Ui Modules - Nokia 6255 Description And Troubleshooting

6255/6255i6256/6256i (RM-19)
Baseband Description and Troubleshooting

UI Modules

Keypad
faults,
page 2
Are UI modules
keys working?
YES
END
Page 64
Change keypads
NO
module. Is it
working?
Measure ROW0-4
Keyb(5) and
Keyb(9) signals
between UPP and
Z2400. Are they
~1.8V?
Make sure there
are no shorts on
Z2400. Is it OK?
Change Z2400
©2005 Nokia Corporation
YES
NO
YES
NO
YES
NO
Company Confidential
Nokia Customer Care
Retest
Retest
Change the UPP.
Issue 2 05/2005