Nokia 6020b Service Manual

Issue 1 03/2005

COMPANY CONFIDENTIAL

RM-31
6(a) - Baseband Troubleshooting Instructions

Nokia Customer Care

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Earpiece

2.15 Earpiece

Earpiece

Connect EXT audio signal 1kHz

(sine 300mVpp) to XMICP pad and

Ground on XMICN. Set phone in

LOCAL mode. Use Phoenix Audio

Test. Set Ext microphone in Ext

speaker out, Loop On.

Measure

signal from external

earpiece pads, X2002,

pin 11 - 14. Is there

a sine vawe?

Mesure sine

signal at UEM

(R2154 MIC1_P). Use AC

coupling. Is it close to

300mVpp?

Change UEM

Check R2162, C2170,

C2173, C2174, L2000,

C2012, C2013 and

line.

Change UPP

Retest

Yes

See Waveform 9

Channel 2

See Waveform 10

Channel 2

Waveform 9

Waveform 10