Nokia 7600 - Page 9

CCS Technical Documentation 6-Troubleshooting
Company Confidential NMM-3
Issue 1 (11/2003) Copyright  2003 Nokia Corporation Page 6-9
Company Confidential
Replace the UI-
module. Are keys
workin
g
now?
Are the UI-
module keys
working?
Y
es
No
Y
es
Continue
Retest the faulty
UI-module.
Y
es
No
Check X400 solder
j
oints and spring
contacts. OK?
Replace
X400
No
Measure ROW0 –
ROW5 lines from
X400. Are voltage
levels ~1.8V?
Measure SLEEPX signal
on testpoint J301
when a key is pressed.
Is voltage level ~1.8V?
No
Y
es
When a key is
pressed, do the
LED’s illuminate?
Check ROW0 – ROW5
lines from X400. If OK
replace TIKU.
No
No
End
Illumination
Fault