User Guide

6255/6255i6256/6256i (RM-19)
Baseband Description and Troubleshooting Nokia Customer Care
Page 68 ©2005 Nokia Corporation Company Confidential Issue 2 05/2005
USB faults
page 2
Attach DKU-2 cable
between PC and
phone
Check for ~5V on
C1022
Check for ~2.8V on
pin 6 of system
connector
YES
NO
YES
NO
YES
USB host not
supplying VBUS,
check connection to
PC
Check for ~2.8V on
R11287
Check for ~5V on
Z101
Replace R1190
Replace NUT and
check for ~2.8V on
R1187
NONO
Yes
USB faults
page 3
YES
Replace USB ASIP
YES
Replace D2800
NO
Retest