Sony STR-SE381 Bedienungsanleitung

STR-SE381

US Model

SERVICE MANUAL

FM STEREO/FM-AM RECEIVER

MICROFILM

ManufacturedunderlicensefromDolbyLaboratories

Licensing Corporation.

“Dolby” “Pro Logic” and the double-D symbol aare

trademarks of Dolby Laboratories Licensing

Corporation. SPECIFICATIONS

— Continued on next page —

Audio power specifications

POWER OUTPUT ANDTOTAL HARMONIC DISTORTION

With 8-ohm load, both channels driven, from 40 - 20,000 Hz,

rated 60 watts per channel minimum RMS power, with no more

than 0.5% total harmonic distortion from 250 milliwatts to

rated output.

Amplifier section

Stereo mode (8 ohms at 40 Hz - 20 kHz less than 0.5% total

harmonic distortion)

60 W + 60W

Surround mode (8 ohms at 1 kHz, THD 0.5%)

Front: 60 W/ch

Center: (Pro Logic Mode)

60 W

Rear: 60 W/ch

Frequency response PHONO: RIAA

equalization curve ±0.5 dB

TV/DBS, CD, TAPE/MD, VIDEO INPUT

10 Hz - 50 kHz ±1 dB

Inputs

Sensitivity Impedance S/N (weighting network,

input level)

PHONO

(MM) 2.5 mV 50 Kilohms 72 dB*

(A, 2.5 mV)

CD 400 mV

TAPE/MD, 250 mV

TV/DBS, 50 Kilohms 82 dB*

VIDEO (A, 150 mV)

*78 IHF

Outputs TAPE/MD REC OUT:

Voltage: 150 mV,

Impedance: 10 kilohms

VIDEO AUDIO OUT:

Voltage: 150 mV,

Impedance: 10 kilohms

PHONES:

Accepts low and high impedance headphones

Muting Full mute

BASS BOOST +10 dB at 70 Hz

TONE ±8 dB at 100 Hz and 10 kHz

FM tuner section

Tuning range 87.5 - 108.0 MHz

Antenna terminals 75 ohms, unbalanced

300 ohms, balanced

Sensitivity Mono: 18.3 dBf, 4.5 µV

Stereo: 38.3 dBf, 45 µV

Usable sensitivity 11.2 dBf, 2 µV (IHF)

S/N Mono: 76 dB

Stereo: 70 dB

Harmonic distortion at 1 kHz Mono: 0.3%

Stereo: 0.59%

Separation 45 dB at 1 kHz +0.5

Frequency response 30 Hz - 15 kHz –2 dB

Selectivity 60 dB at 400 kHz

AM tuner section

Tuning range 531 - 1710 kHz

Antenna Loop antenna

Usable sensitivity 50 dB/m (at 1,000 kHz)

S/N 54 dB (at 50 mV/m)

Harmonic distortion 0.5% (50 mV/m, 400 kHz)

Selectivity At 10 kHz: 40 dB

STR-SE381

— 9 — — 10 —

3-3. SCHEMATIC DIAGRAM — DISPLAY SECTION — • See page 6 for Waveforms. • See page 25 for IC Pin Functions. • See page 27 for IC Block Diagrams.

STR-SE381

— 13 — — 14 —

3-5. SCHEMATIC DIAGRAM —VOLUME SECTION — • See page 7 for KEY Board Wiring Board.

STR-SE381

— 17 — — 18 —

3-7. SCHEMATIC DIAGRAM — MAIN (1/3) SECTION — • See page 27 for IC Block Diagrams.

STR-SE381

— 21 — — 22 —

3-9. SCHEMATIC DIAGRAM — MAIN (2/3), POWER SECTION — • See page 27 for IC Block Diagrams.

STR-SE381

— 23 — — 24 —

3-10. SCHEMATIC DIAGRAM — MAIN (3/3), SP SW SECTION — • See page 12 for SW Board Wiring Board. • See page 27 for IC Block Diagrams.

— 27 —

3-12. IC BLOCK DIAGRAMS

IC300 LV1016

IC301 LA2786

15 6

–

20 19 18 17 16 15 14 13

2324

2 3 4789 10 12

DEC

IN-FILTER

(40kHz)

VDD

ADM-CONT SRAM

ADM

OUT-FILTER

(7k/5k)

B-NR

DC-OUT

VOL/MUTE

S-TRIM

INV-PHASE

R+DELAY

L+DELAY

L–R

L+R

(–6dB)

A.GND

L-OUT

R-OUT

VREF

S-OUT

DELAY-OUT

S-IN

R-IN

L-IN

VCC

NR-DET

ENABLE

DATA

CLK

D.GND

DC-CUT

VDD

OSC

NR-IREF

DC-CUT

–+

NOISE

FILTER NOISE

BALANCE

CONTROL

LPF

V REF

NOISE

GENERATOR

VCA

VCAVCA

LPF

RECT RECT RECT RECT

P. S.

CMODE

MUTE

DIVIDER OSC

CONTROL

CTRIM

LOG

DIFF LOG

DIFF

DUAL T

CONTROL

L-IN

R-IN

VSS

CLK

DATA

VCC

L-OUT

R-OUT

S-OUT

C-OUT

ENABLE

OSC1

CMODE-CAP.

C-TRIM DC CUT

R-BPF1

R-BPF2

R-BPF3

DC CUT

L-R RECT

L+R RECT

VCS-TH

VCS-1

VCS-2

BPF1

BPF2

VREF

S-CH DC OUT

C-CH DC OUT

L-CH DC OUT

R-CH DC OUT

VREF

L-BPF1

L-BPF2

L-BPF3

DC CUT

R RECT

L RECT

VLR-TH

VLR-1

VLR-2

— 28 —

IC401 LC7822

IC701 µPC2581

IC202 BA6208

CONTROL

LATCH

SHIFT RESISTOR

LEVEL SHIFT

VEE

OUT

VSS

RESET

VDD

OUT

235

46798

MUTE

+ VOUT1

– VOUT1

COMP1

MF1

IN1

GND

IN2

NF2

COMP2

– VOUT2

+ VOUT2

VCC1

VCC2

VEE

PROTECTOR

BIAS CIRCUIT

REG DRIVE PRE

DRIVE

10 12 13 1514

DRIVE

PRE

DRIVE

1 2 3 4 5 6 7 89

OUTPUT 2

Vcc

GND

INPUT 2

INPUT 1

MOTOR

DRIVE

MOTOR

DRIVE

REG

SWITCH

OUTPUT1

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