Siemens RK 641 Serviceanleitung Seite 6

Ali ent B - RK 641
Continuation Of alignment A
Step Function Preparatim
7. Switch power key to on positicn. Switch to
FM—IF and dis—
criminator FM-band and tune to any frequency. Ccn—
nect sweep generator via 0.01 VF capacitor
Repeat adjustrnent
to J 10Band ground. Connect oscilloscope
several times
to pin an dpin 3 of I-socket.
Figure
B. AM - tracking Switch power key to on position. Switch to
SW—band and tune to any frequency. Switch
Figure 9
SFO to off position. Switch external antenna
switch (back) to on position. Connect RF-
generator to antenna socket. Connect volt-
meter speaker.
6.2
Carefully adjustment Of T110
Repeat steps B.I to 8.3
Tune RF—generator 4 kHz and carefully
adjustrnent Of T I JO
9. ago Switch power key to on position. Switch to
SW-band and tune to any frequency. Switch
Figure 9
BFO to on position. Set BFC-pitch control
knob absolute to middle position. Instru-
ment connection as step 8.
10. FM — tracking Switch power key to on position. Switch
eFo to Off position. Set HF-gain knob
Repeat adjustment
(VR201) to right stop. Connect RF—ge-
several times
nerator to rod antenna terminal and
Figure 10 ground. Cnnect voltmeter across speaker.
Set RK641-LCD to 90 MHz
set RK641-LCD to 106 MHz
Signal level and Switch power key to position. Switch
Stop level to AM-band. Switch EFO to off position.
set RK641-LCD tc 26100 kHz (without
Repeat adjustment
station the air). Connect digital volt—
several times
meter MI to collector of 010B and
Figure II ground. Carnect digital voltmeter M2 to
coliector of G107 and ground (A1—p.c.b.).
FM -pilot Switch power key to on position. Switch
to FM—band and tune to any LCD-fre-
Figure 12
quency. Set mono/stereo switch to stereo
position. Ground pin 4 of I-socket via
10 f-capacitor or ground pin 2 of IC203
via 10 pF capacitor. Connect frequency
counter via 22 k -resistor to IC203,
pin 12 and ground.
Antennenschalter
Ext Ant s•itch
Bild 9
THO
Figure 9
1109
Signal Generator
Adjusting
Signal irvut
Indicated value
element
Wobble at 10.7 MHz T102/T103/
Maximum
symme-
T 104
trical S—curve
with zero axis
at 10.7
0.1 MHz
LCD — frequency
40 kHz/l kHz
T 10B/T109 Max. I kHz—leveJ
kHz/l kHz
T111/T105
Max. I kHz-level
THO
LCD 'kHz
THO Same I kHz—levelS
LCD-frequency
VT
(at RF-generator)
without modulation
90 MHz/40 kHz,'1 kHz
Max. I kHz-level
106 MHz/40 kHz/l kHz
VT102/VT101 Max. kHz—level
VRIOI
1.95 V MI
VA 102 0.5 V M2
VR20B 19 kHz
T 105
VT 103
106
Voltmeter
VTVM
to speaker
zum Lautsprecher
Bild 10
Figure 10
Rod Ant Input
terminal
AnschluBpunkt
der Teleskop-
antenne
TIOI
vT101
Signal Generator
Bild 11 0108
(collector)
Figure II
Digetal
Digi talvol tme ter
Bild 12
I-Buchse
Figure 12
IC203
L 104
VT 102
zum Lautsprecher
to speaker
VTVH
Voltmeter
VRIOI
0107
(collector)
t.
vR102
Voltage Meter
Frequenzzähler
Freq.Counter
lour
22K
VR20B