CCS Technical Documentation
Troubleshooting Instructions
NSB-9
Issue 1 04/03
Nokia Corporation
Page 75
Are engine
QWERTY
keys
working?
Keypad
faults 4
Keypad
faults 5
Is it a S306 that is
not working (SHIFT
key)
Yes
No
Yes
Check switch S306,
R316, Genio 19 line
and VIO voltage at
R316 ~1.8V. OK?
Yes
No
No
No
Yes
Yes
No
Change
UPP
Change
defect part
Measure voltage of
keypad ROW
where faulty key is
located. Is it ~1.8V
Check keypad
COLUMN where faulty
key is located. Is there
a pulse sequency
every 50ms when
faulty key is pressed
down
Change
UPP
Check switch and lines of
faulty key. In case of column
4 or 5 check also R330,
R331, R315. If OK change
Z301. If still not OK change
UPP.
Check keypad
switch and lines,
R330, R331, R315.
Are they OK?
Change
defect part
Check switch and lines of
faulty key. If OK change
Z301. If still not OK
change UPP.
No
Yes