
Signal
as
160
kHz
160
kHz
LW
Same
as
above
Antenna
coil
Same
as
above
5
small
as
possible
L202
(Bobbin
of
a4
LW)
6
Radiated
Signal
as
510
kHz
Low
end
of
MW
Same
as
above
|
Oscillator
coil
Same
as
above
small
as
possible
Modulated
Dial
L204
Band
7
Coverage
|
Radiated
Signal
as
1650
kHz
High
end
of
MW
Same
as
above
Oscillator
Same
as
above
small
as
possible
Modulated
Dial
Trimmer
TC8
8
Radiated
Signal
as
1400
kHz
1400
kHz
MW
"|
Same
as
above
Antenna
Trimmer
|
Same
as
above
small
as
possible
TCS
Tracking
——
Radiated
Signal
as
600
kHz
600
kHz
MW
Same
as
above
Antenna
coil
Same
as
above
9
small
as
possible
L202
(Bobbin
of
MW)
+—
Thru
1OPF
to
AM
EXT|
5.9
MHz
Low
end
of
SW
Same
as
above
Oscillator
coil
Same
as
above
10
ANT.
as
small
as
Dial
L203
Band
possible
lke:
Coverage
|
Thru
10PF
to
AM
EXT|
18.3
MHz
‘High
end
of
SW
7
Same
as
above
Oscillator
Same
as
above
11
ANT.
as
small
as
Dial.
Trimmer
TC7
12
13
Tracking
Thru
10PF
to
AM
EXT|
16
MHz
16
MHz
SW
Same
as
above
Antenna
Trimmer
|
Same
as
above
ANT.
as
small
as
TC4
possible
a
Thru
10PF
to
AM
EXT]
6.5
MHz
6.5
MHz
SW
Same
as
above
Antenna
coil
Same
as
above
ANT. as small as
possible
L201
SIGNAL OR
SWEEP GENERATOR
SWEEP GENERATOR
BASE OF
Q201
see equipment
item 7
RF IF
AMPLIFIER
OSCILLOSCOPE
GROUND
Figure 10 AM ALIGNMENT
EQUIPMENT CONNECTIONS