Sony XR-C543SP Service Manual page 20

FM Polar VCO Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency : 69.5 MHz (FM2: 3CH)
Output level : 60 dB (1 mV)
main board
TP401 (VCO)
Procedure:
1. Connect the frequency counter to the TP401 (VCO) on main
board.
2. Adjust RV402 so that the reading on the frequency counter
becomes to 31.25 ± 0.1 kHz.
Adjustment Location: See page 21.
antenna jack
set
frequency counter
+
–
– 20 –
FM Polar Pilot Adjustment
Setting:
SOURCE button: FM
FM RF signal
generator
Carrier frequency : 69.5 MHz (FM2: 3CH)
Output level : 60 dB (1 mV)
main board
TP402 (PLT)
Procedure:
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 (10 kHz div.)
3. Then output level is supposing that 0 dB.
4. Set the modulation frequency of the FM RF signal generator
to 31.25 kHz (10 kHz div.).
5. Adjust L401 so tha the reading on the level meter becomes to
maximum.
6. Adjust RV401 so that the reading on the level meter becomes
to 13.0 ± 0.5 dB.
Adjustment Location: See page 21.
antenna jack
set
level meter
+
–