User Guide

CCS Technical Documentation
Company confidential RH-23
Issue 1 03/2004 Nokia Corporation. Page 57
Keypad Illumination Fault
Figure 50: Keypad illumination troubleshooting
Start
Do the keypad
lights switch on?
End
Yes
Change/fix defect
com
p
onent
(
s
)
Check UI-board
position and
connector X301.
OK?
No
Activate lights
with Phoenix and
measure J307=0V
Y
es
Measure X301
pins 14 to 17.
Are they ~3.5V?
No
Change UEM (D200)
No
Yes
Y
es
Check C300,
C301, R300,
C302 and C303.
O
K?
Change/fix
defect
component(s)
Change D300
Do the keypad
lights switch off?
Yes
No
No
No
Yes
Figure 23: Ke
y
pad illumination troubleshooting