Read Sony SRF-PSY04 Service Manual online
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SECTION 3
ELECTRICAL ADJUSTMENTS
AM IF ADJUSTMENT
Adjust for a maximum reading on level meter
T1
450 kHz
AM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
Frequency Display
Reading on Digital Voltmeter
L5
530 kHz
2.7 ± 0.1V
Confirmation
1,710 kHz
8.9 ± 1V
AM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L2
580 kHz
CT1
1,490 kHz
FM VCO VOLTAGE CONFIRMATION
Frequency Display
Reading on Digital Voltmeter
87.5 MHz
2.7 ± 0.1V
108 MHz
8.9 ± 1V
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
87.5 MHz
CT2
108 MHz
0 dB=1 µV
[AM]
Setting:
BAND switch: AM
BAND switch: AM
[FM]
Setting:
BAND switch:
BAND switch:
FM
FM SENS switch: DX
• Repeat the procedures in each adjustment several times, and the
tracking adjustments should be finally done by the trimmer ca-
pacitors.
pacitors.
Adjustment Location: Main Board (See page 6)
FM RF signal
generator
22.5 kHz frequency
deviation by 400 Hz
signal
Output level: as low as possible
deviation by 400 Hz
signal
Output level: as low as possible
+
–
–
level meter
2
(headphones) jack (J1)
set
MAIN board
TP (ANT)
TP (ANT)
16
Ω
0.01
µ
F
+
–
–
digital voltmeter
MAIN board
TP (VT)
FM STEREO (76 kHz) Adjustment
Setting:
BAND switch:
BAND switch:
FM
FM SENS switch: DX
Procedure:
1. Connect the frequency counter to TP (76 kHz) as shown the
1. Connect the frequency counter to TP (76 kHz) as shown the
figure below.
2. Tune the set to 98 MHz.
3. Adjust RV1 for 76 kHz reading on the frequency counter.
3. Adjust RV1 for 76 kHz reading on the frequency counter.
Specification: 75.5 to 76.5 kHz
Adjustment Location: MAIN board (See page 6)
0.01
µ
F
MAIN board
TP (ANT)
TP (ANT)
set
FM RF signal
generator
generator
Carrier frequency : 98 MHz
Modulation
Modulation
: 1 kHz, 22.5 kHz deviation
Output level
: 562
µ
V (55 dB)
+
–
–
MAIN board
TP (76 kHz)
TP (76 kHz)
+
1
µ
F
frequency
counter
counter
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
2
(headphones) jack (J1)
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