Electrical Adjustment; Tuner Section - Sony ZS-M30 Service Manual

5-1.TUNER SECTION

AM Section
RADIO BAND button : MW or LW
Volume : MIN
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
FM Section
RADIO BAND button : FM
Volume : MIN
FM RF signal
generator
22.5kHz frequency deviation by
400Hz signal.
Output level : as low as possible
set
LINE OUT
Adjustment Location : Tuner board (See page 18)
• 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.
T1
MW FREQUENCY COVERAGE ADJUSTMENT
Adjust part Frequency display
L5 531kHz
Confirmation 1,611kHz
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L 3
CT2
SECTION 5
ELECTRICAL ADJUSTMENTS
Put the lead-wire
antenna close to
the supplisd MW/LW
loop antenna.
0.01 uF
telescopic
antenna
terminal
level meter
47K Ω
+
–
450kHz
reading on digital
voltmeter.
Adjustment value: 1.0V
Standaed value: 0.7 to 1.3V
5.1 to 5.9V
621kHz
1,404kHz
LW FREQUENCY COVERAGE ADJUSTMENT
Adjust part Frequency display
CT4 279kHz
Confirmation 153kHz
LW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L 4
CT3
FM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
L6
FM FREQUENCY COVERAGE ADJUSTMENT
Adjust part Frequency display
Confirmation 87.5kHz
Confirmation 108kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L1
CT1
Frequency Coverage Adjustment
Connect Location :
(SIDE B)
TUNER BOARD
ZS-M30
reading on digital
voltmeter
Adjustment value: 5.4 to 6.0V
0.4 to 1.1V
162kHz
261kHz
10.7MHz
reading on digital
voltmeter
1.4 to 2.4V
2.7 to 3.7V
87.5MHz
108MHz
Digital
voltmeter
Ω
100K
+
JW4
—
(VT)
17