No Audio; Key Pads Malfunction; No Lcd Display - Nokia 2255 Baseband Description And Troubleshooting

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2255 (RM-97)

Baseband Description and Troubleshooting

• Check for incorrect SleepX signal levels

• Check if ESN number is corrupted

No Audio

• Check for bad contacts or damaged ear piece

• Check for bad connections at mic

• Check for broken or bad solder joint of passive components

• Verify the audio signal paths using BaseBand "audio test" component with

Phoenix as described in the troubleshooting guide

• Check for protective film left on back of the key dome if a new one was installed

• Check for corrosion on both the key pads and key dome

• Check if flash software was corrupted

• Check for bad joint from UPP to Interface

• Check for pins shorted on or bad on ESD ASIP Z2400

• Check for bad connections

• Check for a cracked or damaged display

• Probe test points as described in the troubleshooting guide for missing for

incorrect signal level

Page 34

Company Confidential

ISSUE 1 10/2005

Table of Contents

Rm-97