Sony STR-DE225 Manuale utente

STR-DE225/DE325

AEP Model

Canadian Model

STR-DE225/DE325

US Model

E Model

Australian Model

Chinese Model

STR-DE325

UK Model

STR-DE225

SERVICE MANUAL

FM STEREO/FM-AM RECEIVER

Manufactured under license from Dolby Laboratories

Licensing Corporation.

“DOLBY”, “PRO LOGIC” and the double-D symbol are

trademarksofDolbyLaboratoriesLicensingCorporation.

MICROFILM

SPECIFICATIONS

Photo : STR-DE225

Amplifier section

Power output

Stereo mode (DIN 1 kHz, 4 ohms)

STR-DE325: 90 W + 90 W

STR-DE225: 40 W + 40 W

Surround (DIN 1 kHz, 4 ohms)

mode Front: STR-DE325: 90W/ch

STR-DE225: 40W/ch

Centre: STR-DE325: 90W

STR-DE225: 40W

(only in PRO LOG IC MODE)

REAR: STR-DE325:

(DIN 1 kHz, 4ohms) 90 W

STR-DE225: (DIN 1 kHz,

4ohms) 40 W

5.1/DVD Front: 90 W/ch

INPUT * mode (DIN 1 kHz, 4 ohms)

Centre: 90 W

(DIN 1 kHz, 4 ohms)

Rear: 45 W/ch

(DIN 1 kHz, 8 ohms)

(except STR-DE225)

Frequency PHONO: RIAA(except STR-DE225)

response equalization curve ±0.5 dB

TV / LD, CD, TAPE / MD,

VIDEO, 5.1/DVD INPUT*:

10Hz - 50kHz ±1dB

Input

Sensitivity Impedance S/N

(Weighting

network,

input level)

PHONO 50 74 dB

(STR-DE325) 2.5mV kilohms 72 dB**

(MM) (A, 2.5 mV)

CD,

5.1/DVD 200 mV

INPUT* 50 82 dB

TAPE/MD, kilohms 82 dB**

TV/LD,

VIDEO

**’78IHF

Outputs TAPE/MD REC OUT:

Voltage: 150 mV,

Impedance: 10 kilohms

VIDEOAUDIO OUT:

Voltage: 150 mV,

Impedance: 10 kilohms

WOOFER/MIX AUDIO

OUT:Voltage: 2V

Impedance: 10 kilohms

PHONES: Accepts low and high

impedance headphones

Muting Full mute

BASS BOOST +10dB at 70 Hz

TONE ±8dB at 100 Hz and 10 kHz

FM tuner section

Tuning range 87.5 – 108.0 MHz

Aerial terminals 75 ohms, unbalanced

Sensitivity Mono: 18.3 dBf, 2.2µV /75 ohms

Stereo: 38.3 dBf, 22.5µV /75

ohms

Usable sensitivity 11.2 dBf, 1V /75 ohms (IHF)

S/N Mono: 76 dB

Stereo: 70dB

Harmonic Mono: 0.3 %

distortion at Stereo: 0.5 %

1 kHz

Separation 45dB at 1 kHz

Frequency 30 Hz – 15kHz +0.5 dB

response

Selectivity 60 dB at 400 kHz

AM tuner section

Tuning range 531 – 1602 kHz

Aerial Loop aerial

Usable sensitivity 50 dB/m (at 999 kHz)

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

Harmonic 0.5%(50 mV/m, 400Hz)

distortion

Selectivity 35 dB

–2

— Continued on next page —

STR-DE225/DE325

— 9 — — 10 —

3-3. SCHEMATIC DIAGRAM — DISPLAY SECTION —

STR-DE225/DE325

— 13 — — 14 —

3-5. SCHEMATIC DIAGRAM — POWER SECTION —

STR-DE225/DE325

— 19 — — 20 —

3-8. SCHEMATIC DIAGRAM — MAIN SECTION (1/3) —

STR-DE225/DE325

— 21 — — 22 —

3-9. SCHEMATIC DIAGRAM — MAIN SECTION (2/3) —

STR-DE225/DE325

— 23 — — 24 —

3-10. SCHEMATIC DIAGRAM — MAIN SECTION (3/3) —

— 27 —

3-12. IC BLOCK DIAGRAMS

• IC BLOCK DIAGRAMS

IC1 BU1922

QUALITY BIT

GENERATOR

DEFFERENTIAL

DECODER

BIPHASE

SYMBOL

DECODER

OSCILLATOR

AND

DIVIDER

57kHz

BANDPASS

(8th ORDER)

CONTAS LOOP

VARIABLE AND

FIXED DIVIDER

REFERENCE

VOLTAGE

ANTI-

ALIASING

FILTER

CLOCKED

COMPARATOR

TEST LOGIC AND OUTPUT

SELECTOR SWITCH

RECONSTRUCTION

FILTER

141516 13 12 11 10 9

321 4 5 6 7 8

CLOCK REGENERATION

AND SYNC

VP1

RDCL

TS7

OSCO

OSCI

VDDD

VSSD

TEST

TSTL

QUAL

RDDA

Vref

MUX

VDDA

VSSA

CIN

SCOUT

CONTROL

LATCH

SHIFT RESISTOR

LEVEL SHIFT

VEE

OUT

VSS

RESET

VDD

OUT

ININ

OUT

IC401, IC500 LC7822

235

46798

MUTE

+ VOUT1

– VOUT1

COMP1

MF1

IN1

GND

IN2

NF2

COMP2

– VOUT2

+ VOUT2

VCC1

VCC2

VEE

PROTECTOR

BIAS CIRCUIT

REG DRIVE PRE

DRIVE

1110 12 13 1514

DRIVE

PRE

DRIVE

IC701 uPC2581V

— 28 —

1 2 3 4 5 6 7 89

OUTPUT 2

Vcc

GND

INPUT 2

INPUT 1

MOTOR

DRIVE

MOTOR

DRIVE

REG

SWITCH

OUTPUT1

IC202 BA6208

IC950 NJM2103D

V+

VSB/SESIN

VSA

RESET

GND

OUTC

VSC

VREF

+–

–+

–

R S

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