Audio And Visual System System Description

Compact Disc (CD) players or Digital Versatile Disc (DVD) players use a laser pickup to read digital signals recorded on CDs or DVDs. By converting the digital signals to analog, they can play music, video, etc.

CAUTION:

Because the CD player uses an invisible laser beam, do not look directly at the laser pickup. Be sure to only operate the player as instructed.

HINT:

1. Do not disassemble any part of the CD player or DVD player.
   
2. Do not apply oil to the CD player or DVD player.
   
3. Do not insert anything other than a CD or a DVD into the CD player or DVD player.
   

What is AVC-LAN?
AVC-LAN, an abbreviation for "Audio Visual Communication Local Area Network", is a united standard developed by the manufacturers in affiliation with Toyota Motor Corporation. This standard pertains to audio and visual signals as well as switch and communication signals.

Purpose:
Recently, car audio systems have rapidly developed and the functions have vastly changed. The conventional car audio system is being integrated with multi-media interfaces similar to those in navigation systems. At the same time, customers are demanding higher quality from their audio systems. This is an overview of the standardization background. Its specific purposes are as follows.

1. To solve sound problems, etc., caused by using components of different manufacturers through signal standardization.
   

2. To allow each manufacturer to concentrate on developing products they do best. From this, reasonably priced products can be produced.
   

   HINT:

   1. If a +B or GND short is detected in the AVC-LAN circuit, communication is interrupted and the audio system will stop functioning.
      
   2. If an audio system is equipped with a navigation system, the multi-display unit acts as the master unit. If a navigation system is not equipped, the audio head unit acts as the master unit instead.
      
   3. The radio receiver assembly provides resistance to make communication possible.
      
   4. A car audio system with an AVC-LAN circuit has a diagnostic function.
      
   5. Each component has a specified number (3-digit) called a physical address. Each function has a number (2-digit) called a logical address.
      
   6. Components of the audio system communicate with each other via the AVC-LAN.