Flip Faults - Nokia NSB-9 Service Manual

NSB-9
Troubleshooting Instructions

Flip faults

Flip faults
1
Check VBAT
voltage from
V320/pin5. Is it OK?
Yes
Check componenets
R326, R327, R301.
Are they OK?
Yes
Check V320
control voltage
levels (pin 4). Flip
closed -> ~2.75V.
Flip open -> ~0V.
OK?
Yes
Change V320 and
retest
Page 76
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
closed ->
~2.75V. Flip
open -> ~0V.
OK?
Yes
Check line
between
N301/pin3 and
V320/pin5. Is it
OK?
Yes
Change TB9
Retest
module
Nokia Corporation
CCS Technical Documentation
Check
No
No
voltage
N301/pin1 is
it ~2.75V?
Yes
Check R202 and
KEYB1 line.
Are they OK?
No
Yes
Change N301 if Change defect
not still OK part and retest.
change UEM
No
Check R309,
No Change
C309, C205
defect
and VFLASH1
part
line. OK?
Yes
Check
No
Change
VFLASH1
UEM
voltage is it
~2.75V?
Yes
Change
N301
Issue 1 04/03