Nokia 9000i Service Manual
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After SalesTechnical DocumentationRAE/RAK–1NCARK60 Installation GuidePage 10 Original, 08/96Car Radio Muting CRMThe Communicator offers a feature that can mute the car radioautomatically during a conversation. This feature is convenient andprovides for safer hands–free operation. The Car Radio Muting feature isbased on a grounded line, so it means that in standby, the yellow wire(XCRM) is not grounded and car radio works normally, but during a call,line is grounded and car radio is muted. The maximum load that this linecan handle is 250 mA. Note that an auxiliary relay or muting unit must beused when the car radio doesn’t have a mute feature available.When a relay is used this should be connected in series with the car radiomain supply. A 200 mA fuse should be used to protect the XCRM output inevent of a short circuit. Some radios have separate supplies for amplifiersand motors, and another for memory backup purposes. Very often theseradios also have a secret code system, which activates itself if a break inthe memory supply is detected. Be careful when installing the relay not tobreak the memory supply (usually marked ACC or +MEM), but to installthe relay in the main supply feed.CARRADIOBosch P/N 0–332–204–15012 V, 30 A. SPDT12 V d.c.12 V d.c.Supply forcar radioFuse 200 mA(not supplied)To XCRM line(yellow wire)858787A3086GNDFigure 4. Radio Muting CircuitAnother possibility is to use a special muting unit, which mutes the radioby connecting load resistors to the speaker lines of the car radio. Fourloudspeakers can be muted and the maximum permitted power is 20watts per channel. The muting unit can also be used as a relay to cut themain supply feed of the car radio.Ignition Sense IGNSThe Ignition Sense feature prevents your Communicator from draining thecar battery by executing an auto power off in 20 seconds after the ignitionkey has been turned off. The blue wire of the power cable is used for theignition sense feature. The use of ignition sense is recommended toprevent accidental draining of the car’s battery. The wire is connected viaa 200 mA fuse to a 12/24 volt potential that is controlled by the ignitionkey. Do not connect it directly to the high voltage sections of the ignitioncircuit.All installations should take into account any special requirements of thecustomer. However, should the customer require an installation that isillegal or unsafe, these facts must be pointed out to the customer and apolicy of non–compliance adopted. |
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