Ericsson GH 688 Trouble-Shooting Instruction page 11

GH688,GA628, Standard Electrical Repairs
Check soldering at G300 (fig. 2.5).
Measure the resistance of C853 (class B, >100 kohms, fig. 2.4).
Measure the resistance of R403 (class B, <1 ohms, fig. 2.6).
Measure the resistance of L300 (class A, <1 ohms, fig. 2.6).
If the problem isn't solved, send the phone to the next level.
2.3 Read the Rx-level and output power values
from the instrument while the call is still
connected.
• If the Rx-level value is at 40 - 46 steps, check that the output power is 31-
35dBm.
* If it is correct it means that the phone probably isn't faulty. Lower the signal
strength at the instrument to –102dBm and make sure that the Rx-level value
is 6-12 steps and that the Rx-quality value is 0-2 steps.
* Try running the phone through the test again.
* If the phone passes the test but doesn't manage to connect a call at
the "real" net, make sure that it isn't because it is stolen. If it isn't,
replace D600 (class B, fig. 2.1).
* If you get one of these error messages; "phase and frequency
error", "burst timing", "power level 5-19", "Rx-quality" or "Rx-
level" that differs slightly from the default values, try replacing the
4/00021-2/FEA 209 544/1.G
Fig. 2.6
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