SONY ICF-SW7600GE User Manual

ICF-SW7600GR

	SERVICE MANUAL	US Model
	Ver 1.0 2001. 03	Canadian Model
		AEP Model
		Chinese Model
		E Model
		Tourist Model

SPECIFICATIONS

Circuit system	FM:	Super heterodyne
	AM: Dual conversion super heterodyne
Frequency range	FM:	76–108 MHz
	SW:	1 621– 29 999 kHz
	MW: 530–1 620 kHz
	LW: 150–529 kHz
Output	LINE OUT jack (stereo minijack) × 1
	Recording output level approx. 245 mV, output
	impedance less than 10 kΩ
	i(headphones) jack (stereo minijack) × 1 16 Ω
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
	(w/h/d)
Mass	Approx. 536 g
	Approx. 608 g (incl. four R6 (size AA) batteries)

Supplied accessories

Carrying case (1)

Compact antenna AN-71 (1)

Wave Handbook (1)

Design and specifications are subject to change without notice.

FM STEREO/SW/MW/LW

PLL SYNTHESIZED RECEIVER

9-873-099-11 Sony Corporation

2001C1600-1 Audio Entertainment Group

© 2001.3

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 0OR 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.

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.

2

SECTION 1

GENERAL

Front							Rear

ICF-SW7600GR

This section is extracted from instruction manual.

1AM EXT ANT (AM external antenna) jack (35)

2ATT (attenuator) control (21)

3ATT (attenuator) ON/ OFF switch (21)

4LINE OUT (recording output) jack (33)

52 (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.

6DC IN 6V ! (external power input) jack (10)

7LIGHT 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

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

Display

1 SLEEP button (31)

2 HOLD switch (32)

3 DIRECT button (15, 16)

4 FM/AM button (16, 18, 20)

5STANDBY MEMORY, TIMER STANDBY/ STANDBY TIME SET buttons (28, 30)

6ENTER, LOCAL TIME SET button (11, 22, 28)

7ERASE, DST (Daylight Saving Time) button (11, 13, 30)

8AM BAND, WORLD TIME button (13, 18, 20)

9 POWER ON/OFF button

0Number 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)

1TUNE indicator (16, 18) Appears when a station is tuned in.

2 Battery indicator (9)

3HOLD 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.

5Preset number/time difference display (11, 22, 23)

6SYNCLOCK (synchronous detection lock) indicator (27) Appears when synchronous detection is in effect.

7SLEEP indicator (31) Appears when the sleep timer is in effect.

8STANDBY , STANDBY indicators (28, 29, 30)

Light up when the standby timer is set.

9PAGE number display Appears constantly when the radio is on.

0 Time/frequency display

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	4
	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.

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 is already displayed, proceed to Step 4.

4 Hold down LOCAL TIME SET and press –?Kor k?+ to set the local time.

Each time you press –?Kor 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 indicator if you are now in the summer time period. When the summer time period has ended, 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 of the tone.

5

ICF-SW7600GR

SECTION 2

DISASSEMBLY

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

2-1. CABINET (REAR)

2Two screws (+BTP 3 × 25)	1Three screws (+BTP 3 × 25)

4 Cabinet (rear)

3 Four claws

SECTION 3

ELECTRICAL ADJUSTMENTS

• AM Section

AM RF signal generator

Put the lead-wire antenna close to

the set.

30% amplitude modulation by 400Hz signal

output level: as low as possible

• FM Section

FM RF signal generator

FM RF IN

set

22.5kHz frequency deviation by 400Hz signal

output level: as low as possible

level meter

16 Ω

set

iheadphones jack (J202)

(1) AM / FM VCO Check and Adjustment

Setting:
	ATT	switch		: OFF
			switch	: MUSIC
	TONE

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)

(2) 1st IF Adjustment

Setting :
		switch		: OFF
	ATT
			switch	: MUSIC
	TONE

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)

6

ICF-SW7600GR

(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 (10 F) 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.

Adjustment Location: MAIN board (See page 8)

(6) Just Tune Adjustment

Setting :
	ATT	switch		: OFF
			switch : MUSIC
	TONE
(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 RV202 so that the waveform on the oscilloscope satisfy as shown the figure.

Center

NG

NG

NG

OK

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)

7

ICF-SW7600GR

Adjustment Location :

[MAIN BOARD] — Component Side —

			FM TRACKING	T202
			Adjustment
	1st IF		(108MHz)	FM
				VCO
	Adjustment		CT101 CT102
				Adjustment
	T104	T105		RV202
				JUST TUNE
				Adjustment
				RV203
				76kHz
				(MPX)
				Adjustment
			IC201

T101	T102	CT202	CT201
		2nd LOCAL	SSB
FM TRACKING		Adjustment	0 BEAT
Adjustment			Adjustment
(76MHz)

[MAIN BOARD] — Conductor Side —

	2C	2E			E
				CF201	15
		RV202			IC201
				CF203
			CT201
			B		CF204
				C C209
RV203			E
C231		B	C		CF205
		E
					1
5		1E	1C
		1B	2B
		2C	2E
1		2C	2B
			E
B		1C
			1B	1
C	C272
E					IC203
	1		8
	4		5	C253

16

16	CT102					S	T103
		T102	G			D	G	A
				S	T101
						C135
			D	CT101 A
T202		K
						B
					K		C	G
X201		B				E	S	D
				C			A
		A			A	K
		E
						K	T107
								C
							C152
		C		E	E		CN201
E		CT202		B C			1
C							2
30	A				B
B
		K
C221		C262
8
C260
C259		C261
9							17
							18

RV204

VOLUME

A K A K

			76K (VCO)	SD	OSC2	VT
		C267	MPX	JUST	2nd	AM/FM VCO
			Adjustment	TUNE	LOCAL	Adjustment
		DET
		SSB		Adjustment	Adjustment
		0 BEAT
2B	2C	Adjustment
E	1C
1B

8