User Guide

RH-48
Troubleshooting — BB CCS Technical Documentation
Page 48 © 2003 Nokia Corporation Confidential Issue 1 11/2003
Keypad
faults,
page 2
Are the UI modules
keys working?
Change keypads
module. Is it
working?
Measure ROW0-5
(P10-P15) signals
between UPP and
keypad at J325,
J320, J321, J322,
J323. Are they
~1.8V?
Measure COL 1-5
(P1-P5) signals
between UPP and
keypad at J331,
J324, J337, J326,
J327, J328, J329. Are
they ~1.8V
Retest
Make sure
there are no
shorts on
Z300. If OK,
change UPP
Make sure
there are no
shorts on
Z300. If OK,
change UPP
END
NO
YES
NO
NO
YES
NO
YES