User Guide

Introduction to baseband troubleshooting
For service
There are only two changeable parts on the PWB:
• Battery connector (X100)
• SIM connector (X386), troubleshoot: SIM card failure (Page 6–12)
Note: Most components are under shielding and therefore not changeable. You MUST NOT cut the
shielding cans open!
For analysis
This document describes in overview the different hardware error possibilities for the phone. Not every possible
hardware error is described, only those possible to correct.
Note: Most components and test points are not accessible unless shielding cans are cut open. This
must ONLY be done by the Return analysis technicians and for analysis only!
Display information: "Contact service"
When this error appears in the display it means that one or more of the internal baseband tests has failed. The
baseband tests (self tests) are performed each time the phone is powered on. The self tests are divided into
those performed while powering up (Start up tests) and the ones that can be executed with a PC using Phoenix
(Runtime tests). The following Start-up tests are performed during power up:
UEM CBUS IF TEST
SLEEP X LOOP TEST
AUX DA LOOP TEST
EAR DATA LOOP TEST
TX IDP LOOP TEST
TX IQ DP LOOP TEST
SIM CLK LOOP TEST
SIM IO CTRL LOOP TEST
MBUS RX TX LOOP TEST
BACKUP BATT TEST
RADIO TEST
WARRANTY TEST
PA TEMP TEST
SIM LOCK TEST
PPM VALIDITY TEST
KEYBOARD STUCK TEST
LPRF IF TEST
FLASH CHECKSUM TEST
CAMERA IF TEST
EXT RAM DATA BUS TEST
EXT RAM ADDR BUS TEST
NAND FLASH ID TEST
BT WAKEUP TEST
RM-13/33
Baseband Troubleshooting and Tuning Nokia Customer Care
9240218 (Issue 1) Company Confidential Page 6–5
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