Nokia NEM-4 Series Troubleshooting Instructions page 32

NEM-4
BB Troubleshooting
"Insert SIM Card" in device display although card is inserted
START
Perform
No
Replace UEM
SIM BB self tests.
Are they OK?
Yes
Perform
No
Phoenix SIM tests.
Are they OK?
Yes
Check & clean battery
No
Is the SIM
centre contact. Verify BSI
Detection Reliable?
signal has a steady voltage.
Yes
Analyse signals & look for
No
errors in rise / fall times due
Problem solved?
to wrong fitted / faulty
Yes
END
Page 6(a)-30
Company Confidential
Perform
BB SIM self tests.
Are they OK?
Yes
Check SIM connector
Is it OK?
Yes
Measure VSIM.
Is it 1.8/3.0V when SIM
interface is powered
up?
Yes
Check SIM Power Up
sequencing. Is it OK?
Yes
passives
Copyright  2003 Nokia Corporation
Company Confidential
CCS Technical Documentation
No
Replace UPP_WD2
Check & clean connector
No
contacts & pads
Replace connector
No Measure VSIM
No
resistance to GND.
Is it low?
Yes
Check C471/C488. No
Check C471. Is it OK?
Are they ok?
Yes
Change SIM ASIP, R496
Check Clk, RST &
No
No
DATA at SIM connector.
Are the signals
present?
Yes
Change UEM
Change VSIM and
Change VSIM
decouple C471/C488.
decouple,C471
Check Clk,
RST & DATA between
No
UEM and the SIM ASIP.
Are the signals
present?
Yes
Change SIM ASIP, R496
Issue 1 09/2003
Change UEM