Tuner Section - Sony CFD-CD777SMK2 Service Manual

TUNER SECTION

[FM]
Setting:
FUNCTION switch : RADIO
BAND switch : FM
FM RF SSG
22.5 kHz frequency deviation
by 400 Hz signal.
output level: as low as possible
[MW]
Setting:
FUNCTION switch : RADIO
BAND switch : MW
AM RF SSG
30% amplitude modulation by
400 Hz signal
output level: as low as possible
[SW]
Setting:
FUNCTION switch : RADIO
BAND switch : SW1/SW2
FINE TUNING knob ...................................... Mechanical center
AM RF SSG
30% amplitude modulation by
400 Hz signal
output level: as low as possible
32 Ω
set
PHONES jack (J301)
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L2
CT2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
CT1
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
0 dB=1 µV
FM/SW
0.01 µ F
telescopic
antenna
terminal
Put the lead-wire
antenna close to
the set.
FM/SW
12 PF
telescopic
antenna
terminal
level meter
+
–
86.5 MHz
109.5 MHz
86.5 MHz
109.5 MHz
455 kHz
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L4
CT4
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
CT3
SW1 FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L6
CT6
SW1 TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L5
CT5
SW2 FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter
L8
CT8
SW2 TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L7
CT7
FM VCO Adjustment
Setting:
FM RF SSG
Carrier frequency : 98 MHz
Modulation : 400 Hz, 30% FM modultion
Output level : 0.1 V (100 dB)
Procedure:
1. Connect the frequency counter to pin 4 and 7 of IC1 as shown
the figure below.
2. Tune the set to 98 MHz.
3. Adjust RV2 for 76 kHz ± 500 Hz reading on the frequency
counter.
MAIN board
1 µ F
IC1 pin 4
+
IC1 pin 7
33 k Ω
Adjustment Location: MAIN board (See page 14)
CFD-CD777SMK2
520 kHz
1,680 kHz
620 kHz
1,400 kHz
2.2 MHz
7.3 MHz
2.2 MHz
7.3 MHz
6.8 MHz
22.5 MHz
6.8 MHz
22.5 MHz
MAIN board
IC1 pin qk
0.001 µ F
set
frequency counter
+
–
13