Sharp 902SH Service Manual page 45

In the overseas mode (GSM), "out-of-range" appears, and no transmission/reception is available.
Is the system setting set to "Auto" or "GSM"?
YES
Is the USIM inserted?
YES
[Reception system]
Are 4 reception bars displayed?
* Set the BCCH/TCH level of a simulator to -80
dBm in EGSM band.
NO
Is the voltage approx. 2.75 V applied to VCCA/
VCCB line?
YES
Is the EGSM band received signal sent to
IC100 pins 4 and 5?
NO
Is the EGSM band received signal sent from
FL001 pin 1?
NO
s the EGSM band received signal sent to
FL001 pin 7?
NO
Is the EGSM band received signal sent to
FL003 pin 3?
NO
CN1300 is defective.
D
[Transmission system]
Does IC100 oscillate at the frequency of the
EGSM band transmitted signal?
YES
Is the IQ signal sent to IC100 pins 49, 50, 51,
and 52?
YES
Is the EGSM band transmitted signal sent to
IC300 pin 5?
YES
Is the EGSM band transmitted signal sent to
FL001 pin 13?
YES
Is the EGSM band transmitted signal sent to
FL003 pin 1?
YES
Is the EGSM band transmitted signal sent to
FL003 pin 3?
YES
CN1300 is defective.
CONFIDENTIAL
Change the setting in the network settings to
NO
"Auto" or "GSM".
NO
Insert the USIM.
YES
D
IC1000, IC1200 and Main PWB-A are defec-
NO
tive.
IC100, IC101 and IC1000 are defective.
YES
FL110 is defective.
YES
FL001 is defective.
YES
FL003 is defective.
YES
IC100, IC400, X770 and IC1000 are defective.
NO
IC100 and Main PWB-A are defective.
NO
IC100 and FL330 are defective.
NO
IC300 and IC1200 are defective.
NO
FL001 is defective.
NO
FL003 is defective.
NO
2 – 37
902SH