Nokia NPM-6 Series Troubleshooting Instructions page 39

CCS Technical Documentation
Keyboard
faults
2
Is UI-module
No
keymatrix working ?
Yes
Keyboard
faults
3
Issue 1 01/03
Try to change
UI -module. Is it
working now ?
No
Measure ROW0-4
lines from X301.Are
they HIGH ?
Yes
Measure SLEEPX signal
from J403 when key
pressed.
Is it ~1.8V ?
Yes
When keypad is
pressed, the LED's are
turned on ?
Yes
Display
faults
ãNokia Corporation.
Troubleshooting Instructions
Yes
UI connector pad fault in
UI-board or faulty
UI-module.
Retest
Check ROW0-4 lines,
X301. If OK change
No
Z300. If still fails change
UPP.
Check ROW0-4 lines,
X301. If OK change
No
Z300. If still fails change
UPP.
Check ROW0-4 lines,
X301. If OK change
No
Z300. If still fails change
UPP.
Page 39