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Onkyo A-9377 - Service Manual

Onkyo A-9377
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A-9377
SERVICE MANUAL
SERVICE MANUAL
RC-748S
INTEGRATED AMPLIFIER
Black and Silver models
MODEL A-9377(B)/(S)
230 AC, 50Hz
230 AC, 50Hz
B CPP
S CPP
Ref. No. 4140
062009
120/220-240V AC, 50/60Hz
120/220-240V AC, 50/60Hz
B CWT
S CWT
SAFETY-RELATED COMPONENT
WARNING!!
COMPONENTS IDENTIFIED BY MARK ON THE
SCHEMATIC DIAGRAM AND IN THE PARTS LIST ARE
CRITICAL FOR RISK OF FIRE AND ELECTRIC SHOCK.
REPLACE THESE COMPONENTS WITH ONKYO
PARTS WHOSE PART NUMBERS APPEAR AS SHOWN
IN THIS MANUAL.
MAKE LEAKAGE-CURRENT OR RESISTANCE
MEASUREMENTS TO DETERMINE THAT EXPOSED
PARTS ARE ACCEPTABLY INSULATED FROM THE
SUPPLY CIRCUIT BEFORE RETURNING THE
APPLIANCE TO THE CUSTOMER.

Table of Contents

Other manuals for Onkyo A-9377

Preview: Instruction Manual
Instruction Manual20 pages

Questions and Answers

  • B
    blairrobinJul 26, 2025
    Why is there no sound coming from my Onkyo Amplifier A-9377?
    • G
      Gina WardJul 26, 2025
      If the MUTING indicator is flashing, press the [MUTING] button on the remote controller to unmute the Onkyo A-9377. Also ensure that all audio plugs are fully inserted, the inputs and outputs of all components are correctly connected, the speaker cable polarity is correct, the correct input source is selected, no cables are bent or damaged, and the SPEAKERS selector is correctly set (not OFF). If you are using a turntable with an MC type cartridge, ensure you are using an MC head amp or MC transformer.
  • S
    Selena SpencerJul 30, 2025
    How to fix an Onkyo A-9377 Amplifier remote controller that is not working?
    • J
      Jacob RamirezJul 30, 2025
      Ensure that the remote controller is not too far from the A-9377 and has a clear path to the A-9377's remote control sensor. Also, make sure that the A-9377 isn't in direct sunlight or exposed to inverter-type fluorescent lights. If the A-9377 is in a rack or cabinet with colored glass doors, the remote controller may not work well when the doors are closed. Finally, make sure that the batteries are installed correctly (page 10) and try new batteries, avoiding mixing old and new types (page 10).
  • E
    Evan DelacruzAug 3, 2025
    How to troubleshoot an Onkyo Amplifier A-9377 that will not turn on?
    • S
      Sara MunozAug 3, 2025
      Make sure the power cord is properly plugged into the wall outlet. If it is, unplug the power cord, wait ten seconds or more, then plug it in again.
  • T
    Tyler ParksAug 8, 2025
    What to do if my Onkyo Amplifier A-9377 locks up due to interference?
    • M
      Megan SimmonsAug 8, 2025
      To address this issue, unplug the power cord from the wall outlet, wait at least ten seconds, and then plug it back in again.
  • S
    Sheena ToddAug 12, 2025
    Why do the tone controls not work on my Onkyo Amplifier A-9377?
    • M
      Marc DeleonAug 12, 2025
      If the TONE/DIRECT indicator is illuminated, the Direct function is enabled, and the tone controls are disabled. To regain control, press the [TONE/DIRECT] button to turn the function off; the TONE/DIRECT indicator will then turn off (page 16).
  • S
    Sarah CastilloAug 16, 2025
    What causes noise in my Onkyo Amplifier A-9377 and how do I fix it?
    • M
      mgibsonAug 16, 2025
      Avoid bundling audio cables with power cords or speaker cables, as this can degrade audio performance. Additionally, the noise might be due to an audio cable picking up interference; try repositioning the cables.
  • B
    burchedwardAug 20, 2025
    What to do if SPEAKERS A and B indicators are both flashing on my Onkyo Amplifier A-9377?
    • D
      Daniel ParkAug 20, 2025
      Set the POWER switch to OFF immediately, remove the power cord from the wall outlet, and contact your Onkyo dealer.

Summary

ONKYO SERVICE MANUAL

Model Identification

Identifies the specific model and type of audio equipment.

Critical Safety Component Warning

Important safety information regarding critical components and shock hazards.

Exploded View

Component Identification and Placement

Visual layout of parts with reference numbers for assembly and service.

Block Diagram

Amplifier Functional Block Overview

Illustrates the main signal paths and functional units of the amplifier.

Schematic Diagram - Main

Main Circuitry Schematic

Detailed schematic of the amplifier's main electronic components and connections.

Schematic Diagram - Power

Power Supply and AC Input Schematic

Detailed schematic of the amplifier's power supply and AC input sections.

Schematic Diagram - Front

Front Panel and Control Circuit Schematic

Schematic detailing front panel controls, MICOM, and input selection.

Exploded Views Parts List

Component Part Numbers and Descriptions

Lists parts with reference numbers, descriptions, and part numbers for service.

Exploded Views Parts List

Additional Component Details

Exploded Views Parts List

Further Component Listings

Onkyo A-9377 Specifications

General IconGeneral
Package depth549 mm
Package width428 mm
Package height258 mm
Dimensions (WxDxH)435 x 15 x 348 mm
Power requirementsAC 220-230 V, 50/60 Hz
Impedance4 Ω
Frequency range10 - 70000 Hz
Signal-to-Noise Ratio (SNR)96 dB
Total Harmonic Distortion (THD)0.08 %
Product colorSilver
Package weight10700 g
Power consumption (typical)286 W
Weight and Dimensions IconWeight and Dimensions
Weight8800 g

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