Sony SRF-PSY04 User manual

MICROFILM

SERVICE MANUAL

FM STEREO/AM PLL

SYNTHESIZED RADIO

US Model

SPECIFICATIONS

SRF-PSY04

Photo: Blue model

Ver 1.0 1999. 06

– 2 –

TABLE OF CONTENTS

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

2. DISASSEMBLY ......................................................... 4

3. ELECTRICAL ADJUSTMENTS......................... 5

4. DIAGRAMS

4-1. Block Diagram ................................................................ 7

4-2. Printed Wiring Boards..................................................... 9

4-3. Schematic Diagram ......................................................... 11

4-4. IC Pin Function Description ........................................... 15

5. EXPLODED VIEW................................................... 16

6. ELECTRICAL PARTS LIST ............................... 17

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.

CF1

mark

Mark Center frequency

red 10.70 MHz

blue 10.67 MHz

orange 10.73 MHz

black 10.64 MHz

white 10.76 MHz

HOW TO CHANGED THE CERAMIC FILTERS

This model is used two ceramic filters of CF1 and CF3.

You must use same type of color marked ceramic filters in order to

meet same specifications.

Therefore, the ceramic filter must be changed two pieces together

since it’s supply two pieces in one package as a spare parts.

– 3 –

SECTION 1

GENERAL This section is extracted from

instruction manual.

– 4 –

FRONT CABINET

MAIN BOARD, KEY BOARD

SECTION 2

DISASSEMBLY

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

front cabinet

two claws

lid, battery case

two screws

(P2

two claws

KEY board

MAIN board

– 5 –

SECTION 3

ELECTRICAL ADJUSTMENTS

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter

T1 450 kHz

AM FREQUENCY COVERAGE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

L5 530 kHz 2.7 ± 0.1V

Confirmation 1,710 kHz 8.9 ± 1V

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L2 580 kHz

CT1 1,490 kHz

FM VCO VOLTAGE CONFIRMATION

Frequency Display Reading on Digital Voltmeter

87.5 MHz 2.7 ± 0.1V

108 MHz 8.9 ± 1V

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L3 87.5 MHz

CT2 108 MHz

0 dB=1 µV

[AM]

Setting:

BAND switch: AM

[FM]

Setting:

BAND switch: FM

FM SENS switch: DX

• Repeat the procedures in each adjustment several times, and the

tracking adjustments should be finally done by the trimmer ca-

pacitors.

Adjustment Location: Main Board (See page 6)

FM RF signal

generator

22.5 kHz frequency

deviation by 400 Hz

signal

Output level: as low as possible

–

level meter

(headphones) jack (J1)

set

MAIN board

TP (ANT) 16

Ω

0.01

–

digital voltmete

MAIN board

TP (VT)

FM STEREO (76 kHz) Adjustment

Setting:

BAND switch: FM

FM SENS switch: DX

Procedure:

1. Connect the frequency counter to TP (76 kHz) as shown the

figure below.

2. Tune the set to 98 MHz.

3. Adjust RV1 for 76 kHz reading on the frequency counter.

Specification: 75.5 to 76.5 kHz

Adjustment Location: MAIN board (See page 6)

0.01

MAIN boar

TP (ANT)

set

FM RF signal

generator

Carrier frequency : 98 MHz

Modulation : 1 kHz, 22.5 kHz deviation

Output level : 562

(

55 dB

)

–

MAIN board

TP (76 kHz)

frequency

counter

AM RF signal

generator

30% amplitude

modulation by

400 Hz signal

Output level: as low as possible

Put the lead-wire

antenna close to

the set.

–

level meter

set

Ω

(headphones) jack (J1)

– 6 –

– MAIN BOARD (Component Side) –

Adjustment Location:

– MAIN BOARD (Conductor Side) –

IC2

IC1

RV1

FM Stereo (76 kHz)

Adjustment

AM Frequency Coverage

Adjustment

CT2

L3 FM Tracking

Adjustment

AM IF Adjustment

CT1

AM Tracking Adjustment

IC1

TP (76 kHz) TP (ANT) TP (VT)

SRF-PSY04

– 7 – – 8 –

SECTION 4

DIAGRAMS

4-1. BLOCK DIAGRAM

16 13

24 22

FRONT-END

FM IF AMP/

DISCRI

DECODER

AMP

SWITCH

POWER

AMP

REGULATOR

1/2

COUNTER

1/2

COUNTER

AM IF AMP/

DET

TUNING

INDICATOR

PD1

VCO

PD2

FRONT-END

FM RF

FM/AM

MIX OUT

CF3

10.7MHz

CF1

10.7MHz

SYSTEM CONTROLLER,

LIQUID CRYSTAL DISPLAY DRIVER,

KEY CONTROL

IC101

CF2

450kHz

FM DISCRI

IF IN

721

L-CH

OUT

R-CH

OUT

123

ST IND

IF IN

PILOT DET

LPF2

TUNE IND

AFC1/AGC

BAND

SELECT

PILOT DET

LPF1

PLL

LPF1

PLL

LPF2

VCO

AM OSC

FM OSC

AM RF

FM/AM FRONT-END,

FM/AM DET, MPX

IC1

RV1

FM STEREO

(76kHz)

AM FREQUENCY

COVERAGE

CT2, L3

FM TRACKING

FM SENS

AM IF

CT1, L2

AM TRACKING

L.P.F.

B.P.F.

FM VCO

BUFFER

FM/AM BAND

SELECT SWITCH

LIQUID CRYSTAL DISPLAY

LCD101

VOLTAGE

DETECT

IC102

B+ SWITCH

Q103, 104

DC/DC

CONVERTER

Q106, 107, T101

LOW-PASS

FILTER

Q101, 102

• SIGNAL PATH

: FM

: AM

POWER

AMP

MUTE

CONTROL

KEY MATRIX

S101 – 111

PC0 – PC3 PB0 – PB2

75kHz

SYSTEM CONTROLLER (IC101) B+

FM/AM TUNER (IC1),

HEADPHONE AMP (IC2) B+

PLL LOW-PASS FILTER CIRCUIT B+

D102

–1

–2

HEADPHONE AMP

IC2

IN1

IN2

OUT1

OUT2

B+

VREF

CT1

D1-1

AM FERRITE-ROD

ANTENNA

FM RF

POWER

XOUT

XIN

MT/SW

REG

VCC

VCOL

VCOH

BAND

12 13 9 11

MUTE

BEEP

181916

LOCAL

D1-2 D3

CT2

AM OSC

FM OSC

RV2

VOL

(HEADPHONE)

DRY BATTERY

SIZE “AAA”

(IEC DESIGNATION R03)

2PCS. 3V

37, 38, 12 – 5

COM0 – COM3

32 – 29

LCD0 – LCD8

28 – 20

SRF-PSY04

– 11 – – 12 –

Note on Schematic Diagram:

• 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 1/4W or less unless otherwise

specified.

•¢: internal component.

•C: panel designation.

•U: B+ Line.

•H: adjustment for repair.

• Power voltage is dc 3V and fed with regulated dc power

supply from battery terminal.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

4-3. SCHEMATIC DIAGRAM • See page 13 forWaveforms. •See page 14 for IC Block Diagrams.

no mark : FM

( ) : AM

〈〈 〉〉 : POWER OFF

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

Voltage variations may be noted due to normal production toler-

ances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal production toler-

ances.

• Circled numbers refer to waveforms.

• Signal path.

F: FM

f: AM

– 13 – – 14 –

• Waveforms

– KEY Board –

1IC101 !™ XOUT

500 mV/DIV, 10 µs/DIV

2IC101 !£ XIN

500 mV/DIV, 10 µs/DIV

3T101

10 V/DIV, 200 ns/DIV

4Q106 Collector

2 V/DIV, 200 ns/DIV

5Q106 Base, Q107 Collector

200 mV/DIV, 200 ns/DIV

1.2 Vp-p

13.3

2 Vp-p

13.3

34 Vp-p

424 ns

5.2 Vp-p

320 ns

616 mVp-p

320 ns

• IC Block Diagrams

– MAIN Board –

IC1 CXA1238M-T6

VCO

REGULATOR

FM FRONT-END

AM FRONT-END

MPX

REGULATOR

MONO/STEREO

SELECT

DECORD

AMP

MUTING

AUTO

BLEND

TUNING

INDICATOR

AM IF/

DET

FM IF/

DISCRI

RIPPLE

FILTER

BAND-PASS

MUTE

2930 242526 212223 181920 1617

2 3 4 5 6 7 8 9

PLL LPF1

PILOT DET LPF2

ST IND/VCO CHECK

L-CH OUT

VCC

R-CH OUT

RIPPLE FILTER

AGC AFC1

AGC AFC2

FM IF IN

AM IF IN

BAND SELECT

GND

TUNE IND

1/2

COUNTER

1/2

COUNTER

PD1

PD2

FM/AM FE OUT

FM GND

FM RF IN

AM RF IN

FM RF

REG

FM OSC

AFC

AM OSC

MUTE

FM DISCRI

GND

PLL LPF2

MPX REG

VCO

IC2 LA4533M

MT/SW

OUT1

POWER GND

OUT2

VCC

P/SW

IN1

PRE GND

IN2

REF

POWER

AMP

POWER

AMP

MUTE

CONTROL

POWER

SWITCH

BIAS

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