Nokia NSB-9 Series Troubleshooting Instructions page 73

CCS Technical Documentation
Keypad
faults 2
No
Are flip T9
keys
working?
Yes
Keypad
faults 3
Issue 1 04/03
Check flip poco pins,
engine contact pads.
and spring contacts
between A-cover and
engine module. Are
they OK?
Yes
Change flip. Is it OK
now?
No
Measure Flip VBAT
voltage between J301
and J307 (Should be
same as engine
VBAT voltage).
Yes
Measure voltage
levels from flip data
(J303) and clock
(J305). Is it ~1.8V
Yes
Check with
oscilloscope that data
is flowing, data shape
and levels are OK.
Yes
Retest
Nokia Corporation
Troubleshooting Instructions
No Change defected part,
either flip or A-cover.
Yes
Retest
Flip
No
faults 1
No
Check R300, R302,
Z300, genio17/18 lines
No
and R319 pull-up to VIO
(~1.8V). If ok change
UPP
NSB-9
Page 73