Sony STR-SE581 Service Manual

STR-SE581

MICROFILM

SERVICE MANUAL

Manufactured under license from Dolby Laboratories Licensing Corporation. “Dolby” “Pro Logic” and the double-D symbol a are trademarks of Dolby Laboratories Licensing Corporation.

SPECIFICATIONS

US Model

Audio power specifications

POWER OUTPUT AND TOTAL HARMONIC DISTORTION With 8 Ω load, both channels driven, from 40 - 20,000 Hz, rated 100 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 Ω at 40 Hz - 20 kHz less than 0.5% total

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

5.1/DVD INPUT* mode (8 Ω at 1 kHz, THD 0.8%)

Frequency response PHONO: RIAA

Inputs

Sensitivity Impedance

PHONO (MM)

CD 400 mV TAPE/MD, 250 mV TV/DBS, 50 Kilohms VIDEO, 5.1/ DVD INPUT*

2.5 mV 50 Kilohms

harmonic distortion) 100 W + 100 W

Front: 100 W/ch Center: (Pro Logic Mode) 100 W Rear: 50 W/ch

Front: 100 W/ch Center: 100 W Rear: 50 W/ch

equalization curve ±0.5 dB TV/DBS, CD, TAPE/MD, VIDEO, 5.1/DVD INPUT 10 Hz - 50 kHz ±1 dB

S/N (weighting network,

input level)

72 dB*

(A, 2.5 mV)

82 dB*

(A, 150 mV)

*78 IHF

Outputs TAPE/MD REC OUT:

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

Sensitivity Mono: 18.3 dBf, 4.5 µV Usable sensitivity 11.2 dBf, 2 µV (IHF)

S/N Mono: 76 dB

Harmonic distortion at 1 kHz

Separation 45 dB at 1 kHz 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)

Voltage: 150 mV, Impedance: 10 kΩ

VIDEO AUDIO OUT:

Voltage: 150 mV, Impedance: 10 kΩ

WOOFER:

Voltage: 2 V, Impedance: ± 10 kΩ

PHONES:

Accepts low and high impedance headphones

300 ohms, balanced Stereo: 38.3 dBf, 45 µV

Stereo: 70 dB

Mono: 0.3% Stereo: 0.59%

+0.5

— Continued on next page —

FM STEREO/FM-AM RECEIVER

Harmonic distortion 0.5% (50 mV/m, 400 kHz) Selectivity At 10 kHz: 40 dB

General

System Tuner section:

Power requirements 120 V AC, 60 Hz Power consumption 230 W AC outlets 2 switched, total 120 W/1A Max Dimensions 17 × 5

Mass (Approx.) 16 IB 15 oz (7.7 kg) Supplied accessories FM wire antenna (1)

Design and specifications are subject to change without notice.

PLL quartz-locked digital synthesizer system Preamplifier section: Low-noise NF type equalizer Power amplifier section: Pure-complementary SEPP

/8 × 11 5/8 inches

(430 × 145 × 295 mm)

AM loop antenna (1) Remote controller (remote) (1) Size AA (R6) batteries (2)

SAFETY CHECK-OUT

TABLE OF CONTENTS

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

2. TEST MODE····························································5

3. DIAGRAMS

3-1. Circuit Boards Location ····················································· 6 3-2. Printed Wiring Board – Display Section – ························7 3-3. Schematic Diagram – Display Section – ··························· 9 3-4. Printed Wiring Board – Volume/Video Section –············ 11 3-5. Schematic Diagram – Volume/Video Section – ··············13 3-6. Printed Wiring Board – Main Section – ··························15 3-7. Schematic Diagram – Main Section (1/3) – ···················· 17 3-8. Printed Wiring Board – SP-SW, Power Section – ··········· 19 3-9. Schematic Diagram – Main Section (2/3), SP-SW – ······ 21 3-10. Schematic Diagram – Main Section (3/3), Power – ········ 23 3-11. IC Pin Function ································································ 25 3-12. IC Block Diagrams ··························································· 27

4. EXPLODED VIEWS

4-1. Front Panel Section ·························································· 29 4-2. Chassis Section ································································· 30

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 leaka ge. 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.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT -540A. F ollow the manuf acturers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a VOM or battery-operated A C 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)

5. ELECTRICAL PARTS LIST································ 31

T o Exposed Metal

Parts on Set

0.15

Fig. A. Using an A C v oltmeter to check A C leakage.

1.5 k

Ω

Earth Ground

Voltmeter (0.75 V)

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK ! OR DO TTED 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.

— 2 —

LOCATION AND FUNCTION OF CONTROLS

12#£34 5 !•!¶!§!¢!

[FRONT PANEL]

#™

#¡

SECTION 1

GENERAL

@§@•#º

1 POWER switch (I/u) 2 CENTER LEVEL +, – buttons 3 PRO LOGIC indicator 4 C. STUDIO indicator 5 HALL indicator 6 MASTER VOLUME control 7 BALANCE control 8 TREBLE control 9 BASS control 0 BASS BOOST button/indicator !¡ SURROUND ON/OFF button !™ MODE button !£ SET UP button !¢ EFECT/DELAY TIME button !∞ 5.1/DVD INPUT button !§ TAPE/MD FUNCTION button !¶ TV/DBS FUNCTION button

78!¡!∞ !™@º !ª@¡@™@£@¢@∞@¶@ª 9!º

!• VIDEO FUNCTION button !ª PHONO FUNCTION button @º TUNER FUNCTION button @¡ CD FUNCTION button @™ DIRECT button @£ SHIFT button @¢ Numeric buttons @∞ PRESET TUNING +, – buttons @§ MEMORY button @¶ AM button @• FM button @ª FM MODE button #º TUNING +, – buttons #¡ PHONES jack #™ SPEAKERS A/B buttons #£ REAR LEVEL +, – buttons

— 3 —

[REAR PANEL]

1 2 !¢ !∞

4567 8 9 0 !§ !¡ !£

1 SIGNAL GND 2 5.1/DVD INPUT (FRONT/REAR) 3 WOOFER 4 ANTENNA (AM/FM) 5 PHONO 6 CD 7 TAPE/MD 8 TV/DBS

!™

9 VIDEO 0 SURROUND SPEAKERS (REAR) !¡ FRONT SPEAKERS !™ AC OUTLET !£ AC power code !¢ 5.1/DVD INPUT (CENTER) !∞ 5.1/DVD INPUT (WOOFER) !§ SURROUND SPEAKERS (CENTER)

— 4 —

SECTION 2

SP-SW BOARD

PRIMARY BOARD

SECONDARY BOARD

STANDBY BOARD

MAIN BOARD

VIDEO BOARD

SWITCH BOARD

VOLUME BOARD

VR-TONE BOARD

KEY BOARD

DISPLAY BOARD

TEST MODE

SECTION 3 DIAGRAMS

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 depressing the VIDEO, TAPE/MD and the CD 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 se gments are tested. When this test is activ ated,

all segments turn on at the same time, then each segment turns on one after another.

* Procedure:

While depressing the CD and the TAPE/MD 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.

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.

* 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 messa ge 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 button, press the power [I/ u] b utton 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.

3-1. CIRCUIT BOARDS LOCATION

THIS NOTE IS COMMON FOR PRINTED WIRING BOARDS AND SCHEMATIC DIAGRAMS. (In addition to this 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 Ω and 1/ specified.

• % : indicates tolerance.

• ¢ : internal component.

• 2 : nonflammable resistor.

• 1 : fusib le resistor.

• C : panel designation.

Note: The components identified by mark ! or dotted line

with mark ! are critical for safety. Replace only with part number specified.

• U : B+ Line.

• V : B– Line.

• Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. No mark : FM

• Voltages are taken with a VOM (Input impedance 10 MΩ). V oltage variations may be noted due to normal production tolerances.

• Waveforms are taken with a oscilloscope.

• Circled numbers refer to waveforms.

• Signal path. F : FM

W or less unless otherwise

For printed wiring boards. Note:

• X : parts extracted from the component side.

• b : Pattern from the side which enables seeing.

• Wa veforms

1 IC300 @¢ (OSC)

8MHz

4.75Vp-p

2 IC201 #¢ (X1)

4.19MHz

5.3Vp-p

— 5 — — 6 —

STR-SE581

3-2. PRINTED WIRING BOARD — DISPLAY SECTION —

DISPLAY BOARD

VOLUME BOARD

CNP202

(Page 11)

34567891011121314

TO MAIN BOARD CNS204

(Page 16)

(5.1 INPUT)

1 80

IC201

24 25

40 41

65 64

(HALL) (C.STUDIO) (PRO LOGIC)

(REMOTO SEUSOR)

PRESET TUNING

CENTER

LEVEL

REAR

LEVEL

POWER

TUNING

KEY BOARD

SURROUND

ON/OFF

MODE

SET UP

DELAY TIME

5.1/DVD INPUT

EFFECT

TAPE/MD

TV/DBS

VIDEO

CDTUNERPHONO

DIRECT

SHIFT

MEMORY

1-665-281-

134

67890

(12)

FM MODE

1-665-280-

(12)

• Semiconductor Location

Ref. No. Location

D201 C-3 D202 C-3 D203 C-3 D204 B-13 D211 C-9 D213 C-9 D214 C-9 D231 C-1 D234 C-2 D235 C-9 D236 C-10 D237 C-11

Ref. No. Location

D239 C-3 D240 C-2

IC201 D-6 IC202 B-2 IC203 D-11

Q201 B-13 Q202 B-12 Q231 C-1 Q232 E-3

— 7 — — 8 —

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

STR-SE581

— 9 — — 10 —

STR-SE581

3-4. PRINTED WIRING BOARD — VOLUME/VIDEO SECTION —

• Semiconductor

Location

Ref. No. Location

D238 F-5 D310 H-12

IC404 C-9 IC500 C-11 IC502 C-12

Q361 D-6 Q362 C-6 Q363 C-6 Q364 C-6 Q365 C-6 Q367 H-11 Q401 D-8 Q402 D-9 Q451 D-8 Q452 D-9 Q501 B-11

VOLUME BOARD

MASTER VOLUME

VR-TONE BOARD

345678910111213

TO MAIN BOARD

CNP503

(Page 15) (Page 15)

TO MAIN BOARD

CNP504

SWITCH BOARD

BASS

BOOST

TO MAIN BOARD CNS701 (Page 15)

1-665 283-

TO DISPLAY BOARD

CNS202 (Page 7)

VIDEO BOARD

(12)

FRONT REAR WOOFER CENTER

J501

RLRLRL

J253

WOOFER

CN505CN501

1-665 255-

(12)

JW261

TREBLEBALANCE

BASS

1-665-284-

(12)

TO MAIN BOARD

CNS251 (Page 15)

1-665-261-

(12)

— 11 — — 12 —

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

STR-SE581

— 13 — — 14 —

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