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RX-V990
AM Adjustment (This should be done after
• Connection Diagram (Measuring instruments)
1) Adjustment of sensitivity
See page 10 for
locations & adjustment points.
TP
Adjustment
item
Step
Adjustment
of
1
sensitivity
(1440Hz)
Verification
of
2
sensitivity
(630kHz)
3
Verification
of
sensitivity
Verification
of auto
4
tuning
• : Execution of FACTORY PRESET (Refer to page 7.) will facilitate setting reception frequency for adjustment.
13
adjustment.)
FM
o
AM loop antenna
AMANT
AMSG
AMSG
GND
Reception
Signal (ANT IN)
frequency
AMANT
1440kHz
1440kHz
• (B-3)
50dBµ
1kHz
30% modulation
630kHz
AMANT
630kHz
• (B-1)
50dBµ
1kHz
30% modulation
AMANT
630kHz
• (B-1)
630kHz
1080kHz
1080kHz
1440kHz
• (B-2)
1440kHz
30% modulation
• (B-3)
AMANT
60dBµ
L
ACVM
,
TUNER
R
,
P.
C. B.
REC
DlST.M
OUT
Oscilloscope
Adjustment
Test point
point
T2
RECOUT
T2
RECOUT
AMANT
Rating
Audio output should be
maximized.
Audio output should be
maximized.
Repeat steps 1 and 2.
Distortion should be 10% or less at
each frequency.
Check to ensure that the voltage at
the ANT terminal is 54dBµ or less.
Auto reception
should be avail-
able when the tuning key is moved
UP and DOWN .
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