Nokia 6020b Service Manual

Nokia

Issue 1 03/2005

COMPANY CONFIDENTIAL

9

Copyright © 2005 Nokia. All Rights Reserved.

RM-31
6(a) - Baseband Troubleshooting Instructions

Nokia Customer Care

■

Phone is dead 2

Is

PURX=1.8VDC

on J2800 1sec. after

power key

is pressed?

Dead2

Is Sleep CLK on

J2802 = 32.8kHz,

1.8Vpp?

Is VR3=2.78VDC

seen at C2234?

Is there a

26MHz clock

(typ) 850mVpp

at R2902?

Yes

Check: B2200,
C2241, C2210,

PWB then

replace D2200

Replace

D2200, PWB

Yes

Check C2234

then replace
D2200, PWB

Check R2902,

C2902

Yes

No

No

No

No

Retest

See Waveform 1

See Waveform 2

Phone is

Jammed

Yes

Waveform 1

Waveform 2