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Marantz SR7400 - Service Manual

Marantz SR7400
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SR7400 / PS7400
Part no. 37AW855010
First Issue 2003.11
ecm
Please use this service manual with referring to the user guide ( D.F.U. ) without fail.
Service
Manual
SR7400
TABLE OF CONTENTS
SECTION PAGE
1. TECHNICAL SPECIFICATIONS ............................................................................ 1
2. TECHNICAL DESCRIPTION ................................................................................. 4
3. WIRING DIAGRAM................................................................................................ 7
4. BLOCK DIAGRAM................................................................................................. 9
5. SCHEMATIC DIAGRAM ...................................................................................... 11
6. PARTS LOCATION .............................................................................................. 29
7. IC DATA................................................................................................................ 42
8. EXPLODED VIEW AND PARTS LIST ................................................................. 53
9. POWER AMPLIFIER ADJUSTMENT .................................................................. 57
10. SERVICE MODE ................................................................................................. 58
11. SYSTEM ERROR ................................................................................................ 60
12. UPDATE FIRMWARE .......................................................................................... 61
13. ELECTRICAL PARTS LIST ................................................................................. 63
AV SURROUND RECEIVER SR7400
UP
SELECTOR
VOLUME
DOWN
MEMORY
TUNING
MODE
F/P
CLEAR
7.1CH INPUT
AUX2
MUTE
MULTI SPEAKERMULTISPEAKERS A/B
POWER ON/STANDBY
PHONES
ENTER
STANDBY
AUX1 INPUT
S-VIDEO VIDEO L AUDIO R
DSS/VCR2
AUX1
VCR1
DVD
TV
CD
CD-R
TAPE
TUNER
S-DIRECT
SELECT
DIGITAL
PS7400
AV Surround Receiver
SR7400 /
K1G/L1G/N1B/U1B
/N1S/S1G
PS7400 /
F1N
AV Surround Ampli er
www.electronicsrepair.net

Table of Contents

Other manuals for Marantz SR7400

Preview: User Guide
User Guide52 pages
Preview: Specifications
Specifications1 page
Preview: Specification
Specification17 pages

Questions and Answers

  • D
    danielmillerAug 27, 2025
    What to do if my Marantz Stereo Receiver has no sound and picture even when power is on?
    • C
      Christopher SimmonsAug 27, 2025
      If your Marantz Stereo Receiver has no sound and picture, even when the power is on, consider these potential causes: * The mute function may be activated. Deactivate mute using the remote control. * The input cable might not be correctly connected. Refer to the connection diagram and ensure all cables are properly connected. * The master volume could be turned down completely. Adjust the master volume to an audible level. * The function selector might be in the wrong position. Select the correct function.
  • C
    Christina BrownAug 27, 2025
    Why is there no speaker output from my Marantz Stereo Receiver?
    • D
      Daniel RogersAug 27, 2025
      If there is no speaker output from your Marantz Stereo Receiver, it might be because headphones are connected to the headphone jack. Disconnect the headphones, as the speakers will not output sound when headphones are connected.
  • F
    fvalentineAug 28, 2025
    What to do if there is no audio output from the center channel speaker on Marantz Stereo Receiver?
    • M
      morganmichelleAug 28, 2025
      If there's no audio output from the center channel speaker on your Marantz Stereo Receiver: * Check that the center speaker cable is correctly connected. * Ensure that STEREO is not selected for Surround mode. When STEREO is selected, no sound will be output from the center speaker; select another Surround mode. * Verify that Center is not set to NONE in SETUP mode. Make the correct setting.
  • C
    Christopher MackAug 28, 2025
    What to do if there is no audio output from the surround speakers on Marantz Stereo Receiver?
    • D
      Denise PatelAug 29, 2025
      If there is no audio output from the surround speakers on your Marantz Stereo Receiver: * Verify that the surround speaker cable is correctly connected. * Ensure that STEREO is not selected for Surround mode. When STEREO is selected, no sound will be output from the surround speakers; select another Surround mode. * Check that Surround is not set to NONE in SETUP mode. Make the correct setting.
  • S
    Samuel JohnstonAug 29, 2025
    What to do if there is no audio output from the surround back speakers on Marantz Stereo Receiver?
    • J
      Jacob JohnsonAug 29, 2025
      If you are not getting any audio output from the surround back speakers on your Marantz Stereo Receiver: * Ensure the surround back speaker cable is correctly connected. * Confirm that the surround mode is set to EX/ES. * Check that Surround back is not set to NONE in SPEAKERS SIZE SETUP. Make the correct setting.
  • K
    Kyle MorrowAug 30, 2025
    Why is there no output to Sub Woofer Out on my Marantz Stereo Receiver?
    • N
      Nicole WoodAug 30, 2025
      If there is no output to the Sub Woofer Out on your Marantz Stereo Receiver, it may be because Sub-woofer = NONE has been selected in SETUP mode. Select Sub-woofer = YES.
  • H
    Hannah MoralesAug 30, 2025
    What to do if a specific channel does not produce output on my Marantz Stereo Receiver?
    • W
      William WattsAug 30, 2025
      If a specific channel does not produce output on your Marantz Stereo Receiver, check the encoded channel on the source side to ensure there is content recorded there.
  • F
    Frances JenkinsAug 25, 2025
    How to fix Marantz Receiver remote control when it fails?
    • A
      Ashley AtkinsonAug 25, 2025
      If the remote control is not working with your Marantz Receiver, first, try replacing all the batteries with new ones. If that doesn't work, make sure the remote controller's function-key setting is correct by selecting a different position from which the equipment will be controlled. Also, ensure that you are close enough to the SR7400 and that nothing is blocking the signal between the remote and the receiver. Move closer to the SR7400 or remove any obstructions.
  • M
    mwhiteSep 1, 2025
    Why is noise heard during AM reception on Marantz Receiver?
    • B
      Brandon LopezSep 1, 2025
      If you're hearing noise during AM reception on your Marantz Receiver, it could be due to interference from other electrical fields. Try changing the location where the AM indoor antenna is set up.
  • J
    John EstradaSep 1, 2025
    Why is noise heard during FM reception on Marantz Receiver?
    • B
      Barbara NguyenSep 1, 2025
      If you're hearing noise during FM reception with your Marantz Receiver, the radio waves from the broadcasting station might be weak. Consider installing an FM outdoor antenna to improve reception.

Summary

Marantz Design and Service Information

Ordering Replacement Parts

Details on how to order replacement parts by mail or fax.

Critical Service Safety Test

Technical Specifications

Technical Description of Audio Technologies

DTS and Dolby Surround Sound Formats

Details on DTS, DTS-ES, Neo:6, Dolby Digital, Pro Logic IIx.

DTS 96;24 and SRS Circle Surround II

Explanation of high-resolution audio and SRS CS-II technologies.

Wiring Diagram

Block Diagram

Schematic Diagrams: Input PCB

Parts Location: PCB Layouts

Integrated Circuit (IC) Data

IC Data: LC89057 W VF4-E

Pinout and function details for specific integrated circuits.

Exploded View and Parts Identification

Component Parts List

Detailed list of all parts with part numbers and descriptions.

Power Amplifier Adjustment Procedure

Idling Current Alignment

Step-by-step guide to adjust the idling current for each channel.

Service Mode and Diagnostics

System Error Codes and Troubleshooting

Firmware Update Procedures

DSP Firmware Update (Mode 1)

Procedure for updating the DSP software via RS-232C.

CPU Firmware Update (Mode 2)

Procedure for updating the CPU software via RS-232C.

Electrical Parts List: Component Details

Marantz SR7400 Specifications

General IconGeneral
Number of Channels7
DTS ProcessingDTS, DTS-ES, DTS Neo:6
Component Video Inputs3
TunerAM/FM
TypeAV Receiver
THD0.08%
Input Sensitivity200 mV
Signal to Noise Ratio105 dB
Frequency Response10 Hz - 100 kHz
Weight28.7 lbs
Total Harmonic Distortion0.08%
Signal-to-Noise Ratio105 dB
HDMI InputsNo
Preamp OutputsYes
Output Power (8 ohms)105 watts per channel
Digital inputs3 optical, 2 coaxial
Input Sensitivity/Impedance200 mV / 47k ohms

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