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Sony STR-DB900 - Service Manual

Sony STR-DB900
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STR-DB900
AEP Model
UK Model
E Model
SERVICE MANUAL
FM STEREO FM/AM RECEIVER
Sony Corporation
Audio Group
Published by Sony Engineering Corporation
9-879-123-01
2004H0278-1
© 2004.08
SPECIFICATIONS
Ver 1.0 2004.08
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 trademarks of Digital
Theater Systems, Inc.
Amplifier section
POWER OUTPUT
Rated power output in stereo mode
(8 ohms, 1 kHz, DIN) 120 W + 120 W
Reference power output
(8 ohms, 20 Hz – 20 kHz, THD 0.7%)
FRONT*: 100 W + 100 W
CENTER*: 100 W
SURROUND*:100 W + 100 W
SURROUND BACK*:100 W
* Depending on the sound field settings and source being used, there
may be no sound output.
Inputs (Analog) Sensitivity: 500 mV
Impedance: 50 kilohms
Inputs (Digital)
DVD (Coaxial) Impedance: 75 ohms
Outputs
LINE (subwoofer) Voltage: 2 V
Impedance: 1 kilohm
FM tuner section
Tuning range 87.5 – 108.0 MHz
Antenna terminals 75 ohms, unbalanced
Intermediate frequency 10.7 MHz
AM tuner section
Tuning range 531 – 1,602 kHz
Antenna Loop antenna
Intermediate frequency 450 kHz
General
Receiver
Power requirements 230 V AC, 50/60 Hz
Power consumption 130 W
Dimensions (w/h/d) 430 × 85 × 400 mm
including projecting parts and
controls
Mass (approx.) 6.2 kg
Remote control
Remote control system Infrared control
Power requirements 3 V DC with two R6 (size-AA)
batteries
Dimensions 210 × 49 × 25 mm
Mass (approx.) 85 g excluding batteries
Supplied accessories
FM wire antenna (1)
AM loop antenna (1)
Remote commander (1)
R6 (size AA) batteries (2)
Design and specifications are subject to change without notice.

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Questions and Answers

  • R
    Ryan SilvaAug 20, 2025
    What to do if my Sony STR-DB900 says PROTECT?
    • R
      riceyvonneAug 20, 2025
      If your Sony Stereo Receiver displays 'PROTECT', it means irregular current is being output from the speakers. Turn off the power, inspect the speaker connections, and then power it on again. If the issue persists, and the speaker impedance is set to 8 ohms, try setting it to 4 ohms. If it still shows 'PROTECT', turn off the receiver and allow it to cool down for about 10 minutes before turning it back on.
  • S
    Sierra FlowersAug 22, 2025
    How to troubleshoot no sound on my Sony STR-DB900?
    • S
      Sean RivasAug 22, 2025
      If there's no sound coming from your Sony Stereo Receiver, start by ensuring both the receiver and all connected components are powered on. Also, verify that the MASTER VOLUME is not set to the minimum. Check that all speaker cords are correctly connected and that the muting function is off. Lastly, if 'Decode Priority' is set to 'DEC. PCM', change it to 'DEC. AUTO'.
  • W
    William RamirezAug 25, 2025
    What to do if there is no sound from a specific component connected to my Sony STR-DB900?
    • L
      Lindsey CummingsAug 25, 2025
      If you're not getting sound from a specific component connected to your Sony Stereo Receiver, ensure the component is correctly connected to the appropriate audio or digital input jacks. Also, verify that the connecting cords are fully inserted into the jacks on both the receiver and the component.
  • T
    Terri SavageAug 27, 2025
    Why is there a humming or noise coming from my Sony STR-DB900 Stereo Receiver?
    • P
      Pamela DuncanAug 27, 2025
      If you're experiencing a severe humming or noise with your Sony Stereo Receiver, ensure that all speakers and components are securely connected. Check that connecting cords are away from transformers, motors, TVs, or fluorescent lights. If the plugs and jacks are dirty, gently wipe them with a cloth slightly moistened with alcohol.
  • R
    Ryan RodriguezAug 28, 2025
    What to do if there is no sound from one of the front speakers of my Sony STR-DB900?
    • M
      Michelle JenkinsAug 28, 2025
      If you're not getting sound from one of the front speakers on your Sony Stereo Receiver, connect a pair of headphones to the PHONES jack to see if sound is output. If only one channel is output through the headphones, the component may not be correctly connected to the receiver. If both channels output through the headphones, the front speaker may not be correctly connected to the receiver. Check the connection of the front speaker that is not outputting any sound.
  • S
    sotojosephAug 29, 2025
    Why is there no sound from analog 2 channel sources on my Sony Stereo Receiver?
    • C
      Crystal ChristianAug 30, 2025
      If you're not getting any sound from analog 2 channel sources on your Sony Stereo Receiver, check that INPUT MODE is not set to 'COAX IN' nor 'OPT IN'.
  • D
    Dr. Nathan BraunAug 31, 2025
    What to do if there is no sound from the surround back speaker of my Sony Stereo Receiver?
    • D
      Dr. Michael Odonnell DVMSep 1, 2025
      If you're not getting sound from the surround back speaker on your Sony Stereo Receiver, and some discs have no Dolby Digital EX flag, select 'SB DECODING MTRX' in the SET UP menu.
  • A
    Alejandro YoungSep 2, 2025
    Why is there no sound from digital sources on my Sony STR-DB900?
    • K
      kmcmahonSep 2, 2025
      If you're not getting sound from digital sources via the COAX IN or OPT IN jack on your Sony Stereo Receiver, check that INPUT MODE is not set to 'ANALOG'. Also, ensure INPUT MODE is not set to 'COAX IN' for sources from the OPT IN jack, nor set to 'OPT IN' for sources from the COAX IN jack.
  • L
    Levi ShannonSep 4, 2025
    Why is there no sound from the active subwoofer connected to my Sony Stereo Receiver?
    • D
      David MorrisSep 4, 2025
      If there is no sound from the active subwoofer connected to your Sony Stereo Receiver, check that “2CH ST.” is not selected.
  • K
    Kenneth ReedSep 6, 2025
    Why are the surround sound effects not obvious on my Sony STR-DB900 Stereo Receiver?
    • K
      Kevin BellSep 6, 2025
      If the multichannel surround effects are not noticeable on your Sony Stereo Receiver when using Dolby Digital or DTS, first check that the DVD software is recorded in Dolby Digital or DTS. If connected via digital input, verify the audio setting of the component. Ensure the correct audio track is selected on the DVD player and that speakers and components are securely connected. Make sure you've selected the correct component on the receiver and that headphones are disconnected. Also, ensure muting is off. If the protection circuitry has been activated, turn off the receiver, resolve any short-circuit issues, and then turn the power back on after 20 seconds.

Summary

Specifications

Amplifier Section

Details power output, impedance, sensitivity, and voltage.

Servicing Notes

Board Access and Handling

Service position for AMP/DIGITAL boards and removal notes.

Electrical Safety Precautions

Guidelines for checking boards with electricity applied safely.

Diagrams and Schematics

Waveform Analysis

Presents key waveforms for various signal paths in the unit.

IC Block Diagrams

Digital Board ICs

Block diagrams for key ICs on the Digital board.

Amplifier Board ICs

Block diagrams for key ICs on the Amplifier board.

IC Pin Function Descriptions

Digital Board IC206 Description

Detailed pinout and function for IC206 on the Digital board.

Digital Board IC202 Description

Detailed pinout and function for IC202 on the Digital board.

System Control IC202 Pinout

Detailed pinout and function for IC202 (System Control) on Digital board.

Electrical Parts List

Component Breakdown

Lists parts like resistors, capacitors, coils, and semiconductors with references.

Sony STR-DB900 Specifications

General IconGeneral
Power output100 W per channel (8 ohms, 20 Hz-20 kHz, 0.09% THD)
Number of Channels2
Input sensitivity200 mV (line)
Dimensions430 x 157 x 375 mm (W x H x D)
Weight13.2kg
Frequency response10 Hz - 100 kHz
Total harmonic distortion0.09%
Digital inputscoaxial, optical
Video Connectionscomposite
Speaker load impedance8 ohms

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