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Sony STR-DE485 - Service Manual

Sony STR-DE485
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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 –

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Questions and Answers

  • D
    Daniel SchwartzSep 23, 2025
    How to fix recording issues on Sony STR-DE485?
    • G
      Gavin OconnorSep 23, 2025
      If you're experiencing recording issues with your Sony Stereo Receiver: * Check that the components are connected correctly. * Select the source component using the function buttons. * Ensure INPUT MODE is set to 'ANALOG' when recording from a digital component connected to the analog MD/TAPE terminals.
  • C
    Christina DanielAug 25, 2025
    How to improve FM reception on Sony STR-DE485?
    • J
      Jamie SampsonAug 25, 2025
      To improve FM reception on your Sony Stereo Receiver, use a 75-ohm coaxial cable (not supplied) to connect the receiver to an outdoor FM antenna.
  • C
    Christian RodriguezAug 25, 2025
    How to enable surround effect on Sony STR-DE485 Stereo Receiver?
    • R
      Raymond TerryAug 26, 2025
      To enable the surround effect on your Sony Stereo Receiver, ensure the sound field function is turned on by pressing the MODE button.
  • A
    Angela MclaughlinAug 27, 2025
    How to balance left and right sound on Sony STR-DE485?
    • C
      Claudia CantrellAug 27, 2025
      To correct unbalanced or reversed left and right sounds on your Sony Stereo Receiver, adjust the balance parameters in the LEVEL menu.
  • S
    sarah00Aug 27, 2025
    Why is there no sound from my Sony Stereo Receiver?
    • J
      Jacqueline MillerAug 27, 2025
      If there is no sound or only a very low-level sound from your Sony Stereo Receiver, ensure the speakers and components are securely and correctly connected, the receiver and all components are turned on, and the MASTER VOLUME control is not set at VOL MIN. Also, check that headphones are not connected and that the muting function is off by pressing MUTING. If a short circuit activated the protective device, turn off the receiver, fix the short-circuit issue, and then turn it back on.
  • M
    Michael StaffordSep 13, 2025
    What to do if my Sony STR-DE485 Stereo Receiver has no sound?
    • A
      Alex JeffersonSep 13, 2025
      If your Sony Stereo Receiver isn't producing sound, or the sound is very low, try these steps: * Ensure speakers and components are securely and correctly connected. * Verify the receiver and all components are powered on. * Check that the MASTER VOLUME control is not set at VOL MIN. * Deactivate muting by pressing the MUTING button. * Disconnect any headphones. * If a short circuit activated the receiver's protective device, turn off the receiver, resolve the short-circuit, and then power it on again.
  • S
    stevensanchezSep 12, 2025
    What to do if the RDS information that you want does not appear on my Sony Stereo Receiver?
    • A
      Amanda ShepardSep 12, 2025
      Contact the radio station to check if they provide the RDS service you are looking for. If they do, the service may be temporarily unavailable on your Sony Stereo Receiver.
  • L
    Lori RomeroSep 12, 2025
    Why is there no sound from the active sub woofer of my Sony STR-DE485 Stereo Receiver?
    • R
      Robert GriffithSep 12, 2025
      There is no sound output from the SUB WOOFER terminal depending on the sound field of your Sony Stereo Receiver.
  • V
    Virginia TuckerSep 4, 2025
    How to fix unbalanced left and right sounds on my Sony STR-DE485?
    • F
      frank67Sep 4, 2025
      To fix unbalanced or reversed left and right sounds on your Sony Stereo Receiver, first check that the speakers and components are connected correctly and securely. If the issue persists, adjust the balance parameters in the LEVEL menu.
  • K
    Kayla CurtisSep 2, 2025
    What to do if there is no picture on the TV screen connected to my Sony STR-DE485?
    • S
      swardSep 2, 2025
      If there is no picture or an unclear picture on the TV screen connected to your Sony Stereo Receiver, select the appropriate function on the receiver and set your TV to the appropriate input mode. Also, try moving your TV away from the audio components.

Summary

STR-DE485;DE485 E Service Manual

Safety Checks and Leakage Testing

Safety Check-out and Leakage Test

Procedures for ensuring safety after service, including AC leakage testing.

Model Identification and Component Warnings

Mapping model numbers and warning about safety-critical components.

General Information and Button Guide

Remote Control Operation

Instructions for operating the unit using the RM-U306 remote control.

Test Mode Operations

Preset and Configuration Modes

Procedures for factory preset reset, sound field clear, and AM channel step selection.

Diagrams and Schematics

Block Diagrams by Section

Block diagrams illustrating signal flow for Tuner/Audio, Digital, Video/Display, and Power sections.

Schematic Diagrams by Section

Detailed schematics for Main, Digital, Video, Display, and Power sections.

Exploded Views

Electrical Parts List

Sony STR-DE485 Specifications

General IconGeneral
Impedance8 ohms
Digital Inputs1 Optical
TypeStereo Receiver
Audio Channels5.1
Video ConnectionsComposite
Tuner TypeAM/FM
Frequency Response10 Hz - 50 kHz
Dimensions430 x 145 x 298 mm
Weight17.6 lbs
Dimensions (alternate)17.1 x 5.6 x 13.8 inches
Weight (alternate)17.6 lbs
Outputs2 Audio, 1 Video

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