Rotel RX-203 Bedienungsanleitung Seite 8

H.D. ANALYZER
OSCILLOSCOPE
REAR
300 OHM
DUMMY
FM IF and RF Alignment
Instruments: FM Signal Generator,
Oscilloscope.
• Set Function Selector to FM position.
• Connect FM Signal Generator
minal.
• Connect Oscilloscope and H.D. Analyzer
OUT jack.
A. FM IF Alignment
1. Set Signal Generator frequency at 98MHz (400Hz
100% Mod.) and adjust the Tuning to Max. output.
(The antenna terminal
60dB).
2. Tuning Signal Meter to obtain
3. Adjust IF coil L 108 and L 109 set distortion
minimum lower then 0.3%
B. FM RF Alignment
1. Set Signal Generator frequency
100%Mod.) and also tune receiver at 106MHz
the dial scale. Then adjust
(on Front-end) to obtain
CHASSIS
L109 L108
FM OSC IFT
VR 101
IC301
PANEL
o
FM SIGNAL
GENERATOR
Procedure
H.D. Analyzer and
to FM antenna ter-
to TAPE
voltage should be ImV,
Max.
to
at 106MHz (400Hz
on
FM OSC trimmer CT3
maximum deflection on
TOP VIEW (FM
FM IFT
CZZ] IC101
L203 L202 L201
coo
L105 OSC
CT3
L 204
osc
VR302
Fig. 3. FM IF and RF Alignment
Abb. 3. UKW-ZF-und HF-Abgleich
Fig. 3. Alignement FM IF et HF
Scope.
Set the receiver at 90MHz
2.
change the frequency of Signal Generator so that
the output of the TAPE OUT becomes maximum.
Then make sure Signal Generator frequency stays
within 90MHz± 150KHz.
Sensitivity on this alignment must be attempted at
3.
106MHz by adjusing
maximum deflection
balance sensitivity at 90 and 106MHz.
4. Adjust FM OSC coil L105 and FM RF coil L101,
L102, L103 and L104 as discribed below only
when tracking and sensitivity adjustments are not
Fine tune Signal Generator
a.
90MHz, and adjust L107,
and L 104.
Fine tune Signal
b.
106MHz, and adjust CTI, CT2 and CT3 so that
maximum output
Repeat step a and b to obtain
c.
PORTION )
IC401
ICL.02
L 101
L107
L102
L103g
CTI
CT2
ANT
Hook-Up
on the dial scale, and
CTI and CT 2 to obtain
on Scope and fine tune to
and receiver to
LIOI L102, L 103
Generator and receiver to
is obtained.
enough effect