User Guide

RH-26
7 - Troubleshooting Instructions CCS Technical Documentation
Page 28 ©Nokia Corporation Issue 1 02/04
Faults by symptom
SIM card
The whole SIM interface locates in two chips: UPP and UEM. The SIM card is connected
to UEM through EMI/ESD filter R388. The SIM card detection signal is taken from the BSI
line. If the “Insert SIM card” text or other SIM related message appears on the display,
check the following:
• BSI contact is reliable. Very short break can cause “Insert SIM card” message.Typ-
ical DC-level is 1.19V with BL-5C.
• SIM connector contacts and solderings. SIM card holder.
VSIM,SIM CLK,SIM RST and SIM DATA signals are according to the figure below after the
power switched on. If signals are OK only at test points, change R388. Note that SIM
connector contacts are on the opposite side of the connector pads
Figure 6: SIM test points.