Read Sony SRF-M85 Service Manual online
6
SRF-M85
SECTION 3
ELECTRICAL ADJUSTMENTS
TUNER SECTION
0 dB=1 mV
[AM]
Setting:
BAND button: AM
BAND button: AM
[FM]
Setting:
BAND button: FM
BAND button: FM
•
Repeat the procedures in each adjustment several times, and
the tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
AM RF signal
generator
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
modulation by
400 Hz signal
Output level:
as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
+
–
–
level meter
set
16
Ω
i
jack (J201)
FM RF signal
generator
75 kHz frequency
deviation by 1 kHz
signal
Output level:
as low as possible
deviation by 1 kHz
signal
Output level:
as low as possible
+
–
–
level meter
0.01
µ
F
MAIN board
TP (RF GND)
TP (RF GND)
MAIN board
TP (ANT IN)
TP (ANT IN)
set
16
Ω
i
jack (J201)
digital voltmeter
TP (VT)
TP (RF GND)
MAIN board
AM VCO VOLTAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L104
531 kHz
1.3
±
0.05 V
Confirmation
1,710 kHz
7.7
±
0.3 V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L103
585 kHz
CT101
1,485 kHz
FM FREQUENCY COVERAGE CONFIRMATION
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
Confirmation
108 MHz
8.7
±
0.5 V
Confirmation
87.5 MHz
5.8
±
0.5 V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L102
87.5 MHz
Adjustment and Connecting Location: MAIN board
(See page 7)
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