Sony TA-F448EB Manual de usuario

MICROFILM

TA-F448EB

INTEGRATED STEREO AMPLIFIER

+11

–3

SERVICE MANUAL

AEP Model

UK Model

SPECIFICATIONS

Amplifier section

DIN power output

85 W + 85 W (4 ohms at 1 kHz)

55 W + 55 W (8 ohms at 1 kHz)

Total harmonic distortion

Less than 0.008% (at 10 W output)

Frequency response

PHONO (20 Hz – 20 kHz): RIAA equalization curve ±0.5 dB

TUNER, CD, AUX, TAPE1/DAT, TAPE2/MD: 7 Hz – 100 kHz dB

S/N (network A)

PHONO: 94 dB

TUNER, CD, AUX, TAPE1/DAT, TAPE2/MD: 105 dB

Output voltage/impedance

RECOUT: 150 mV, 1 kilohm

PHONES: 10 mW (at 8 ohms)

Speakers impedance

4 – 16 ohms, 8 – 16 ohms (SPEAKERS A + B)

Damping factor

100 (8 ohms, 1 kHz)

General

System

Poweramplifier:Pure-complementarySEPP OCLpower amplifierwith

all stages directly coupled

Preamplifier: Low-noise, equalizer amplifier

Power requirements

230 V AC, 50/60 Hz

Power consumption

180 W

Dimensions (approx.) (w/h/d)

430 ×135 ×365 mm

incl. projecting parts and controls

Mass (approx.)

6.8 kg

Design and specifications are subject to change without notice.

– 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 PUB-

LISHED BY SONY.

TABLE OF CONTENTS

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

2. DISASSEMBLY.......................................................... 5

3. ELECTRICAL ADJUSTMENTS ......................... 7

4. DIAGRAMS ................................................................. 8

4-1. Printed Wiring Boards ..................................................... 10

4-2. Schematic Diagram ......................................................... 15

5. EXPLODEDVIEWS ................................................. 19

6. ELECTRICAL PARTS LIST................................ 22

– 3 –

SECTION 1

GENERAL This section is extracted

from instruction manual.

– 4 –

– 5 –

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

CASE ASS'Y

SECTION 2

DISASSEMBLY

FRONT PANEL SECTION

two screws

(case 3 TP2)

three screws

(case 3 TP2)

two screws

(case 3 TP2)

two screws

(case 3 TP2)

case ass'y

connector

(CN201)

connector

(CN701)

connector

(CN405)

connector

(CN809)

connector

(CN104)

five screws

two screws

screw

(BVTP2.6

screw

(BVTP3

front panel section

– 6 –

INPUT BAORD, MAIN (B) BAORD

two connectors

(CN301, 302)

connector

(CN104)

three screws

Remove the INPUT board

to direction of the arrow

two connectors

(CN16, 103)

!¡

four screws (H)

two connectors

(CN401, 402)

!º

screw

connector

(CN405)

two connectors

(CN403A, 404A)

Break the soldering of

three power transformer

leads.

!º

three screws

!¢

heat sink

!£

two screws

(transistor)

!™

MAIN (B) board

!¢

heat sink

!£

two screws

(transistor)

!¡

four screws (H)

MAIN (A) BOARD

connector

(CN201)

five screws

MAIN (A) board

– 7 –

–

BIAS ADJUSTMENT

Adjustment Procedure:

1. Rotate fully the bias adjusting semi-fixed resistors (RV301 (L-

CH), RV351 (R-CH)) to the minimum position (counterclock-

wise).

2. Connect a digital voltmeter to the CN406 (L-CH) and CN407

(R-CH).

3. Set the slidack to 0VAC, and press the POWER button (ON)

on the set.

4. Raise gradually the slidack voltage up to the rated voltage (230

V AC).

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

click).

6. Adjust the RV301 (L-CH) and RV351 (R-CH) so that a reading

of digital voltmeter is from 10 mV to 20 mV.

7. Return the slidack to 0 V AC, and press the POWER button

(OFF) on the set.

pin 1pin 3

CN406 (L-CH) – +

CN407 (R-CH) + –

Connection andAdjustment Location:

[MAIN (A) BOARD]

– Component side –

[MAIN (B) BOARD] – Component side –

digital voltmeter

C372 C322

RV351

(R-CH)

RV301

(L-CH)

BIAS

Adjustment

C459 C409

CN407

SECTION 3

ELECTRICAL ADJUSTMENT

CN406

– 8 –

• IC Block Diagram

IC401 µPC1237HA

SECTION 4

DIAGRAMS

1 2 3 4 5 6 7 8

OVER LOAD DET

F/F

OFFSET DET

LATCH/

AUTORESET

MUTE

AC OFF

DET

– 9 –

• Circuit Boards Location

MAIN (B) board SP-TM board

INPUT board

MAIN (A) board

VOL board

LED-F board

SW-F board

SP-SW board

HP board

LED-P board

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