User Guide

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