Read Sony XR-C6103SP Service Manual online
– 17 –
FM Polar VCO Adjustment
Setting:
[SOURCE]
button: FM
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 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
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
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)
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)
Output level : 66 dB (1.995 mV)
TP (PLT)
MAIN board
level meter
+
–
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