Ericsson T18s Trouble-Shooting Instruction page 7

Try again to get SERV at –102dBm.
• If the phone gets SERV at –102dBm there's probably nothing wrong with the
phone. Run the phone through the final test (Go/No go-test).
Open the phone.
Give the board power and start it up by pressing the On/Off key.
Measure the VVCO voltage at pin 5 of N470 (fig. 2.3, ~3.8V).
• If the voltage is too low, replace N470 and C472 (both of class A and in fig. 2.3).
* If the voltage still is too low, send the phone to Advanced electrical
repairs.
Measure the resistances of C541-C546 (>200 kohms, fig. 2.3).
• If the resistance of any of the capacitors is too low, replace the corresponding
capacitor.
Check the solderings of Z530, C531 and L530 (fig. 2.3).
If the fault remains, send the phone to advanced electrical repairs.
4/00021-2/FEA 209 544/12.B
T18s, T18sc Standard Electrical Repairs
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