CCS Technical Documentation
Company confidential RH-18/36/38
Issue 1 10/03 Nokia Corporation. Page 11
SIM related faults
Insert SIM card fault
The hardware of the SIM interface from UEM (D200) to the SIM connector (X387) can be
tested without a SIM card. When the power is switched on the phone first check for a
1,8V SIM card and then a 3V SIM card. The phone will try this four times, whereafter it
will display ”Insert SIM card”.
Figure 6: SIM troubleshooting
Figure 7: Signal diagram
Check for SIM voltage during power-up
Ch1 : VSIM
Ch2 : RESET
Ch3 : CLOCK
Ch4 : DATA
Display shows :
"Insert SIM Card"
Check :
X387, R386, PWB.
Else defective D200*
X387
Verify that phone checks for
1,8V-SIM, and then 3V-SIM
during power-up.
(See illustration below)
Yes
No
Yes
SIM Interface OK
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