Sony ST-SP55 Service Manual

ST-SP55

q

SERVICE MANUAL

ST-SP55 is the tuner section in CMT-SP55MD or CMT-SP55TC.

SPECIFICATIONS

FM stereo, FM/AM superheterodyne tuner Input AUX IN (phono jacks): voltage 250 mV, impedance

Output AUX OUT (phono jacks): voltage 250 mV, impedance

FM tuner section

Tuning range 87.5 – 108.0 MHz

Aerial FM lead aerial Aerial terminals 300 ohms unbalanced Intermediate frequency 10.7 MHz

AM tuner section

Tuning range European model: 531 – 1,602 kHz

Other models: 531 – 1,602 kHz

Aerial AM loop aerial

Intermediate fre

47 kilohms

1 kilohm

(50 kHz step)

(with the interval set at 9 kHz)

(with the interval set at 9 kHz) 530 – 1,710 kHz (with the interval set at 10 kHz)

External aerial terminals

uency450 kHz

General

Dimensions (w/h/d) incl. projecting parts and controls

Mass

Design and specifications are subject to change without notice.

Approx. 202 × 75 × 291 mm

Approx. 1.3 kg

AEP Model

UK Model

E Model

MICRO Hi-Fi COMPONENT SYSTEM

1

SECTION 3

d

DIAGRAMS

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this, the necessary note is printed in each block.)

For schematic diagrams.

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 Ω and 1/ specified.

f

•

• C : panel designation.

• U : B+ Line.

• V : B– Line.

• H : adjustment for repair.

• no mark : FM

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

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path.

• Abbreviation

: internal component.

Note:

The components identified by mark 0 or dotted line with mark 0 are critical for safety. Replace only with part number specified.

: Can not be measured.

∗

Voltage variations may be noted due to normal production tolerances.

F : FM J : CD d : T APE G : REC (TAPE/MD) j : MD

MY : Malaysia model. SP : Singapore model. HK : Hong Kong model. KR : Korea model. AED : North European model.

4

W or less unless otherwise

• W AVEFORMS

– MAIN BOARD –

1

IC701 qa XCOUT

2.7Vp-p

30.5µsec

2

IC701 qd XOUT

4.6Vp-p

100nsec

3-1. CIRCUIT BOARDS LOCATION

tuner unit (FM/AM)

For printed wiring boards.

Note:

• X : parts extracted from the component side.

• Y : parts extracted from the conductor side.

a

•

• b : Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

: Through hole.

• Indication of transistor

C Q

These are omitte

EB

C

EB

These are omitted

4

PIN JACK boar

LED board

PANEL board

MAIN board

3-2. BLOCK DIAGRAM

FM 75Ω

CN203(1/2)

REC L

6

8

REC R

MD-L

4

2

PDOWN

PCPON

IIC-DATA

IIC-CLK

AUX IN

CDKEY

PLAY LED

PAUSE LED

CD MSW

LOAD-IN

LOAD-OUT

UNREG(L)

MD-R

TC-L

TC-R

CD L

CD R

DATA

XLAT CLOK HOLD SQSO SENS SQCK SCOR

+5V

J210(1/2)

L

R

5

1

11 10 14 12

CN205

1

3

CD-KEY

5

LED0

6

LED1

7

CD-DATA

8

CD-XLAT

9

CD-CLK

10

HOLD

11

SQSO

12

SENS

13

SQCK

14

SCOR

15

CDM-SW CD-PWR

16

LOAD-IN

17

LOAD-OUT

18 19

4

SYSTEM

CONTROL

3

TO TC-SP55/

MDS-SP55

SYSTEM

CONTROL

2

(TO CDP-SP55)

09

AM

G

R-CH

PDOWN PCPON DATA CLK

R-CH

TUNER

UNIT

ST MUTE

RDS INT

RDS DATA

STEREO

TUNED

ST CE

ST DOUT

ST DIN

ST CLK

AUXH-L AUXL-L

TC-L

+ UBREG(L)

INPUT SELECTOR

X0

12

X1

14

X2

15

X3

11

IC202

CONTROL

X

A B

INH

+5V

SWITCH

Q281,282

ST-SP55

J210(2/2)

L

R

8

L

6

R

DSG-OFF

17 11

XPRE-MUTE HP-MUTE

10

ON/STBY/AMP-MUTE

13

P-RELAY

9

12

XS-RELAY

15

ENC0

16

ENC1

TA-KEY/HPSW

14

+5.6V(UNSW)

4

5

+13.5V(REG)

1

-UNREG

3

+UNREG(L)

17

-UNREG(L)

16

19

+UNREG(H)

15

D+5.6V(UNSW)

AUX OUT

SYSTEM

CONTROL

1

(FROM TA-SP55)

• R-ch is omitted due to same as L-ch.

• Signal Path

: FM : CD

: MD : TAPE : REC (TAPE/MD)

SYSTEM

CONTROL

3

TO TC-SP55/

MDS-SP55

IC401

INPUT SELECT/EVR

ST-L L1

14

L2

MD-L

13

L3

CD-L

12

SEL-L

13

10

9

6

+5V

L4

11

18

ST MUTE

85

P-DOWN OUT

67

PCPON

30

IIC-DAT IIC-CLK

29

61

FUNC1

60

FUNC2

58

FUNC INHIBIT

20

RDS INT

21

RDS DATA

10 9

LSELO LIN

LOUT

5 3 1

CONTROL

DI

CL

CE

1 30 2

75

74

ST CLK

LOAD-IN

LOAD-OUT

73

VOL-CLK

VOL-DATA

CD-POWER

VOL-LAT

CD-CLK

BACK

LIGHT

DATA

SCK STB

VDD

VREF

SQCK

HOLD

CD-DATA

ILL(-7V)

DPDATA

6

DPCLK

5

DPCS

4

1

3

23

STEREO

24

28

27

26

25

ST CE

TUNED

ST DIN

ST DOUT

PAUSE-LED43PLAY-LED42CD-XLT41SENSE40LOAD-IN39LOAD-OUT38BD-POWER37CD-CLK35CD-DATA34LPC-HOLD33SQCLK32SQDATA19SCOR95CDM-SW92KEY3

44

LED1

LED0

SENS

CD-XLAT

D950-957

LCD

DISPLAY

UNIT

SQSO

SCOR

+5V

IC231

BUFFER

S910

DISPLAY

CDM-SW

CD-KEY

Q701,702 Q705,706

LED

DRIVE

–7V

B+

SWITCH

Q704

90

KEY1

IC701

MASTER

CONTROL

DP PWR

BL DIMMER

84 4

+5V

S923

TUNING

MODE

S922

TUNER/

BAND

S921

TUNING

–

S920

TUNING

+

DP DATA

1 2

DP CLK

DP CS

3

DP PWR

83

89

KEY0

IC901

REMOTE

COMMANDER

RECEIVER

+UNREG(L)

+5V

OUT

1

88

SIRCS

IC283

3 1

+5V REG.

+10V

-7V

+7V

Q201

51

DSG-OFF

RO-MUTE AUX

PRE-MUTE

HP-MUTE

TA-STANDBY

PWR-RELAY

SP-RELAY

VOL-ENC-A VOL-ENC-B

KEY2

Q291

+10V REG

IC282

3 2

-7V REG.

IC281

3 1

+7V REG.

Q301

+11V REG.

Q221

MUTE

72 76 77 78 79 80

86 87

91

+5V

DSG-OFF XPRE-MUTE HP-MUTE ON/STBY P-RELAY S-RELAY

ENC0 ENC1

TA-KEY

R-CH

CN201

R-CH

CN203(2/2)

5

ST-SP55

3-3. SCHEMATIC DIAGRAM – MAIN SECTION –

(Page 8)

PIN FUNCTION

(Page 8)

6

3-4. PRINTED WIRING BOARD – MAIN SECTION –

ST-SP55

(Page 9)

• Semiconductor

Location

Ref. No. Location D201 D-5

D282 E-6 D283 G-6 D291 E-4 D301 F-5 D701 F-3 D702 F-3 D731 C-2 D733 C-3

IC202 B-4 IC231 A-6 IC281 G-6 IC282 G-7 IC283 F-5 IC401 C-5 IC701 E-2 IC702 C-3

Q201 B-3 Q221 A-6 Q271 A-5 Q281 A-7 Q282 A-6 Q291 F-4 Q301 F-5 Q701 G-3 Q702 F-1 Q704 G-3 Q705 F-2 Q706 F-2 Q731 B-3

(Page 9)

AEP,UK,AED

There are a few cases that the part isn't mounted in model is printed on diagram.

7