Sansui TU-666 - FM Tuner Alignment

a
ALIGNMENT PROCEDURE
FM TUNER
FEED
DIAL ADJUST
STEP
ALIGN
SIGNAL
SIGNAL
CONNECT
ADJUST
GENERATOR
TO
SETTING
FOR
1.
|
IF
10.7
MHz
TPs
Oscilloscope
to
Primary
and
Best
wave
transformer}
+200kHz
TP,
through
secondary
of
IF
form
sweep
generator
0.024F
ceramic
transformer
(Tio1,
capacitor Teor, T202, T20s)
2.
|
Discrimi-’
|
10.7
MHz
TP;
Oscilloscope
to
2C
Primary
and
S
curve
nator
+200
kHz
through
0.02uF
secondary
of
sweep
generator
ceramic
capacitor
discriminator
transformer (To94)
3.
Local
FM
signal
Antenna
|
Oscilloscope
and
88
MHz
|
Local
oscillator
Maximum
oscillator
generator
88MHz,
|
terminals
|
V.T.V.M.
to
load
coil
(Ly)
()
400
Hz,
100%
terminal
modulation
4.
|
Local
FM
signal
Antenna
|
Oscilloscope
and
108
MHz
|
Local
oscillator
Maximum
oscillator
generator
terminals
|
V.T.V.M.
to
load
trimmer
(PT
193)
(2)
108
MHz,
400
Hz,
terminal
100% modulation
5. | Reiterate
3& 4.
6.
|
High-
FM
signal
Antenna
|
Oscilloscope
and
90
MHz
|
Antenna
coil
Maximum
frequency
|
generator
terminals
|
V.T.V.M.
to
load
(La,
Lr)
amp.
90
MHz,
400
Hz,
terminal
circuit
(1)
100%
modulation
7.
|
High-
FM
signal
Antenna
|
Oscilloscope
and
106
MHz
|
Trimmer
Maximum
frequency
|
generator
terminals
|
V.T.V.M.
to
load
(PT
101,
PT
102)
amp.
106
MHz,
400
Hz,
terminal
circuit (2)
8. Reiterate
6&7.
100% modulation
I
FM DISCRIMINATOR CHARACTERISTIC
KHz KHz 19 3
MHz
+100 +200
KHz KHz
FM IF CHARACTERISTIC
ee eee
SS
—200 —-100 10.7
KHz KHz MHz
“+100 + 200
KHz KHz
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