Baseband Troubleshooting Instructions
CCS Technical Documentation
Page 54
¤
Nokia Corporation
Issue 1 10/02
Figure 55: Keypad Faults
Keypad
faults
Is the power key (S300)
working?
Measure voltage
from S300.
Is it high?
No
Check R301,
C312, S300,
and line.
If OK ->
change UEM.
No
Measure
voltage from S300
when it is pressed.
Is it high?
Yes
Check S300.
Is it OK?
Yes
Change S300
No
Phone is
dead
Yes
Phone is
jammed
No
Keypad
faults 2
Yes