SAFETY CHECK-OUT

After correcting the original service problem, perform the follow- ing safety check 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 TEST

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 microamperes.). 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. Follow the manufacturers’ 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 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 pas- sive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2 V AC range are suitable. (See Fig. A)

To Exposed Metal

Parts on Set

0.15 ∝ F

 

 

 

1.5 k Ω

AC

 

 

 

voltmeter

 

 

 

 

 

(0.75 V)

 

 

 

 

 

 

Earth Ground

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

MODEL IDENTIFICATION

– Rear View –

 

 

Part No.

 

 

 

 

Model

Part No.

DE945:

US model

4-226-871-0s

 

 

 

DE945:

Canadian model

4-226-871-1s

 

 

 

DE845:

US model

4-226-871-3s

DE845:

Canadian model

4-226-871-4s

 

 

 

 

Malaysia and Singapore models

4-226-871-5s

 

 

 

 

Chinese model

4-226-871-6s

 

Australian model

4-226-871-7s

 

 

 

 

E and PX models

4-226-871-8s

 

 

 

 

TABLE OF CONTENTS

 

1.

GENERAL

4

2.

DISASSEMBLY

6

3.

TEST MODE

9

4.DIAGRAMS

4-1.

Block Diagram – MAIN Section (1/2) –

11

4-2.

Block Diagram – MAIN Section (2/2) –

12

4-3.

Block Diagram

 

 

– DISPLAY/POWER SUPPLY Section –

13

4-4.

Note for Printed Wiring Boards and

 

 

Schematic Diagrams

14

4-5.

Schematic Diagram – DIGITAL Board (1/3) –

15

4-6.

Schematic Diagram – DIGITAL Board (2/3) –

16

4-7.

Schematic Diagram – DIGITAL Board (3/3) –

17

4-8.

Printed Wiring Board

 

 

–DIGITAL Board (Component Side)

18

4-9.

Printed Wiring Board

 

 

–DIGITAL Board (Conductor Side)

19

4-10.

Printed Wiring Boards

 

 

–VIDEO/JOINT (1) (H) Boards (DE845) –

20

4-11.

Schematic Diagram

 

 

–VIDEO/JOINT (1) (H) Boards (DE845) –

21

4-12.

Printed Wiring Boards

 

 

– OSD/OSD JOINT (H) Boards (DE945) –

22

4-13.

Schematic Diagram

 

 

– OSD/OSD JOINT (H) Boards (DE945) –

23

4-14.

Printed Wiring Board – AU SW Board –

24

4-15.

Schematic Diagram – AU SW Board –

25

4-16.

Printed Wiring Board – S-VIDEO Board –

26

4-17.

Schematic Diagram – S-VIDEO Board –

27

4-18.

Printed Wiring Board –DISPLAY Board –

28

4-19.

Schematic Diagram – DISPLAY Board –

29

4-20.

Printed Wiring Board – MAIN Board –

30

4-21.

Schematic Diagram – MAIN Board (1/3) –

31

4-22.

Schematic Diagram – MAIN Board (2/3) –

32

4-23.

Schematic Diagram – MAIN Board (3/3) –

33

4-24.

Printed Wiring Boards – H.P/MUTING/POWER/

 

 

ROTARY/VIDEO 3(DE945)/VOL/

 

 

V. SWITCH (E) Boards –

34

4-25.

Schematic Diagram – H.P/MUTING/POWER/

 

 

ROTARY/VIDEO 3(DE945)/VOL/

 

 

V. SWITCH (E) Boards –

35

4-26.

Printed Wiring Boards – BIAS (C)/BIAS (L)

 

 

/BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards –

36

4-27.

Schematic Diagram – BIAS (C)/BIAS (L)

 

 

/BIAS (R)/BIAS (LS)/BIAS (RS)/5.1 IN Boards –

37

4-28.

Printed Wiring Boards –DC (1)/DC (2) Boards –

38

4-29.

Schematic Diagram –DC (1)/DC (2) Boards –

39

4-30.

Printed Wiring Boards –AC/SP Boards –

40

4-31.

Schematic Diagram – AC/SP Boards –

41

4-32. IC Pin Function Description

46

5.

EXPLODED VIEWS

56

6.

ELECTRICAL PARTS LIST

59

3

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Sony STR-DE845 service manual ROTARY/VIDEO 3DE945/VOL, Exploded Views Electrical Parts List
Page 2 Page 4

STR-DE845 specifications

The Sony STR-DE845 is a vintage yet impressive 5.1-channel surround sound receiver that has captivated audio enthusiasts since its release. As part of Sony's esteemed line of home audio equipment, this model exemplifies a combination of classic design, robust build quality, and advanced features that enhance the listening experience.

One of the standout features of the STR-DE845 is its power output, capable of delivering 100 watts per channel at 8 ohms. This ample power ensures that your audio experience remains vibrant and dynamic, whether you’re enjoying music or watching movies. The receiver supports a range of speaker configurations, making it versatile enough to accommodate various home theater setups.

Another key characteristic of the STR-DE845 is its compatibility with Dolby Pro Logic and DTS surround sound formats. These technologies bring a cinematic experience into the home, allowing sound to envelop listeners from all directions. The receiver's ability to decode these formats enhances the clarity and immersion of soundtracks, providing an impressive auditory experience.

The STR-DE845 boasts a wide array of connectivity options, including multiple analog and digital inputs, which allow you to connect various audio sources such as CD players, VCRs, and gaming consoles. The inclusion of an AM/FM tuner also opens up the possibility for listening to local radio stations. For convenience, the receiver includes a remote control, enabling users to adjust settings and change inputs from a distance.

In terms of audio processing, the STR-DE845 features Advanced Digital Sound Field Processing (DSFP), which allows users to customize their listening experience based on room acoustics and personal preferences. This technology helps replicate the ambiance of live music venues and movie theaters, delivering an optimized sound experience regardless of the room's characteristics.

The design of the STR-DE845 is another highlight. With a sleek black finish and intuitive layout, this receiver fits seamlessly into any home entertainment setup. The front panel features a clear display, and the user-friendly interface makes navigating settings and configurations straightforward.

Moreover, the receiver's durability is noteworthy. Built with quality components, the STR-DE845 is designed to withstand the test of time, making it a dependable option for audiophiles and casual listeners alike.

In conclusion, the Sony STR-DE845 is a feature-packed surround sound receiver that combines quality, functionality, and a user-friendly experience. With its powerful output, advanced surround sound technologies, and versatility in connectivity, it remains a respectable choice for those looking to elevate their audio and home theater systems.
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