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Alignment B - RK
641
Continuation
of alignment A
Adjusting
element
FM-IF
and
dis-
criminator
Switch power key to on position. Switch to
FM-band
and tune
to any
frequency.
Con-
nect sweep
generator via 0.01 pF capacitor
to J 108 and ground. Connect oscilloscope
to pin 4 an dpin 3 of I-socket.
Wobble
at 10.7 MHz
T102/T103/
T104
Maximum
symme-
trical S-curve
with zero
axis
cross
at 10.7 +
0.1 MHz
Repeat
adjustment
several
times
Figure 8
AM-tracking
Switch power key to on position. Switch to
SW-band
and tune
to any
frequency.
Switch
BFO
to off position. Switch external
antenna
switch (back) to on position. Connect RF-
generator to antenna socket. Connect volt-
meter
across speaker.
LCD-frequency
Figure
9
40 kH2/1 kHz
T108/T109
Max.
| kHz-level
40 kHz/] kHz
Tlll/T105
Max.
| kHz-leve]
Repeat
steps 8.1] to 8.3
Tune RF-generator
+ 4 kHz and carefully
LCD
+ 4 kHz
adjustment
of T110
Same
| kHz-levels
(3 db)
VT103
Minimum
L104/T10}
VT102/VT101
BFO
Figure 9
Switch
power
key to on position.
Switch
to
SW-band
and
tune
to any
frequency.
Switch
BFO
to on position. Set BFO-pitch
control
knob
absolute
to middle
position.
Instru-
ment
connection
as step 8.
LCD-frequency
(at RF-generator)
without
modulation
FM-tracking
Switch
power
key to on position.
Switch
BFO
to off position. Set HF-gain
knob
(VR201)
to right stop. Connect RF-ge-
nerator
to rod antenna
terminal
and
ground.
Connect voltmeter
across speaker.
Repeat
adjustment
several
times
Figure
10
Set RK641-LCD
to
90 MHz
Set RK641-LCD
to 106 MHz
90 MHiz/40 kHz/! kHz
106 MH2/40
kHz/1
kHz
Max.
| kHz-level
Max.
| kHz-level
VR208
19 kHz
Voltmeter
VTVM
Signal level and
stop level
Switch
power
key to on position.
Switch
to AM-band.
Switch
BFO
to off position.
Set RK641-LCD
to 26100 kHz (without
station
on the air), Connect
digital volt-
meter
M]
to collector of @108
and
ground. Connect
digital voltmeter
M2 to
collector of Q107 and ground (Al-p.c.b.).
Repeat adjustment
several
times
Figure
11
FM-pilot
Figure
12
Switch
power key to on position. Switch
to FM-band
and tune
to any LCD-fre-
quency.
Set mono/stereo
switch
to stereo
position. Ground
pin 4 of I-socket via
1Q pF -capacitor
or ground
pin 2 of 1C203
via 10 pF capacitor.
Connect
frequency
counter via 22 k
-resistor
to I1C203,
pin 12 and ground.
Antennenschalter
Ext
Ant
switch
Bild 9
a
1108
Tl11 T110
Figure 9
1109
Signal
Generator
:
to speaker
a
m zum
Lautsprecher
Bild
10
Figure
10]
Rod
Ant
input
terminal
AnschluBpunkt
der Teleskop-
antenne
T101
VT101\
L104
vr102,
zum Lautsprecher
to
speaker
Signal
Generator
VTVM
Voltmeter
Q108
Bild I]
(collector)
VRIOl
9)97
Figure
11
(collector)
'VRINZ
-
4
.
M]
5
M2
Digetal
Voltage
Meter
Digitalvoltmeter
eee
_ [-Buchse
Figure
12
IC203
wr)
|
Frequenzzahler
Freq.Counter
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