LENCO R25 - FM Alignment Procedure; AM Alignment Procedure

FM Alignment Procedure
Step
Align
Generator
Dial
setting
Adjust
Adjust
for
1.
OIF
Front
end
!F
Maximum
noise
output
2.
Discriminator
1)
Sweep
generator
FM
detector
T101
Maximum
S
curve
top and
bottom
core
2)
98
MHz
400
Hz
T101
Center
meter
98 MHz
Center
position
Top
core
T101
Minimum
distortion
Front end
IF
Minimum distortion
i
3.
OSC
88
MHz
400
Hz
88
MHz
Front
end
Lo
Maximum
75 kHz deviation
4.
OSC
108
MHz
400
Hz
108
MHz
Front
end
Tco
Maximum
75
kHz
deviation
ni
ee
00.
5. Reiterate
3 and 4
6.
High-frequency
§
90
MHz
400
Hz
90
MHz
Front
end
Maximum
Amp. circuit 75 kHz deviation LR1,LR2,LA
7.
High-frequency
106
MHz
400
Hz
106
MHz
Front
end
Maximum
Amp. circuit 75 kHz deviation TCR1, TCR2, TCA
8. Reiterate
6 and7
9.
FM
Stereo
lamp
VR101
19
kHz
setting
with
frequency counter
connected to P123
10.
Stereo
separation
98
MHz
400
Hz
98
MHz
VR102
Maximum
output
difference
75
kHz
deviation
between
P119,
P12)
output
one
channel
only
from
L
output
andthat
from R output of SSG
a
Note: To align, connect the output of FM SSG to 75 ohm an-
tenna terminal and connect the FM output P119 or P120 to
VTVM or oscilloscope to indicate output.
AM Alignment Procedure
Step
Align
SSG
Dial
setting
Adjust
Adjust
for
1.
IF
455
kHz+30
kHz
IFT1
TOO3
Best
IF
curve
1FT2
TO04
Maximum
2.
OSC
535
kHz
535
kHz
OSC
TO02
Maximum
400
Hz
30
%
modulation
3.
OSC
1600
kHz
1,600
kHz
OSC
trimmer
Maximum
400
Hz
Front
end
AM2
30
%o
modulation
Sa
i
ee
ee
SS
ee
4,
Reiterate
2and3
5.
RF
AMP
600
kHz
600
kHz
RF
coil
T001
Maximum
400
Hz
30
°%
modulation
6. .
Antenna
—
—
1,400
kHz
~
1,400
kHz
Frontend
|
Maximum
Circuit
400
Hz
AM1,
AM3
|
30 %o modulation
nn
Note: To align, connect AM S.S.G. to AM antenna terminal
and connect oscilloscope and VTVM to P008 to indicate out-
put.
fae ae eee LAPT pi i 1 she PLA Git
:
:
&
i
4
3
i
i
'
i
i
¥
i
i
i
4
g
a
j
2
*
i
i