Nokia RH-30 Series Troubleshooting Instructions page 55

ICQ: 343183001 QQ: 35070846 Email: Serviceic@yahoo.com.cn
Audio faults
3
IHF speaker
No
working ?
Yes
Set phone to local mode with Phoenix.
END
Set buzzer ON, vol "9" and freq. to 1kHz.
No
Check C160,
C161, C169,
C166, R163,
L151, L152, C164
C173,C174 and
and IHF PA output
Yes
IHF PA output
lines.
Retest.
lines.
Retest.
Figure 20: Audio troubleshooting (4)
Try to change new C-
cover assembly. Is it
working now?
No
Restore old C-cover.
Measure DC-
level between IHF
pads J156/J157 to
GND. Is it ~1.8V ?
IHF speaker or
contact springs
Yes
fault.
Retest.
Yes
Measure AC-
level between IHF
pads (J156,J157).
Is it ~1.0Vrms ?
No
Check signal in C161.
Is it OK ?
Yes
Check IHF PA
controls on J152,
Yes
J153, J154.
Is it OK ?
No
Change UPP
Speaker
contact springs
Yes
faults.
Retest.
Check C161,
C160, R163,
C169, C170,
No
R170, C171.
If OK then
change UEM
Change IHF
PA (N150)