User Guide

RM-11
Troubleshooting - Baseband CC Technical Documentation
Page 56 ©2004 Nokia Corporation Confidential Issue 1 02/2004
UI Modules
Keypad
faults,
page 2
Are UI modules keys
working?
Change keypads
module. Is it
working?
Measure ROW0-4
(P10-P15) signals
between UPP and
X301. Are they
~1.8V?
Measure COL1-4
(P01-P04) signals
between UPP and
X302. Are they
~1.8V?
NO
Retest
YES
Make sure there are
no shorts on Z300. If
OK, change UPP
Change Z300
Make sure there are
no shorts on Z300. If
OK, change UPP
NO
YES
NO
NO
YES
END
YES