Ericsson T28S Troubleshooting Manual page 7

Trouble Shooting Guide, Standard
2.2.1 Check the feed voltages
The VRAD voltage for N234:
Measure the voltage at pin 5 of N234 (3.80 V).
If the voltage is incorrect, measure the resistance of L211 (0 ohm).
If the resistance is incorrect, replace L211.
Measure the voltage at pin 47 of N234 (3.80 V).
If the voltage is incorrect, measure the resistance of R345 (18 ohms).
If the resistance is incorrect, replace R345.
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.
The VVCO voltage for D300:
Measure the voltage on R303, at the pin close to R346 (3.80 V).
If the voltage is incorrect, measure the resistance of R303 (18 ohms).
If the resistance is incorrect, replace R303.
Measure the voltage on R334, at the pin close to C333 (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.
4/00021-2/FEA 209 544/19 E 7(29)