Television / Monitor: Description and Operation
GF82.60-P-3118RDJ Digital TV Tuner, Component Description
MODEL 172.4
- with CODE (865) TV tuner
A90/3 TV digital tuner
Location
The digital TV tuner is located in the trunk under the trunk mat on the crossmember.
Task
^ Receive signals
^ Demodulating and decoding signals
^ Transmit signals
Receive signals
^ Direct lines
^ Media Oriented System Transport (MOST)
Media Oriented System Transport (MOST)
The TV digital tuner is a subscriber of the MOST, via which it communicates with the COMAND controller unit (A40/3).
Direct lines
- Power supply over circuit 31 and circuit 30g (up to 31.5.2012) or circuit 30 (as of 1.6.2012), over a direct line each
- Electronic wake-up for MOST via a direct line
- TV 1 antenna amplifier (A94/1) via a coaxial cable
- TV 2 antenna amplifier (A94/2) via a coaxial cable
- FM 2, DAB and TV 3 (A2/19) antenna amplifier via a coaxial cable
Demodulating and decoding signals
The TV signals that are received via the antenna amplifier are evaluated internally and separated into video and audio signals.
Transmit signals
Signals are sent through the following lines:
^ Direct line
^ MOST
Direct line
- Phantom power supply to following antenna amplifiers
- TV 1 antenna amplifier
- TV 2 antenna amplifier
- FM 2, DAB and TV 3 antenna amplifier
- Transmit video signals to the COMAND controller unit via Y/C lines
MOST
The TV digital tuner is a subscriber of the MOST, via which it communicates with the COMAND controller unit. The audio signals are transmitted to the COMAND controller unit or the sound system amplifier control unit (N40/3) (with code (810) Sound system).
Design
The TV digital tuner is delivered with a "B-CAS card". In vehicles up to 31.5.2012 the card reader is sealed in the digital TV tuner with a cover, to prevent any unauthorized removal of the "B-CAS card".
As of 1.6.2012 the "B-CAS card" is a Subscriber Identification Module (SIM) card version and it can be plugged into the SIM card reader. The SIM card reader does not have a cover.
