Trouble Shooting Guide, Advanced
4/00021-3/FEA 209 544/25 C
Ericsson Mobile Communications AB
9(78)
Measure the voltages VDIG and VCORE.DSP.
If the voltages are correct, check the 13 MHz clock (B320) and MCLK (N300, pin 52 or at
L340 at the side close to N300) with an oscilloscope, the value of the measurements should be
500 mV p-p.
If not, change B320, if the fault still remains, it is probably due to N700.
Also check D602 (pin 5 and 6) they should be, 2.75 ± 0.10 V
DC
If not, check the soldering and resold if necessary.
If the fault still remains, it is probably due to N700.
Check VBOOST 4.1 ± 0.10 V
DC
and VRAD, 3.8 ± 0.20 V
DC
..
If the measured values are incorrect use the circuit diagram.
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