Sony STR-DE485 User manual

1
SERVICE MANUAL
US Model
Canadian Model
E Model
Australian Model
Chinese Model
STR-DE485
AEP Model
UK Model
STR-DE485E
STR-DE485/DE485E
FM STEREO/FM-AM RECEIVER
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
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).
Amplifier section
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
SPECIFICATIONS
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.
Ver 1.0 2002. 02
9-873-587-01
2002B0400-1
© 2002.02
Sony Corporation
Home Audio Company
Published by Sony Engineering Corporation
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
STR-DE485/DE485E
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
FM tuner section
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
AM tuner section
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.
Video section
Inputs
Video: 1 Vp-p, 75 ohms
Outputs
Video: 1 Vp-p, 75 ohms
General
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
STR-DE485/DE485E
MODEL IDENTIFICATION
— BACK PANEL —
Part No.
MODEL 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
1.5 k Ω 0.15 µF
AC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
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)
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED LINE
WITH MARK 0ON 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 IDENTIFIÉS PAR UNE MARQUE 0SUR 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
TABLE OF CONTENTS
1. GENERAL
Main unit ................................................................................. 5
Remote button description ....................................................... 6
2. DISASSEMBLY
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
3.TEST MODE ...................................................................... 11
4. DIAGRAMS
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. EXPLODED VIEWS
5-1. Case Section ...................................................................... 35
5-2. Front Panel Section ........................................................... 36
5-3. Chassis Section-1 .............................................................. 37
5-4. Chassis Section-2 .............................................................. 38
6. ELECTRICAL PARTS LIST......................................... 39
STR-DE485/DE485E

5
STR-DE485/DE485E
SECTION 1
GENERAL This section is extracted
from instruction manual.
List of Button Locations and Reference Pages
5
GB
wdwfwhwjwkwlesedefegehek ej e; ea wg
1 7 84 qs0qa523 6qf qg qjqh qkqlw;qd waws9
List of Button Locations and Reference Pages
Main unit
How to use this page
Use this page to find the location of buttons
that are mentioned in the text.
FM MODE (Models of area code
CEL, CEK only) ed, (Except for
models of area code CEL, CEK)
ef (31)
INPUT MODE qg (21)
IR (receptor) 4(38, 45, 51)
LEVEL 0(20, 27, 55)
M
MASTER VOLUME wd (20, 49)
MD/TAPE qj (21)
MEMORY eh (30, 32)
MENU +/– e; (16, 27, 35, 36)
MENU </> ea (16, 27, 35, 36)
MODE wj (24, 50)
MULTI CHANNEL DECODING
(indicator) (Except for
STR-DE485E) 7(21)
MULTI CH IN (Except for
STR-DE485E) qf (21)
MUTING wf (21, 49)
N – S
NAME 8(35)
PHONES (jack) ek (21)
PRESET/PTY SELECT +/–
(Models of area code CEL, CEK
only) 3(32, 33)
PRESET TUNING +/– (Except
for models of area code CEL,
CEK) 3(32, 53)
PTY (Models of area code CEL,
CEK only) ef (33)
SET UP 6(4, 16, 36, 54)
SHIFT eg (32)
SLEEP (STR-DE485E only)qf
(36)
SURR qd (27, 54)
T – Z
TREBLE +/– qh (29, 54)
TUNER ws (21, 30-32, 35)
TUNING +/– 5(31)
VIDEO 1 qk (21)
VIDEO 2 w; (21)
BUTTON D SCRIPTIONS
`/1 (power) 1(4, 15, 20, 29,
30, 53)
ALPHAB TICAL ORD R
0 – 9
2 CH wh (25)
A – D
A.DEC wk (23–25)
AM (Except for models of area
code CEL, CEK) es (30, 31)
BASS +/– wg (29, 54)
CD ql (21)
CINEMA STUDIO EX A, B, C
9(23, 24)
Digital Cinema Sound (indicator)
qs (23)
DIMMER ej (22)
DISPLAY 2(22, 33, 51)
Display qa (22)
DVD/LD wa (21)
– L
ENTER wl (35)
FM (Except for models of area
code CEL, CEK) ed (30, 31)
FM/AM (Models of area code
CEL, CEK only) es (30, 31)
Illustration number
r
NAME 8(35)
R R
Name of button/part Reference page

6
STR-DE485/DE485E
Operations Using the Remote RM-U306
45
GB
xcept for STR-D 585 area code CA
You can use the remote RM-U306 to operate
the components in your system.
Remote button
description
NX
mM
.>
12 3
45 6
78
0
9
MD/TAPE CD TUNER
TV/VIDEO
VIDEO 2
VIDEO 1 DVD/LD
SYSTEM
STANDBY
>10
SHIFT
CH/PRESET
-
ANT
TV/VTR
SOUND FIELD
–+
MASTER
VOL
TEST TONE MAIN MENU MULTI CH
ENTER
D.SKIP
A.DEC 2CH
MODE
D.TUNING
TOP MENU DVD MENU
ENTER
RETURN
f
F
Gg
SLEEP AV
?/1 ?/1
MENU
TV VOL TV CH
MUTING
O
x
Operations Using the Remote RM-U306
continued
The tables below show the settings of each
button.
Remote Operations Function
Button
SLEEP Receiver Activates the sleep
function and the duration
which the receiver turns
off automatically.
?/1 Receiver Turns the receiver on or
off.
46
GB
Remote button description
(continued)
Remote Operations Function
Button
VIDEO 1 Receiver To watch VCR.
(VTR mode 3)
VIDEO 2 Receiver To watch VCR.
(VTR mode 1)
DVD/LD Receiver To watch DVD or laser
disc.
MD/TAPE Receiver To listen to Minidisc or
audio tape.
CD Receiver To listen to compact disc.
TUNER Receiver To listen to radio
programs.
SHIFT Receiver Press repeatedly to select
a memory page for
presetting radio stations
or tuning to preset
stations.
D.TUNING Receiver Tuner station direct key-
in-mode.
A.DEC Receiver Select AUTO DECODE
mode.
MODE Receiver Selects sound field mode.
2CH Receiver Selects 2CH mode.
TEST Receiver Press to output test tone.
TONE
MAIN Receiver Press this button
MENU repeatedly to select one
of the four cursor modes:
SURR, LEVEL, SET UP
and NAME.
MULTI CH Receiver Selects MULTI CH IN
source.
MENU </> Receiver Selects a menu item.
MENU +/–Receiver Makes adjustment or
change the setting.
MUTING Receiver Mutes the sound from the
receiver.

7
STR-DE485/DE485E
Note : This set can be disassemble according to the following sequence.
SECTION 2
DISASSEMBLY
2-1. CASE
2-1. CASE
(Page 7)
2-2. FRONT PANEL SECTION
(Page 8)
2-3. BACK PANEL
(Page 8)
SET
2-4. DIGITAL BOARD
(Page 9)
2-5. STANDBY BOARD
(Page 9)
2-6. MAIN BOARD
(Page 10)
Note : Follow the disassembly procedure in the numerical order given.
1 two screws
(case 3 TP2)
2 two screws
(case 3 TP2)
3 two screws
(case 3 TP2)
4 cas
e

8
STR-DE485/DE485E
2-2. FRONT PANEL SECTION
2-3. BACK PANEL
5 front panel section
3 two screws
(BVTP3 x 8)
1 CNS4
2 CNP791
4 four screws
(BVTP3 x 8)
1 CNS7
2 CNS8
3 CNP901
4 CNP154
5 two screws
(BVTP3 x 8)
8 two screws
(BVTP3 x 8)
7 two screws
(BVTP3 x 8)
6 five screws
(BVTP3 x 8)
9 screw (BVTP3 x 8)
0 screw (BVTP3 x 8)
qa screw (BVTP3 x 8)
qs screw
(BVTP3 x 8)
qd back panel (HT4)

9
STR-DE485/DE485E
2-4. DIGITAL BOARD
1 CNS4
5 CNS1
6 CNS2
2 CNP6
3 CNP5
8 screw (BVTP3 x 8)
9 bracket (digital)
7 DIGITAL board
4 screw (BVTP3 x 8)
5 STANDBY board
1 CNP915
2 CNP902
3 CNP903
4 three screws
(BVTP3 x 8)
2-5. STANDBY BOARD

10
STR-DE485/DE485E
7 MAIN board
1 CNP801
2 CNP802
5 screw
(BVTP3 x 8)
3 two screws
(BVTP3 x 8)
4 two screws
(BVTP3 x 8)
6 two screws
(BVTP3 x 8)
2-6. MAIN BOARD