XR-1800RD - Sony Car Audio Service Manual (repair manual). Page 10

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10
FM Signal Meter Adjustment
Setting:
[TUNER]
 button: FM1
Procedure:
1. Press 
[OFF]
 button to turn the set OFF.
2. Press 
[4]
 button and 
[5]
 button.
3. Press and hold 
[1]
 button for 3 to 4 seconds.
4. Press 
[TUNER]
 button for 2 to 3 times.
Display
5. Press 
[6]
 button, the test mode is set.
6. Adjust RV100 so that the display indication is “118”.
Display
Specified Value: Display indication: 116 to 120
Adjustment Location: See page 12.
FM Noise Focus Adjustment
Setting:
[TUNER]
 button: FM1
Procedure:
1. Tune the 98.0 MHz.
2. The then output level is supposing that (A) dB.
3. Adjust with the volume RV3 on TU100 so that the output level
is (A) –31 dB then signal generator input set to –20 dB.
Adjustment Location: See page 12.
FM Stereo Separation Adjustment
Setting:
[TUNER]
 button: FM1
Procedure:
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specified Value: Separation more than 26 dB
Adjustment Location: See page 12.
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 TU100
for minimum reading.
R-CH
R-CH
C
D
L-CH
R-CH
Adjust RV4 on TU100
for minimum reading.
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level
: 60 dB (1 mV)
Mode
: mono
Modulation
: 1 kHz, 75 kHz deviation (100%)
0.01 
µ
F
set
antenna jack (CN900)
+
speaker out terminal
level meter
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level
: 76 dB (6.3 mV)
Mode
: stereo
Modulation
: main: 1 kHz, 33.75 kHz deviation (45%)
  sub: 1 kHz, 33.75 kHz deviation (45%)
  19 kHz pilot: 7.5 kHz deviation (10%)
0.01 
µ
F
set
antenna jack (CN900)
+
speaker out terminal
level meter
Ω 
FM RF signal
generator
Carrier frequency : 98.00 MHz
Output level
: 35 dB (56.2 
µ
V)
Mode
: mono
Modulation
: no modulation
0.01 
µ
F
set
antenna jack (CN900)
FM
AMS
REG
FM
AMS
REG
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Display

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