Nokia RH-6 Series Baseband Description & Troubleshooting page 19

CCS Technical Documentation
IHF speaker acoustics
As mentioned, the so called "MALT" speaker is used in RH-6 for integrated hands-free
and ringing tone applications.
The IHF speaker is mounted to the IHF enclosure by means of the speaker adhesive. The
IHF enclosure provides the needed back volume for the speaker. The IHF enclosure is
closed with the IHF lid, which is carrying the IHF pins to contact the IHF speaker.
The sealing of the effective acoustic volumes is achieved with the enclosure adhesive,
which glues the IHF lid to the IHF enclosure.
To provide a long-term reliability additionally the IHF lid is heat stacked to the IHF enclo-
sure.
The B-cover gasket provides a fitting between the B-cover and the IHF enclosure. This
fitting is attached with an adhesive to the IHF enclosure and also includes a dust and
water shield to protect the speaker inside from dust and swarf.
Due to the fact that the IHF enclosure is also carrying the antenna radiator, the whole
assembly is named antenna assembly.
Due to heat stacking of the antenna assembly, it cannot be disassembled and in case of
failure only be exchanged as one complete assembly.
Issue 1 10/2003
Company Confidential
6 - BB Description & Troubleshooting
Figure 6: Earpiece implementation
© 2003 Nokia Corporation.
RH-6
Page 19