User Guide

RH-17
Troubleshooting — BB CCS Technical Documentation
Page 48 Nokia Corporation Confidential Issue 1 04/2003
Keypad
faults 2
Are the UI modules
keys working?
Yes
No
Change Keypads
module.
Is it working?
Yes
No
Retest
Measure ROW0-4
(P10-P14) signals
between UPP and
X302.
Are they ~1.8V?
No
Yes
No
Change Z300.
Make sure there are
no shorts on Z300.
If OK change UPP.
Measure COL1-4
(P1-P4) signals
between UPP and
X302.
Are they ~1.8V?
Yes
Make sure there are
no shorts on Z300.
If OK change UPP.
END