Audio Related Faults 1: Earpiece And Microphone - Nokia RH-18 Troubleshooting Instructions

CCS Technical Documentation

Audio related faults 1: Earpiece and microphone

Figure 9: Top: Earpiece troubleshooting, bottom: Microphone troubleshooting
Issue 1 10/03
Company confidential
Earpiece do not work
Replace :
Earpiece
Error still present
Z150, R161
Check Z150, R161 is
working correctly
(no short/open-circuit)
Yes
Defective D200*
Microphone do not work and
the isn't any mechanical
problem
Z100
Check Z100 is
working correctly
(no short/open-circuit)
Replace :
System Connoctor
Error still present
R165
Check voltage level on
R165 towards UEM (bias)
= 2,1V
Yes
R153
Check voltage level on
R153 towards mic-lines (bias)
= 1,0V - 1,4V
Nokia Corporation.
Check :
No
R386, PWB.
Else defective D200*
Replace :
No
Z100
Check :
No
R165, C168, PWB.
Else defctive D200*
Check :
No
R153, R157,C151, C152,
C153, C154, PWB.
RH-18/36/38
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