Earpiece/Loudspeaker; Mechanical; Electrical - Siemens S55 Repair Documentation

8.3 Earpiece/Loudspeaker

8.3.1

Mechanical

The speakermodule is designed to provide optimal performance for mobile handsfree
and sound ringer. Plus independent from mobile leakage sound performance.
Therefore speakermodule is a system that has a closed front volume with sound-
outlets towards the ear of the user. Backvolume of Speakermodule is using the
unused air between the antenna and the PCB. Backvolume is just used for resonance,
there is no sound output from backvolume. The speakermodule is glued to the
lightguide and contacted via two bending springs to the PCB. The lightguide itself is
screwed with six screws via the PCB to the mounting frame lower part. Two of the six
screws are located besides of the connection of speakermodule and lightguide.
Therefore a good and reliable connection between speakermodule and PCB should
be provided.
8.3.2

Electrical

The internal and external Loudspeaker (Earpiece) is connected to the voiceband part
of the EGOLD+ (
Analog Interface B1, C1
EPN1_FIL - EPP1_FIL.
internal Loudspeaker
loudspeaker too. To activate the ringer, the signal
( ) is used
Miscellaneous,D16
EGOLD+
V1.00
S55/S57
) via audio amplifier inside the ASIC (D361). Input
Output for external loudspeaker
EPP! – EPN1. The ringing tones are generated with the
to ASIC
from Bright
IC
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AUDIO_L - AUDIO_R,
RINGIN from the EGOLD+
ICM MP CCQ GRM
for
12/02