User Guide

NSB-9
Troubleshooting Instructions CCS Technical Documentation
Page 76 Nokia Corporation Issue 1 04/03
Flip faults
Flip faults
1
Check VBAT
voltage from
V320/pin5. Is it OK?
Check V320
control voltage
levels (pin 4). Flip
closed -> ~2.75V.
Flip open -> ~0V.
OK?
Check componenets
R326, R327, R301.
Are they OK?
Yes
N
o
Change V320 and
retest
Yes
N
o
N
o
Yes
Check VBAT line, C201, C202.
If not OK, change defect part
and retest
Check voltage
N301/pin3. Flip
closed ->
~2.75V. Flip
open -> ~0V.
OK?
Change defect
part and retest
Yes
Check line
between
N301/pin3 and
V320/pin5. Is it
OK?
N
o
Change TB9
module
Yes
Retest
N
o
Check
voltage
N301/pin1 is
it ~2.75V?
Yes
Check R202 and
KEYB1 line.
Are they OK?
Check R309,
C309, C205
and VFLASH1
line.
OK?
Change
defect
part
Change
N301
Change N301 if
not still OK
change UEM
Change defect
part and retest.
Yes
N
o
N
o
Yes
N
o
Check
VFLASH1
voltage is it
~2.75V?
Yes
Change
UEM
N
o