Sanyo M9930K - Tuner Adjustment Procedures; MW and FM Tuner Adjustments; SW1 Tuner Alignment

TUNER
ADJUSTMENT
MW
ADJUSTMENT
Adjusting
-
Sega
VTVM
swe
|
Scheu?
[apa
Oot
xsl
aaa
RU
acca
Connect
sweep
455
KHz
Low
end
of
dial
scale.
1.F.T.
generator
to
(400
Hz
30%
At
position
of
1304305
MAX.
Test
Loop.
modulation)
unrequired
signai.
T306
505 KHz
{400 Hz 30%
Connect AM SG to
Test Loop.
Connect oscilloscope
to EXT. SP terminals
Low end of dial scale
Connect
VTVM
to
modulation)
speaker terminals.
1650 KHz
(400 Hz 30%
modulation)
High end of diai scale
600 KHz
(400 Hz 30%
modulation)
600 KHz on dial scale
Connect AM SG to
Test Loop.
Connect VTVM to
speaker terminals.
1400 KHz
(400 Hz 30%
modulation}
1400 KHz on dial scale
Repeat adjustments.
PREPARE:
1.
Set
the
dial
pointer
to
very
left
line
of
diai
scale.
3.
Selector
switch
to
“MW”.
2.
Connect
sweep
generator,
AM
SG,
VTVM
and
oscilloscope.
4.
Use
a
screwdriver
with
plastic
grip
for
all
adjustments.
Connections
.
;
VTVM
Duigut
SG
frequency
Position
of
tuning
dial
|
Adjustment
Oscilloscope
Set center
T301,T302 position
Near max. capacity of of ceramic
VC. at positon with
unrequired signal.
FM ADJUSTMENT
Adjusting
LF, Connect sweep
generator to
Test point.
2 Ratio Det.
L104-1,2
TP1(H), TP2{E)
3
OSC.
4
PREPARE:
1.
Set
the
dial
pointer
to
very
left
line
of
dial
scale.
3.
Use
a
screwdriver
with
plastic
grip
for
all
adjustments.
2.
Connect
sweep
generator,
FM
SG,
VTVM
and
4,
Set
center
position
of
ceramic
filter.
oscilloscope.
FM
antenna
input
impedance
is
75
ohm.
SW1 ALIGNMENT
Connect oscilloscope to
TP3 (H),
Shield case (E).
10.7 MHz
(O%
modulation)
Connect oscilloscope to
R317(H),
Shield case {E).
87MHz
(400Hz 30%
modulation}
Low end of dial scale
Connect FM SG, to
Test point
TP1 (H), TP2 (E).
Connect VTVM to
speaker terminal.
109 MHz
(400 Hz 30%
modulation)
High end of dial scale
90MHz
(400Hz 30%
modulation)
90 MHz on dial scale
Connect FM SG. to
Test point.
TP1 (H), TP2 (E).
Connect VTVM to
speaker terminal.
106 MHz
(400 Hz 30%
modulation)
106 MHz on dial scale
VTVM
Oscilloscope
Adjusting
circuit
SG frequency Position of tuning dial
Connect
AM
SG.
2.15
MHz
.
$m)
*
Connect
AM
SG.
(400
Hz
30%
Low
end
of
dial
scale.
Connect VTVM to
EXT. SP. terminals.
to ANT terminal
through IRE
Test Loop.
modulation)
7.3 MHz
(400 Hz 30%
modulation)
High end of dial scale.
2.5 MHz
(400 Hz 30%
modulation)
2.5 MHz on Gial scate.
Connect AM SG.
to ANT terminal
Connect VTVM to
through IRE EXT. SP. terminals.
Test
Loop
6.5
MHz
(400
Hz
30%
6.5
MHz
on
dial
scale.
CT4
modulation)
a Repeat adjustments.
PREPARE:
1.
Set
the
Fine
turing
to
mechanical
center
at
cover
adjust.
3.
Use
screwdriver
with
plastic
for
all
adjustments.
2.
Set
the
dial
pointer
to
very
left
line
dial
scale.
4.
Selector
switch
to
“SW1".
=