Sony XR-1800R Service Manual page 14

FM Noise Focus Adjustment
Setting:
[TUNER]
button: FM1
FM RF signal
antenna jack (CN900)
generator
0.01 µ F
set
Carrier frequency : 98.0 MHz
Output level : 60 dB (1 mV)
Mode : mono
Modulation : 1 kHz, 75 kHz deviation (100%)
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 16.
FM Stereo Separation Adjustment
Setting:
[TUNER]
button: FM1
FM RF signal
antenna jack (CN900)
generator
0.01 µ F
set
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%)
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
The separations of both channels should be equal.
Specification: Separation more than 26 dB
Adjustment Location: See page 16.
level meter
4 Ω
+
–
speaker out terminal
level meter
4 Ω
+
–
speaker out terminal
Level meter
reading (dB)
A
B
Adjust RV4 on TU100
for minimum reading.
C
D
Adjust RV4 on TU100
for minimum reading.
– 14 –
FM Signal Meter Adjustment
Setting:
[TUNER]
button: FM1
FM RF signal
generator
0.01 µ F
Carrier frequency : 98.00 MHz
: 35 dB (56.2 µ V)
Output level
Mode : mono
Modulation : no modulation
Procedure:
[OFF]
1. Press button to turn the set OFF.
[4] [5]
2. Press button and button.
[1]
3. Press and hold button for 3 to 4 seconds.
[TUNER]
4. Press button for 2 to 3 times.
Display
FM
[6]
5. Press button, the test mode is set.
6. Adjust RV100 so that the display indication is "118".
Display
FM
Specification: Display indication: 116 to 120
Adjustment Location: See page 16.
antenna jack (CN900)
set
REG AMS
REG AMS