Trouble Shooting Guide, Standard
4/00021-2/FEA 209 544/21 B 7(26)
Measure the voltage at pin 62 of N234 (3.80 V).
If the voltage is incorrect, measure the resistance of L370 (0 ohm).
If the resistance is incorrect, replace L370.
If the resistance is correct, measure the resistance from one of the sides of L370 to ground (>1
Mohm).
If the resistance from L370 to ground is incorrect, replace C373 and R362.
The VVCO voltage for D300:
Measure the voltage at R303 (3.80 V), at the side close to R346.
If the voltage is incorrect, measure the resistance of R303 (18 ohms).
If the resistance is incorrect, replace R303.
If the resistance is correct, measure the resistance at R303, (at the side close to R346), to
ground (130 kohms).
If the resistance at R303 is incorrect, replace C303.
Measure the voltage at the marked side of R334 (3.80 V).
If the voltage is incorrect, measure the resistance of R334 (10 ohms).
If the resistance is incorrect, replace R334.
If the fault remains, send the unit on according to the local company directives.
2.3 Connect a call at –68.5dBm input signal and
powerlevel 5
If you are able to connect a call, continue at 2.4.
If you are not able to connect a call, 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 N351, R400 and R422.
Try to connect a call again.
If you were able to connect a call, go to section 2.4.
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 call is connected
Make sure that the output power is 31-35 dBm and the Rx-level value is 43±3 steps.
If that is correct there is probably nothing wrong with the phone.
Decrease the input signal to –102 dBm and make sure that the Rx-level value is 6-12 steps
and the Rx-quality value is 0-2 steps.
Try running the phone through the test again.
If the phone passes the test but you are not able to connect a call towards the “real” net, make
sure that the phone has not been locked out of the system due to theft.
To Next Page
Loading...
