User Guide

TROUBLESHOOTING

9526ARo

6–2–3

NHC–4

Technical Documentation

Troubleshooting for Base Band

Overview to base band troubleshooting

The purpose is to define fault block of the module and then find out the defect

component.

Baseband oriented failures are usually found out in the flash station of the pro-

duction line.In the first phase,before programming the flash,the phone is started

to minimum mode and current consumption is measured.If current consumption

is in acceptable limits and MBUS registration is OK,flash is programmed.After

flash programming phone is started to local mode and tester starts to send

MBUS messages to activate MCU self tests.During the MCU self tests all the

major components of the baseband are tested.Every test returns number of the

test and result ( OK / failed ).All information of the test is stored to phone ori-

ented test file,witch is available on the troubleshooting station.MCU self tests

can be restarted on trobleshooting station with SERVICE PCLOCALS.

If phone can be flashed and all/some self tests performed,the baseband is

mainly OK.By refering the test file of the phone,defect component or connec-

tions between components can located.

In case of current consumption/MBUS registration failure,the phone must be

taken to more specific measurements of voltages,clocking signals and states of

reset signals.