Read Sony SRF-M35 (serv.man2) Service Manual online
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SECTION 3
ELECTRICAL ADJUSTMENTS
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter.
TI
450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjust for a maximum reading on level meter.
L5
531 kHz
2.7V
±
0.1V
Confirm
1,602 kHz
8.9V
±
1V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L2
621 kHZ
CT1
1,395 kHz
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter.
L3
87.5 MHZ
CT2
108.0 MHz
Setting:
BAND switch: AM
BAND switch: AM
Setting:
BAND switch:
BAND switch:
AM
FM SENS switch: DX
AM Section
AM RF signal
generator
generator
30% amplitude modulation by
400 Hz signal.
Output level: as low as possible
400 Hz signal.
Output level: as low as possible
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
FM Section
FM RF signal
generator
generator
22.5 kHz frequency deviation
by 400 Hz signal.
Output level: as low as possible
by 400 Hz signal.
Output level: as low as possible
0.01
µ
F
TP (ANT)
• Repeat the procedures in each adjustment several times, and the frequency
coverage and tracking adjustments should be finally done by the trimmer
capacitors.
capacitors.
FM VCO Voltage Check
Setting:
BAND switch:
FM
FM SENS switch: DX
Procedure:
1.
Tuen the set to 108.0 MHz.
2.
Confirm that the digital voltmeter reading 8.9
±
1 V.
3.
Tuen the set to 87.5 MHz.
4.
Confirm that the digital voltmeter reading is 2.7 V
±
0.1 V.
Connection:
For AM frequency coverage adjustment and FM VCO voltage check.
level meter
set
headphone jack (
i
)
16
Ω
+
–
–
digital
voltmeter
voltmeter
TP (LPF)
FM STEREO (76 kHz) Adjustment
Setting:
BAND switch:
FM
FM SENS switch: DX
Procedure:
FM RF signal
generator
generator
Carrier frequency: 98 MHz
Modulation: 1 kHz, 22.5 kHz deviation
Output level: 562
Modulation: 1 kHz, 22.5 kHz deviation
Output level: 562
µ
V (55 dB)
0.01
µ
F
TP (ANT)
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