Sony ICF-CD2000 Service Manual page 16

FM VCO Adjustment
Setting:
FM RF SSG
Carrier frequency: 98 MHz
Modulation: no modulation
Output level: 0.1 V (100 dB)
Procedure:
1. Connect the frequency counter as shown the figure below.
(Use a frequency counter having high input impedance)
2. Set the BAND switch to FM position.
3. Tune the set to 98 MHz.
4. Adjust RV1 for 76 kHz reading on the frequency counter.
Specified Value: 75.5 to 76.5 kHz
IC2 4 (VCO)
TP9
240 k Ω
R34
27 k Ω
Adjustment Location: MAIN board
Adjustment and Check Location:
– MAIN Board (Component side) –
AM (MW)
FREQUENCY
COVERAGE
Adjustment
0.01 µ F
MAIN board
FM/SW Telescopic
Antenna (ANT1)
frequency counter
RV1
+
–
L12
SW
FREQUENCY
L13
COVERAGE
Adjustment
FM TRACKING CT3
Adjustment L14
RV2
FM AUTO SCAN
Adjustment
FM AUTO SCAN Adjustment
Setting:
FM RF SSG
Carrier frequency: 98 MHz
Modulation: no modulation
Output level: 0.1 V (100 dB)
Procedure:
1. Connect the tester as shown the figure below.
2. Set the BAND switch to FM position.
3. Tune the set to 98 MHz.
4. Adjust RV2 for +0.275 V reading on the tester.
5. Make sure that the TP429 on LCD board is over 2.4 V.
Specified Value: +0.274 to 0.276 V
LCD board
TP418 (AFC)
TP419 (REG)
Adjustment Location: MAIN board
AM AUTO SCAN Check
In case of failure, check AM tracking adjustment and AM IF ad-
justment, as there is no place to be adjusted. Also, confirm that the
TP16 on the MAIN board voltage is 3.3 V during auto scan and
the TP429 on the LCD board is over 2.4 V at the reception of AM.
L7
CT2
TP
(VT)
CT1
TP16
L8
T1
AM IF
Adjustment
RV1
FM VCO
Adjustment
– 16 –
0.01 µ F
MAIN board
FM/SW Telescopic
Antenna (ANT1)
Tester
+
–
AM (MW)
TRACKING
Adjustment
SW
TRACKING
Adjustment