Audio Fault - Nokia RH-30 Series Troubleshooting Instructions

Audio Fault

ICQ: 343183001 QQ: 35070846 Email: Serviceic@yahoo.com.cn
Audio faults
Is earpiece
working ?
Yes
Audio faults
2
Figure 17: Audio troubleshooting (1)
Try to change
No UI- module. Is it working
now ?
No
Change old UI -module back.Set
phone to LOCAL mode. Using
Phoenix Audiotest set EXT IN, HP
OUT, LOOP ON
Measure DC-
offset voltage between earpiece
pads J310/J311 and GND. Is it
~1.38V ?
Yes
Measure
MICB2 voltage from
XMICP (L102 input).
Is it ~2.1V ?
Yes
Earpiece
2
Check earpiece
contact springs from
old UI-module and
Yes
change earpiece and
foam to old UI-
Check L150, C155,
No R151, R152 and line.
If OK change UEM
Check L102, C116,
C150, R153, C159,
No
R172, R158
R158 and line.
If OK change UEM. and line.
If OK change UEM
module.
Retest.