Read Sony XR-C6093SP Service Manual online
– 16 –
MW Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
and
[MODE]
button: MW
Procedure:
1. Tune the set to 999 kHz
2. Connect the digital voltmeter to TP (SD) on MAIN board.
3. Adjust RV1 on TU1 so that the reading on the digital voltme-
1. Tune the set to 999 kHz
2. Connect the digital voltmeter to TP (SD) on MAIN board.
3. Adjust RV1 on TU1 so that the reading on the digital voltme-
ter changes point from low to high.
Adjustment Location: See page 17.
FM Polar VCO Adjustment
Setting:
[SOURCE]
button: FM2
Procedure:
1. Tune the set to 69.5 MHz, and set the internal modulation level
1. Tune the set to 69.5 MHz, and set the internal modulation level
of the FM RF signal generator to 10 kHz deviation (20%).
2. Connect the frequency counter to the TP401 (VCO) on MAIN
board.
3. Adjust RV402 so that the reading on the frequency counter
becomes to 31.25 ± 0.1 kHz.
Adjustment Location: See page 17.
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 terminal
TP401 (VCO)
MAIN board
frequency counter
+
–
set
FM RF signal
generator
antenna terminal
Carrier frequency : 69.5 MHz
Output level : 66 dB (1.995 mV)
Output level : 66 dB (1.995 mV)
+
–
–
TP (SD)
MAIN board
digital
voltmeter
voltmeter
FM Polar Pilot Adjustment
Setting:
[SOURCE]
button: FM2
Procedure:
1. Connect the level meter to the TP402 (PLT) on MAIN board.
2. Set the modulation frequency of the FM RF signal generator
1. Connect the level meter to the TP402 (PLT) on MAIN board.
2. Set the modulation frequency of the FM RF signal generator
to 1 kHz, 40 kHz deviation (80 %)
3. Then output level is supposing that (A) dB.
4. Set the modulation frequency of the FM RF signal generator
4. Set the modulation frequency of the FM RF signal generator
to 31.25 kHz, 10 kHz deviation (20%)
5. Adjust L401 so that the reading on the level meter becomes to
maximum.
6. Adjust RV401 so that the reading on the level meter becomes
to (A) + 13.0 dB ± 0.5 dB.
Adjustment Location: See page 17.
set
FM RF signal
generator
antenna terminal
Carrier frequency : 69.5 MHz
Output level : 66 dB (1.995 mV)
Output level : 66 dB (1.995 mV)
TP402 (PLT)
MAIN board
level meter
+
–
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