Nokia 2608 Service Manual page 83

RM-376
System Module and User Interface
Introduction..........................................................................................................................................................................................................5-4
Phone description........................................................................................................................................................................5-4
Energy management
Battery and
Backup battery...............................................................................................................................................................................5-9
Normal and extreme
Power key and system
Power off.........................................................................................................................................................................................5-12
Modes of operation..................................................................................................................................................................5-13
Power distribution....................................................................................................................................................................5-14
Clock distribution.......................................................................................................................................................................5-16
USB....................................................................................................................................................................................................
Charger interface.............................................................................................................................................................................................5-22
User Interface..................................................................................................................................................................................................
Displ ay module...........................................................................................................................................................................5-23
Keyboard and other
Audio concept..........................................
Audio HW architecture...........................................................................................................................................................5-26
Internal mic
Internal earpiece........................................................................................................................................................................5-27
Internal speaker..........................................................................................................................................................................5-28
Vibra circuitry...................................................................................................
AV Connector.................................................................................................................................................................................5-29
Baseband technical
External interfaces................................
Charger connector and charging interface connections & electrical
RF Description....................................................................................................................................................................................................5-31
Block diagram.............................................................................................................
Receiver (RX)..................................................................................................................................................................................5-31
Transmitter
Frequency mappings...................................................................................................................................................................................5-35
CDMA 800 frequencies............................................................................................................................................................5-35
Issue1
.....................................................................................................................................................................................5-6
charging.................................................................................................................................................................5-6
voltages............................................................................................................................................5-9
power-up..................................................................................................................................5-10
keys.....................................................................................................................................................5-24
.........................................................................................................................................................
rophone...............................................................................................................................................................5-27
specifications......................................................................................................................................................5-30
(TX)..........................................................................................................................................................................5-32
Company Confidential
Copyright © 2008 Nokia. All rights reserved.
Table of Contents
.....................................................................................................................................5-30
.............................................................................5-28
characteristics...................5-30
.................................................................5-31
...5-22
...5-23
5-26
Page 5-3