SONY ICF-SW7600GE User Manual

ICF-SW7600GR

SERVICE MANUAL

Ver 1.0 2001. 03

SPECIFICATIONS

Circuit system FM: Super heterodyne

Frequency range FM: 76–108 MHz

Output LINE OUT jack (stereo minijack) × 1

Speaker Approx. 77 mm diameter, 8 Ω × 1
Maximum output 380 mW (at 10 % harmonic distortion)
Power requirements DC 6 V, four R6 (size AA) batteries
External power source DC IN 6V (except Chinese)
Dimensions Approx. 190 × 118.8 × 35.3 mm incl. projecting parts

Mass Approx. 536 g

Supplied accessories

Carrying case (1)
Compact antenna AN-71 (1)
Wave Handbook (1)

AM: Dual conversion super heterodyne

SW: 1 621– 29 999 kHz
MW: 530–1 620 kHz
LW: 150–529 kHz

Recording output level approx. 245 mV, output
impedance less than 10 kΩ

i (headphones) jack (stereo minijack) × 1 16 Ω

(w/h/d)

Approx. 608 g (incl. four R6 (size AA) batteries)

US Model

Canadian Model

AEP Model

Chinese Model

E Model

Tourist Model

9-873-099-11

2001C1600-1

© 2001.3

Design and specifications are subject to change without notice.

FM STEREO/SW/MW/LW

PLL SYNTHESIZED RECEIVER

Sony Corporation

Audio Entertainment Group
General Engineering Dept.

ICF-SW7600GR

TABLE OF CONTENTS

1. GENERAL ···································································3

2. DISASSEMBLY

2-1. Cabinet (Rear) ································································· 6

3. ELECTRICAL ADJUSTMENTS ······························6

4. DIAGRAMS

4-1. Block Diagram ······························································· 9
4-2. Printed Wiring Board

– Main Board (Conductor Side) –································ 10

4-3. Printed Wiring Board

– Main Board (Component Side) – ······························ 11
4-4. Schematic Diagram – Main Board (1/2) – ··················· 12
4-5. Schematic Diagram – Main Board (2/2) – ··················· 13
4-6. Printed Wiring Board – KEY Board – ························· 14
4-7. Schematic Diagram – KEY Board – ···························· 15
4-8. IC Pin Function Description ········································ 16

5. EXPLODED VIEWS

5-1. Cabinet Section ···························································· 17
5-2. Chassis Section ···························································· 18

6. ELECTRICAL PARTS LIST ··································· 19

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH
MARK 0 ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS
LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE
COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS
APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS
PUBLISHED BY SONY.

2

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

SECTION 1

GENERAL

ICF-SW7600GR

This section is extracted from
instruction manual.

Front

1 AM EXT ANT (AM

external antenna) jack (35)

2 ATT (attenuator) control

(21)

3 ATT (attenuator) ON/

OFF switch (21)

4 LINE OUT (recording

output) jack (33)

5 2 (headphones) jack (17,

33)
You can enjoy FM stereo
broadcasting by
connecting the optional
stereo headphones to the
unit . When using
headphones, sound from
the speaker will be
muted.

6 DC IN 6V !

(external power input)
jack (10)

7 LIGHT button

When the display is
difficult to see, press this
button to light up the
display for approximately
10 seconds. Pressing the
button again while the
light is on will turn off the
light. Performing button
operations while the light
is on will extend the
lighting time.

8 Display (7)
9 Controls (6)
0 Speaker

Rear

qa SSB FINE TUNE control (26)
qs LSB/USB selector (26, 27)
qd AM MODE selector (26, 27)
qf TONE selector (33)
qg VOLUME control
qh Telescopic antenna

Always pull out the base of the antenna before use.
Furthermore, do not use unnecessary force when storing the
antenna. At this time, be sure to push in the base as well.

Base

Pull out

qj Stand

qk Battery compartment

3

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)

6 ENTER, LOCAL TIME

SET button (11, 22, 28)

7 ERASE, DST (Daylight

Saving Time) button (11,
13, 30)

8 AM BAND, WORLD

TIME button (13, 18, 20)

9 POWER ON/OFF button

0 Number buttons (15, 16,

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.

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)

Display

1 TUNE indicator (16, 18)

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.

4

(Daylight Saving
Time) indicator (12)
Appears when the time
display is adjusted to the
Daylight Saving Time.

5 Preset number/time

difference display (11, 22,

23)

6 SYNCLOCK

(synchronous detection
lock) indicator (27)
Appears when
synchronous detection is
in effect.

7 SLEEP indicator (31)

Appears when the sleep
timer is in effect.

8 STANDBY

STANDBY
(28, 29, 30)
Light up when the
standby timer is set.

9 PAGE number display

Appears constantly when
the radio is on.

0 Time/frequency display

,
indicators

4

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.

1

2

2, 4, 5

3

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.

1

If the radio is turned on, press POWER ON/OFF to
turn it off.

Note

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.

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 ±0.

When you release LOCAL TIME SET, the
TIME ZONE indicator will disappear and the time difference with
UTC will be determined.

4

ICF-SW7600GR

3

To set the daylight saving time, press DST to display
the

indicator.

If daylight saving time is not used in your area, daylight saving
time is not currently in effect, or
to Step 4.

4

Hold down LOCAL TIME SET and press –?K or k?
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”.

5

Release LOCAL TIME SET.

“ : ” starts flashing and the clock starts
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).

For areas adopting the daylight saving time (summer time)

Press DST to display the
summer time period. When the summer time period has ended,
press DST to clear the
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

of the tone.

indicator if you are now in the

indicator. The time display will be

is already displayed, proceed

+

5

ICF-SW7600GR

r

)

SECTION 2

DISASSEMBLY

Note : Follow the disassembly procedure in the numerical order given.

2-1. CABINET (REAR)

4 Cabinet (rear)

• AM Section

AM RF signal
generator

30% amplitude
modulation by
400Hz signal
output level: as low as possible

• FM Section

FM RF signal
generator

2 Two screws (+BTP 3 × 25)

3 Four claws

ELECTRICAL ADJUSTMENTS

Put the lead-wire
antenna close to
the set.

FM RF IN

1 Three screws (+BTP 3 × 25

SECTION 3

(1) AM / FM VCO Check and Adjustment

Setting:

ATT switch : OFF
TONE switch : MUSIC
AM MODE switch : NORM

Procedure:

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.

4. Tune the set to AM 29999kHz.

5. Confirm that the reading on the digital voltmeter becomes in
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.

8. IF the value is more than 13V, adjust T202 so that the reading
on the digital voltmeter becomes in 12.5V.

Adjustment Location: MAIN board (See page 8)

22.5kHz frequency
deviation by 400Hz signal
output level: as low as possible

set

6

level mete

16 Ω

i

headphones jack (J202)

set

(2) 1st IF Adjustment

Setting :

ATT switch : OFF
TONE switch : MUSIC
AM MODE switch : NORM

Procedure:

1. Set the frequencies of the AM RF signal generator and the
frequency display of the set to AM 150kHz.

2. Adjust T104 and T105 so that the reading on level meter
becomes in maximum.

Adjustment Location: MAIN board (See page 8)

ICF-SW7600GR

r

(3) 2nd Local Adjustment

Setting:

ATT switch : OFF
TONE switch : MUSIC
AM MODE switch : NORM

Procedure:

1. Connect frequency counter to the TP OSC2 through the high
input impedance amplifier.

2. Tune the set to AM 150kHz.

3. Adjust CT202 so that the reading on the frequency counter
becomes in 55.39000MHz±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. Set the frequency of the FM RF signal generator and the
frequency display of the set to FM 108.00MHz.

2. Adjust CT101 and CT102 so that the reading on level meter
becomes in maximum.

3. Set the frequency of the FM RF and the frequency display of
the set to FM 76.00MHz.

4. Adjust T101 and T102 so that the reading on level meter
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. Insert Headphones plug into headphones jack (J202) (for VCO
operation).

2. Connect a capacitor (10µF) between IC202 pin1 and GND.

3. Connect frequency counter to the TP 76K (VCO) through the
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±300Hz.

6. Remove the headphones plug.

(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. Connect an oscilloscope to the TP SD.

2. Tune the set to FM 93.00MHz.

3. Adjust R V202 so that the wa veform on the oscilloscope satisfy
as shown the figure.

Cente

NG

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. 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.

6. Set the SYNC switch to LSB.

7. Adjust CT201 so that the waveform on the oscilloscope is
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)

NG

NG

OK

Adjustment Location: MAIN board (See page 8)

7

ICF-SW7600GR

E

1

C

Adjustment Location :

[MAIN BOARD] — Component Side —

1st IF

Adjustment

T104 T105

T101 T102

FM TRACKING

Adjustment

(76MHz)

FM TRACKING

Adjustment

(108MHz)

CT101 CT102

CT202

2nd LOCAL

Adjustment

T202

FM

VCO

Adjustment

RV202

JUST TUN

Adjustment

RV203

76kHz
(MPX)

Adjustment

IC201

CT201

SSB

0 BEAT

Adjustment

[MAIN BOARD] — Conductor Side —

2C 2E

RV202

RV203

C231

5

1

B

C

E

RV204

VOLUME

C272

1

45

B

E

B

C

E

1E

1C
2B

1B
2C

2E

2C

2B

E

1C

1B

8

KA

K

2B

2C

E

1C

1B

CT201

C267

CF201

CF203

C209

C

18

C253

Adjustment

E

15

CF204

CF205

1

IC203

DET
SSB

0 BEAT

IC201

76K (VCO)

Adjustment

MPX

T202

C

B

C260

C259

Adjustment

CT102

E

A

JUST

TUNE

SD

T102

G

S

T101

C135

A

CT101

D

K

B

A

C

E

E

C

B

CT202

K

C262

C261

K

AAK

E

C

B

OSC2

2nd

LOCAL

AM/FM VCO

Adjustment

Adjustment

16

X201

30

C221

916

VT

S

T103

A

G

D

B

C

G

S

E

K

C152

CN201

2

18

D

T107

C

1

17

8