User Guide

RH-20 Company confidential
CCS Technical Documentation
Page 52 Nokia Corporation. Issue 1 10/2003
Figure 17: Audio troubleshooting (4)
Audio faults
3
IHF speaker
working ?
Try to change new C-
cover assembly. Is it
working now?
Restore old C-cover.
Set phone to local mode with Phoenix.
Set buzzer ON, vol "9" and freq. to 1kHz.
Measure DC-
level between IHF
pads J156/J157 to
GND. Is it ~1.8V ?
Measure AC-
level between IHF
pads (J156,J157).
Is it ~1.0Vrms ?
IHF speaker or
contact springs
fault.
Retest.
Check signal in C161.
Is it OK ?
Check IHF PA
controls on J152,
J153, J154.
Is it OK ?
No
Yes
No
Speaker
contact springs
faults.
Retest.
Change UPP
Change IHF
PA (N150)
Yes
No
Yes
Check C161,
C160, R163,
C169, C170,
R170, C171.
If OK then
change UEM
No
Check C160,
C161, C169,
C166, R163,
L151, L152, C164
and IHF PA output
lines.
Retest.
Yes
No
END
Yes
Yes
Yes
No