User Guide

RH-26
7 - Troubleshooting Instructions CCS Technical Documentation
Page 38 ©Nokia Corporation Issue 1 02/04
Symptoms
No voice from earpiece or bad quality.
• Earpiece is integrated into LCD module and the whole module must be changed
in fault situation. If change does not help, check L150 under RF-shield assembly
and R160 under the UEMK shielding.
No voice from microphone or bad quality.
• Microphone is in B-cover assembly and it is a replaceable part. Needed bias for
microphone is 2.1V, which is fed from AUDIO(4) MICB1 line through R165. Series
components are C153 and R157.
No voice from IHF speaker or bad quality.
• Check IHF amplifier N150 output series components L151 and L152. IHF speaker
is integrated into antenna and the whole antenna module must be changed in
fault situation. If change does not help, failure is under the UEMK shielding.
Input lines for the IHF amplifier are XAUDIO(7), XAUDIO(1) HF and XAUDIO(2)
HFCM. XAUDIO(7) series components are C170 and R169. HF and HFCM signals
are fed through C158, C166 and R164. Control line for the IHF amplifier is
GENIO(13), which is 1.8V when the amplifier is on.
External audios does not work.
• Refer to the previous section Pop-Port
TM
system connector. EXTMIC series com-
ponents are C154 and R155. The required bias for the external microphone is
2.1V, which is fed from XAUDIO(3) MICB2 line through R156 and R153. XEAR
series component is R162. HOOKINT information goes through R166 to the UEMK
and HEADINT through R102.