Sony CDX-4170R, Service Manual

Page: 20 / 44

– 21 –
FM Noise Focus Adjustment
Setting :
D-BASS switch : OFF
SOURCE button : FM
Carrier frequency : 98.00 MHz
Output level
: 60 dB (1 mV)
Mode : stereo
Modulation : 1 kHz, 75 kHz deviation (100%)
Procedure :
1. Tune the 98.00 MHz.
2. The then output level is supposing that (A) dB.
3. Adjust with the volume RV3 on TU101 so that the output level is
(A) – 30
±
1 dB then signal generator input set to – 20 dB.
Adjustment Location : See page 22.
Carrier frequency : 98.00 MHz
Output level
: 35 dB (56.2
µ
V)
Mode : mono
Modulation : no modulation
Procedure :
1. Set to the test mode. (See page 20.)
2. Push the SOURCE button and set to FM.
Display
FM RDS S-Meter Adjustment
Setting :
D-BASS switch : OFF
SOURCE button : FM
3. Push the preset 6 button.
4. Adjust RV101 so that the display indication is “160”.
Display
Specification : Display indication : 158 to 162.
Adjustment Location : See page 22.
FM Stereo Separation Adjustment
Setting :
D-BASS switch : OFF
SOURCE button : FM
FM stereo Level meter Level meter
signal generator connection reading (dB)
output channel
L-CH L-CH
A
B
R-CH L-CH Adjust RV4 on TU101 for
minimum reading.
R-CH R-CH
C
D
L-CH R-CH Adjust RV4 on TU101 for
minimum reading.
L-CH stereo separation :
A
–
B
R-CH stereo separation :
C
–
D
The separations of both channels should be equal.
Specification : Separation more than 28 dB
Adjustment Location : See page 22.
Carrier frequency : 98.00 MHz
Output level
: 70 dB (3.2 mV)
Mode : stereo
Modulation : main : 1 kHz, 20 kHz deviation (26.5%)
sub : 1 kHz, 20 kHz deviation (26.5%)
19 kHz pilot : 7.5 kHz deviation (10%)
Procedure :
FM RF signal
generator
0.01
µ
F
antenna
terminal
set
LINE OUT REAR
10 k
Ω
level meter
FM RF signal
generator
0.01
µ
F
antenna
terminal
set
LINE OUT REAR
10 k
Ω
level meter
FM RF signal
generator
0.01
µ
F
antenna
terminal
set
INTRO
REG
INTRO
REG