STR-DE485, STR-DE485E - Sony Audio Service Manual (repair manual)

1

US Model

Canadian Model

E Model

Australian Model

Chinese Model

STR-DE485

AEP Model

UK Model

STR-DE485E

With 8 ohm loads, both channels driven, from
40 – 20,000 Hz; rated 80 watts per channel
minimum RMS power, with no more than
0.09 % total harmonic distortion from 250
milliwatts to rated output (STR-DE485 area
code US only).

POWER OUTPUT

Models of area code US, CND
Rated Power Output at Stereo Mode
(8 ohms 40 Hz – 20 kHz, THD 0.09 %)
STR-DE485:

80 W + 80 W

Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
STR-DE485:

FRONT

 1)

 : 80 W/ch

CENTER

 1)

 : 80 W

SURR

 1)

 : 80 W/ch

Models of area code AEP, UK
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)
STR-DE485E

80 W + 80 W

 2)

Reference Power Output
(8 ohms 1 kHz, THD 0.7 %)
STR-DE485E

FRONT

 1)

 : 80 W/ch

CENTER

 1)

 : 80 W

SURR

 1)

 : 80 W/ch

Models of other area code
Rated Power Output at Stereo Mode
(8 ohms 1 kHz, THD 0.7 %)

80 W + 80 W

 2)

Reference Power Output

 2)

(8 ohms 1 kHz, THD 10 %)

FRONT

 1)

 : 100 W/ch

CENTER

 1)

 : 100 W

SURR

 1)

 : 100 W/ch

1) Depending on the sound field settings and the

source, there may be no sound output.

2) Measured under the following conditions:

Area code

Power requirements

E, AUS

240 V AC, 50 Hz

SP, AEP, UK

230 V AC, 50 Hz

TW

110 V AC, 60 Hz

MX

120 V AC, 60 Hz

Frequency response

MULTI CH IN

10 Hz – 50 kHz

(STR-DE485 only), CD,

+0.5/–2 dB (with sound

MD/TAPE, DVD/LD,

field, and tone bypassed)

VIDEO 1, 2

Inputs (Analog)

MULTI CH IN

Sensitivity: 250 mV

(STR-DE485 only), CD,

Impedance: 50 kilohms

MD/TAPE, DVD/LD,

S/N

 3)

 : 96 dB

VIDEO 1, 2

(A, 250 mV

 4)

 )

3) INPUT SHORT (with sound field and tone

bypassed).

4) Weighted network, input level.

2003G04-1

© 2003.07

Photo: STR-DE485

Manufactured under license from Dolby Laboratories.
“Dolby”, “Pro Logic” and the double-D symbol are
trademarks of Dolby Laboratories.
“DTS” and “DTS Digital Surround” are registered
trademarks of Digital Theater Systems, Inc.

– Continued on next page –

2

Inputs (Digital)

DVD/LD (Coaxial)

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

VIDEO 2 (Optical)

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

Outputs

MD/TAPE (REC

Voltage: 250 mV

OUT), VIDEO1

Impedance: 10 kilohms

(AUDIO OUT)

SUB WOOFER

Voltage: 2 V
Impedance: 1 kilohms

Tone

Gain levels:

±6 dB, 1 dB step

Tuning range

87.5 - 108.0 MHz

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

Usable 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

Models of area code US, CND
With 10-kHz tuning scale: 530 – 1710 kHz

 5)

With 9-kHz tuning scale: 531 – 1710 kHz

 5)

Models of area code E2, MX
With 10-kHz tuning scale: 530 – 1610 kHz

 5)

With 9-kHz tuning scale: 531 – 1602 kHz

 5)

Models of area code AUS, SP, AEP, UK, TW
With 9-kHz tuning scale: 531 – 1602 kHz

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. Hold down PRESET TUNING + and
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

Video:

1 Vp-p, 75 ohms

Outputs

Video:

1 Vp-p, 75 ohms

Power requirements

Area code

Power requirements

US, CND, MX

120 V AC, 60 Hz

AEP, UK

230 V AC, 50/60 Hz

SP

220 – 230 V AC, 50/60 Hz

E

120/220/240 V AC, 50/60 Hz

TW

110 V AC, 50/60 Hz

AUS

240 V AC, 50Hz

Power consumption

Area code

Power consumption

US, MX

STR-DE485: 180 W

CND

STR-DE485: 260 VA

AEP, UK

STR-DE485E: 155 W

AUS, SP, E

STR-DE485: 155 W

TW

STR-DE485: 400 W

Power consumption (during standby mode)

0.5 W

Dimensions

430 

× 145 × 298 mm

(16 

7/8

 

× 5 

6/8

 

× 11 

6/8

 in.)

including projecting parts
and controls

Mass (Approx.)

7.0 kg (15lb 7 oz)

Supplied accessories

FM wire antenna (1)
AM loop antenna (1)
• STR-DE485E/DE485 only

Remote commander RM-U306 (1)
R6 (size-AA) batteries (2)

Design and specifications are subject to change
without notice.

• Abbreviation

CND

: Canadian model

AR

: Argentina model

AUS

: Australian model

CH

: Chinese model

MX

: Mexican model

SP

: Singapore model

TW

: Taiwan model

3

Part No.

US

4-238-188-0s

Canadian

4-238-188-1s

Australian

4-238-188-2s

Singapore

4-238-188-3s

Chinese

4-238-188-4s

E

4-238-188-5s

AEP

4-238-188-6s

UK

4-238-188-7s

Mexican

4-238-188-8s

Argentina

4-238-188-9s

Taiwan

4-238-189-9s

Ω

µF

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 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)

COMPONENTS  IDENTIFIED  BY  MARK  0  OR  DOTTED  LINE
WITH  MARK  0  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.

LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0 SUR LES
DIAGRAMMES SCHÉMATIQUES ET LA LISTE  DES PIÈCES SONT
CRITIQUES POUR LA SÉCURITÉ DE FONCTIONNEMENT. NE
REMPLACER CES COMPOSANTS QUE PAR DES PIÈCES SONY
DONT LES NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

4

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

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

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

4-1.   IC Pin Description ............................................................. 12
4-2.   Circuit Boards Location .................................................... 15
4-3.   Block Diagram – Tuner/Audio Section – .......................... 16
4-4.   Block Diagram – Digital Section – ................................... 17
4-5.   Block Diagram – Video/Display Section – ....................... 18
4-6.   Block Diagram – Power Section – .................................... 19
4-7.   Printed Wiring Boards – Main Section – .......................... 21
4-8.   Schematic Diagram – Main Section (1/2) – ...................... 22
4-9.   Schematic Diagram – Main Section (2/2) – ...................... 23
4-10. Printed Wiring Board – Digital Section (1/2) – ................ 24
4-11. Printed Wiring Board – Digital Section (2/2) – ................ 25
4-12. Schematic Diagram – Digital Section (1/2) – ................... 26
4-13. Schematic Diagram – Digital Section (2/2) – ................... 27
4-14. Printed Wiring Board – Video Section – ........................... 28
4-15. Schematic Diagram – Video Section – .............................. 29
4-16. Printed Wiring Boards – Display Section – ...................... 30
4-17. Schematic Diagram – Display Section – ........................... 31
4-18. Printed Wiring Boards – Power Section – ......................... 32
4-19. Schematic Diagram – Power Section – ............................. 33
4-20. IC Block Diagrams ............................................................ 34

5-1.   Case Section ...................................................................... 35
5-2.   Front Panel Section ........................................................... 36
5-3.   Chassis Section-1 .............................................................. 37
5-4.   Chassis Section-2 .............................................................. 38

......................................... 39