Chapter 6: Sim Card Faults - Nokia 3510 Repair Manual

Customer Care Europe, Middel East & Africa
SCCE Training Group
 2003 Nokia Mobile Phones

CHAPTER 6: SIM card faults

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.
© NMP 2003
Display message
"Insert SIM card"
Check at
SIM reader pin 1-4
mechanical appearance of SIM reader
ok
if pulsed to
1.8V/3Vpp.
nok
Check SIM lines for
ok
shorts to GND.
nok
Check / change EMI-filter
R386, C203, C381
and C390.
CONFIDENTIAL
NHM-8 / RH-9
Date 10-03-2003
Check SIM card if dirty, check
and SIM cover, change parts if
necessary.
Check / change R386.
If this does not solve the problem
D200/D400 are probably faulty.
Swap phone.
Checked by: SCCE
14 (18)
Repairhints
Version 2.0 Approved
Approved by: Training Group