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Nokia Customer Care
Keyboard faults 5
Keyboard
faults
5
Set phone to LOCAL mode. Set
VBATT to 4.2V. Start Display
test with Phoenix. Set
"Keyboard lights" ON
Are keyboard
& display
light (LED)
turned on ?
Yes
End
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Issue 2 05/05
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Try to change
UI -module. Is it
working now ?
No
Check CALLED1
(N300/8 and DLIGHT
(V314/IN).Are
they HIGH ?
Yes
Measure
voltage over C304.
Is it typ. 9.1V ?
Yes
Measure
voltage at X301 pin 15.
Is it
typ. 7.2V ?
Yes
Check X301
Troubleshooting Instructions
Yes
No
No
No
No
NPL-4/5/
UI-board failure.
Retest
Check CALLED1 and
KLIGHT lines. If lines
are OK change
UEMEk
Check
C302,C303,L300,V30
0, R310, R302,R300,
C304.
If OK change N300
Check V313, V314,
R313, R314
Page 79
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Troubleshooting
