Nokia NPM-6 Series Troubleshooting Instructions page 32

Troubleshooting Instructions
Display faults
Set phone to LOCAL mode. Set
VBATT to 4.2V. Start Display
test with Phoenix. Set display
ON
Are display light
(LED) turned on ?
Yes
Display faults
2
Page 32
Try to change
UI -module. Is it
working now ?
No
Check CALLED1
(N300/8 and DLIGHT
(V312/IN).Are
they HIGH ?
Yes
No
Measure
voltage over C304.
Is it typ. 8.6V ?
Yes
Measure
voltage between J303
and J302 .Is it
typ. 7.2V ?
Yes
Measure
voltage between X302,
pin 9. Is it
typ. 7.2V ?
ãNokia Corporation.
CCS Technical Documentation
Board to boad
Yes
connector fault in
displaymodule or
faulty module.
Retest
Check lines of
CALLED1 and
No
DLIGHT. If lines are
OK change UEM
Check
C302,C303,L300,V30
No
0, R301, R302, R303,
R325, C304.
If OK change N300
Check V311, V312,
No R311, R312.
Retest
Change X302.
No
Retest
Issue 1 01/03