CONFIDENTIAL
14 (18)
Customer Care Europe, Middel East & Africa NHM-8 / RH-9 Repairhints
SCCE Training Group Version 2.0 Approved
2003 Nokia Mobile Phones
Date 10-03-2003
© NMP 2003
Checked by: SCCE
Approved by: Training Group
CHAPTER 6: SIM card faults
Display message
"Insert SIM card"
Check / change R386.
If this does not solve the problem
D200/D400 are probably faulty.
Swap phone.
Check SIM lines for
shorts to GND.
Check / change EMI-filter
R386, C203, C381
and C390.
Check at
SIM reader pin 1-4
if pulsed to
1.8V/3Vpp.
Check SIM card if dirty, check
mechanical appearance of SIM reader
and SIM cover, change parts if
necessary.
ok
nok
nok
ok
X387
- If “Insert SIM card” appears on LCD, first of all check mechanical appearance of SIM card reader X387.
- You have to change SIM reader if contact springs are bent, soiled or corroded.
R386/D200/D400
- If fault persists and mechanical appearance of SIM reader seems to be ok, check with oscilloscope if SIM lines at
SIM reader pins 1-4 are pulses to 1.8V / 3V as shown in the chart below (Phone switched on without SIM card).
Signals are slightly different between pins 1-4 but the amplitude always is 1.8V / 3V.
Figure 7: VSIM
In case that the above mentioned signal is not measurable at one or more SIM lines, check SIM lines for shorts to ground.
Resistance of SIM data- and VSIM line normally is > 200kOhm, resistance of SIM reset- and SIM clock line normally is
about 4.5MOhm.
If resistance of any line is not ok check parts the SIM lines consists of (R386, C203, C381, C390).
In case resistance of all lines is ok but fault persists, EMI-filter R386 may have internal interruption.
Change part and retest the phone. It also is possible that UEM D200 or UPP D400 are responsible for this fault.
Swap the phone because these components are underfilled and not changeable.
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