Nokia 6610 Troubleshooting Instructions page 31

CCS Technical Documentation
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Is the UI-module
keys working?
End
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Try to change UI
PWB. Are the
No
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
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Troubleshooting Instructions
Retest failing
Yes
UI-module
Change X301
No
No
Check lines ROW0 -
ROW4 from X301.
No
If OK, change Z300. If
still fails, change UPP
NHL-4/4U
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