User Guide

CCS Technical Documentation
Company confidential RH-23
Issue 1 03/2004 Nokia Corporation. Page 51
Audio fault (IHF)
Figure 44: Audio (IHF) troubleshooting
Audio
faults 3
No Yes
Yes
Check C169, R163, C160,
R170, C170, C161, C171.
If OK, chan
g
e UEM.
Check X302, L151, L152, C164, C172
and IHF PA (N150) output lines. OK?
Yes
End
Yes
No
No
Yes
Chan
g
e IHF PA
(
N150
)
Yes
Change UPP
No
Figure 18: Audio (IHF) failure troubleshooting
Is IHF-speaker working?
Test lower block in
module jig with functional
upper block. OK?
Failure in upper
block or Hinge flex
Failure in
lower block
Test failing upper
block in module
Jig. OK?
Check IHF
contact springs,
L1111, L1112,
R1112, R1113,
C1111 and
X1100. OK?
Check IHF
speaker and
hinge flex
No
Change/fix
defect part
No
Set phone to LOCAL mode
in jig. Set buzzer ON, vol
“9” and freq. to 1kHz.
No
Measure DC-level from module jigs “hinge”
XEARP(pin9) to GND and XEARN(pin10) to
GND. Is it ~2.0V?.
No
Measure AC-level between jigs “hinge”
XEARP(pin9) and XEARN(pin10). Is it ~2.8V?.
(1.4Vpp measured to GND. DC_offset ~2.0V)
Check signal in C169. ~900mVpp to
GND.
(
DC Offset ~2.0V
)
. OK?
Check IHF PA controls on J152,
J153, J154. OK?
Change/fix defect
part and retest
No
YesYes