Sony ICF-SW07 Service Manual ▷ View online
– 29 –
SECTION 4
ELECTRICAL ADJUSTMENTS
AM SECTION
0dB=1
µ
V
2nd LOCAL Adjustment
BAND : AM
VOLUME control : as required
VOLUME control : as required
Connection Points :
Procedure :
1. Tune the set to AM 150kHz.
2. Press the SSB button, and confirm that USB is displayed.
3. Press the
1. Tune the set to AM 150kHz.
2. Press the SSB button, and confirm that USB is displayed.
3. Press the
/1 button.
4. Adjust CT201 to obtain a 55.39MHz on the frequency counter.
Standard value : 55.38997 – 55.39003 MHz
5. Press the
? button only once. (Return to 2 if wrong)
6. Adjust RV203 to obtain a 55.3891MHz on the frequency counter.
Standard value : 55.38907 – 55.38913 MHz
Adjustments Location : MAIN board (see page 33)
1 st IF Adjustment
BAND : AM
VOLUME control : as required
VOLUME control : as required
Setup :
Procedure :
1. Set the frequencies of the AM RF SSG and the frequency dis-
1. Set the frequencies of the AM RF SSG and the frequency dis-
play of the set to 150kHz.
2. Adjust T104 and T105 to obtain a maximum reading on the level
meter.
Adjustments Location : MAIN board (see page 33)
SSB ZERO BEAT Adjustment
Setup :
BAND : AM
MODE : SSB (USB or LSB/CW)
MODE : SSB (USB or LSB/CW)
Procedure :
1. Tune to the strong and stable AM station nearby.
2. Adjust the RV201 to attain zero beat (no beat sound heard).
3. Change the mode to the alternative band ( LSB/CW if USB),
1. Tune to the strong and stable AM station nearby.
2. Adjust the RV201 to attain zero beat (no beat sound heard).
3. Change the mode to the alternative band ( LSB/CW if USB),
and if not, readjust.
Adjustments Location : MAIN board (see page 33)
AM RF SSG
J302(headphone)
level meter
16
Ω
set
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
30% amplitude modulation by 400Hz
signal.
Output level : as low as possible
signal.
Output level : as low as possible
DC5V
S
0.01uF
2.4k
Ω
1M
Ω
1pF
servicing tool
2SK193-E
TP (2ND LOCAL)
frequency
counter
counter
Use a shield
wire as short
as Possible
wire as short
as Possible
[ MAIN BOARD] (Side A)
– 30 –
SW FREQUENCY Adjustment
BAND : AM
VOLUME control : as required
VOLUME control : as required
Connection Points :
Note :
Disconnect a loop antenna ASSY from the antenna board,
and connect two dummy antenna coils in series connection.
and connect two dummy antenna coils in series connection.
ANTENNA
MDULE
(ANTENNA
BOARD)
ANTENNA
CONTROLLER
level meter
16
Ω
J1,J2
J101
(AM EXT ANT)
J302
(headphone)
SET
(MAIN
BOARD)
Procedure :
1. Align the set with the frequency of the AM RF signal generator
1. Align the set with the frequency of the AM RF signal generator
shown on the table below.
2. Align RV401 - RV412 for each band meter band until the high-
est reading is obtained on the level meter.
AM RF SSG frequency
Meter band
Adjust part
2.4MHz
120mb
RV401
3.3MHz
90mb
RV403
3.95MHz
75mb
RV405
4.9MHz
60mb
RV407
6.075MHz
49mb
RV409
7.25MHz
41mb
RV411
9.7MHz
31mb
RV402
11.825MHz
25mb
RV404
13.7MHz
22mb
RV406
15.35MHz
19mb
RV408
18.275MHz
16mb
RV410
23.5MHz
13mb
RV412
Caution :
Always perform the SW Frequency Adjustment after hav-
ing replace the main circuit board or antenna circuit board.
ing replace the main circuit board or antenna circuit board.
Adjustments Location : MAIN board (see page 33)
AM RF SSG
TP
(SG GND)
Two dummy antenna coils 1
µ
H (1-410-497-11)
TP
(DUMMY IN)
(DUMMY IN)
30% amplitude modulation
by 400Hz signal.
Output level :
as low as possible
by 400Hz signal.
Output level :
as low as possible
[ANTENNA BOARD]
(Side B)
(Side B)
0.5pF
– 31 –
FM SECTION
FM FREQUENCY COVERAGE Adjustment
BAND : FM
VOLUME control : as required
VOLUME control : as required
Connection Points :
Procedure :
1. Tune the set to 76MHz.
2. Adjust T201 to obtain a 1.6V on the digital voltmeter.
1. Tune the set to 76MHz.
2. Adjust T201 to obtain a 1.6V on the digital voltmeter.
Standard value : 1.55 – 1.65V
3. Tune the set to 108MHz.
4. Make sure that the digital voltmeter reading is below 11V.
4. Make sure that the digital voltmeter reading is below 11V.
Adjustments Location : MAIN board (see page 33)
FM TRACKING Adjustment
Note :
This adjustment should be performed after the remove Rod
Antenna (ANT102).
This adjustment should be performed after the FM FRE-
QUENCY COVERAGE ADJUSTMENT.
Antenna (ANT102).
This adjustment should be performed after the FM FRE-
QUENCY COVERAGE ADJUSTMENT.
BAND : FM
VOLUME control : as required
VOLUME control : as required
Connection Points :
Procedure :
1. Set the frequencies of the FM RF SSG and the frequency dis-
1. Set the frequencies of the FM RF SSG and the frequency dis-
play of the set to 76MHz.
2. Adjust T106 and T107 to obtain a maximum reading on the level
meter.
3. Set the frequencies of the FM RF SSG and the frequency dis-
play of the set to 108MHz.
4. Adjust CT101 and CT102 to obtain a maximum reading on the
level meter.
5. Repeat the above steps several times, and finish the adjustment
with the trimmers CT101 and CT102.
Adjustments Location : MAIN board (see page 33)
FM RF SSG
0.01uF
TP(ANT)
22.5kHz frequency
deviation by 400Hz signal.
Output level :
as low as possible
deviation by 400Hz signal.
Output level :
as low as possible
[ MAIN BOARD]
(Side A)
(Side A)
J302(headphone)
level meter
16
Ω
set
Digital
Voltmeter
Voltmeter
TP (VT)
[ MAIN BOARD] (Side A)
– 32 –
FM STEREO Adjustment
BAND : FM
ST • MONO switch : ST
VOLUME control : as required
ST • MONO switch : ST
VOLUME control : as required
Connection Points :
Note :
Connect a capacitor (100
µ
F) to TP (DET) during TP (GND).
Procedure :
1. Adjust RV301 to obtain a 76kHz on the frequency counter.
1. Adjust RV301 to obtain a 76kHz on the frequency counter.
Standard value : 75.7 – 76.3MHz
Adjustments Location : MAIN board (see page 33)
SD Adjustment
BAND : FM
VOLUME control : as required
VOLUME control : as required
Connection Points :
Procedure :
1. Set the frequencies of the FM RF SSG and the frequency dis-
1. Set the frequencies of the FM RF SSG and the frequency dis-
play of the set to 93MHz.
2. Adjust RV202 so that a waveform on oscilloscope is as shown
below.
Adjustments Location : MAIN board (see page 33)
oscilloscope
TP(SD)
[ MAIN BOARD] (Side A)
FM RF SSG
0.01uF
TP(ANT)
22.5kHz frequency
deviation by 400Hz signal.
Output level : 54dB
deviation by 400Hz signal.
Output level : 54dB
µ
[ MAIN BOARD]
(Side A)
(Side A)
1pF
1M
Ω
2.4k
Ω
0.01
µ
F
100
µ
F
TP (76k)
TP (DET)
TP (GND)
S
DC5V
2SK193-E
frequency
counter
counter
servicing tool
[ MAIN BOARD] (Side A)
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