User Guide

RH-23 Company confidential

CCS Technical Documentation

Page 48 Nokia Corporation. Issue 1 03/2004

Audio faults

Figure 41: Audio (earpiece) failure teoublehooting

Audio

faults

Check earpiece contact springs

from failing Upper Block . Check

also X1100, L1100, C1100,

R1111, R1110 and lines.

Change failing part. Retest.

Yes

Set phone to LOCAL mode. Using

Phoenix Audiotest select:

“Ext microphone in Hp speaker

out”

and set Loop “On”

Check X302, L150,

C155, R151, R152 and

line. If OK, change UEM.

Yes

Check L102, C116,

C150, R153, C159,

R158, R172 and line.

If OK change UEM

Earpiece

Yes

Audio

faults 2

Figure 15: Audio (earpiece) failure troubleshooting

Can you hear proper

audio from earpiece? (no

distortion)

Yes

Test lower block in

module jig with

functional upper block.

OK?

Measure DC- offset voltage

between earpiece lines and

GND. Is it ~1.38V?

Failure in upper block or

Hinge flex

Failure in lower block

Measure MICB2 voltage from