XR-C6103SP - Sony Car Audio Service Manual (repair manual). Page 17

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FM Polar VCO Adjustment
Setting:
[SOURCE]
button: FM
Procedure:
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 TP (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 18.
FM Polar Pilot Adjustment
Setting:
[SOURCE]
button: FM
Procedure:
1. Connect the level meter to the TP (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
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 18.
set
FM RF signal
generator
antenna jack (J1)
Carrier frequency : 69.5 MHz
Output level          : 66 dB (1.995 mV)
    
TP (VCO)
MAIN board
frequency counter
+
set
FM RF signal
generator
antenna jack (J1)
Carrier frequency : 69.5 MHz
Output level          : 66 dB (1.995 mV)
    
TP (PLT)
MAIN board
level meter
+
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