Technics SA-5270 - Alignment Instructions... FM and AM Tuner Circuit

gw ALIGNMENT INSTRUCTIONS ... FM AND AM TUNER CIRCUIT
NOTE For adjustment, proceed with the bottom board attached as it is.
Notes:
41.
Selector
switch
.......-..--0----05-
AM
(AM
Alignment)
®5-
Speakers
switch...
......2.000...
MAIN
and
REMOTE
to
ON
FM (FM Alignment) 6) Volume control: ss 8.ehsc3 oe espe 8 Variable
2.
FM
Muting/mode
switch
........
on/FM
auto
7.
Output
of
signal
generator
should
be
no
higher
than
necessary
3.
Maintain
line
voltage
at
rated
voltage.
to
obtain
an
output
reading.
4. Tape monitor switch. .........-.--. Source 8. 3009 FM dummy antenna..... Refer to fig. 7.
+
AM/FM
SIGNAL
GENERATOR
DIAL
INDICATOR
ADJUSTMENT
{VTVM or SCOPE) POINTS REMARKS
connection _|FReauency, SETTING | (pisTORTION METER)
AM ALIGNMENT
AM signal generator high ] 455kHz
1]
side
through
0.001/F
to
(30%
Mod.
.
Connect
VTVM
or
scope
i
;
AM
antenna
trimmer
with
400Hz)
Cone
to
speaker
terminal(L
or
R)
toe
ey
ae
oes
un
terminal.
[Set
for
England
or
TP201
of
set.
‘
to
470kHz}
al
Fashion
loop
of
several
600kHz
Connect
VTVM
or
scope
;
Adjust
for
maximum
turns
of
wire
and
radiate
{30%
Mod.
600kHz
to
speaker
terminal(L
or
R)
L202
(OSC
Coil)
output.
Adjust
L201
or TP201 of set. L201 {ANT Coil) by moving coil bobbin
signal into loop of receiver | with 400Hz)
along ferrite core.
Fashion
loop
of
several
1500kHz
Connect
VTVM
or
scope
CTS
(OSC
Trimmer)
Adjust
for
maximum
3]
turns
of
wire
and
radiate
(30%
Mod.
1500kHz
10
speaker
terminal
(L
or
R)
CT4
(ANT
Trimmer)
output.
signal
into
loop
of
receiver.|
with
400Hz)
or
TP201
of
set.
Repeat
steps
(2)
and
(3).
FM IF ALIGNMENT
f
ptt
Adjust
for
center
of
!
Point
of
non-
:
T1071
(Discri
1FT)
:
sai
4
No
signal
|
FM
Tuning
meter
of
set
Primary
[A]
tuning
meter
indi-
inter-ference
t
cation.
FM RF ALIGNMENT
Connect
FM
signal
gene-
90MHz
c
F
‘
connect
VTVM
or
scope
L6
(OSC
Coil)
;
.
ee
en
la
{100%
Mod.
9OMHz
to
speaker
terminal(L
or
R)
L4
(DET
Coil)
oun
for
maximum
Aumayanteaie
with
400Hz)
or
TP101
of
set.
L1
(ANT
Coil)
aa
ra
SE
Oe
a
pee
Pore
06
eee
ane
106MHz
Connect
VTVM
or
scope
CT3
(OSC
Trimmer)
Adjust
for
maximum
6
terminals
through
FM
(100%
Mod.
106MHz
to
speaker
terminal(L
or
R)
CT2
(DET
Trimmer)
output.
Repeat
9
with
400Hz)
or
TP101
of
set.
CT1
(ANT
Trimmer)
steps
(5)
and
(6).
dummy antenna.
FM MONO DISTORTION ALIGNMENT
Connect
FM
signal
gene-
;
:
Tuning
at
1OOMHz
7
|rator
to
3002
FM
antenna
Toe
kia
datas
te
eee
T101
(Discri
IFT)
and
adjust
for
mini-
terminals
through
FM
with
‘400Kz)
heeeinel
et
ot
pea
Secondary
[B]
mum
distortion.
dummy
antenna.
:
Repeat
steps
(4)
and
(7).
FM SIGNAL METER ALIGNMENT
Connect
FM
signal
gene-
FM
Muting/Mode
switch
F
rator
to
300
2
FM
antenna
|
1QQMHz
to
“off/FM
mono”.
terminals through (100% Mod. 100MHz Signal meter of set. VR102 Adjust VR102 to
es
a
ore
Abs
A
with
400Hz)
about
‘4.7’
on
signal
t
mM
:
pply meter scale.
FM MUTING LEVEL ALIGNMENT
Connect
FM
signal
gene-
F
rator
to
3002
FM
antenna
}
i
q9MHz
Connect
VTVM
or
FM
Maal
eual
aie
9|
terminals
through
v4
100MHz
scope
to
speaker
(L
or
R)
Switehtono8
FM
dummy
antenna.
{100%
ee
terminal
of
set
VBIOF
SUtO:
Apply
16dB
(6.34V)to
set.
with
400Hz)
:
Adjust
so
that
outptt
can be obtained.
ISG indication are 28dB(IHF)
FM MPX PILOT ALIGNMENT
Using
a
frequency
counter
Using
alternate
system
1.
Apply
stereo
signal
from
generator
or
stereo
station
to
receiver.
S8MHz Non-modulated mono signal applied to set.
1.
10
2.
FM
Muting/Mode
switch
to
‘‘on/FM
auto”.
2.
Adjust
VR301
until
stereo
indicator
lights
up.
3.
Connect
frequency
counter
to
TP301
through
resistor
(100
kQ).
Cement
arm
of
VR301
as
shown
in
fig.
8.
4 Adjust VR301 to 19kHz +30Hz.
STEREO SEPARATION ALIGNMENT |
Notes:
1.
Stereo
modulator
........-..
*
Connect
stereo
modulator
output
to
EXT.
MOD.
terminal
of
signal
generator.
«Interna!
OSC
.....
1KHz
*Pilot
signal
modulation
..........
10%
2.
FM
signal
generator..........
+
Frequency
approximately
100MHz.
+Output
level
to
72dB
(IHF)
«Modulation mode to FM
3.
Band
selector
switch
.........
FM
4.
FM
Muting/mode
switch......-...--.
on/FM
auto
FM
SIGNAL
GENERATOR
STEREO
MODULATOR
INDICATOR
ADJUSTMENT
REMARK
(VTVM or SCOPE) POINT
Connect VTVM or scope to
output terminals through low pass
filter. Refer to fig. 9.
MODE AND MOD. RATE
CONNECTION
Adjust for minimum
right (and left) outpur
L (and R)
30% Modulation
"1 300 FM antenna terminals VR302
through FM dummy antenna
c 1
i 1
i
|
1259
|
rene
ToSG
|
750
|
To
Receiver
To
Receiver
|
Iv
3%,
Output
(SG
imp.
752)
!
Mieter
p | ' |
1500
!
1K
|
VR301 t i
bo.
4
A~B,
D—E:
Stereo
OFF
Position.
Mae
yt
,
3002
FM
Dummy
Antenna
B-D:
Stereo
ON
Position
(Indicator
Lighting).
LOW
PASS
FILTER
Cc: Adjust Point of Pilot Circuit
(fe = 15kHz ~19kHz)
ig. 7 (Abb. 7 7
Fig.
7
(
)
Fig.
8
(Abb.
8)
Fig.
9
(Abb.
9)
[6] SA-5270