Key Or 5-Way Switch Not Working - Nokia NHL-2NA Series Troubleshooting Instructions

NHL-2NA

Key or 5-way switch not working

UI module includes 5-way switch, application key, voice recorder key and two softkeys.
Key problem
Check keymat,
switch and
domes visually.
Check connectors,
both male and
female. Are they
Check in MJS-9Q that key
lines are scanned in boot
up (pins 11-16 and 19-22)
Check EMI
filters visually.
Are they OK?
Change UPP
WD2 and test
Change UI
module and
test if OK.
Beyond
economical repair
Page 4
NOK
OK
No
OK?
Yes
Yes
No
Change EMI filter
No
Yes
Yes Problem solved
if OK.
No
Yes Problem solved
No
¤Nokia Corporation
CCS Technical Documentation
Change keymat,
switch or module
and retest.
Repair connectors
and retest.
Change 5 way
switch or module
and retest
and retest.
Issue 1 07/02