Nokia 8850 Manual Do Serviço
NSM–2
Disassembly & Troubleshooting Instructions
Disassembly & Troubleshooting Instructions
PAMS Technical Documentation
Page 18
Issue 1 12/1999
Nokia Mobile Phones Ltd.
SIM related faults
The hardware of the SIM interface from MAD2 (D200) to the SIM con-
nector (X302) can be tested without a SIM card. When the power is
switched on and the BSI line is grounded by a resistor, all the used lines
(VSIM, RST, CLK, DATA) rise up to 5 V four times. Thus “Insert SIM card”
faults can be found without SIM card.
nector (X302) can be tested without a SIM card. When the power is
switched on and the BSI line is grounded by a resistor, all the used lines
(VSIM, RST, CLK, DATA) rise up to 5 V four times. Thus “Insert SIM card”
faults can be found without SIM card.
The fault information “Card rejected” indicates that ATR message (the first
message is always sent from card to the phone) is sent from card but the
message is somehow corrupted, data signal levels are wrong etc. or fac-
tory set values (stored to the emulated EEPROM) are not correct.
message is always sent from card to the phone) is sent from card but the
message is somehow corrupted, data signal levels are wrong etc. or fac-
tory set values (stored to the emulated EEPROM) are not correct.
IF NOT OK
IF NOT OK
Check the Vsim. Is it 3V or 5V
Vsim (C128 bottom connector side
head )
Vsim (C128 bottom connector side
head )
Check the Vsrm (C131 RF side head)
V5V (C108 bottom connector side
head)
V5V (C108 bottom connector side
head)
Check the regulator N600, V116, C132
and C131
and C131
Check the V104. R128, R125, R124
and C128
and C128
OK
Change the CCONT N100
OK
OK