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3. ALIGNMENT PROCEDURES
* A dummy resistor of 47 kohms must be connected across the tape output terminals before alignment.
3.1 FM ALIGNMENT PROCEDURES
(Selector switch in the '"FM" position)
Signal Source
Connection
Sweep generator to
point (B) through
5pF capacitor
RF generator to
FM antenna
terminals (@) through
matching network
(300 ohms, balanced}
Maintain RF level
below limit.)
Signal
Indicator
Set Dial
Frequency
Connection
Pointer to:
FM IF ALIGNMENT
Oscilloscope to
L104 for maximum and
10.7 MHz
:
2:
ont
©
symmetric
response.
market at
e
Quiet point on
x
F:
10.6, 10.7 and
band.
10.8 MHz
L201 for straight and
i
t
4
aa
of
te
a
°
symmetric
"S" curve
P
response,
Repeat steps 1 and 2.
FM RF ALIGNMENT
87.4 MHz with
L103 for maximum
tuning gang closed.
output.
109 MHz with
C119 for maximum
VTVMtoLorR
tuning gang open.
output.
channel output
(W002)
L101, L102 for
90 MHz
maximum
output.
100 MHz
Ant. RF trimmer for
106 MHz
106 MHz
maximum output.
Repeat steps 1 to 4.
Check overall response curve and repeat above steps as necessary to obtain maximum
sensitivity.
No connection
RF generator
1 mV
output to FM antenna
terminals (A) through
matching network
(300 ohms, balanced)
RF generator 12.5uV
output to FM antenna
terminals (A) through
matching network
(300 ohms, balanced)
L201 primary core
No signal
DC VTVM
{bottom) for ''0'' voltage
1-voit range to ©)
'
|
reading.
L201 secondary core
(upper) for minimum
distortion.
Distortion meter to
R232 so that signal
strength meter M00 1
may read 85%.
MUTING CIRCUIT ALIGNMENT
R233 for 12.5uV
VTVMtoRorL
threshold level. (During
channel output
98 MHz
the adjustment turn
(W002)
the muting pushswitch
"ON"),
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