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Fig. 28.2. below shows the placing of the SIM-pads on the circuit board.
Set SIM VCC high using the button "SIM VCC".
Measure the voltage on J603: 5 +5 V
If the voltage is missing, go to section 28.3.
SIMVCC must be activated when measuring SIMCONRST, SIMCONDAT and SIMCONCLK.
Set SIMCONRST high using the button "SIM Reset" Fig. 28.1.
Measure the voltage on J603: 3 +5 V
If the voltage is missing, go to section 28.3.
Set SIMCONDAT high using the button "SIM Data" Fig. 28.1.
Measure the voltage on J603: 2 +5 V
If the voltage is missing, go to section 28.4.
Set SIMCONCLK high using the button "SIM Clock" Fig. 28.1.
Measure the voltage on J603: 1 +5 V
If the voltage is missing, go to section 28.5.
If all voltages are missing, go to section 28.6.
28.3 SIMVCC is missing
Make sure the DC/DC-transformer N605 gives correct output voltage on pin 3 +5 V
If the output voltage is incorrect, check the input voltage on pin 7 zero V
If the input voltage is incorrect, check the control signal SIMPOW from the processor on D600
pin 72 or V620 pin 1 +3,2 V
If it is missing it can be due to bad soldering at D600 pin 72, D600 or a foil damage.
If it is correct it can be due to any of V620, R685, R686 or C697.
If the input voltage is correct, the fault can be due to N605, C695, C696 or a short circuit at the
output.
4/00021-3/FEA 209 544/18 B
Fig. 28.2
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DC
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DC
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DC
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DC
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DC
Trouble Shooting Guide, Advanced
DC
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DC
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114(121)
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