23
RX-V495/RX-V495RDS/HTR-5140/HTR-5140RDS
1. Before Adjustment
For dB
µ
, 1
µ
V=0dB
µ
applies.
Example : 60dB
µ
=1mV
100% modulation means that the frequency deviation is
±
75kHz.
Install the Matching Transformer and connect FM SG.
2. Connection diagram (Measuring instruments)
Discriminator balance adjustment.
FM Adjustment
Set each switch to the following position unless otherwise
specified.
INPUT SELECTOR ....... TUNER
TUNING MODE ............. AUTO
Stereo distortion adjustment/separation adjustment.
Monaural distortion adjustment
Sensitivity Verfication
See page 22 for TP locations & adjustment points.
Step
Adjustment item
Signal (ANT IN)
Test point
Rating
Reception
frequency
Adjustment
point
Rough adjustment of
discriminator balance
FM ANT (75
Ω
)
98.1MHz
70dB
µ
MONO 100Hz
100% modulation
98.1MHz
(A-4)
T1
(Front side core)
Both ends of R25
(Between TP1 and TP2)
DC 0V
±
100mV
1
Rough adjustment of
monaural distortion
Same as Step 1.
98.1MHz
(A-4)
T1
(Antenna side core)
REC OUT L, R
Minimize the distortion.
2
Fine adjustment of
discriminator balance
Same as Step 1.
98.1MHz
(A-4)
T1
(Front side core)
Both ends of R25
(Between TP1 and TP2)
DC 0V
±
50mV
3
Fine adjustment of
monaural distortion
Same as Step 1.
98.1MHz
(A-4)
T1
(Antenna side core)
REC OUT L, R
Minimize the distortion
(0.9%/–41dB or less).
4
Verification of
discriminator balance
Same as Step 1.
98.1MHz
(A-4)
T1
(Front side core)
Both ends of R25
(Between TP1 and TP2)
DC 0V
±
50mV
5
Execution of FACTORY PRESET (Refer to page 20) will facilitate setting reception frequency for adjustment.
R25
GND
FM
ANT
FM
dummy
antenna
Oscillator
FM
SG
TUNER
P. C. B.
DCVM
TP1
TP2
GND
FM
ANT
FM
dummy
antenna
SSG
FM
SG
TUNER
P. C. B.
Oscilloscope
DIST. M
L
R
REC
OUT
YLF-15
(LPF)
ACVM
GND
FM
ANT
FM
dummy
antenna
Oscillator
FM
SG
TUNER
P. C. B.
Oscilloscope
DIST. M
L
R
REC
OUT
GND
FM
ANT
FM
dummy
antenna
FM
SG
TUNER
P. C. B.
Oscilloscope
DIST. M
L
R
REC
OUT
ACVM