SH888, S868, Standare Electrical Repair
4/00021-2/FEA 209 544/3.D
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2 No serv or can’t place calls.
2.1 Find out if the fault is Rx- (receiver) or Tx-
related (transmitter).
Connect the phone (with signaling program) to a GSM test instrument and try to get
serv at -68.5dBm signal strength.
•
If the phone gets serv, proceed to section 2.2.
•
If the phone doesn’t get serv, the fault probably lies in the LO part or the losses
in the signal path are too great.
Open the phone and check for liquid damages.
Make sure the antenna connector (X101, class A, fig. 2.1) isn’t damaged, badly sol-
dered or dirty (glue, varnish, oxide...).
Fig. 2.1
Check for bad solderings at C318 (class A), N302 (class B) and N303 (class B, all in
fig. 2.1).