Usb Problem - Nokia NHM-1 Series Troubleshooting Instructions

NHM-1
Troubleshooting instructions

USB problem

Start
Connect phone to
PC. Does the
No
USB work ?
Yes
Check X102, R101,
R103, R115, C102,
C103, C104 and
N100 . Are they OK?
End
Page 50
Try to change
DKU-2 cable.
Is the USB
working now?
No
Yes
Measure Vbus (5V)
and Vreg (3.3V). Are
they OK?
Yes
Is SOFTCON
(J119) 1.8V ?
Yes
Is Vpu (J120)
3.3 V ?
Yes
Is D+ high on
X102
Nokia Corporation.
CCS Technical Documentation
Retest failing
Yes
cable
No
repair fault
Change N100
No
Are Vn and
Vp 0V ?
No
Change
N100
No
Check
R103 and
No
X102
Yes
Change N100, if still fails change TIKU
No
Change N100
Yes
Change TIKU
Issue 1 11/03