Sony XM-7547 Manuale utente

MICROFILM

XM-7547

US Model

Canadian Model

AEP Model

UK Model

E Model

SPECIFICATIONS

SERVICE MANUAL

STEREO POWER AMPLIFER

TABLE OF CONTENTS

1. SERVICE MODE ............................................................. 3

2. GENERAL .......................................................................... 4

3. DISASSEMBLY

3-1. Side Plate and Filer Board .................................................... 7

3-2. Amplifier/Power Board and LED Board .............................. 7

4. ELECTRICAL ADJUSTMENT .................................... 7

5. DIAGRAMS

5-1. Block Diagram – Amplifier Sction – .................................... 8

5-2. Block Diagram – Power Section – ........................................ 9

5-3. IC Block Diagram ...............................................................10

5-4. Printed Wiring Board – LED/Filter Section –..................... 10

5-5. Schematic Diagram – Filter/Amplifier (1/3) Section –....... 11

5-6. Printed Wiring Board –Amplifier Section –....................... 12

5-7. Schematic Diagram – Amplifier (2/3) Section –................. 13

5-8. Schematic Diagram

– Power/Amplifier (3/3)/LED Section – .............................14

5-9. Printed Wiring Board – Power Section – ............................ 15

6. EXPLODEDVIEWS

6-1. Plate and Cover Section ...................................................... 17

6-2. Board and Heat Sink ........................................................... 18

7. ELECTRICAL PARTS LIST ........................................ 19

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

SECTION 1

SERVICE NOTE

Clearing the Protector During Repairs

• OVER CURRENT : Detects overcurrent during output.

• OFF SET : Detects DC offset at the speaker terminal.

1. Clearing the OVER CURRENT protector

1When the position of the MODE switch (S801/power board)

is set to HI-VOLTAGE :

Cut the jumper wire JW535 of the amplifier board.

2When the position of the MODE switch (S801/power board)

is set to HI-CURRENT :

Cut the jumper wire JW690 of the amplifier board.

2. Clearing the OFF SET protector

• Cut the jumper wire JW502 of the amplifier board.

3. TESTTONE Function

1Press the TESTTONE button (S851/amplifier board) with the

power ON. The amplifier is normal if sound is produced from

the speaker.

2If no sound

: Problem causer by incorrect connecttion of the power supply

system or sperker system.

: The signals input by the RCAcable before the amplifier system

are abnormal.

Adjustment Location:

S851

TEST

TONE

JW535 JW690

JW502

- POWER BOARD - (Component side) - AMPLIFIER BOARD - (Component side)

S801

MODE

SECTION 2

GENERAL This section is extracted from

instruction manual.

SECTION 3

DISASSEMBLY

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

3-1. SIDE PLATE AND FILTER BOARD

3-2. AMPLIFIER/POWER BOARD AND LED BOARD

!™

CNP806 (2P)

Three screws

(BTP3x8)

Four screws

(BTP3x8)

Bottom plate

Side panel (L)

Side panel (R)

Three screws

(BTP3x8)

!¡

Auto fuse

(F901 to 904)

!£

Screw (BTP3x8)

!∞

Screw (BTP3x8)

Three screws (BTP3x8)

Two screws (BTP3x8

)

Two screws (M4

)

Cover

!§

Filter board

!¢

Fan motor block



Four screws

(BTP3x12)

Six screws

(BVTP3x14)

!™

Sub heat sink

(Amplifier)

Three screws

(P4x40)

!¡

Three screws

(P3x6)

Four screws

(P3x10)

!£

Four insulating sheets

(AMP)

Four screws

(P3x14)

Screw

(BTP3x8)

Retainers

Two screws

(BVTP3x10)

Power boar

Amplifier board

!¢

Two screws

(P2x10)

!∞

LED board

!§

LED holder

SECTION 4

ELECTRICAL ADJUSTMENT

IDLING CURRENT ADJUSTMENT

• Perform adjustments in the HI-VOLTAGE mode.

1Adjustment point

Semi-fixed resistors VR101, VR201, VR301, VR401 of ampli-

fier board.

2Precautions on adjustments

1. Set the RCA input terminal to open.

2. Apply a voltage of 14.4V between the +12Vterminal, REMOTE

terminal, and GND terminal.

3. Rotate the above semi-fixed resistors completely in the counter-

clockwise direction while observing the component side.

4. Check that the voltage at the adjustment point becomes 0 mVin

step 2.

5. Fine adjustments may be required according to the characteris-

tics of the MOS-FET used.

• When adjusting the idling current

Rotating the semi-fixed resistor in the clockwise direction:

In creases the idling current

Rotating the semi-fixed resistor in the counterclockwise direction:

Decreases the idling current

*Take note that rotating excessively in the clockwise direction

will increase the idling current suddenly.

3Approximate adjustment values

Adjust as follows so that the following voltages become

0.4 to 0.5 mV .

A channel :

Voltage between TP101 and TP102: Use VR101 of the ampli-

fier board

B channel :

Voltage between TP201 and TP202: Use VR201 of the ampli-

fier board

C channel :

Voltage between TP301 and TP302: Use VR301 of the ampli-

fier board

D channel :

Voltage between TP401 and TP402: Use VR401 of the ampli-

fier board

TP401(D-CH)

TP201(B-CH)

TP101(A-CH)

TP102(A-CH) TP202(B-CH) TP402(D-CH)

IDLING

VR401

(D-CH)

VR301

(C-CH)

IDLING

VR201

(B-CH)

VR101

(A-CH)

TP301(C-CH)

TP302(C-CH)

Digital voltmeter

TP101(A-CH)

TP201(B-CH)

TP301(C-CH)

TP401(D-CH) TP102(A-CH)

TP202(B-CH)

TP302(C-CH)

TP402

(

D-CH

)

- AMPLIFIER BOARD - (Component side)

Adjustment Location

XM-7547

SECTION 5

DIAGRAMS

5-1. BLOCK DIAGRAM – AMPLIFIER SECTION –

22 3

5 7 6 7 6 7 5

DIFFERENTIAL

AMP

Q104,106

DIFFERENTIAL

AMP

Q105,107

POWER AMP

(VOLTAGE STAGE)

Q108

BIAS

VR101,Q110

LEVEL SHIFT

Q101 OVERLOAD

Q113,115

OVERLOAD

Q114,116

5 7 6 7 5 7 6 7 6 7 5

DIFFERENTIAL

AMP

Q304,306

DIFFERENTIAL

AMP

Q305,307

LEVEL SHIFT

Q301

OVERLOAD

Q313,315

OVERLOAD

Q314,316

OFFSET

SET

Q857-861

CNJ807

CNP805

POWER AMP

(VOLTAGE STAGE)

Q109

POWER AMP

(VOLTAGE STAGE)

Q308

BIAS

VR301,Q310

POWER AMP

(VOLTAGE STAGE)

Q309

POWER AMP

(FINAL STAGE)

Q111-112

POWER AMP

(FINAL STAGE)

Q311-312

NFB ON

NFB OFF

NFB ON

NFB OFF

RY801(1/2)

RY801(2/2)

DIRECT

S806-1

DIRECT

S805-1

LINE SWITCH

Q102

LINE SWITCH

Q103

LOWBOOST

IC806-1

LOWBOOST

IC812-1

LINE SWITCH

Q302

LINE SWITCH

Q303

FAN CTL

Q852

CNP806

POWER

DRIVE

Q854

THERMAL

DET

TH851

POWER

CONTROL

Q853

FAN DRIVER

Q851

INVERTER

Q855

B-CH

D-CH

CN811

CN810

SPEAKER OUT

ON OFF

B-

B+

B-

B+

H.P.F

IC803-1 L.P.F

IC805-1

L.P.F

IC804-1

FILTER

VR805-1 FILTER

VR805-3

PRE AMP

IC807-1 H.P.F

IC808-1 H.P.F

IC809-1 L.P.F

IC811-1

L.P.F

IC810-1

LEVEL

VR802-1 FILTER

VR806-1 FILTER

VR806-3

X10-X1

FILTER

CNP808

CNJ808

CNP808

CNJ809

CNP809

CNJ809

HPF

LPF

FLAT

HPF

LPF

FLAT

LOWBOOST

VR803-1

LOWBOOST

VR804-1

CNJ806

FN801

DC FAN MOTOR

INVERTER

Q856

+45V

+15V

-15V

-45V

T851 D854

D855

D856

D857

D858

D859

D861

D860

B+

B-CH

D-CH

POWER

BOARD

CNB805

FILTER BOARD

AMPLIFIER BOARD

TEST TONE AMP

IC851-2 TEST TONE AMP

IC851-1

FILTER

S803-1

S801-1 S801-3

X10-X1

FILTER

S802-1 S802-3

S804-1

A+B MONO

C+D MONO

(MONO)

INPUT

SPEAKER OUT

TEST TONE

S851

5 7 6 7

PRE AMP

IC801-1 H.P.F

IC802-1

LEVEL

VR801-1

• Signal path

: Audio

XM-7547

5-2. BLOCK DIAGRAM – POWER SECTION –

CNB805

CN802

CNJ801

AMPLIFIER

BOARD

CNP805

BATTERY

GND

REMOTE

BATTERY

CNP804

POWER BOARD

OFFSET CONTROL

Q809-810 OFFSET LED

SET

Q804

THERMAL DETECTOR

(For H,S)

TH903

THERMAL DETECTOR

(For TRANS)

TH904

NFB

S802

SWITCH

Q901-902

SWITCH

Q904

SWITCH CTL

Q903

THERMAL

CONTROL

Q918

THERMAL

SWITCH

Q917

THERMAL

LED SWITCH

Q806

REF-REG

THERMAL SWITCH

TH905,Q919

DRIVER

Q921 INVERTER

Q924,926,928

DRIVER

Q920

INVERTER

Q925,927,929

T902

SWITCHING

CONTROL

Q922-923

REF-REG DRIVER

Q908 INVERTER

Q911,913,915

DRIVER

Q907

INVERTER

Q912,914,916

T901

SWITCHING

CONTROL

Q909-910

THERMAL SWITCH

TH902,Q906

SWITCH

Q905

D901

F903 (25A)

F904 (25A)

F901 (25A)

F902 (25A)

S801-1

HI-V

HI-C

+28V

-28V

AMPLIFIER

BOARD

+28V

-28V

AMPLIFIER

BOARD

D905

D912

D913

D906

IC903

DC DET

IC901

DC DET

DC-DC

CONVERTER

IC904

DC-DC

CONVERTER

IC902

THERMAL

DET

TH901 D904

D903

OVER CURRENT

CONTROL

Q807-808

OVER CURRENT

LED SWITCH

Q805

D908

D909

D806

D907

MUTE CONTROL

D808,Q811 MUTE SWITCH

Q812

OFFON

S801-3

MODE

HI-C HI-V

S801-4

D911

D910

MUTE ENABLER

IC813

D801

HI-VOLTAGE D802

HI-CURRENT

D803

OVER CURRENT

GG GR

D804

OFFSET

D805

THERMAL

B+

Q801

SWITCH Q802

SWITCH Q803

SWITCH

CNB804

LED BOARD

MODE

S801-2

D911

HI-V

HI-C

MODE

+12V

B +

B –

B +

B –

HI-V

HI-C

XM-7547

5-4. PRINTEDWIRING BOARD – LED/FILTER SECTION –

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 Ωand 1/4W or less unless otherwise

specified.

•C: panel designation.

•U: B+ Line.

• Powrvoltageisdc 14.4V and fed with regulateddcpower

supply from +12V and REMOTE terminals.

• Voltages and waveforms are dc with respect to ground

under no-signal conditions.

no mark: POWER ON

*: Impossible to mersure

• Voltagesare takenwithaVOM (Input impedance 10MΩ).

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:AUDIO

For printed wiring boards.

Note:

•X: parts extracted from the component side.

5-3. IC BLOCK DIAGRAM

• POWER section

IC902, 904 µPC494G2

12 3 5 6 7 8

91016 15 14 13 12 11

ERROR

0.1V

REG.

REF.

OSC

ERROR

• Semiconductor

Location

Ref.No. Location

IC803 C-3

IC804 B-3

IC805 B-2

IC809 C-5

IC810 B-6

IC811 B-6

• Semiconductor

Location

Ref.No. Location

D801 A-4

D802 A-4

D803 A-2

D804 A-3

D805 A-1

Q801 A-2

Q802 A-3

Q803 A-1

1234567

R489

R289

R387

R487

C354

JW102

R486

R383

R183

R187

R287

R286

R484

R483

R481

R482

R485

C451

R284 R282

R285

C251 R490

R382

R384

R385

C351

R389

R386

R182

R184

R185

C151

R290

R283

R281

R390

R381

R181

R186

R190

R189

IC811

IC810

IC809

IC804

IC803

IC805

JW117

1-675-246- 11

FILTER BOARD

JW104

JW103

JW105

JW106

JW107

C452

C454

JW101

S802

JW118

CNJ809

C453C455

JW119

JW120

JW111

JW110

JW109

JW116

JW115

C352

C753

C754

C357

C356

JW121

JW122

C457

C456

JW114

JW113

JW112

C355

C353

S804

VR806

JW108

JW125

JW137

C254 C154

JW138

JW129

JW130

JW123

JW124

JW128

JW131

JW139

JW140

JW141

JW142

C751

C752

JW126

JW127

JW143

JW136

JW135

JW134

JW133

JW132

C252

C157

C256

C257

C156

C153

C253 C255

C155

C152

CNJ808

VR805

S803

S801

(Page 12)

S801

FILTER

(X1 X10)

VR805

FILTER

(50Hz — 400Hz)

S803

FILTER

(LPF OFF HPF)

S804

FILTER (X1 X10)

VR806

FILTER

(50Hz — 400Hz)

S802

FILTER

(LPF OFF HPF)

AMPLIFIER BOARD

CNP808

(Page 12)

AMPLIFIER BOARD

CNP809

234

1-675-245-

LED BOARD

CNB804

RGG

D802

D801

D803

D804

D805

(Page 16)

HI-CURRENT

POWER BOARD

CNP804

BLK +B

BLU GND

BLU TH

BLU CFFS

BLU O-C

BLU H-V

BLU H-C

R815

R812R811

Q803

R814

R808

R807

R806

R805

Q802

R813

R804

R803

R802

R810 R809

R801

Q801

D804

D803

D805

THERMAL OFFSET OVER CURRENT D801

HI-VOLTAGE

POWER/PROTECTOR MODE

D802

Indice

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