User Guide

CCS Technical Documentation Troubleshooting Instructions
NSB-9
Issue 1 04/03 Nokia Corporation Page 77
Flip faults
2
Check VBAT
voltage from
V319/pin5. Is it OK?
Check V319
control voltage
levels (pin 4). Flip
closed -> ~0V.
Flip open ->
~2.75V. OK?
Check componenets
R321, R323, R328,
L311, L313 and
lines. Are they OK?
Yes
N
o
Change V319 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
UEM KEYB1
line. Is it OK?
N
o
Change TB9
module
Yes
Retest
N
o
Check
voltage
N301/pin1 is
it ~2.75V?
Yes
Check R202 and
UEM 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