Read Sony XR-1800 / XR-1803 / XR-1804 Service Manual online
– 12 –
MW Auto Scan/Stop Level Adjustment
Setting:
[TUNER]
button: MW
FREQUENCY SELECT switch: MW 9 k (XR-1804 only)
Procedure:
1. Tune the set to 999 kHz
2. Connect the digital voltmeter to TP2 (SD) on MAIN board.
3. Adjust RV1 on TU100 so that the reading on the digital volt-
1. Tune the set to 999 kHz
2. Connect the digital voltmeter to TP2 (SD) on MAIN board.
3. Adjust RV1 on TU100 so that the reading on the digital volt-
meter changes point from low to high.
Adjustment Location: See page 13.
FM Noise Focus Adjustment (XR-1804 only)
Setting:
[TUNER]
button: FM1
FREQUENCY SELECT switch: FM 50 k
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
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) –32 dB then signal generator input set to –20 dB.
Adjustment Location: See page 13.
FM Stereo Separation Adjustment
Setting:
[TUNER]
button: FM1
FREQUENCY SELECT switch : FM 50 k (XR-1804 only)
Procedure:
L-CH Stereo separation: A-B
R-CH Stereo separation: C-D
The separations of both channels should be equal.
R-CH Stereo separation: C-D
The separations of both channels should be equal.
Specification: Separation more than 26 dB
Adjustment Location: See page 13.
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
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
4
Ω
FM RF signal
generator
Carrier frequency : 98.0 MHz
Output level
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%)
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
4
Ω
AM RF signal
generator
Carrier frequency : 999 kHz
30% amplitude
modulation by
1 kHz signal
Output level
30% amplitude
modulation by
1 kHz signal
Output level
: 33 dB (44.7
µ
V)
(50
Ω
)
set
AM dummy antenna
30
Ω
15 pF
65 pF
antenna jack (CN900)
+
–
–
TP2 (SD)
MAIN board
digital
voltmeter
voltmeter
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