Ericsson R320s Working Instruction page 24

Trouble Shooting Guide, Standard
If the Rx-level value is too high the phone needs to be calibrated, send the unit on according
to the local company directives.
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 phone and check for liquid damage.
Make sure that the antenna connector (W100, fig. 2.1) is not incorrectly soldered,
mechanically damaged, dirty or oxidised. Clean, resolder or replace if needed.
Check the soldering of N200, Z200 and Z201.
Remove L204 and measure the resistance from pin 2 of Z200 to ground (>100 kohms). The
resistance usually becomes only a few ohms when Z200 is faulty.
If the resistance is incorrect, replace Z200 and mount L204.
If the fault remains the unit may have to be calibrated, send the unit on according to the local
company directives.
4/00021-2/FEA 209 544/21 B 8(26)