Nokia NSB-9 Service Manual page 251

CCS Technical Documentation
Flip faults
2
Check VBAT
voltage from
V319/pin5. Is it OK?
Yes
Check componenets
R321, R323, R328,
L311, L313 and
lines. Are they OK?
Yes
Check V319
control voltage
levels (pin 4). Flip
closed -> ~0V.
Flip open ->
~2.75V. OK?
Yes
Change V319 and
retest
Issue 1 04/03
No
Check VBAT line, C201, C202.
If not OK, change defect part
and retest
No
Change defect
part and retest
Check voltage
N301/pin3. Flip
No No
closed ->
~2.75V. Flip
open -> ~0V.
OK?
Yes
Check line
between
N301/pin3 and
UEM KEYB1 No
line. Is it OK?
Yes
Change TB9
Retest
module
Nokia Corporation
Troubleshooting Instructions
Check
No
voltage
N301/pin1 is
and VFLASH1
it ~2.75V?
Yes
Check R202 and
UEM KEYB1
line. Are they
No
OK?
Yes
Change N301 if
Change defect
not still OK part and retest.
change UEM
NSB-9
No
Check R309,
Change
C309, C205
defect
part
line. OK?
Yes
Check
No
Change
VFLASH1
UEM
voltage is it
~2.75V?
Yes
Change
N301
Page 77