Sony ST-SP55 Service Manual

ST-SP55

SERVICE MANUAL

ST-SP55 is the tuner section

in CMT-SP55MD or CMT-SP55TC.

AEP Model

UK Model

E Model

SPECIFICATIONS

FM stereo, FM/AM superheterodyne tuner

Input
AUX IN (phono jacks):	voltage 250 mV, impedance
	47 kilohms
Output
AUX OUT (phono jacks):	voltage 250 mV, impedance
	1 kilohm

FM tuner section

Tuning range	87.5	– 108.0 MHz
	(50 kHz step)
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
	(with the interval set at 9 kHz)
Other models:	531 – 1,602 kHz
	(with the interval set at 9 kHz)
	530 – 1,710 kHz
	(with the interval set at 10 kHz)
Aerial	AM loop aerial
	External aerial terminals
Intermediate frequency	450 kHz

General

Dimensions (w/h/d) incl. projecting parts and controls Approx. 202 × 75 × 291 mm

Mass	Approx. 1.3 kg

Design and specifications are subject to change without notice.

MICRO Hi-Fi COMPONENT SYSTEM

1

SECTION 3 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 1/4 W or less unless otherwise specified.

•f : internal component.

•C: panel designation.

Note:

The components identified by mark 0or dotted line with mark 0are critical for safety.

Replace only with part number specified.

•U : B+ Line.

•V : B– Line.

•H: adjustment for repair.

•no mark : FM

: Can not be measured.

•Voltages are taken with a VOM (Input impedance 10 MΩ ). Voltage variations may be noted due to normal production tolerances.

•Waveforms are taken with a oscilloscope.

Voltage variations may be noted due to normal production tolerances.

•Circled numbers refer to waveforms.

•Signal path.

F : FM

J : CD d : TAPE

G: REC (TAPE/MD)

j: MD

•Abbreviation

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

For printed wiring boards.

Note:

•X: parts extracted from the component side.

•Y: parts extracted from the conductor side.

•a : Through hole.

•b: Pattern from the side which enables seeing.

(The other layers' patterns are not indicated.)

•Indication of transistor

		C
		Q									These are omitted
B E

BC E

These are omitted

• WAVEFORMS

– MAIN BOARD –

1 IC701 qa XCOUT

2.7Vp-p

30.5 sec

2 IC701 qd XOUT

4.6Vp-p

100nsec

3-1. CIRCUIT BOARDS LOCATION

tuner unit (FM/AM)

PIN JACK board

LED board

MAIN board

PANEL board

4

ST-SP55

3-2. BLOCK DIAGRAM

		ST MUTE
FM 75Ω	TUNER	RDS INT
	UNIT	RDS DATA
		STEREO
G		TUNED
		ST CE
AM		ST DOUT
		ST DIN
		ST CLK

CN203(1/2)

	REC L	6
	REC R	8			R-CH
	MD-L	4
					R-CH
SYSTEM	MD-R	2
CONTROL	TC-L	5
3
TO TC-SP55/	TC-R	1			R-CH
MDS-SP55

		IC401
	INPUT SELECT/EVR
		10	9
		LSELO	LIN
ST-L		L1			LOUT
	14				5
MD-L	13	L2
CD-L	12	L3
SEL-L	11	L4
		CONTROL
			DI	CL	CE
			1	30	2

18 20 21 23 24		25 26 27 28		75 74 73
ST MUTE RDS INT RDS DATA	STEREO TUNED	ST CE	ST DOUT ST DIN ST CLK	VOL-DATA VOL-CLK VOL-LAT

IC231
BUFFER
3	1
	S923
	TUNING
	MODE
	S922
S910	TUNER/
	BAND
DISPLAY	S921
	TUNING
	–
	S920
	TUNING
	+
	90
	KEY1

	PDOWN	11	PDOWN
			PCPON
	PCPON	10
			DATA
	IIC-DATA	14
			CLK
	IIC-CLK	12
						IC202
						INPUT SELECTOR
		J210(1/2)
	L			AUXH-L	12	X0	X 13
				AUXL-L	14	X1
				TC-L	15	X2
	AUX IN				11	X3
	R		R-CH			CONTROL	A 10
							B	9
							INH	6
		CN205
	CD L	1
	CD R	3	R-CH
	CDKEY	5	CD-KEY
			LED0
	PLAY LED	6
			LED1
	PAUSE LED	7
			CD-DATA
	DATA	8
			CD-XLAT
	XLAT	9
			CD-CLK
SYSTEM	CLOK	10
			HOLD
	HOLD	11
CONTROL
			SQSO
2	SQSO	12
			SENS
(TO CDP-SP55)	SENS	13
			SQCK
	SQCK	14
			SCOR
	SCOR	15
			CDM-SW	CD-PWR
	CD MSW	16
			LOAD-IN
	LOAD-IN	17
			LOAD-OUT
	LOAD-OUT	18
	UNREG(L)	19		+ UBREG(L)			+5V
	+5V	4						+5V
						SWITCH
09						Q281,282

85 P-DOWN OUT

67 PCPON

30 IIC-DAT 29 IIC-CLK

IC701

MASTER

CONTROL

61 FUNC1

PAUSE-LED

-PLAYLED XLT-CD SENSE

LOAD-IN

LOAD-OUT

POWER-BD

CLK-CD

DATA-CD

HOLD-LPC

SQCLK

SQDATA SCOR -CDMSW

KEY3

PWRDP

DIMMERBL

DATADP

CLKDP

CSDP

58

FUNC INHIBIT

60

FUNC2

44 43 42 41 40 39 38 37

35 34 33 32 19 95

92

84

4

1

2

3

LED1

LED0 CD-XLAT SENS

LOAD-OUT

LOAD-IN

CD-POWER

CD-CLK

CD-DATA HOLD

SQCK

SQSO SCOR CDM-SW

CD-KEY

Q701,702

ILL(-7V)

Q705,706

D950-957

BACK

LED

LIGHT

DRIVE

–7V

DATA

6

DPDATA

DPCLK

SCK

5

DPCS

STB

4

LCD

DISPLAY

UNIT

VDD

1

+5V

B+

+5V

SWITCH

Q704

VREF

3

89

KEY0

DP PWR

83

IC901

REMOTE

COMMANDER

RECEIVER OUT 1

88 SIRCS

				+10V
				-7V
				+7V
+5V		3		IC283	1
				+5V REG.

+UNREG(L)

		J210(2/2)
			L
			AUX OUT
Q221	R-CH		R
MUTE
		CN201
		8	L
	R-CH	6	R

Q201

51
-MUTE AUX	DSG-OFF 72		DSG-OFF	17	DSG-OFF
RO			XPRE-MUTE
	PRE-MUTE 76			11	XPRE-MUTE
			HP-MUTE
	HP-MUTE 77			10	HP-MUTE
			ON/STBY
	TA-STANDBY 78			13	ON/STBY/AMP-MUTE
			P-RELAY
	PWR-RELAY 79			9	P-RELAY
			S-RELAY
	SP-RELAY 80			12	XS-RELAY
			ENC0
	VOL-ENC-A 86			15	ENC0
			ENC1
	VOL-ENC-B 87			16	ENC1
			TA-KEY
	KEY2 91			14	TA-KEY/HPSW

		+5V	4	+5.6V(UNSW)
	Q291		5	+13.5V(REG)
	+10V REG
3	IC282	2	1	-UNREG
	-7V REG.
3	IC281	1	3	+UNREG(L)
	+7V REG.
	Q301		CN203(2/2)
	+11V REG.		17	+UNREG(L)
			16	-UNREG(L)
			19	+UNREG(H)
			15	D+5.6V(UNSW)

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

5 5

ST-SP55
3-3. SCHEMATIC DIAGRAM – MAIN SECTION –
	(Page 8)
	PIN FUNCTION
(Page 8)
(Page 8)
6	6

3-4. PRINTED WIRING BOARD – MAIN SECTION –

(Page 9)

(Page 9)

AEP,UK,AED

(Page 9)

7 7

ST-SP55

• 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

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