Nokia 6150 Manuales De Servicio

PAMS

Technical Documentation

HFU–2

Page  4

Original 11/97

HF unit

HFU–2

0694049

Advanced handsfree unit

HF module

ED2

0200948

ED2 Advanced hadsfree module

Assembly parts

MHFU–2

0261602

Mechanical Parts

Phone not connected (sleep mode):

When the phone is not connected the current consumption of
the device has been minimized. The switching mode power
supply (SMPS) and audio circuits has been turned off. HFU–2
is only waiting a phone to be connected.

Phone connected (active mode):

When the phone is connected to the HFU–2 it goes into the ac-
tive mode. In the active mode the device provides charging
current to the phone. It also can provide hands free call option
using  the external speaker and the external microphone or
micspeaker unit. If more private call wants to be made, the
phone itself can be used as a handset without losing the exter-
nal antenna connection or with handset (option).

The phone controls all functions of HFU–2. In the active mode
the HFU–2 sends all state transitions to phone via mbus.

HFU–2 also provides car radio mute function during call.

HFU–2 can control the mobile antenna motor if it is installed to
the car.

X300 / 6

GND

0

VDC

X300 / 1

VB

8.0

16

VDC (working)

X300 / 1

VB

10.8

13.5

16

VDC (spec. fulfill)

X300 / 1

VB

0.05

1

2

IDC/A (operating)

X300 / 1

VB

0.2

0.8

1

IDC/mA (sleep
mode)