Nokia NSE-3 SERIES, Service Manual

Page: 92 / 217

PAMS
Technical Documentation
UI Module UE4
Page 4 – 13
Original 11/97
Speaker
The speaker is sealed to A–cover and UI PCB with silicon gasket. With
that the frequency response is more constant. Speaker needs 6pcs of
1.2mm holes under component for leaking sound pressure into RF–sec-
tion through UI module and 7pcs of 0.9mm holes left corner of UIM to
leak from RF–section back to up cavity of phone. RF–section between UI
module and engine acts like sound cage which is known. This gives bet-
ter sound quality for Ultra and Santra phone and it can be estimated in
several environments.
Silicon gasket and speaker itself acts like water proofing elements in that
area. Water can come in speaker space between speaker and A–cover
but not further from there into the phone. On A–cover is 3pcs of leaking
holes which are not located top of the speaker. This holes gives better
sound quality and less sensitive for how well phone is pressed against of
head.