Sony TA-FB720R Manual de usuario

– 1 –

MICROFILM

AEP Model

SPECIFICATIONS

SERVICE MANUAL

INTEGRATED STEREO AMPLIFIER

TA-FB720R/FB820R

Photo :TA-FB820R

– 2 –

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK !OR DOTTED LINE

WITH MARK !ON THE SCHEMATIC DIAGRAMS AND IN

THE PARTS LIST ARE CRITICAL TO SAFE OPERATION.

REPLACE THESE COMPONENTS WITH SONY PARTS

WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS

MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

TABLE OF CONTENTS

1. GENERAL ..........................................................................3

2. ELECTRICAL ADJUSTMENT ..................................... 4

3. DIAGRAMS

3-1. Circuit Boards Location ........................................................5

3-2. Schematic Diagram – Input Section – .................................. 7

3-3. Printed Wiring Board – Input Section – ................................9

3-4. Schematic Diagram – Main Section – ................................ 11

3-5. Printed Wiring Board – Main Section – ..............................13

3-6. Schematic Diagram – Panel Section – ................................15

3-7. Printed Wiring Board – Panel Section – ............................. 17

3-8. Schematic Diagram – Power Section –............................... 19

3-9. Printed Wiring Board – Power Section – ............................21

3-10. IC Block Diagrams............................................................23

3-11. IC Pin Function ................................................................. 24

4. EXPLODEDVIEW

4-1. Case and Back Panel Section ..............................................25

4-2. Front Panel Section .............................................................26

4-3. Chassis Section ................................................................... 27

5. ELECTRICAL PARTS LIST ........................................28

– 3 –

Front Panel Descriptions

SECTION 1

GENERAL

1PROTECTION indicator

2U(Power) button

3Remote sensor

4TAPE 1/DAT indicator

5TAPE 2/MD indicator

6AUX indicator

7CD indicator

8TUNER indicator

9PHONO indicator

10 INPUT SELECTOR knob

11 VOLUME knob

12 SUBSONIC button

13 SOURCE DIRECT button and indicator

14 LOUDNESS button

15 TAPE MONITOR knob

16 BALANCE knob

17 TREBLE knob

18 BASS knob

19 SPEAKERS knob

20 PHONE jack

21 EON LINK button

This section is extracted from

instruction manual.

1978465

13 12141516171819

– 4 –

SECTION 2

ELECTRICAL ADJUSTMENT

Bias Adjustment

NOTE:

1. Perform the adjustment after the unit has warmed up sufficiently.

2. Perform the bias adjustment if the power transistor has been

replaced.

Procedure:

1. Rotate fully the bias adjusting semi-fixed resistors (RV500,

RV600) to the MIN position (counterclockwise).

2. Connect a digital voltmeter to the CN500 and CN600.

3. Set the slide regulator to 0V, and press the Ubutton (ON) on

the set.

4. Raise graduallythe slideregulatorvoltage up to the ratedvoltage.

5. At this time,confirm that the SP relay is turned on (it will click).

6. Adjust the RV500 and RV600 so that a reading of digital

voltmeter is 10 ± 0.1 mV.

7. Return the slidack to 0V, and press the Ubutton (OFF) on the

set.

Adjustment Location :

[MAIN BOARD] – COMPONENT SIDE –

1 pin 3 pin

–

CN500 (L-CH)

CN600(R-CH)

CN600 (R-CH)

CN500 (L-CH)

RV600

Bias (R-CH)

RV500

Bias (L-CH)

DIGITAL

VOLTMETER DIGITAL

VOLTMETER

– 5 – – 6 –

SECTION 3

DIAGRAMS

3-1. CIRCUIT BOARDS LOCATION THIS NOTE IS COMMON FOR PRINTEDWIRING

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.

•¢: internal component.

•2: nonflammable resistor.

•5: fusible resistor.

•C: panel designation.

For printed wiring boards.

Note:

•X: parts extracted from the component side.

•Y: parts extracted from the conductor side.

•b: Pattern from the side which enables seeing.

•U: B+ Line.

•V: B– Line.

•H: adjustment for repair.

• Voltages and waveforms are dc with respect to ground

under no-signal (detuned) conditions.

no mark : POWER ON

• Voltages aretakenwith aVOM(Input impedance 10 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:TUNER

WAVEFORM

IC902 1XOUT

Note: The components identified by mark !or dotted line

with mark !are critical for safety.

Replace only with part number specified.

• Indication of transistor

CThese are omitted

4MHz

3.8Vp-p

PANEL board

INPUT board

MAIN board

SP-TM board

PHONO board

PS board OUTLET board

VOL board

SIRCS board

SIRCS SUB board

HP board

SP-SW board

– 7 – – 8 –

TA-FB720R/FB820R

3-2. SCHEMATIC DIAGRAM – INPUT SECTION –

• See page 23 for IC Block Diagrams.

(Page 15)

(Page 12)

– 9 – – 10 –

TA-FB720R/FB820R

3-3. PRINTED WIRING BOARD – INPUT SECTION –

• See page 5 for Circuit Boards Location.

Ref. No. Location

• Semiconductor

Location

D101 B-7

D102 B-8

D133 C-9

D140 B-4

D240 B-4

IC101 B-9

Q101 C-7

Q102 C-7

Q103 C-8

Q140 C-4

Q240 B-4

(Page 18) (Page 17)

(Page 13)

– 11 – – 12 –

TA-FB720R/FB820R

3-4. SCHEMATIC DIAGRAM – MAIN SECTION –

• See page 23 for IC Block Diagrams.

(Page 16)

(Page

20)

(Page

15)

(Page 8)

(Page 20)

– 13 – – 14 –

TA-FB720R/FB820R

3-5. PRINTED WIRING BOARD – MAIN SECTION –

• See page 5 for Circuit Boards Location. Ref.No. Location

• Semiconductor

Location

D500 C-10

D501 C-10

D502 C-10

D503 E-11

D504 E-10

D505 E-10

D506 D-9

D511 E-2

D512 E-2

D513 F-3

D600 G-10

D601 G-10

D602 G-10

D603 E-11

D604 E-10

D605 E-10

D606 F-9

D700 A-1

D701 A-1

D702 A-1

D703 G-4

D720 E-7

D721 E-7

IC700 B-2

Q500 C-11

Q501 C-11

Q502 C-10

Q503 D-11

Q504 D-10

Q505 D-10

Q506 E-11

Q507 E-10

Q508 D-9

Q509 D-8

Q510 D-8

Q511 C-5

Q512 C-8

Q513 D-6

Q600 G-11

Q601 G-11

Q602 G-10

Q603 F-11

Q604 F-10

Q605 F-10

Q606 E-11

Q607 E-10

Q608 F-9

Q609 F-8

Q610 F-10

Q611 G-8

Q612 G-5

Q613 F-6

Q700 B-3

Q701 B-1

Q702 G-4

(Page 22)

(Page 10)

(Page 22)

(Page 18)

(Page 17)

– 15 – – 16 –

TA-FB720R/FB820R

3-6. SCHEMATIC DIAGRAM – PANEL SECTION –

• See page 5 forWaveforms.

• See page 23 for IC Block Diagram.

• See page 24 for IC Pin Function.

(Page 8)

(Page 12)

(Page 7)

(Page

11)

(Page 11)

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