Nokia 7600 - USB Fault

NMM-3 Company Confidential
6-Troubleshooting CCS Technical Documentation
Page 6-16 Copyright  2003 Nokia Corporation Issue 1 (11/2003)
Company Confidential
USB Fault
Start
Connect a USB device
to phone and check
N401 Vpu goes to 3.3V.
Check VCC
for ~5V
No
Y
es
Is there any
activity on
D+ and D-?
Y
es
No
Check R423, R424,
R410, R413 and
X410. OK?
Y
es
No
Replace
defective part.
Replace N401.
OK?
End
Check R442, L411,
C414 and X401.
Replace if defective.
No
Y
es
Replace
TIKU
No
Y
es