Section 4 Electrical Adjustment - Sony ICF-F12S Service Manual

ICF-F11S/F12S
0 dB=0.280 mV
[MW]
Setting:
BAND switch : MW
Put the lead-wire
AM RF signal
antenna close to
generator
the set.
30% amplitude
modulation by
400 Hz signal
Output level:
as low as possible
[SW]
Setting:
BAND switch: SW
MAIN board
AM RF signal
TP (ANT)
generator
10 pF
30% amplitude
modulation by
MAIN board
400 Hz signal
TP (GND)
Output level:
as low as possible
[FM]
Setting:
BAND switch: FM
MAIN board
FM RF signal
TP (ANT)
generator
0.01 μF
22.5 kHz frequency
deviation by 400 Hz
MAIN board
signal
TP (GND)
Output level:
as low as possible
• Repeat the procedures in each adjustment several times, and
the tracking adjustments should be fi nally done by the trimmer
capacitors.
• Remove FM antenna in FM adjustment.
6
SECTION 4
ELECTRICAL ADJUSTMENT
MAIN board
TP (SP +)
level meter
4 Ω
+
set
–
MAIN board
TP (SP –)
MAIN board
TP (SP +)
level meter
4 Ω
+
set
–
MAIN board
TP (SP –)
MAIN board
TP (SP +)
level meter
4 Ω
+
set
–
MAIN board
TP (SP –)
MW/SW IF ADJUSTMENT
Adjustment for a maximum reading on level meter
T1
MW FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
L5
CT1-2
MW TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L1
CT1-1
SW FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
L6
CT3
SW TRACKING ADJUSTMENT
Adjust for maximum reading on level meter
L2
CT2
FM FREQUENCY COVERAGE ADJUSTMENT
Adjustment Part
L4
CT1-4
FM TRACKING ADJUSTMENT
Adjust for a maximum reading on level meter
L3
CT1-3
Adjustment Location: MAIN board (See page 7)
455 kHz
Frequency Display
520 kHz
1650 kHz
600 kHz
1400 kHz
no mark: F11S ( ): F12S
Frequency Display
2200 kHz (5800 kHz)
7600 kHz (18250 kHz)
no mark: F11S ( ): F12S
2200 kHz (5800 kHz)
(18250 kHz)
Frequency Display
86.5 MHz
109.5 MHz
86.5 MHz
109.5 MHz