Ericsson A2618s Troubleshooting Manual page 7

Trouble Shooting Guide, Standard
If you are not able to connect a call, open the unit and check for liquid damage.
No action is to be taken for a liquid damaged unit, send the unit on according to the local
company directives.
Make sure the antenna connector (W1) is not incorrectly soldered, mechanically damaged,
dirty or oxidised. Clean, re-solder or replace it if needed.
Check the soldering of N392, N391, and N390.
Try to connect a call again.
If you are able to connect a call, go to section 2.5.
If you still are not able to connect a call, send the unit on according to the local company
directives.
2.4 Read the RX-level while a call is connected
Make sure the output power is 31-35 dBm, and the RX-level value is 40 - 46 steps.
If that is correct there is probably nothing wrong with the unit.
Lower the input signal to –102 dBm, and make sure the RX-level value is 6-12 steps and the
RX-quality value is 0-2 steps.
If RX-level and RX-quality is correct, try running the unit through the test again.
If the unit passes the test but you are not able to connect a call towards the "real" net,
make sure the unit has not been locked out of the system due to theft.
If RX-level is correct and Rx-quality is high, send the unit on according to the local company
directives.
If the RX-level value is too high the unit needs to be calibrated.
If the RX-level value is less than 38 steps at an input signal of –68.5dBm
or less than 5 steps at an input signal of –102dBm then the fault is RX-related.
Open the unit and check for liquid damage.
No action is to be taken for a liquid damaged unit, send the unit on according to the local
company directives.
Make sure the antenna connector (W1) is not incorrectly soldered, mechanically damaged,
dirty or oxidised. Clean, re-solder or replace it if needed.
Check the soldering of N200, Z200, Z201 and N201.
Measure the resistance over L202 and L204 (0.15 Ohm).
Replace if incorrect.
Remove L203, L206 and L205, then measure the resistance from pin 2 of N200 to ground
(>100 kohms). The resistance usually becomes only a few ohms when N200 is faulty.
If the resistance is incorrect, replace N200 and mount L203, L206 and L205.
If the fault still remains, send the unit on according to the local company directives.
4/00021-2/FEA 209 544/25 A 7(24)