23
RX-V795a/RDS/HTR-5170
RX-V795a
/
RDS
HTR-5170
FM Adjustment
●
Before Adjustment
1) For dB, 1
µ
V=0dB
µ
Example : 60dB
µ
=1mV
2) 100% modulation means that the frequency deviation is
±
75kHz.
3) Install the Matching Transformer and connect FM SG.
4) Set each switch to the following position unless other-
wise specified.
INPUT SELECTOR .................. TUNER
TUNING MODE ....................... AUTO
●
Connection diagram (Measuring instruments)
1) Discriminator balance adjustment
3) Stereo distortion adjustment/separation adjustment
2) Monaural distortion adjustment
4) Sensitivity Verification
Step
1
2
3
4
5
Test point
Both ends of R25
(Between TP1 and TP2)
REC OUT L, R
Both ends of R25
(Between TP1 and TP2)
REC OUT L, R
Both ends of R25
(Between TP1 and TP2)
Rating
DC 0V
±
100mV
Minimize the dis-
tortion.
DC 0V
±
50mV
Minimize the dis-
tortion (to 43dB
or less).
DC 0V
±
50mV
Adjustment item
Rough adjustment of
discriminator balance
Rough adjustment of
monaural distortion
Fine adjustment of
discriminator balance
Fine adjustment of
monaural distortion
Verification of dis-
criminator balance
Signal (ANT IN)
FM ANT (75
Ω
)
98.1MHz **
70dB
µ
MONO 100Hz
100% modulation
Same as Step 1.
Same as Step 1.
Same as Step 1.
Same as Step 1.
Reception
frequency
98.1MHz
* (A-4)
98.1MHz
* (A-4)
98.1MHz
* (A-4)
98.1MHz
* (A-4)
98.1MHz
* (A-4)
Adjustment
point
T1
(IC1 side core)
T1
(TE1 side core)
T1
(IC1 side core)
T1
(TE1 side core)
T1
(IC1 side core)
* : Execution of FACTORY PRESET (Refer to page 16.) will facilitate setting reception frequency for adjustment.
** Must be 98.1MHz
±
5kHz
R25
GND
FM
ANT
FM
dummy
antenna
Oscillator
FM
SG
TUNER
P. C. B.
DCVM
TP1
TP2
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
SSG
FM
SG
TUNER
P. C.. B.
Oscilloscope
DIST. M
L
R
REC
OUT
YLF-15
(LPF)
ACVM
GND
FM
ANT
FM
dummy
antenna
FM
SG
TUNER
P. C. B.
Oscilloscope
DIST. M
L
R
REC
OUT
ACVM