Nokia RH-30 Series Troubleshooting Instructions page 44

ICQ: 343183001 QQ: 35070846 Email: Serviceic@yahoo.com.cn
Continue
Is the UI-module
No
keys working?
Yes
End
Figure 9: Keypad troubleshooting (2)
Try to change UI
PWB. Are the
keys working
now?
No
Check X301 (solder
joints and spring
contacts). Is it OK?
Yes
Measure ROW0 - Row4
lines from X301. Are
voltage level ~1.8V?
Yes
Measure
SLEEPX-signal from
testpoint J403 when
key is pressed.
Is voltage level
~1.8V?
Yes
When keypad is
pressed, are the
LED's turned on?
No
Illumination
fault
Retest failing
Yes
UI-module
Change X301
No
No
No
If OK, change Z300. If
still fails, change UPP
Check lines ROW0 -
ROW4 from X301.