Sony SRF-M55 User manual

Ver 1.0 1999.09

MICROFILM

SRF-M55

SERVICE MANUAL

FM STEREO PLL SYNTHESIZED RADIO

SPECIFICATIONS

AEP Model

E Model

Chinese Model

– 2 –

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

1. GENERAL

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

2. DISASSEMBLY

2-1. “Cabinet ASSY, Front”, “Cabinet ASSY, Rear” ......... 3

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

2-3. LCD201 ...................................................................... 4

2-4. Microcomputer Board................................................. 4

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

4. DIAGRAMS

4-1. Explanation of IC Terminals....................................... 6

4-2. Block Diagrams .......................................................... 7

4-3. Printed Wiring Boards .............................................. 10

4-4. Schematic Diagram................................................... 13

5. EXPLODEDVIEW..................................................... 17

6. ELECTRICAL PARTS LIST.................................... 18

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

– 3 –

SECTION 2

DISASSEMBLY

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

2-1.“CABINET ASSY, FRONT”,“CABINET ASSY, REAR”

2-2. MAIN BOARD

rThe equipment can be removed using the following procedure.

Cabinet ASSY, Front

Cabinet ASSY, Rear

Set Main board

Microcomputer board

LCD201

Screws (B1.7x8)

Claws

Flexible board

(10 core)

LCD flexible board (13 core)

Cabinet ASSY, rear

Cabinet ASSY, front

Claw

Main board

Cabinet ASSY, front

Button (power)

Lid, battery case

Claw

– 4 –

2-3. LCD201

2-4. MICROCOMPUTER BOARD

Claws

Cabinet ASSY, fron

LCD201

Screws (1.4)

Cabinet ASSY, rear

Claw

Claws

Microcomputer board

Cover, side

– 5 –

FM STEREO (19kHz) Adjustment

Setting :

Procedure :

1. Connect the frequency counter to TP (19kHz).

2. Turn the set to 98MHz.

3. Adjust RV1 for 19kHz reading frequency counter.

Standard Value : 18.9 –19.1kHz

Connection:

SECTION 3

ADJUSTMENTS

FM Section

Setting :

Connection:

For FM frequency coverage adjustment

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

frequency coverage and tracking adjustments should be finally

done by the trimmer capacitors.

FM IF ADJUSTMENT

Adjust for a maximum reading on level meter.

T1 10.7MHz

FM FREQUENCY COVERAGE ADJUSTMENT

Adjust for a maximum reading on level meter.

CT2 87.5MHz adjustment value: 2V

standard value: 1.5 – 2.5V

Confirm 108.0MHz standard value: 9 – 13V

FMTRACKING ADJUSTMENT

Adjust for a maximum reading on level meter.

CT1 98MHz

FM RF signal

generator

22.5kHz frequency deviation by

400Hz signal.

Output level : as low as possible

TP (ANT)

0.01

set

Ω

headphones jack EP1 (

)

level mete

FM RF signal

generator

Carrier frequency : 98MHz

Modulation : 1kHz, 22.5kHz deviation

Output level : 1mV (more than 60dB)

TP (ANT)

0.01

1-676-002-

C101

C102

R106

R105 R109

R119

R120

R111

R107

R102

R108

R101

R104

R103

C103 C124

C105

C104

C125

CF1

BPF101

CF2

D101

D102

BCE

Q104

Q101

Q105

ECB

(ANT)

(LPF)

digital

voltmeter

(ANT)

[MAIN BOARD]

(SIDE A)

TP (LPF)

IC101

C114

C115

C113

109

108

R121

R115

12 R113 R114

C111

C110

C107 C116

C112

CF3

(19kHz)

frequency counte

TP (19kHz)

F/50V

[MAIN BOARD] (SIDE A)

0 dB=1µV

Adjustments Location :

CT2 : FM Frequency Coverage

Adjustment

CT1 : FM Tracking Adjustment

T1 : FM IF Adjustment

RV1 : FM Stereo (19kHz) Adjustmen

[MAIN BOARD] (SIDE A)

– 6 –

SECTION 4

DIAGRAMS

4-1. EXPLANATION OF ICTERMINALS

IC301 µPD17015GS-556-GJG (SYSTEM CONTROL, LCD DRIVE)

Pin No. Pin name I/O Description

1 POB2 I Key return input.

2 PCO0 O Key source output.

3 PCO1 O Key source output.

4 PCO2 I Power (AUTO OFF) key input.

5 PCO3 I HOLD key input.

6 POD0/BEEP O Beep output.

7 POA0 I Key return input (Fixed at “L”).

8 POA1 I Voltage decrease information input. E: On-and-off

9 POA2 O Power ON/OFF output. “H” : ON

10 POA3 O Mute signal output. “H” : Mute ON

11 CE I Voltage decrease information input. E: Lighting

12 XOUT O System clock output (75 kHz).

13 XIN I System clock input (75 kHz).

14 VDD — Power supply.

15 GND — Ground.

16 EO O PLL error output.

17 VREG O Voltage regulator output.

18 VCOH I FM VCO input.

19 VCOL — Not used (OPEN).

20 – 28 LCD 0 – 8 O LCD segment output.

29 – 32 COM 0 – 3 O LCD common output.

33 VLCD1 — Power supply for LCD drive.

34 CAP1 — Connecting pins of the capacitor for LCD drive voltage.

35 CAP0

36 VLCD0 — Power supply for LCD drive.

37 POB0 I Key return input.

38 POB1

– 7 – – 9 –– 8 –

SRF-M55

• Signal path.

F: FM

4-2. BLOCK DIAGRAMS

23 4 5 6 7 89 10 11 12

[MICROCOMPUTER BOARD]

(SIDE B)

[MICROCOMPUTER BOARD]

(SIDE A) [MAIN BOARD] (SIDE B) [MAIN BOARD] (SIDE A)

(11)

1-676-003- 11

(11)

1-676-003-

(11)

1-676-002- 11

(11)

1-676-002-

C302

C326

C320

C321

C316

C318

C323

C317

C203

R332

R301

R321

R334

R306

R316

R317

R311

R310

R309

R312

R204

R202

R302

R304

R331

R330

R333

R305

R318

R303

R319

R320

R313

R308

R307

R203

R205

C206

R206

R201

C324

C305

C303

C304

C327

C328

C311

C315

C314

C319

C202

C204

C205

S202

POWER

(AUTO OFF)

S201

HOLD

S203

MODE

IC201

IC302

IC202

C201

X201

CN201

CN202

510

LCD201

LIQUID

CRYSTAL

DISPLAY

S205(JOG)

19 20

IC301

ECB ECB

Q305Q304

C312 C313

L304

D301

D306

D305

D303

C329

L303

T301

C301

Q301 Q307

ECB

Q308

ECB

Q306

Q310

RV2

\VOL\∑

C27

C29

C26

C1 C18

C23

C22

C21

C20

R30

R8 R99

C10

R98

R97

R96

C24

C16

C17

C19

C15

C13

C14

C25

C11

IC3

157

14 10 8

IC2

C28

C12

RV1

CT1

FM SENS

LOCAL

GROOVE

MEGA BASS

OFF

CT2

IC1

CN1

510

DRY BATTERY

SIZE "AAA"

(IEC DESIGNATION R03)

1PC, 1.5V

EP1

C120

C119 C122

C121

R118

R116 R117

R123

R122

C123

BE C

Q103

IC101

C114

C115

C113

C109

C108

C106

C101

C102

R106

R105 R109

R119

R121

R115

R124

R120

R111

R107

R102

R108

R101

R104

R103

R110

R112 R113 R114

C103 C124

C105

C104

C111

C125

C110

C107 C116

C112

BCE

Q102

CF1

CF3

BPF101

CF2

D101

D102

BCE

Q104

Q101

Q105

ECB

(ANT)

(19kHz)

(LPF)

S202

-1

-2

BATT2

LITHIUM

BATTERY

BCE

– 10 – – 12 –– 11 –

SRF-M55 4-3. PRINTEDWIRING BOARDS

Note on Printed Wiring Boards:

Note:

•X: parts extracted from the component side.

•r:Through hole.

•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.

D101 F-11

D102 F-11

D301 F-4

D303 F-4

D305 D-5

D306 D-5

IC1 F-8

IC2 D-8

IC3 C-5

IC101 E-12

IC201 D-3

IC202 D-3

IC301 C-5

IC302 E-5

Q101 F-12

Q102 E-11

Q103 B-12

Q104 G-12

Q105 G-12

Q301 G-5

Q304 D-4

Q305 D-4

Q306 F-5

Q307 G-5

Q308 F-5

Q310 F-5

Ref. No. Location

rSemiconductor

Location

Note on 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 1/4W or less unless otherwise

specified.

•U: B+ Line.

•H: adjustment for repair.

• Power voltageis dc 1.5V and fedwith regulated dc power

supply from battery terminal.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

no mark : FM

• Voltages aretaken with aVOM(Inputimpedance10 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

– 13 – – 15 –– 14 –

SRF-M55

4-4. SCHEMATIC DIAGRAM

rWAVEFORMS

Q301-2 C

VOLT/DIV : 1 V AC

TIME/DIV : 0.1 µsec

T301

IC301 qs

XOUT

IC302 5

VOLT/DIV : 1 V AC

TIME/DIV : 0.2 µsec

VOLT/DIV : 0.1 V AC

TIME/DIV : 5 µsec

VOLT/DIV : 0.5 V AC

TIME/DIV : 5 µsec

4.6Vp-p

360 nsec

5.2Vp-p

982 nsec

330mVp-

75kHz

2.9 Vp-p

sec

rRefer to page 10 for Notes. rRefer to page 16 for IC Block Diagrams.

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