Sony cfd-s27 Service Manual page 8

TUNER SECTION
AM Section
Function switch : AM
Volume : MIN
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
FM Section
Function switch : FM
Volume : MIN
FM RF signal
generator
22.5kHz frequency deviation by 400Hz signal.
Output level : as low as possible
set
Frequency Coverage Adjustment
Setting :
[TUNER BOARD]
Adjustment Location : Tuner board (See page 12)
0dB = 1 µV
Put the lead-wire
antenna close to
the set.
0.01 µ F
telescopic
antenna
terminal
level meter
Ω
32
J301 (phones)
Digital voltmeter
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
CFT1
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust part Frequency display
Confirmation
L4
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT2
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
T1
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust part Frequency display
Confirmation
L2
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
Adjustment Location : Tuner board (See page 12)
– 8 –
450kHz
reading on digital
voltmeter
531kHz 0.8 – 1.2 V
1,611kHz 4.9 – 5.3 V
621kHz
1,404kHz
10.7MHz
reading on digital
voltmeter
87.5MHz 1.1 – 1.5 V
108MHz 3.3 – 3.7 V
87.5MHz
108MHz