Sony SRF-M73 Operating Instructions (primary... User manual

MICROFILM

SERVICE MANUAL

FM STEREO/AM PLL SYNTHESIZED RADIO

US Model

Panama Model

SPECIFICATIONS

SRF-M73

Ver 1.0 1999. 03

– 2 –

TABLE OF CONTENTS

1. SERVICING NOTES............................................... 2

2. GENERAL ................................................................... 3

3. DISASSEMBLY ......................................................... 4

4. ELECTRICAL ADJUSTMENTS......................... 6

5. DIAGRAMS

5-1. Block Diagram ................................................................ 8

5-2. Printed Wiring Boards..................................................... 10

5-3. Schematic Diagram ......................................................... 13

5-4. IC Pin Function Description ........................................... 18

6. EXPLODED VIEWS................................................ 19

7. ELECTRICAL PARTS LIST ............................... 20

Forced Reset

The system microprocessor can be reset in the following proce-

dure.

Use these procedure when the unit cannot be worked normally

due to the overrunning of the microprocessor, etc.

Procedure:

1. Set to radio OFF.

2. While pressing the [SCAN] button, press two buttons of [START/

STOP] and [BAND] simultaneously for 5 seconds.

3. The unit is reset, and display blinking “AM 12:00”.

SECTION 1

SERVICING NOTES

– 3 –

SECTION 2

GENERAL This section is extracted from

instruction manual.

– 4 –

CABINET (FRONT)/(REAR) ASSY

KEY BOARD

·This set can be disassembled in the order shown below.

SECTION 3

DISASSEMBLY

Set

Key Board Main Board Knob (A

)

Cabinet (Rear) Assy

Cabinet (Front) Assy

three screws

(B1.7

two screws

(B1.7

Remove the battery case lid

of the arrow.

cabinet (front) assy

cabinet (rear) assy

three claws

Open the key board

to direction of the arrow.

four claws

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

– 5 –

MAIN BOARD

KNOB (A)

Note: Check that two switch (S1,

S2) is latched with two

adaptors when carrying

out installation.

screw

(B1.7

Remove two solders.

knob (vol)

two claws

main board

two knobs (A)

claw

two adaptors

– 6 –

AM IF ADJUSTMENT

Adjust for a maximum reading on level meter

T1 450 kHz

AM VCO VOLTAGE ADJUSTMENT

Adjustment Part Frequency Display Reading on Digital Voltmeter

L4 530 kHz (531 kHz) 3 ± 0.1V

Confirmation 1710 kHz (1602 kHz) 9 ± 1V (8.5 ± 1V)

AM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L1 580 kHz (621 kHz)

CT1 1,490 kHz (1,395 kHz)

FM VCO VOLTAGE CONFIRMATION

Frequency Display Reading on Digital Voltmeter

87.5 MHz 3 ± 0.3V

108 MHz Less than 11 ± 1V

FM TRACKING ADJUSTMENT

Adjust for a maximum reading on level meter

L2 87.5 MHz

CT2 108 MHz

( ): Panama model

SECTION 4

ELECTRICAL ADJUSTMENTS

0 dB = 1 µV

[AM]

Setting:

Band switch: AM

[FM]

Setting:

Band switch: FM

• 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 7)

FM RF signal

generator

22.5 kHz frequency

deviation by 400 Hz

signal

Output level: as low as possible

–

level meter

jack (J1)

set

MAIN board

TP (FM IN) 32

Ω

0.01

–

digital voltmete

MAIN board

TP (VT)

FM Free-Run Adjustment

Setting:

Procedure:

1. Connect the frequency counter toTP (MPX) as shown the fig-

ure below.

2. Tune the set to 98 MHz.

3. Adjust RT1 for 76 kHz reading on the frequency counter.

Specification: 75.8 kHz to 76.2 kHz

Adjustment Location: MAIN board (See page 7)

0.01

MAIN boar

TP (FM IN)

set

FM RF signal

generator

Carrier frequency : 98 MHz

Modulation : no modultion

Output level : 0.1 V

(

100 dB

)

–

MAIN board

TP (MPX)

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

jack (J1)

SRF-M73

– 7 – – 8 – – 9 –

– MAIN BOARD (Component Side) –

Adjustment Location:

– MAIN BOARD (Conductor Side) –

AM VCO Voltage Adjustment

RT1

FM Free-Run Adjustment

CT1

AM Tracking Adjustment

AM IF Adjustment

FM Tracking Adjustment

CT2

(MPX)

(FM IN)

(VT)







SECTION 5

DIAGRAMS

5-1. BLOCK DIAGRAM

16 13

24 22

FRONT-END FM IF AMP/

DISCRI DECODER

AMP

SWITCH

BASS

BOOST

CONTROL

POWER

AMP

DET

REGULATOR

1/2

COUNTER

1/2

COUNTER

AM IF AMP/

DET

TUNING

INDICATOR

PD1

VCO

PD2

FRONT-END

FM RF

IN FM/AM

MIX OUT

CF3: US

CF4, 5: PANAMA

10.7MHz

CF1

10.7MHz

BASS BOOST AMP

IC2

SYSTEM CONTROLLER,

LIQUID CRYSTAL DISPLAY DRIVER,

KEY CONTROL

IC101

EEPROM

IC105

CF2

450kHz

FM DISCRI

IF IN 6

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

RT1

FM FREE-RUN

AM VCO VOLTAGE

CT2, L2

FM TRACKING

FM SENS

AM IF

CT1, L1

AM TRACKING

L.P.F.

B.P.F.

BPF1

FM VCO

BUFFER

FM/AM BAND

SELECT SWITCH

COMPARATOR

IC4 (1/2)

LIQUID CRYSTAL DISPLAY

LCD101

VOLTAGE

DETECT

IC102

B+ SWITCH

Q104

DC/DC

CONVERTER

Q103, T101

B+ SWITCH

AM IF

BUFFER

Q4, 5

LOW-PASS

FILTER

Q101

• SIGNAL PATH

: FM

: AM

POWER

AMP

MUTE

CONTROL

RIPPLE FILTER

KEY MATRIX

S101 – 111, 113 – 116

KS0 – KS3 KR0 – KR3

X101

75kHz

SYSTEM CONTROLLER (IC101),

EEPROM (IC105) B+

FM/AM TUNER (IC1),

HEADPHONE AMP (IC3) B+

BASS BOOST AMP (IC2) B+

PLL LOW-PASS FILTER CIRCUIT B+

AM IF AMP CIRCUIT B+

D105

–1

–2

IN1

IN2

HEADPHONE AMP

IC3

IN1

IN2

OUT1

OUT2

OUT1

OUT2

GAIN

B+

VREF

COMPARATOR

IC4 (2/2)

B+

CT1

D1-1

AM FERRITE-ROD

ANTENNA

FM RF

(PANAMA)

POWER

XOUT

XIN

IF ON

DET

MT/SW

REG

VCC

AM IF IN

VCOL

VCOH

BAND

CMP IN

DATA

2 1

16 25 2 1 50

MUTE

BEEP

17212019

LOCAL

MEGA

BASS

OFF

D1-2 D3

CT2

AM OSC L3

FM OSC

RV1

VOL

(HEADPHONE)

DRY BATTERY

SIZE “AAA”

(IEC DESIGNATION R03)

2PCS. 3V

10 – 136 – 9

COM0 – COM3

31 – 34

SEG0 – SEG14

35 – 49

SRF-M73

– 13 – – 14 – – 15 – – 16 –

• Waveforms

– KEY Board –

1IC101 @¢ XOUT

200 mV/DIV, 10 µs/DIV

5-3. SCHEMATIC DIAGRAM • See page 17 for IC Block Diagrams.

2Q103 Base-1, Collector-2

(RADIO ON mode)

200 mV/DIV, 100 ns/DIV

3Q103 Collector-1 (RADIO ON mode)

2 V/DIV, 100 ns/DIV

208 m Vp-p

13.3

616 m Vp-p

243 ns

4.9 Vp-p

243 ns

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 3 V and fed with regulated dc power

supply from battery terminal.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

no mark : FM

():AM

• Voltagesaretakenwith aVOM(Inputimpedance 10 MΩ).

Voltage variations may be noted due to normal produc-

tion tolerances.

• Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal produc-

tion tolerances.

• Circled numbers refer to waveforms.

• Signal path.

F: FM

f: AM

FM FREE-RUN

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