Nokia NPM-6 Series Troubleshooting Instructions page 41

CCS Technical Documentation
Keyboard
faults
4
Set phone to LOCAL mode. Set
VBATT to 4.2V. Start Display
test with Phoenix. Set
"Keyboard lights" ON
Are keyboard
light (LED)
turned on ?
Yes
End
Issue 1 01/03
Try to change
UI -module. Is it
working now ?
No
Check CALLED1
(N300/8 and KLIGHT
(V314/IN).Are
they HIGH ?
Yes
No
Measure
voltage over C304.
Is it typ. 8.6V ?
Yes
Measure
voltage between
V313/3. Is it
typ. 7.2V ?
Yes
Measure
voltage X301, pin 1.Is it
typ. 7.2V ?
ãNokia Corporation.
Troubleshooting Instructions
Yes
UI-board pads fault or
faulty UI-board.
Retest
Check lines of
CALLED1 and
No
KLIGHT. If lines are
OK change UEM
Check
C302,C303,L300,V30
No
0, R301, R302, R303,
R325, C304.
If OK change N300
Check V313, V314,
No
R313, R314
No Check X301, R307
Page 41