Energy Management - Nokia RM-392 Service Manual

RM-392; RM-393
System Module

Energy management

Filter components
The master of EM control is Liteplus and with SW it has the main control of the system voltages and operating
modes. The power distribution diagram is presented in the illustration below.
Figure 107 Power connection diagram
All connectors going to the "outside world" have filter components, ESD protection and EMC reduction.
The Digital/Data lines on SIM have special dedicated filter ASIP. The below figure show the SIM filtering.
Figure 108 SIM filtering
The Audio circuit: Earpiece, IHF, internal microphone and external speaker are filtered with discrete
components (common mode reduction coils, Varistors, caps and resistors), where as the external microphone
uses differential mode mic. ASIP
Issue 1 COMPANY CONFIDENTIAL Page 6 –7
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