Sony XM-7527 X-Plod Manuale utente

MICROFILM

XM-7527

US Model

Canadian Model

AEP Model

UK Model

E Model

SPECIFICATIONS

SERVICE MANUAL

STEREO POWER AMPLIFIER

TABLE OF CONTENTS

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

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

3. DISASSEMBLY

3-1. Side Plate and Bottom Plate.................................................. 7

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

4. ELECTRICAL ADJUSTMENT .................................... 8

5. DIAGRAMS

5-1. Block Diagram – Amplifier Section – .................................. 9

5-2. Block Diagram – Power Section – ...................................... 10

5-3. IC Block Diagram ............................................................... 11

5-4. Printed Wiring Board – Filter/Amplifier Section –............. 12

5-5. Schematic Diagram – Filter/Amplifier Section – ............... 13

5-6. Printed Wiring Board – Power Section – ............................ 14

5-7. Schematic Diagram/Printed Wiring Board

– LED/Power Section – ...................................................... 15

6. EXPLODEDVIEWS

6-1. Plate and Cover Section ...................................................... 16

6-2. Board and Heat Sink Section .............................................. 16

7. ELECTRICAL PARTS LIST ........................................ 17

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 JW065 of the amplifier board.

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

is set to HI-CURRENT :

Cut the jumper wire JW066 of the amplifier board.

2. Clearing the OFF SET protector

• Cut the jumper wire JW024 of the amplifier board.

3. TESTTONE Function

1Press the TESTTONE button (S805/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:

VR201 VR101

JW066JW065

JW024

S805

TEST TONE

- 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 BOTTOM PLATE

3-2. AMPLIFIER/POWER BOARD AND LED BOARD

Two screws

(BTP3x8)

Two screws

(BTP3x8)

Screw

(BTP3x8)

Filter board

Three screws

(BTP3x8)

Two screws

(BTP3x8)

!¢

Two screws

(M4)

Bottom plate

Heat sink block

!§

Auto fuse (F901)

!¶

Auto fuse (F902)

Side panel (L)

!£

Side panel (R)

!™

Screw (BTP3x8)

Screw (BTP3x8

)

Screw (BTP3x8)

!¡

Screw (BTP3x8)

!∞

Cover

Two screws

(P4X40)

Three screws

(P3X8)

!£

Two insulating sheets

(AMP)

!™

Sub heat sink

(Amplifier)

!¡

Three screws

(P3X6)

Two screws

(P3X14)

Three screws (BVTP3X14)

Screw (BTP3X8)

Three screws (BTP3x12)

Screw (BVTP3X10)

Retainer

Power board

Amplifier board

!¢

Two screws (BTP 2x10)

!∞

LED board

!§

LED holder

SECTION 4

ELECTRICAL ADJUSTMENTS

Idling Current Adjustment

• Perform adjustments in the HI-VOLTAGE mode.

1Adjustment point

Semi-fixed resistors VR101, VR201 of amplifier board.

2Precautions on adjustments

1. Set the RCA input terminal to open.

2. Apply a voltage of 14.4Vbetweenthe+12Vterminal,REMOTE

terminal, and GND terminal.

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

terclockwise direction while observing the component side.

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

in 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

Rotatingthesemi-fixedresistorin the counterclockwisedirection:

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 .

L channel :

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

fier board

R channel :

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

fier board

Digital voltmete

TP101(L-CH)

TP201(R-CH)

TP102(L-CH)

TP202(R-CH)

- AMPLIFIER BOARD - (Component side)

Adjustment Location

Connection :

IDLING

(R-CH) VR201 VR101 (L-CH)

TP202

TP201

TP102

TP101

XM-7527

SECTION 5

DIAGRAMS

5-1. BLOCK DIAGRAM – AMPLIFIER SECTION –

5 7 6 7

12 12

11 11

5 7 6 7 6 7 5

DIFFERENTIAL

AMP

Q104,106

DIFFERENTIAL

AMP

Q103,105

POWER AMP

(VOLTAGE STAGE)

Q108

BIAS

VR101

OVERLOAD

Q112,113

OVERLOAD

Q114-115

OFFSET

DET

Q812-814

CNJ805

CNP804

POWER AMP

(VOLTAGE STAGE)

Q107

POWER AMP

(FINAL STAGE)

Q110-111

NFB ON

NFB OFF

RY801(1/2)

DIRECT

SW802(1/2)

LINE SWITCH

Q102

LINE SWITCH

Q101

LOWBOOST

IC102(1/2)

LOWBOOST

IC102(2/2)

POWER

DRIVE

Q942

THERMAL

DET

TH803

POWER

CONTROL

Q941

INVERTER

Q943

R-CH R-CH

CN807

SPEAKER OUT

ON OFF

PRE AMP

IC801(1/2) H.P.F

IC802(1/2)

H.P.F

IC101(2/2)

IC201(2/2) L.P.F

IC803

L.P.F

IC101(1/2)

IC201(1/2)

LEVEL

VR801(1/2) FILTER

VR804 FILTER

VR804

CNP806

CNJ806

CNJ806 CNP806HPF

LPF

FLAT

INVERTER

Q944

B+

B-

T902 D942

D944

D946

D948

D947

D945

D943

D949

R-CH

L-CH

POWER

BOARD

CNB804

FILTER BOARD

AMPLIFIER BOARD

TEST TONE AMP

IC804(1/2) TEST TONE AMP

IC804(2/2)

FILTER

ON OFF

B+

SW803

L+R MONO

INPUT

(M0N0)

OUTPUT

(THROUGH)

INPUT

OUTPUT

(THROUGH)

257

TEST TONE

S805

NFB

S804

VR802

(2/4) VR802

(1/4)

BOOST/LOWCUT

FREQ

VR802

+28V

POWER

BOARD

B+

-28V

B-

• Signal path

: Audio

XM-7527

5-2. BLOCK DIAGRAM – POWER SECTION –

CNB804

CNJ802

CNJ801

AMPLIFIER

BOARD

CNP804

GND

REMOTE

CNP803

POWER BOARD

OFFSET CONTROL

Q805-806 OFFSET LED

SWITCH

Q811

THERMAL DETECTOR

TH801

THERMAL DETECTOR

TH802

B+ SWITCH

Q904

B+ SWITCH

Q902

THERMAL

CONTROL

Q801

THERMAL

SWITCH

Q802

THERMAL

LED SWITCH

Q809

REF-REG

THERMAL SWITCH

TH901,Q915

DRIVER

Q906 INVERTER

Q910,912,914

DRIVER

Q905

INVERTER

Q909,911,913

T901

SWITCHING

CONTROL

Q907-908

F902 (25A)

F901 (25A)

S801

HI-VHI-C

+28V

-28V

AMPLIFIER

BOARD

D904

D903

IC902

DC DET

IC903

DC SWITCH

DC-DC

CONVERTER

IC901

OVER CURRENT

CONTROL

Q807-808

OVER CURRENT

LED SWITCH

Q810

D803

D806

D802

S801

MODE

HI-C HI-V

S801

D905

D906

HI-V

HI-C

D845

HI-VOLTAGE D844

HI-CURRENT

D843

OVER CURRENT

1 7

GGR

D842

OFFSET

D841

THERMAL

B+

Q843

SWITCH Q842

SWITCH Q841

SWITCH

CNB803

LED BOARD

MODE

+12V

B+ SWITCH

Q903

POWER ON/OFF

D901,Q901 REGULATOR

D804,Q803-804

B+

B-

1 4

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