Nokia NHM-4 Series Assembly, Disassembly And Troubleshooting Instructions page 45

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SIM card is out of order (insert SIM card)
SIM card
Insert SIM card
faults
No
*
VSIM
SIMCLK
SIMDATA
SIMRST
First 1.8 V
then 3.0 V
END
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Set phone
Yes
in LOCAL mode
Is it OK ?
Yes
Check X386
Measure VSIM voltge
from X386
Is it 3V ?
Yes
Check SIM
power UP sequency
*
Is it OK ?
Yes
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Check BSI line
X101, C202
No
C104, C240
R260
If OK –>
Change UEM
Check VSIM line,X386,
C203, C389.
No
If OK –> Change R388.
If still wrong VSIM
voltage –> Change UEM
Check SIM lines.
No
If OK –> Change R388.
If still fail –> Change UEM
Change UPP
1+0
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