User Guide

CCS Technical Documentation
Company confidential RH-23
Issue 1 03/2004 Nokia Corporation. Page 53
Audio fault (headset earpiece)
Figure 46: Audio (headset earpiece) failure troubleshooting
Yes
Check C157, R164, C107,
C108, L103, C114, C119,
R105, R106 and lines. OK?
A
udios at headset
earpiece are failing?
(the failure is not in
the headset itself)
Set phone to LOCAL mode. Using Phoenix Audiotest select:
“Ext microphone in Ext speaker out” and set Loop “On”
Yes
Measure XEAR-biasing
voltage from Pop-Port pin
11(HSEARN) and
pin12(HSEARP) to GND.
Are they ~2.0V?
Measure XEAR-biasing
voltage from Pop-Port pin
pin13(HSEARRN) and
pin14(HSEARRP) to GND.
Are they ~2.0V?
Yes
Check C158, R167, C109,
C117, L104, C113, C118,
R107, R108 and lines. OK?
No
No
Connect EXT audio
signal 1kHz (sine,
200mVpp) between
XMICP and XMICN
pads using CA-6UT
cable
Yes
Check signal in C171. ~190mVpp to GND.
(DC Offset ~1.9V).OK?
Check C169, R163, C160, R170, C170, C161, C171. OK?.
Change UEM. OK?
Change UPP
Change IHF
PA (N150)
Retest
Chan
g
e/fix defect
p
art
No
Yes
No
Audio
faults 5
End
No
Figure 20: Audio (headset earpiece) failure troubleshooting
Yes
No
Yes
Chan
g
e/fix defect
No
Yes
No