Nokia NSB-9 Series Troubleshooting Instructions page 74

NSB-9
Troubleshooting Instructions
Keypad
faults 3
No
Are flip
QWERTY
keys
working?
Yes
Keypad
faults 4
Page 74
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 J302
and J308 (Should be
same as engine
VBAT voltage).
Yes
Measure voltage
levels from flip data
(J304) and clock
(J306). Is it ~1.8V
Yes
Check with
oscilloscope that data
is flowing, data shape
and levels are OK.
Yes
Retest
Nokia Corporation
CCS Technical Documentation
No
Change defected part,
either flip or A-cover.
Yes
Retest
No
faults 2
No
Check L310, L312,
R300, R302,
No
genio17/18 lines and
R319 pull-up to VIO
(~1.8V). If ok change
UPP
Issue 1 04/03
Flip
Z300,