Sony ICF-SW7600GR Service Manual ▷ View online
4
ICF-SW7600GR
Controls
1
SLEEP button (31)
2
HOLD switch (32)
3
DIRECT button (15, 16)
4
FM/AM button (16, 18, 20)
5
STANDBY MEMORY,
TIMER STANDBY/
STANDBY TIME SET
buttons (28, 30)
TIMER STANDBY/
STANDBY TIME SET
buttons (28, 30)
6
ENTER, LOCAL TIME
SET button (11, 22, 28)
SET button (11, 22, 28)
7
ERASE, DST (Daylight
Saving Time) button (11,
13, 30)
Saving Time) button (11,
13, 30)
8
AM BAND, WORLD
TIME button (13, 18, 20)
TIME button (13, 18, 20)
9
POWER ON/OFF button
0
Number buttons (15, 16,
22, 23, 24)
22, 23, 24)
qa
DISPLAY, EXE button
(13, 15, 16)
Press to switch to clock
display while operating
the radio. Press again to
return to the previous
display. If you do not
press the button, the
display will return to the
previous condition in
about 10 seconds.
(13, 15, 16)
Press to switch to clock
display while operating
the radio. Press again to
return to the previous
display. If you do not
press the button, the
display will return to the
previous condition in
about 10 seconds.
qs
SCAN button (24)
qd
PAGE button (22, 24)
qf
MANUAL TUNE/SCAN
START/STOP, STANDBY
TIME SET/TIME SET
buttons (11, 13, 18, 20, 28)
START/STOP, STANDBY
TIME SET/TIME SET
buttons (11, 13, 18, 20, 28)
Display
1
TUNE indicator (16, 18)
Appears when a station
is tuned in.
Appears when a station
is tuned in.
2
Battery indicator (9)
3
HOLD indicator (32)
Appears when HOLD is
in effect. All buttons will
be inoperative.
Appears when HOLD is
in effect. All buttons will
be inoperative.
4
(Daylight Saving
Time) indicator (12)
Appears when the time
display is adjusted to the
Daylight Saving Time.
Appears when the time
display is adjusted to the
Daylight Saving Time.
5
Preset number/time
difference display (11, 22,
23)
difference display (11, 22,
23)
6
SYNCLOCK
(synchronous detection
lock) indicator (27)
Appears when
synchronous detection is
in effect.
(synchronous detection
lock) indicator (27)
Appears when
synchronous detection is
in effect.
7
SLEEP indicator (31)
Appears when the sleep
timer is in effect.
Appears when the sleep
timer is in effect.
8
STANDBY
,
STANDBY
indicators
(28, 29, 30)
Light up when the
standby timer is set.
Light up when the
standby timer is set.
9
PAGE number display
Appears constantly when
the radio is on.
Appears constantly when
the radio is on.
0
Time/frequency display
5
ICF-SW7600GR
Setting the Current Time
“0:00” flashes in the display when installing the batteries for the first time
or when the unit has been reset. Set the clock to the current time.
or when the unit has been reset. Set the clock to the current time.
This unit can display local time, which is the time for your time zone, as
well as world time, which is the time for any other area in the world.
For the calculation of the time in other areas of the world, the time
difference* between the local time and the UTC (Universal Time
Coordinated) is used (see page 14, “Time difference with UTC for each
area”). To find out the correct time, set the correct time and time
difference of the area you are in.
* This unit uses time zones to pinpoint specific areas.
well as world time, which is the time for any other area in the world.
For the calculation of the time in other areas of the world, the time
difference* between the local time and the UTC (Universal Time
Coordinated) is used (see page 14, “Time difference with UTC for each
area”). To find out the correct time, set the correct time and time
difference of the area you are in.
* This unit uses time zones to pinpoint specific areas.
1
If the radio is turned on, press POWER ON/OFF to
turn it off.
turn it off.
Note
You cannot set the clock when the radio is turned on.
You cannot set the clock when the radio is turned on.
2
Hold down LOCAL TIME SET and press K – or + k
to choose the time difference between your local time
and the UTC.
to choose the time difference between your local time
and the UTC.
TIME ZONE indicator will appear. Each time you press K – or
+ k, the time difference (UTC + or –) and
the “hour” of the clock will increase or
decrease accordingly.
Two short beeps will be heard when
adjusting the time difference to
the “hour” of the clock will increase or
decrease accordingly.
Two short beeps will be heard when
adjusting the time difference to
±0.
When you release LOCAL TIME SET, the
TIME ZONE indicator will disappear and the time difference with
UTC will be determined.
TIME ZONE indicator will disappear and the time difference with
UTC will be determined.
1
2
4
3
2, 4, 5
3
To set the daylight saving time, press DST to display
the
the
indicator.
If daylight saving time is not used in your area, daylight saving
time is not currently in effect, or
time is not currently in effect, or
is already displayed, proceed
to Step 4.
4
Hold down LOCAL TIME SET and press –?K or k?+
to set the local time.
to set the local time.
Each time you press –?K or k?+, the current time will decrease or
increase by a minute. To change the digits rapidly, hold down –?K
or k?+.
Two short beeps will be heard when adjusting the time to “0:00”.
increase by a minute. To change the digits rapidly, hold down –?K
or k?+.
Two short beeps will be heard when adjusting the time to “0:00”.
5
Release LOCAL TIME SET.
“ : ” starts flashing and the clock starts
running.
running.
To switch to clock display while the radio is turned on
Press EXE. The display returns to the previous condition
automatically after about 10 seconds or when EXE is pressed
again. The time display period is extended when the WORLD
TIME button is pressed during clock display, or when K – or
+ k is pressed during world time display. During clock display,
radio operations such as changing frequencies are not possible.
The clock will not be displayed during auto scan (page 20) or
memory scan (page 24).
Press EXE. The display returns to the previous condition
automatically after about 10 seconds or when EXE is pressed
again. The time display period is extended when the WORLD
TIME button is pressed during clock display, or when K – or
+ k is pressed during world time display. During clock display,
radio operations such as changing frequencies are not possible.
The clock will not be displayed during auto scan (page 20) or
memory scan (page 24).
For areas adopting the daylight saving time (summer time)
Press DST to display the
Press DST to display the
indicator if you are now in the
summer time period. When the summer time period has ended,
press DST to clear the
press DST to clear the
indicator. The time display will be
adjusted automatically.
Tips
• The clock is displayed in the 24 hour system.
• Press LOCAL TIME SET to stop the flashing of “0:00”.
• To adjust the time to the second, release LOCAL TIME SET at the time
• The clock is displayed in the 24 hour system.
• Press LOCAL TIME SET to stop the flashing of “0:00”.
• To adjust the time to the second, release LOCAL TIME SET at the time
of the tone.
6
ICF-SW7600GR
SECTION 2
DISASSEMBLY
Note :
Follow the disassembly procedure in the numerical order given.
2-1.
CABINET (REAR)
SECTION 3
ELECTRICAL ADJUSTMENTS
Put the lead-wire
antenna close to
the set.
antenna close to
the set.
AM RF signal
generator
generator
30% amplitude
modulation by
400Hz signal
output level: as low as possible
modulation by
400Hz signal
output level: as low as possible
i
headphones jack (J202)
level meter
set
16
Ω
• AM Section
• FM Section
(1) AM / FM VCO Check and Adjustment
Setting:
ATT switch
: OFF
TONE switch
: MUSIC
AM MODE switch : NORM
Procedure:
1.
1.
Connect digital voltmeter to the TP VT.
2.
Tune the set to AM 150kHz.
3.
Confirm that the reading on the digital voltmeter becomes in
more than 2.2V.
more than 2.2V.
4.
Tune the set to AM 29999kHz.
5.
Confirm that the reading on the digital voltmeter becomes in
less than 13V.
less than 13V.
6.
Tune the set to FM 108.00MHz.
7.
Confirm that the reading on the digital voltmeter becomes in
less than 13V.
less than 13V.
8.
IF the value is more than 13V, adjust T202 so that the reading
on the digital voltmeter becomes in 12.5V.
on the digital voltmeter becomes in 12.5V.
Adjustment Location: MAIN board (See page 8)
(2) 1st IF Adjustment
Setting :
ATT switch
: OFF
TONE switch
: MUSIC
AM MODE switch : NORM
Procedure:
1.
1.
Set the frequencies of the AM RF signal generator and the
frequency display of the set to AM 150kHz.
frequency display of the set to AM 150kHz.
2.
Adjust T104 and T105 so that the reading on level meter
becomes in maximum.
becomes in maximum.
Adjustment Location: MAIN board (See page 8)
FM RF signal
generator
generator
FM RF IN
22.5kHz frequency
deviation by 400Hz signal
output level: as low as possible
deviation by 400Hz signal
output level: as low as possible
set
1
Three screws (+BTP 3
×
25)
2
Two screws (+BTP 3
×
25)
4
Cabinet (rear)
3
Four claws
7
ICF-SW7600GR
NG
Center
NG
NG
OK
(3) 2nd Local Adjustment
Setting:
ATT switch
: OFF
TONE switch
: MUSIC
AM MODE switch : NORM
Procedure:
1.
1.
Connect frequency counter to the TP OSC2 through the high
input impedance amplifier.
input impedance amplifier.
2.
Tune the set to AM 150kHz.
3.
Adjust CT202 so that the reading on the frequency counter
becomes in 53.39000MHz
becomes in 53.39000MHz
±30Hz.(55.38997 to 55.39003MHz)
Adjustment Location: MAIN board (See page 8)
(4) FM Tracking Adjustment
Setting:
ATT switch
: OFF
TONE switch : MUSIC
Procedure:
1.
1.
Set the frequency of the FM RF signal generator and the
frequency display of the set to FM 108.00MHz.
frequency display of the set to FM 108.00MHz.
2.
Adjust CT101 and CT102 so that the reading on level meter
becomes in maximum.
becomes in maximum.
3.
Set the frequency of the FM RF and the frequency display of
the set to FM 76.00MHz.
the set to FM 76.00MHz.
4.
Adjust T101 and T102 so that the reading on level meter
becomes in maximum.
becomes in maximum.
5.
Repeat the above steps 1 to 4 several times.
Adjustment Location: MAIN board (See page 8)
(5) 76kHz (MPX) Adjustment
Setting:
ATT switch
: OFF
TONE switch : MUSIC
Procedure:
1.
1.
Insert Headphones plug into headphones jack (J202) (for VCO
operation).
operation).
2.
Connect a capacitor (10
µF) between IC202 pin1 and GND.
3.
Connect frequency counter to the TP 76K (VCO) through the
high input impedance amplifier.
high input impedance amplifier.
4.
Tune the set to FM 108.00MHz.
5.
Adjust RV203 so that the reading on the frequency counter
becomes in 76kHz
becomes in 76kHz
±300Hz.
6.
Remove the headphones plug.
Adjustment Location: MAIN board (See page 8)
(6) Just Tune Adjustment
Setting :
ATT switch
: OFF
TONE switch : MUSIC
(FM RF signal generator)
Frequency
: 93.025MHz
Moduration
: 22.5kHz
Output level : 54dB
Procedure:
1.
1.
Connect an oscilloscope to the TP SD.
2.
Tune the set to FM 93.00MHz.
3.
Adjust RV202 so that the waveform on the oscilloscope satisfy
as shown the figure.
as shown the figure.
Adjustment Location: MAIN board (See page 8)
(7) SSB 0 Beat Adjustment
Setting :
ATT switch
: OFF
TONE switch : MUSIC
(AM RF signal generator)
Frequency
: AM 150kHz
Moduration
: None
Output level : 44dB
Procedure:
1.
1.
Connect an oscilloscope to the TP DET.
2.
Tune the set to AM 150kHz.
3.
Set the AM MODE switch to SYNC.
4.
Set the SYNC switch to USB.
5.
Adjust CT201 so that the waveform on the oscilloscope is
minimized.
minimized.
6.
Set the LSB/USB switch to LSB.
7.
Adjust CT201 so that the waveform on the oscilloscope is
minimized.
minimized.
8.
Repeat the above steps 4 to 7 several times.
9.
Set the AM MODE switch to SSB.
10. Confirm that the beat sound is changed by turning the
SSB FINE TUNE control.
Adjustment Location: MAIN board (See page 8)