Internal Speakers; Vibra Circuitry - Nokia RM-484 Service Manual

RM-484; RM-485; RM-486
System Module and User Interface
Figure 78 Internal earpiece circuitry

Internal speakers

Internal speakers are used for Internal HandsFree (IHF) call mode, video call, ringing tones, FM radio and
music listening.
Two dynamic 8x12mm speakers are connected to Avilma ASIC's outputs XearR/XearL via stereo D-class IHF
amplifier TPA2012D2. The amplifier has 12 dB fixed gain and it is put to shutdown mode when not in use.
Figure 79 Internal speakers

Vibra circuitry

Vibra is used for the vibra alarm function.
The vibra motor is connected to the Avilma ASIC VibraP and VibraN Pulse Width Modulated (PWM) outputs.
Figure 80 Vibra circuitry
Issue 1 COMPANY CONFIDENTIAL Page 8 –27
Copyright © 2009 Nokia. All rights reserved.