SONY STRDE425 - Service Manual Immediate Download

STR-DE425

US Model

Canadian Model

AEP Model

UK Model

E Model

Australian Model

Chinese Model

SERVICE MANUAL

FM STEREO/FM-AM RECEIVER

Manufactured under license from Dolby Laboratories

Licensing Corporation.

"DOLBY", "PRO LOGIC" and the double-D symbol are

trademarks of Dolby Laboratories Licensing Corporation.

MICROFILM

SPECIFICATIONS

Amplifier section

Power output

Stereo mode

(DIN 1 kHz, 4 ohms)

90 W + 90 W

Surround

(DIN 1 kHz, 4 ohms)

mode

Front: 90W/ch

Centre: 90W

(only in PRO LOG IC MODE)

REAR: (DIN 1 kHZ, 8ohms) 45 W/ch

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)

Frequency

PHONO: RIAA

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

2.5mV

74 dB

(MM)

kilohms

72 dB**

(A, 2.5 mV)

CD,

5.1/DVD

200 mV

INPUT*

82 dB

TAPE/MD,

kilohms

82 dB**

TV/LD,

150 mV

(A, 150 mV)

VIDEO

**'78IHF

Outputs

TAPE/MD REC OUT:

Voltage: 150 mV,

Impedance: 10 kilohms

VIDEO AUDIO 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

-- Continued on next page --

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

Video section

Input

VIDEO 1, 2, TV:

1 Vp-p 75 ohms

Output

VIDEO 1, 2, MONITOR:

1 Vp-p 75 ohms

General

System

Tuner section; PLL

quartz-locked digital

synthesizer system

Preamplifier section:

Low-noise NF type

epualizer

Power amplifier section:

Pure-complimentary

SEPP

Power

230 V AC, 50/60 Hz

requirements

Power

230 W

consumption

AC outlets

Switched 100 W

(except for the U.K.

model)

-- 2 --

GENERAL ······························································· 3

TEST MODE ···························································· 4

DIAGRAMS

3-1.

Circuit Boards Location ····················································· 5

3-2.

Block Diagram ··································································· 7

3-3.

Schematic Diagram -- Display Section -- ························ 9

3-4.

Printed Wiring Board -- Display Section -- ··················· 11

3-5.

Schematic Diagram -- Power Section -- ························ 13

3-6.

Printed Wiring Board -- Power Section -- ····················· 15

3-7.

Printed Wiring Board -- Main Section -- ······················· 17

3-8.

Schematic Diagram -- Main Section (1/3) -- ················· 19

3-9.

Schematic Diagram -- Main Section (2/3) -- ················· 21

3-10. Schematic Diagram -- Main Section (3/3) -- ················· 23

3-11. IC Pin Function Description ············································· 25

3-12. IC Block Diagrams ··························································· 27

EXPLODED VIEWS

4-1.

Front Panel Section ·························································· 29

4-2.

Chassis Section ································································· 30

ELECTRICAL PARTS LIST ································ 31

TABLE OF CONTENTS

After correcting the original service problem, perform the

following safety checks before releasing the set to the customer:

Check the antenna terminals, metal trim, "metallized" knobs, screws,

and all other exposed metal parts for AC leakage. Check leakage as

described below.

LEAKAGE

The AC leakage from any exposed metal part to earth ground and

from all exposed metal parts to any exposed metal part having a

return to chassis, must not exceed 0.5 mA (500 microampers).

Leakage current can be measured by any one of three methods.

A commercial leakage tester, such as the Simpson 229 or RCA

WT-540A. Follow the manufacturers' instructions to use these

instruments.

A battery-operated AC milliammeter. The Data Precision 245

digital multimeter is suitable for this job.

Measuring the voltage drop across a resistor by means of a

VOM or battery-operated AC voltmeter. The "limit" indication

is 0.75 V, so analog meters must have an accurate low-voltage

scale. The Simpson 250 and Sanwa SH-63Trd are examples of

a passive VOM that is suitable. Nearly all battery operated

digital multimeters that have a 2V AC range are suitable. (See

Fig. A)

SAFETY CHECK-OUT

To Exposed Metal

Parts on Set

0.15

µF

1.5 k

Voltmeter

(0.75 V)

Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

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.

ATTENTION AU COMPOSANT AYANT RAPPORT

À LA SÉCURITÉ!

LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE ! SUR LES

DIAGRAMMES SCHÉMATIQUES ET LA LISTE DES PIÈCES SONT

CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE

REMPLACER CES COMPOSANTS QUE PAR DES PIÈSES SONY

DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU

DANS LES SUPPÉMENTS PUBLIÉS PAR SONY.

Dimensions

430

× 145 × 295 mm

Mass(Approx.)

STR-DE425: 7.9 kg

Supplied

FM wire aerial (1)

accessories

AM loop aerial (1)

Remote controller (remote) (1)

Size AA (R6) batteries (2)

Design and specifications are subject to change without notice.

Specifications indicated are measured at 230 VAC, 50 Hz

-- 3 --

SECTION 1

GENERAL

!º

!¡

!TM

!£

!¢

!§

!ª

!¶

!·

@º

@¡

@·

@ª

@£

@¶

@¢

@§

@TM

#º

#¡

3 45

!º

!¡

!TM

!£

!¢

1 POWER switch (I/u)

2 CENTER LEVEL +, buttons

3 REAR LEVEL +, buttons

4 PRO LOGIC, C.STUDIO, HALL indicators

5 5.1/DVD INPUT, BASS BOOST indicators

6 MASTER VOLUME control

7 BALANCE control

8 TREBLE control

9 BASS control

!º MUTING button/indicator

!¡ SURROUND ON/OFF button

!TM SURROUND EFFECT/DELAY, MODE buttons

!£ SET UP, 5.1/DVD INPUT, BASS BOOST buttons

!¢ TV/LD button

! TAPE/MD button

!§ PHONO button

!¶ TUNER button

!· CD button

!ª VIDEO button

@º Numeric buttons

@¡ DIRECT TUNING, SHIFT buttons

@TM CHARACTER, DISPLAY buttons

@£ MEMORY button

@¢ FM/AM button

@ PRESET/CHARACTER +, buttons

@§ FM MODE button

@¶ SLEEP button

@· TUNING/PTY SELECT +, buttons

@ª RDS PTY, EON buttons

#º PHONES jack

#¡ SPEAKERS A, B ON/OFF buttons

1 ANTENNA (FM/AM)

2 5.1/DVD INPUT

3 y SIGNAL GND

4 MONITOR

5 WOOFER

6 FRONT SPEAKERS (A/B)

7 AC OUTLET

8 AC power cord

9 SURROUND SPEAKERS (CENTER)

0 SURROUND SPEAKERS (REAR)

!¡ VIDEO

!TM TV/LD

!£ TAPE/MD

!¢ CD

! PHONO

LOCATION AND FUNCTION OF CONTROLS

[FRONT PANEL]

[REAR PANEL]

-- 4 --

SECTION 2

TEST MODE

INITIALIZATION MODE

* All preset contents are cleared when this mode is activated. Use

this mode before returning the product to clients upon completion

of repair.

* Procedure:

While depr essing the VIDEO and the TAPE/MD buttons

simultaneously, press the power [I/u] button to turn on the main

power. The message INITIAL appears and initialization is

performed.

FLUORESCENT INDICATOR TUBE TEST MODE

* All fluorescent segments are tested. When this test is activated,

all segments turn on at the same time, then each segment turns on

one after another.

* Procedure:

While depressing the TV/LD and the BASS BOOST buttons

simultaneously, press the power [I/u] button to turn on the main

power. All segments turn on at the same time, then each segment

turns on one after another. The message FINISH appears when this

test is complete.

AUTO-BETICAL CHECK MODE

* To auto-scanning FM board and memorise RDS station. (FM/

RDS model only)

* Procedure:

While depressing the MEMORY button, press the power [I/u]

button to turn on the main power. The message AUTO BET appears

and each function is selected one after another.

AM CHANNEL STEP 9 kHz/10 kHz

SELECTION MODE

* Either the 9 kHz step or 10 kHz step can be selected for the AM

channel step. (US, CND and E model only)

* Procedure:

Set the FUNCTION to AM. Turn off the main power.

While depressing the TUNING+ button, press the power [I/u] button

to turn on the main power. Either the message 9k STEP or 10k

STEP appears. Select the desired step.

REAR SPEAKER GAIN UP MODE

* The rear speaker gain can be set to either NORMAL or GAIN UP.

* Procedure:

While depressing the -SURROUND- MODE button, press the power

[I/u ] button to turn on the main power. Either the message

NORMAL or GAIN UP appears. When the product enters this

mode again, the other gain appears. Select the desired gain.

SOFTWARE VERSION DISPLAY MODE

* The software version is displayed.

* Procedure:

While depressing the TUNER and the BASS BOOST buttons

simultaneously, press the power [I/u] button to turn on the main

power. The software version is displayed.

-- 5 --

SECTION 3

DIAGRAMS

3-1.

CIRCUIT BOARDS LOCATION

PRIMARY

board

DISPLAY

board

SP-SW board

10 KEY board

VR-TONE board

VOLUME board

MAIN board

VIDEO board

STAND BY board

SP-SCREW board

SECONDARY

board