, RX-DT30
1
H Measurements and Adjustments
n
TUNER SECTION
. ALIGNMENT INSTRUCTION
READ CAREFULLY BEFORE AT-TEMPTING ALIGNMENT
l
Set power source voltage to 12 V DC.
l
Set XBS switch to minimum
l
Set volume control to maximum
l
Output of signal generator should be no higher than necessary
l
Set band switch to AM or FM
to obtain an output reading.
l
Set selector switch to RADIO
Note :
l
No FM STEREO alignment is required due to Tuner
IC
(BAl442A)
is used.
SIGNAL GENERATOR or
INDICATOR
SWEEP GENERATOR
RADIO DIAL
(ELECTRONIC
ADJUSTMENT
SETTING
VOLTMETER or
(Shown in Fig. 1)
REMARKS
CONNECTIONS FREQUENCY
OSCILLOSCOPE)
Fashion a loop of
Headphone Jack
several turns of
455
kHz
Point of
non-
(32D)
wire and radiate a
30
%
Mod.
interference.(on/
abicale
c
tfw
plug as
shown
T2(AM
IFT)
Adjust for maximum output.
signal into the loop at 400 Hz
about
6OOkHz)
in Fig.2 and then connect
ant. of receiver.
tie
lead wires of Me plug
to
the
measuring instrument.
. AM-IF ALIGNMENT
l AM-RF ALIGNMENT
SIGNAL GENERATOR or
INDICATOR
SWEEP GENERATOR
RADIO DIAL
(ELECTRONIC
ADJUSTMENT
REMARKS
SETTING
VOLTMETER or
(Shown in Fig. 1)
CONNECTIONS FREQUENCY
OSCILLOSCOPE)
511
kHz
Tuningcapacitor
II
II
fully
closed.
L4(AM
OSC Coil)
Adjust for maximum output.
II
1753
kHz
Tuningcapacitor
fully
opened.
CT1
-4(AM
OSCTrimmer)
Adjust for maximum output.
600
kHz
Tune to signal
[‘I]
LS(AM
ANT Coil)
Adjust for maximum output. Adjust L3 by
moving coil bobbin along ferrite core.
II
1500
kHz
I,
[‘I]
Fix antenna coil with wax after completing alignment.
CT1
-3(AM
ANT
Trimmer) Adjust for maximum output.
l FM-IF ALIGNMENT
SIGNAL GENERATOR or
SWEEP GENERATOR
CONNECTIONS FREQUENCY
RADIO DIAL
SETTING
INDICATOR
(ELECTRONIC
VOLTMETER or
OSCILLOSCOPE)
ADJUSTMENT
(Shown in Fig. 1)
REMARKS
Connect to test
pointm
through
ceramic capacitor.
Negative side to
test point
m
.
10.7 MHz
(Sweep)
Connect vert. amp. of
Point of
non-
scope to test point
interference.(on/
m
about 90 MHz)
Negative side to test
point
m.
Tl(FM 1st)
Waveform is shown in Fig. 3
TB(FM
2nd)
Waveform is shown in Fig. 4
l FM-RF ALIGNMENT
Connect to test
point
m
through FM dummy
antenna.
Negative side to
test point
m
66.2 MHz
109.2 MHz
106 MHz
Variable
capacitor
fully closed.
Variable
capacitor
fully
opened.
Headphone Jack
(32~)
Fabicale
the plug as
shown
in
Fig.2 and then connect
L2
(FM OSC Coil)
[*2]
Adjust for maximum output.
the lead wires of the plug
to
the measuring instrument.
>
CT1 -2 (FM OSC
II
8,
Trimmer)
Tune to signal
I,
CTI-1
(FM ANT
Trimmer)
[*2]
Three output response will be present; proper tuning is the center frequency.
-3O-
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