rogating the USB socket and insertion of a clean USB stick containing only the system firmware will initiate a complete recovery automatically.

IC164 is a MiniLogic ML61C282PR precision voltage detector, with a threshold of 2.8V, built in hysteresis and a CMOS output, used to reset IC162 at power on.

IC163 is an Intersil USB switch, type ISL54220, which routes the USB socket on the rear panel either to the Venice 6.2 module, for normal audio applications, or to IC162 when the system SW is being up- graded from a USB stick. Note that it is positioned underneath the Venice 6.2 module, close to the USB socket.

The USB high side power switch IC168 is close to IC163. It is a Richtek RT9702A fed from the main +5V power supply. It is rated at 1.1 amps output and can flag up a fault condition on the USB bus from pin 3; this is routed to IC162.

The Frontier Silicon Venice 6.2WB module is plugged into the input board via a 64 way connec- tor CN62. This WB version of the module supports Band 3 DAB/DAB+ digital radio for use in Europe, Australia, Canada, Korea and other Digital Radio markets. It also supports USB2, and Ethernet up to 100 Mb/s, enabling the AVR400 to be a network audio client. A spare copy of the AVR400’s unique MAC (Media Access Controller) address can be found on the screening can of the Venice 6.2 module. Its FM radio function is not used.

The Venice 6.2 is operated in slave mode via the UART pins 9 and 10 on CN62. These connect to the sub micro IC154. The USB I/O signal pins are 11 and 12, routed to the USB switch IC163. The other USB pins are not used. Pins 26, 27, 28 and 29 make up an SPI bus to work with the Ethernet PHY IC161 (pin 33 receives interrupts from IC161).

Audio is decoded inside the Venice 6 (i.e. from AAC, FLAC, MP3, WMA or WAV) and sent out by two routes. Pin 32 carries an SPDIF signal (at 48ks/s) for the main system and pins 64 and 63 carry L/R linear audio for zone 2 to the volume control IC101.

The Venice 6.2 requires +3V3 at up to 300mA average and +1V2 at 200mA average for the core of its main processor. 3V3 is provided from the main +5V supply via the three terminal regulator IC165 – this also provides the soft start signal to pin 2 of the 1V2 regulator IC167 (also fed from +5V with some volt- age drop provided by diodes D803/4). Both regulators are SM types, positioned underneath the Venice 6.2 module.

IC161 is a Micrel KSZ8851 single port Fast Ethernet MAC/PHY controller with an SPI interface. It has a 12KB receive bμFfer and a 6KB transmit bμFfer. It has its own 25MHz crystal oscillator X777. Its 4 I/Osgo to the Ethernet socket JK52 on the back panel. Its +3V3 power rail is derived from the board’s +5V supply via the three terminal regulator IC166.

AVR400 RS232 board

This is a daughter board connected to the Input Board via an 18 way plug and socket BN71. The circuitry is shown on page 14 of the schematic diagram.

It contains two 9 way D-type board mounted plugs JK71 and JK72. JK71 is for RS232 control of the AVR400. JK72 is used to control an iPod or iPhone via an Arcam rDock or rLead (the latter also supports iPads).

The RS232 dual transmitter and receiver IC73 is an ST3232 run from the standby +5V supply via D721/ R727 and a series pnp transistor Q722 in common emitter mode referred to the +12V rail. Q721 provides

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Arcam service manual AVR400 RS232 board
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AVR400 specifications

The Arcam AVR400 is a high-performance AV receiver designed to provide an immersive home theater experience. As part of Arcam’s esteemed lineup, the AVR400 combines advanced technology with exceptional sound quality, catering to audiophiles and home cinema enthusiasts alike.

At the heart of the AVR400 is its impressive power amplification, providing 100 watts per channel across 7 channels, ensuring a robust performance capable of driving a wide range of speakers. This power output is complemented by a high-current design, which means the receiver can handle dynamic audio passages without distortion, offering clarity in both subtle and explosive soundtracks.

One of the standout features of the AVR400 is its support for various surround sound formats, including Dolby TrueHD and DTS-HD Master Audio. This allows for an unparalleled audio experience, transporting users right into the heart of the action. Additionally, the AVR400 is equipped with the latest HDMI inputs, ensuring compatibility with a multitude of high-definition sources, including Blu-ray players, gaming consoles, and streaming devices.

The AVR400 also boasts advanced video processing capabilities, supporting 4K pass-through as well as upscaling of lower-resolution content to 4K. This makes it an ideal choice for users looking to future-proof their home theater setup, as it can seamlessly integrate with modern 4K televisions while enhancing the quality of older content.

User-friendliness is another essential characteristic of the Arcam AVR400. It comes equipped with an intuitive on-screen menu system that simplifies the setup process. The inclusion of an automatic calibration system helps optimize speaker settings in accordance with the room acoustics, ensuring users achieve the best sound possible from their setup.

Furthermore, the network features of the AVR400 allow for streaming audio from various online services and wireless devices. Built-in support for DLNA enables users to access their media library wirelessly, while the USB input allows for direct playback from flash drives or external hard drives.

In terms of build quality, the Arcam AVR400 embodies the brand’s commitment to excellence. With a sleek design, high-quality materials, and an engineered chassis that minimizes vibration and interference, the AVR400 is not only visually appealing but also built to deliver performance over time.

In summary, the Arcam AVR400 is a feature-rich AV receiver offering a perfect blend of power, precision, and versatility. Whether for movie nights or music listening, it stands out as a reliable choice for those seeking high-quality audio and video reproduction in their home entertainment systems.
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