Nokia 1650, Service Manual, Page: 92 / 109

Table of Contents
Block diagram ......................................................................................................................................................... 6–5
System module block diagram ........................................................................................................................ 6–5
Functional description ...................................................................................................................................... 6–5
Baseband description ............................................................................................................................................ 6–5
UPPCosto ........................................................................................................................................................... 6–5
LITTI .................................................................................................................................................................... 6–6
Modes of operation ........................................................................................................................................... 6–6
Audio function description ............................................................................................................................... 6–6
External audio connector ................................................................................................................................. 6–7
External signals and connections .................................................................................................................... 6–8
Interfaces ................................................................................................................................................................ 6–9
RF/BB Interface .................................................................................................................................................. 6–9
LCD interface ...................................................................................................................................................... 6–9
Keyboard ......................................................................................................................................................... 6–10
SIM interface ................................................................................................................................................... 6–12
Battery connector ........................................................................................................................................... 6–13
Battery BL-5C ................................................................................................................................................... 6–13
PWB outline .................................................................................................................................................... 6–14
RF description ...................................................................................................................................................... 6–14
Frequency band, power and multi-slot class ............................................................................................... 6–14
Transmitter Architecture Description .......................................................................................................... 6–14
Digitally Controlled X-tal Oscillator .............................................................................................................. 6–15
List of Tables
Table 6 Connector for External Audio Accessories .............................................................................................. 6–8
Table 7 System connector ..................................................................................................................................... 6–8
Table 8 SIM interface ........................................................................................................................................... 6–12
Table 9 Battery IF ................................................................................................................................................ 6–13
Table 10 Frequency bands and TX power class ................................................................................................ 6–14
List of Figures
Figure 80 Module block diagram .......................................................................................................................... 6–5
Figure 81 Audio block diagram ............................................................................................................................. 6–7
Figure 82 4-pole jack plug for audio accessory ................................................................................................... 6–8
Figure 83 RF/BB Interface ...................................................................................................................................... 6–9
Figure 84 Keyboard schematics ......................................................................................................................... 6–11
Figure 85 SIM interface block diagram .............................................................................................................. 6–13
Figure 86 BL-5C battery block ............................................................................................................................ 6–13
Figure 87 PWB top side component placement ............................................................................................... 6–14
RM-305; RM-306
System module
Issue 2 COMPANY CONFIDENTIAL Page 6 –3
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