Do you have a question about the Onkyo HTR-990 and is the answer not in the manual?
Identifies the specific AV receiver model covered in the manual.
Highlights critical components requiring caution due to fire/shock risk.
Provides a block-level view of the audio processing and amplification circuitry.
Illustrates the signal flow for video processing and input/output.
Details the components and connections for various audio input sources.
Outlines the structure and components of the power amplifier section.
Covers the digital audio processing, DAC, and microprocessor sections.
Details the video processing, input/output, and related circuitry.
Details the power supply circuitry, including fuses and transformers.
Covers the VMPU and power distribution circuitry.
Details the circuitry for switching between multiple HDMI input sources.
Covers the HDMI interface and related signal processing components.
Details the function and components of the video processing unit.
Outlines the digital signal processing and audio circuitry.