Sony Walkman SRF-S84 User manual

SRF-S84

SERVICE MANUAL

FM STEREO/AM RADIO

SPECIFICATIONS

E Model

Australian Model

Chinese Model

Ver 1.0 2002.02

Sony Corporation

Personal Audio Company

Published by Sony Engineering Corporation

9-873-482-01

2002B0200-1

Frequency range

FM: 87.5-108 MHz

AM: 530 -1605kHz

Output

2(stereo earphones) jack (Ø3.5mm stereo minijack) load impedance 16Ω

Power output

3.6mW + 3.6mW (at 10% harmonic distortion)

Power requirements

1.5 V DC, one R03 (rize AAA)

Dimensions

Approx.39.5 ×78.5 ×16.5 mm (w / h / d)(Approx. 19/16 × 31/8 ×21/32 inches)

not incl. projecting parts and contorols

Mass Approx.

61.2g (2.16 oz) incl. abattery and stereo earphones

Accessories supplied

stereo earphones (1)

Design and specifications are subject to change without notice

SRF-S84

Specifications ........................................................................... 1

1. GENERAL

Location and Function of Controls .................................... 2

2. DISASSEMBLY

2-1. Cabinet (Rear)............................................................. 3

2-2. Main Board ................................................................. 3

3. DIAL POINTER INSTALLATION ........................... 4

4. ADJUSTMENTS .......................................................... 5

5. DIAGRAMS.................................................................... 6

6. EXPLODEDVIEW.................................................. 10

7. ELECTRICAL PARTS LIST.................................... 11

Flexible Circuit Board Repairing

• Keep the temperature of the soldering iron around 270°C during

repairing.

• Do not touch the soldering iron on the same conductor of the

circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or

unsoldering.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

TABLE OF CONTENTS

SECTION 1

GENERAL

LOCATION AND FUNCTION OF CONTROLS

This section is extracted from

instruction manual.

SRF-S84

SECTION 2

DISASSEMBLY

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

2-1. CABINET (REAR)

2-2. MAIN BOARD

rThe equipment can be removed using the following procedure.

Cabinet (rear)

Set Main board

Cabinet (front

)

Main board

Cabinet (front)

Cabinet (rear)

Screw(B1.7 x 8)

Claw

Claws

SRF-S84 SECTION 3

DIAL POINTER INSTALLATION

Pointer

Cabinet (rear

)

Pointer

Gear (tuning cpacitor)

Cabinet (rear)

Washer

Knob (tuning)

Gear (midway)

CV1

Main board

Cabinet (rear)

1 Insert the pointer into the cabinet (rear).

2 Slide the pointer to arrow direction.

3 Install the gear (tuning capacitor), and engage with pointer as

a figure.

4 Install the gear (midway) and the knob (tuning), and fasten it

with washer.

5 Turn the CV in a direction as a figure.

6 Install the main board.

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

SRF-S84

Procedure :

1. Connect the frequency counter to TP9 as shown the figure.

2. Turn the set to 98MHz.

3. Adjust L4 for 38kHz reading on frequency counter.

Standard Value : 37.95 –38.05kHz

FMVCO Adjustment

FM RF signal

generator

Carrier frequency : 98MHz

Modulation : no modulation

Output level : 100dB µV(100mV)

TP6 (RF IN)

MAIN board

0.01 µF

TUNER SECTION

AM Section

Band : AM

Volume : MAX

FM Section

Band : FM

Volume : MAX

SECTION 4

ADJUSTMENTS

AM RF signal

generator

30% amplitude modulation by 400Hz

signal.

Output level : as low as possible

Put the lead-wire

antenna close to

the set.

FM RF signal

generator

22.5: kHz frequency deviation by

400Hz signal

Output level : as low as possible

TP6 (RF IN)

MAIN board

0.06 µF

set

16 Ω

–

Headphone jack (J1)

level mete

0dB = 1µV• Repeat the procedures in each adjustment several times, and the

frequency coverage and tracking adjustments should be finally

done by the trimmer capacitors.

AM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

CT4

520kHz

1,650kHz

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

CT3

520kHz

1,650kHz

FM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

CT1

86.5MHz

109.5MHz

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

CT2

86.5MHz

109.5MHz

Connect Location :

[MAIN BOARD] (SIDE B)

Adjustment Location :

CT1 : FM Frequency Coverage Adjustment

CT4 : AM Frequency Coverage Adjustment

L3 : AM Frequency Coverage Adjustment

L6: FM Frequency Coverage Adjustment

L2: FM 2ND OSC Adjustment

L5 : AM Tracking Adjustment

CT3: AM Tracking Adjustment

L1 : FM Tracking Adjustment

L4 : FM VCO Adjustment

CT2 : FM Tracking Adjustment

MAIN BOARD (SIDE B)MAIN BOARD (SIDE A)

Procedure :

1. Connect the frequency counter to TP10 as shown the figure.

2. Turn the set to 98MHz.

3. Adjust L2 for 57.1MHz reading on frequency counter.

Standard Value : 56.85 –57.35MHz

2nd OSC Adjustment

FM RF signal

generator

Carrier frequency : 98MHz

Modulation : no modulation

Output level : 100dB µV(100mV)

TP6 (RF IN)

MAIN board

0.01 µF

C12

C10

C23

C7 C4

C11

R11

C18

C21

IC1

C20

C19

-2 -1

FERRITE-ROD

ANTENNA

C22

TP8

TP9

TP10

(11)

1-682-982-

TP9

TP8

Frequency

counter

Connect Location :

[MAIN BOARD] (SIDE B)

C12

C10

C23

C7 C4

C11

R11

C18

C21

IC1

C20

C19

-2 -1

FERRITE-ROD

ANTENNA

C22

TP8

TP9

TP10

(11)

1-682-982-

TP10

Frequency

counter

TP8

SRF-S84

5-1. BLOCK DIAGRAMS

• Signal Path

: FM

: AM

30 11 12

L1,CT2

TRACKING

L5,CT3

TRACKING

2ND OSC

CV1-4

TUNE BAND

VCO

ON/OFF

VCC

L6,CT1

FREQUENCY

COVERAGE

OSC

L3,CT4

FREQUENCY

COVERAGE

FERRITED-ROD

ANTENNA L5

OSC

2ND

VCC

RIPPLE

FILTER

S2-2

MIX

MUTE SW

POWER SW

FM/AM

P02

FM IF

FM ST

FM MONO

POWER

MEGA BASS

OFF

CT2 CV1

CT1 CV2

CT3 CV3

CT4 CV4

IC1

FM/AM FRONT-END,IF AMP,MPX

IC2

MEGA BASS AMP

IC3

HEADPHONE AMP

POWER

MEGA BASS

OFF

DRY BATTERY

SIZE "AAA"

(IEC DESIGNATION R03)

1PC,1.5V

VCC

S1-2 S1-1

FM RF IN

FM RF

AM IN

FM/AM

AM OSC

FM 1ST OSC

FM 2ND

LOCAL

0, π

L-CH IN 2

IN 1

IN 2

OUT 1

MUTE

POWER

VCC

OUT 2

LP IN

R-CH

DET

OUT

MPX

PLL VCO

S2-1

LP GAIN

OUT 2

OUT 1

DET

RV1

VOLUME

LOCAL

OSC

AM RF

AMP

AM BPF

IF AMP

DET

FM RF

AMP

FM LPF

LIMITER

AMP

DISCRI

VCO,

MPX

AM RF

AMP

FM 1ST

OSC

MIX

FM/AM

SELECT

SECTION 5

DIAGRAMS

SRF-S84

RV1

VOLUME w

23 4 5 6 7 8 9

R10

R15

C42

L11

C16

C13

C40 C44

C12

C10

C23

C7 C4

C26

C28

R16

C33

C25

C34

C24

C14

C41

C35

C11

R11

C18

C21

C36

C27

157

14108

-2

-1

IC2

106

IC3

IC1

C29

C31

C30

C38

C32

C37

C39

C43

C17

C20

C19

-2 -1

-2

-1

FERRITE-ROD

ANTENNA

C22

L10

CT4

CT3

CV3

CV4

CT2

CT1

CV1 CV2

(POWER)

MEGABASS

OFF

BAND

FM ST

FM MONO

MAIN BOARD (SIDE A) MAIN BOARD (SIDE B)

TP3

TP5

TP6

TP7

TP8

TP9

TP10

TP4

TP1

TP2

CV1-4

TUNE

DRY BATTERY

SIZE "AAA"

(IEC DESIGNATION R03)

1PC, 1.5V

(11)

1-682-982-

(11)

1-682-982-

5-2. PRINTED WIRING BOARDS

Ref. No. Location

rSemiconductor

Location

IC1 E-6

IC2 B-6

IC3 D-7

Q1 E-7

Note:

•X: parts extracted from the component side.

•b: Pattern from the side which enables seeing.

(The other layers’ patterns are not indicated.)

Caution:

Pattern face side : Parts on the pattern face side seen from the

(Side B) pattern face are indicated.

Parts face side : Parts on the parts face side seen from the

(Side A) parts face are indicated.

SRF-S84

CT1

CT2

CT3

CV1

CV2

CV3

CT4

CV4

C10 C11

C24

C25

C26 C27 C28

C29

C35 C36

C37

1µH

C38

C39

C40

C41 C42

L10

1µH

C13

C14

C17

C18

C19 C20 C21

C22

R4 C33

C34

R15

R16

C30 C31

C32

C43

C44

R11

L11

20µH

R10 R9

C23

C12

C16

18p

4.7

16V 100p

1500p

0.22

5600p

0.22 0.015

0.47

0.047 1000p 0.1

150k

50V

4.7k

0.1 0.1

100

220

0.1

100p 100p

100

6.8

2.2

35V

4.7

16V 1

6.3V

68k 0.47

0.47

50V 10

6.3V

100

6.3V

0.1

2SB1218A

100k 100k

0.015

220

120p

18p

FM/AM FRONT-END

IF DET,FM MPX

FM IF

MUTE

DET OUT

MPX IN

PD1

PD2

ST IND

AGC

GND

+VCC

FM RF

OL AGC

AM OSC

TUN IND

PLL1

PLL2

VCO CONT

R OUT

L OUT

TV 1ST OSC

FM 1ST OSC

AGC AFC

AM RF IN

FE GND FM RF IN

TV RF IN

+VCC FE

IMAGE ADJ

FM 2ND LOCAL

PLL VCO

MUTE

SWITCH

OUT 1

POWER

GND

OUT 2

VCC

POWER

SWITCH

IN 1

IN 2

REF

REF GND

POWER AMP

IC3

IC1

VCC

GND

IN 1

IN 2

HP 1

HP 2

LP IN

LP GAIN

LP OUT

OUT 1

OUT 2

DET IN

IC2

MEGA BASS

AMP

REG

FM ST

FM MONO

BAND

S1-1

S1-2

S2-2

POWER

MEGABASS

OFF

S2-1

TRACKING

FREQUENCY

COVERAGE

FREQUENCY

COVERAGE

2ND OSC

VCO

TUNE

CV1-4 CT3,L5

CT1,L6

CT4,L3

CT2,L1

RV1

DRY BATTERY

REF

CXA1129N-T4

LA3550M-TE-L

LA4535M-TE-L

VOLUME

(IEC DESIGNATION R03)

1PC 1.5V

SIZE"AAA"

5-3. SCHEMATIC DIAGRAM

Note:

• All capacitors are in µF unless otherwise noted. pF: µµF 50 WV or

less are not indicated except for electrolytics and tantalums.

• All resistors are in Ωand 1/4 W or less unless otherwisespecifed.

•A : B+ Line.

•H: adjustment for repair.

• Power voltage is dc 1.5 V and fed with regulated dc power

supply from battery terminal.

• Voltages are dc with respect to ground under no-signal (detuned)

conditions.

no mark : FM

( ) : AM

• Voltages are taken with a VOM (Input impedance 10 MΩ).

Voltage variations may be noted due to normal production

tolerances.

• Signal path.

F: FM

f: AM

SRF-S84

rIC BLOCK DIAGRAMS

IC1 CXA1129N-T4

IC2 LA3550M-TE-L

12 6 8

FM/TV

RF AMP

FM/TV

MIX

FM/TV

1ST LOCAL

OSC

AFC

RF AMP

OVER LOAD

AGC

MIX

PSN

AGC

AF AMP

LPF

DETUNE

DET

LPF

BPF

LOCAL

OSC

1/2

COUNTER

FM/TV

SELECT

DISCRI

LIMITTER

AMP

AM IF AMP

(FM TUN IND)

DET

AGC

TUNING

IND

VCO

MUTE

SEP

CONTROL

ST.

DECORDER

INPUT

BUFF

VCO

LEVEL

CONTROL

BUFF

AMP

SYNC

DET

R CH

AMP

L CH

AMP

LOAD

SELECT

1/2

COUNTER

FM/AM

SELECT

M/ST.SW

ST.IND

FM/TV

30 29 25 24 232628 27 22 20

345 7 9 10 11 12 13 14 15

1617181921

FM/AM

FM/TV 38KHz

π/2

FM/TV

FM/AM

19KHz

π/2

19KHz

38KHz

FM IN

TV IN

FM RF

GAIN ADJ

OL AGC

2ND OSC

AM OSC

TUN IND

PLL1

PLL2

VCO OSC

VCO CONT

R OUT

L OUT

ST IND

PD2

PD1

MPX IN

DET OUT

MUTE

AGC2

FM IF

TV OSC

FM OSC

AGC1

AM IN

POWER

SWITCH

BIAS

MUTE

SWITCH

POWER

SWITCH

IN-1

PRE-GND

IN-2

REF

MUTE

SWITCH

OUT-1

POWER GND

OUT-2

VCC

AMP1

AMP2

ON/OFF 8

IN1

IN2

HP1

HP2

LP-IN

LP-GAIN

LP-OUT

OUT1

OUT2

DET-IN

DET-OUT

REF

VCC

GND

IC3 LA4535M-TE-L

SRF-S84

SECTION 6

EXPLODEDVIEW

NOTE :

• -XX, -X mean standardized parts, so they

may have some difference from the original

one.

• Items marked “ * ”are not stocked since they

are seldom required for routine service. Some

delay should be anticipated when ordering

these items.

• The mechanical parts with no reference

number in the exploded views are not

supplied.

• Accessories and packing materials are given

in the last of this parts list.

1 3-236-173-01 LID, BATTERY CASE

2 3-236-180-01 TERMINAL (+), BATTERY

*3 A-3021-741-A MAIN BOARD, COMPLETE

4 3-236-181-01 TERMINAL (-), BATTERY

5 3-238-306-01 WASHER

6 3-919-915-02 KNOB (TUNING)

7 3-919-918-01 GEAR (MIDWAY)

8 3-919-919-01 GEAR (TUNING CAPACITOR)

9 3-236-177-01 KNOB (BAND)

10 3-919-920-02 ADAPTOR

11 3-880-990-00 SCREW (1.7X3),FLAT,(+) SPECIAL

Ref. No. Part No. Description Remark Ref. No. Part No. Description Remark

• Abbreviation

AUS : Australian

CH : Chinese

TW : Taiwan

• Color Indication ofAppearance Parts Example:

KNOB, BALANCE (WHITE) . . . . (RED)

Parts color Cabinets color

12 3-236-175-01 POINTER

13 3-236-171-01 CABINET (FRONT)

14 3-236-176-01 KNOB (POWER)

15 3-236-178-01 PLATE, TRANSPARENT

16 3-236-179-01 EMBLEM (NO.3), SONY

17 3-236-174-21 PANEL, FRONT...(BLUE)

17 3-236-174-41 PANEL, FRONT...(GOLD)

18 3-236-172-11 CABINET (REAR) (AUS,CH,TW)

18 3-236-172-21 CABINET (REAR) (E)

19 3-318-203-31 SCREW (B1.7X8), TAPPING

20 3-918-543-11 CLIP

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