Sony MW-FX277 Service Manual page 7

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3 7 63 1515 0
TUNER SECTION
AM Section
BAND : AM
AM RF signal
generator
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
TV/FM Section
BAND : TV or FM
TP
(FM/TV IN)
[MAIN BOARD]
(Side B)
TE
L 13942296513
set
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0 dB = 1µ V
Put the lead-wire
antenna close to
the set.
FM RF signal
generator
0.01µF
22.5kHz frequency deviation
by 400Hz signal.
Output level :
as low as possible
level meter
32 Ω
phones jack (J301)
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2 9
8
• Repeat the procedures in each adjustment several times, and the
frequency coverage and tracking adjustments should be finally
done by the trimmer capacitors.
Adjust for a maximum reading on level meter.
RV2
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust parts
Confirmation
L7
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
CT1
TV and FM FREQUENCY COVERAGE CONFIRMATION
Frequency display
Confirmation
Confirmation
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
Q Q
L4
3 6 7 1 3 1 5
Confirmation
TV TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
Confirmation
Adjustment Location :
Frequency Coverage Adjustment
Setting :
[MAIN BOARD]
(Side B)
co
.
– 7 –
9 4 2 8
AM IF ADJUSTMENT
450kHz
Reading on digtal
Frequency display
voltmeter
530kHz Standard value : 3V or less
Adjustment value : 10.0V
1,710kHz
Standard value : 9.9-10.1V
620kHz
1,400kHz
Reading on digtal voltmeter
2CH (TV) Standard value : 1.6 - 2.2V
108MHz (FM) Standard value : 11.0V or less
98MHz
0 5 8 2 9 9 4 2 8
108MHz
2CH
13CH
Main board (See page 8)
TP (VT)
TP (GND)
m
TP
(VT)
9 9
9 9
digital voltmeter
(DC range)