Nokia 7600 Troubleshooting Manual page 9

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