Antenna Motor Control Amc; Fig 4 Car Radio Muting Crm; Fig 5 Antenna Motor Control Amc - Nokia CARK-91H Technical Documentation Manual

NPM-2NX
Car Kit
tion. This feature is convenient and provides for safer handsfree operation. The car radio
muting feature is based 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. Note that an auxiliary relay or muting unit must be used when
the car radio does not have a mute feature available.
When a relay is used, connect of series with the car radio main supply. A 200 mA fuse
should be used to protect the XCRM output in event of a short circuit. Some radios have
separate supplies for amplifiers and motors, and another for memory backup purposes.
Very often these radios also have a secret code system, which activates itself if a break in
the memory supply is detected. Be careful when installing the relay not to break the
memory supply (usually marked ACC or +MEM), but to install the relay in the main sup-
ply feed.
GND
To XCRM line
(yellow wire)
Another possibility is to use a special muting unit, which mutes the radio by connecting
load resistors to the speaker lines of the car radio.

Antenna Motor Control AMC

The antenna motor control offers a feature, green wire of the system cable (AMC), that
may be used to control different devices on and off. The voltage in this output is +12 V
whenever the phone is on. If the phone is turned off, the voltage disappears. The maxi-
mum output current is 200 mA; therefore, for example, motorized antenna must be con-
trolled via a relay (see diagram below).
Bosch P/N 0–332–204–150 12 V, 30 A.
SPDT
12 V d.c.
Supply for device
From AMC line (green
wire)
All installations should take into account any special requirements of the customer.
However, should the customer require an installation that is illegal or unsafe, these facts
Page 8
Figure 4: Car Radio Muting CRM
87A
CAR
RADIO
87
85
Figure 5: Antenna Motor Control AMC
30
86
Fuse 1 A
ãNokia Corporation
CCS Technical Documentation
Bosch P/N 0–332–204–150
12 V, 30 A. SPDT
12 V d.c.
30
Supply for
car radio
12 V d.c.
86
Fuse 200 mA
(not supplied)
87A
CONTROLLED
DEVICE e.g.
87
MOTOR ANTENNA
85
GND
GND
Issue 1 07/02