User Guide

NSB-9
Troubleshooting Instructions CCS Technical Documentation
Page 72 Nokia Corporation Issue 1 04/03
Keypad faults
Keypad
faults
Is the power
key working?
Measure voltage
from S336. Is it
high?
Measure
voltage from
S336 when
key is pressed.
Is it high?
Check S336.
Is it OK?
Check R317,
C311, S336 and
line.
If OK change
UEM.
Change S336
Phone
is dead
Keypad
faults 2
Phone
is
jammed
Yes
Yes
Yes
Yes
N
o
N
o
No
N
o