Ericsson A2618s Troubleshooting Manual page 6

Trouble Shooting Guide, Standard
If the VVCO-voltage is incorrect, measure the voltage at L700 3.7 ± 0.5 V
measure on the
DC,
pin close to R705.
If the voltage on L700 is incorrect, on the pin close to R705, measure the resistance of L700
(0 Ohm).
If the resistance is correct, send the unit on according to the local company directives.
If the resistance is too high, replace L700.
If the voltage on pin 1 of N701 is incorrect, measure the resistance of R861 (0.0 ohm) and
R704 (0.0 ohm).
If the resistance is correct, send the unit on according to the local company directives.
If it is incorrect, replace the faulty resistor.
If the voltage on V705 is 3.7 V , on the pin close to R705, replace V705.
DC
Otherwise send the unit on according to the local company directives.
2.3 Check the feed voltages
Measure the VHOM-voltage on N300: 5, measure at C200 and N300: 13, measure at C200.
If the VHOM-voltage is incorrect, measure the resistance of Z702 (0,15 ohm).
If the resistance is incorrect, replace Z702.
Also measure the resistance of C200, C201 (>15 kohms).
If the resistance is lower replace the faulty component.
Measure the VVCO-voltage on N300: 22, 24,33,46, 47, 57, 62.
If the VVCO-voltage is incorrect, measure the resistance of Z701 and Z300 (0,15 ohm).
If the resistance is incorrect, replace the faulty component.
Also measure the resistance of C340, C341, C342, C343, C372, C373, C374 (>100 kohms).
If the resistance is lower replace the faulty component.
Measure the VVCO-voltage on N301: 1 and 2, measure the voltage on R300, on the pin close
to C304.
If the voltage is incorrect, measure the resistance of R300 (10 ohms) and L302 (0.5 ohms).
If the resistance is incorrect, replace the faulty component.
Measure the VVCO-voltage on R331, measure on the pin close to C330.
If the voltage is incorrect, measure the resistance of R331 (10 ohms).
If the resistance is incorrect, replace R331.
If the fault remains, send the unit on according to the local company directives.
Connect a call at –68.5dBm input signal and power level 5.
If you are able to connect a call, go to section 2.5.
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