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7.4
TX frequency fault
Measure the feed voltage to N392 when the transmitter is on. Also check BSEL on N392: 5.
If the voltages are correct, make a calibration of the phone.
If the calibration fail the fault is probably due to components that can not be replaced.
7.5
The switched output power is correct, but can not connect a
call
Check the modulation signals (MODQN, MODQP, MODIN and MODIP) from D600 at both
sides of the resistors, R512, R513, R514 and
Compare the signals with a reference-board.
If the signal is different, replace the resistor and the capacitor (C520 or C522).
If all signals are correct, the fault is due to D600, N500 or N300.
4/00021-3/FEA 209 544/25 C
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Ericsson Mobile Communications AB
Trouble Shooting Guide, Advanced
R515.
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