STR-DE997 - Sony Audio Service Manual (repair manual)

1

US Model

Canadian Model

With 8 ohm loads, both channels driven, from
20 – 20,000 Hz; rated 110 watts per channel
minimum RMS power, with no more than
0.09 % total harmonic distortion from 250
milliwatts to rated output.

Power Output

Rated Power Output at Stereo Mode
(8 ohms 20 Hz – 20 kHz, THD 0.09 %)

110 W + 110 W

 1)

Reference Power Output

 1)

(8 ohms 20 Hz – 20 kHz, THD 0.09 %)

FRONT

 2)

 : 110 W/ch

CENTER

 2)

 : 110 W

SURR

 2)

 : 110 W/ch

SURR BACK

 2)

 : 110 W/ch or 110 W

(8 ohms 1 kHz, THD 0.7 %)

FRONT

 2)

 : 120 W/ch

CENTER

 2)

 : 120 W

SURR

 2)

 : 120 W/ch

SURR BACK

 2)

 : 120 W/ch or 120 W

1) Measured under the following conditions:

120 V AC, 60 Hz

2) Depending on the sound field settings and the

source, there may be no sound output.

Frequency response

PHONO

RIAA equalization curve
±0.5 dB

MULTI CH IN (1, 2),

10 Hz – 70 kHz

SA-CD/CD, TV/SAT,

+0.5/–2 dB (with sound

MD/TAPE, DVD,

field and equalizer

VIDEO 1, 2, 3

bypassed)

Inputs (Analog)

PHONO

Sensitivity: 8 mV
Impedance: 50 kiloohms
S/N

 3)

 : 86 dB

(A, 8 mV

 4)

 )

MULTI CH IN (1, 2),

Sensitivity: 500 mV

SA-CD/CD, TV/SAT,

Impedance: 50 kiloohms

MD/TAPE, DVD,

S/N

 3)

 : 96 dB

VIDEO 1, 2, 3

(A, 500 mV

 4)

 )

3) INPUT SHORT (with sound field and equalizer

bypassed).

4) Weighted network, input level.

2004J04-1

© 2004. 10

Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are
trademarks of Dolby Laboratories.
“DTS”, “DTS-ES”, “Neo:6” and “DTS 96/24” are
trademarks of Digital Theater Systems, Inc.

– Continued on next page –

2

Inputs (Digital)

DVD, SA-CD/CD

Sensitivity: –

(Coaxial)

Impedance: 75 ohms
S/N: 100 dB
(A, 20 kHz LPF)

TV/SAT, SA-CD/CD,

Sensitivity: –

MD/TAPE, VIDEO 3

Impedance: –

(Optical)

S/N: 100 dB
(A, 20 kHz LPF)

Outputs (Analog)

MD/TAPE (OUT),

Voltage: 500 mV

VIDEO 1, 2

Impedance: 10 kiloohms

(AUDIO OUT)

SUB WOOFER

Voltage: 2 V
Impedance: 1 kiloohms

Outputs (Digital)

MD/TAPE (Optical)

Sensitivity: –

Equalizer
Gain levels

±10 dB, 0.5 dB step

Tuning range

87.5 – 108.0 MHz

Antenna

FM wire antenna

Antenna terminals

75 ohms, unbalanced

Intermediate frequency

10.7 MHz

Sensitivity

Mono:

18.3 dBf, 2.2 

µV/75 ohms

Stereo:

38.3 dBf, 22.5 

µV/75 ohms

Useable sensitivity

11.2 dBf, 1 

µV/75 ohms

S/N

Mono:

76 dB

Stereo:

70 dB

Harmonic distortion at 1 kHz

Mono:

0.3%

Stereo:

0.5%

Separation

45 dB at 1 kHz

Frequency response

30 Hz – 15 kHz,
+0.5/–2 dB

Selectivity

60 dB at 400 kHz

Tuning range

With 10-kHz tuning scale: 530 – 1,710 kHz

 5)

With 9-kHz tuning scale: 531 – 1,710 kHz

 5)

Antenna

Loop antenna

Intermediate frequency

450 kHz

Usable sensitivity

50 dB/m (at 1,000 kHz or
999 kHz)

S/N

54 dB (at 50 mV/m)

Harmonic distortion

0.5 % (50 mV/m, 400 Hz)

Selectivity

At 9 kHz:

35 dB

At 10 kHz:

40 dB

5) You can change the AM tuning scale to 9 kHz or 10 kHz.

After tuning in any AM station, turn off the receiver. While
holding down PRESET TUNING + or TUNING +, press
?/1. All preset stations will be erased when you change
the tuning scale. To reset the scale to 10 kHz (or 9 kHz),
repeat the procedure.

Inputs/Outputs

Video:

1 Vp-p, 75 ohms

S-video:

Y: 1 Vp-p, 75 ohms
C: 0.286 Vp-p, 75 ohms

COMPONENT VIDEO:

Y: 1 Vp-p, 75 ohms
P

B

/C

B

/B-Y: 0.7 Vp-p,

75 ohms
P

R

/C

R

/R-Y: 0.7 Vp-p,

75 ohms

80 MHz HD Pass Through

Power requirements

120 V AC, 60 Hz

Power consumption

Area code

Power consumption

US

310 W

CND

420 VA

Power consumption (during standby mode)

0.3 W (when “POWER
SAVE” in the CUSTOMIZE
menu is set to “ON”)

AC outlets

2 switched, 120 W/1A MAX

Dimensions (w/h/d) (Approx.)

430 

× 157.5 × 371 mm

(16 

7/8

 

× 6 

2/8

 

× 14 

5/8

inches) including
projecting parts and
controls

Mass (Approx.)

10.7 kg (23 lb 10 oz)

Supplied accessories

FM wire antenna (1)
AM loop antenna (1)
Remote commander RM-LG113 (1)
R6 (size-AA) batteries (2)

Design and specifications are subject to change
without notice.

• Abbreviation

CND : Canadian model

3

0

0

0

Ω

µ

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.

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. 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” indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are suit-
able.  (See Fig. A)

Part No.

US

4-252-935-5s

CND

4-252-935-6s

• Abbreviation

CND : Canadian model

4

Main unit ................................................................................. 5
Remote button description ....................................................... 6

2-1.   Case ..................................................................................... 7
2-2.   Front Panel Section ............................................................. 8
2-3.   Back Panel Section .............................................................. 8
2-4.   Digital Board ....................................................................... 9
2-5.   STBY Board ........................................................................ 9
2-6.   Main Board ....................................................................... 10

..................................................................... 11

4-1.   Circuit Boards Location .................................................... 12
4-2.   Block Diagram – Tuner/Audio Section – .......................... 13
4-3.   Block Diagram – Digital Section – ................................... 14
4-4.   Block Diagram – Video Section – ..................................... 15
4-5.   Block Diagram – Key/Display Section – .......................... 16
4-6.   Block Diagram – OSD Section – ...................................... 17
4-7.   Block Diagram – Power Section – .................................... 18
4-8.   Printed Wiring Boards – Main Section – .......................... 20
4-9.   Schematic Diagram – Main Section (1/4) – ...................... 21
4-10. Schematic Diagram – Main Section (2/4) – ...................... 22
4-11. Schematic Diagram – Main Section (3/4) – ...................... 23
4-12. Schematic Diagram – Main Section (4/4) – ...................... 24
4-13. Printed Wiring Board – Digital Section (1/2) – ................ 25
4-14. Printed Wiring Board – Digital Section (2/2) – ................ 26
4-15. Schematic Diagram – Digital Section (1/3) – ................... 27
4-16. Schematic Diagram – Digital Section (2/3) – ................... 28
4-17. Schematic Diagram – Digital Section (3/3) – ................... 29
4-18. Printed Wiring Board – Audio Section – ........................... 30
4-19. Schematic Diagram – Audio Section – ............................. 30
4-20. Printed Wiring Board – Video Section (1/2) – .................. 31
4-21. Printed Wiring Board – Video Section (2/2) – .................. 32
4-22. Schematic Diagram – Video Section (1/2) – ..................... 33
4-23. Schematic Diagram – Video Section (2/2) – ..................... 34
4-24. Printed Wiring Board – Speaker Section – ....................... 35
4-25. Schematic Diagram – Speaker Section – .......................... 35
4-26. Printed Wiring Board – S-video Section – ........................ 36
4-27. Schematic Diagram – S-video Section – ........................... 37
4-28. Printed Wiring Boards – Panel Section (1/2) – ................. 38
4-29. Schematic Diagram – Panel Section (1/2) – ..................... 39
4-30. Printed Wiring Boards – Panel Section (2/2) – ................. 40
4-31. Schematic Diagram – Panel Section (2/2) – ..................... 41
4-32. Printed Wiring Boards – Power Section – ......................... 42
4-33. Schematic Diagram – Power Section – ............................. 43
4-34. IC Block Diagrams ............................................................ 44

5-1.   Case Section ...................................................................... 55
5-2.   Front Panel Section ........................................................... 56
5-3.   Back Panel Section ............................................................ 57
5-4.   Chassis Section ................................................................. 58

........................................ 59