Sony XR-C550RDS Service Manual page 16

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FM Stereo Separation Adjustment
Setting:
SOURCE button: FM
FM RF signal
antenna jack (J1)
generator
0.01 µ F
Carrier frequency : 98.0 MHz
Output level : 70 dB (3.2 mV)
Mode : stereo
Modulation : main: 1 kHz, 20 kHz deviation (26.7%)
sub: 1 kHz, 20 kHz deviation (26.7%)
: 19 kHz pilot: 7.5 kHz deviation (10%)
Procedure:
FM Stereo
Level meter
signal generator
connection
output channel
L-CH L-CH
R-CH L-CH
R-CH R-CH
L-CH R-CH
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
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The separations of both channels should be equal.
Specification: Separation more than 30 dB
Adjustment Location: See page 18.
FM Noise Focus Adjustment
Setting:
SOURCE button: FM
FM RF signal
antenna jack (J1)
generator
0.01 µ F
Carrier frequency : 98.00 MHz
Output level : 60 dB (1 mV)
Mode : stereo
Modulation : 1 kHz, 75 kHz deviation (100%)
Procedure:
1. Tuner the 98.00 MHz.
2. The then output level is supposing that (B) dB.
3. Adjust with the volume RV3 on TU1 so that the output level is
(B) –32 ± 2 dB then signal generator input set to –20 dB.
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Adjustment Location: See page 18.
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level meter
4 Ω
+
set
–
speaker out terminal
Level meter
reading (dB)
A
B
Adjust RV4 on TU1
for minimum reading.
C
D
Adjust RV4 on TU1
for minimum reading.
level meter
4 Ω
+
set
–
speaker out terminal
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y
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8
FM Signal Meter Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level
Mode
Modulation
Procedure:
1. Set to the test mode. (See page 14.)
2. Push the SOURCE button and set to FM.
FM
3. Push the 6 button.
4. Adjust RV1 so that the display indication is "160".
FM
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Specification: Display indication: 158 to 162
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Adjustment Location: See page 18.
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2 9 9 4 2 8
antenna jack (J1)
0.01 µ F
set
: 35 dB (56.2 µ V)
: mono
: no modulation
Display
REG
INTRO
Display
INTRO
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9