Yes No
Yes
No
No No
No
No
No
Yes
Yes
Yes
Yes
Yes
Is supply to
U1111 pin 12
near 3.3 V?
Is logic correct?
Is the pin
shorted?
Is the pin
shorted?
3
Is resistance
less than 10
Ohms?
Is resistance
less than 10
Ohms?
4
Were any pins
shorted?
Lift shield SH11 and
check switch U1111
for functionality.
In RX mode, and main antenna
mode measure resistance from
pin 28 to pin 1 of U1111. Then in
RX mode and auxiliary antenna
mode measure resistance from
pin 24 to 28.
Repeat resistance
measurement from center
pin of J101 and J102 to
pin 28 of U1111 for main
and auxiliary antenna
modes respectively.
Replace defective
antenna connector
J101 or J102.
Check pin 12 for
solder shorts.
Verify voltage divider
at R1183 and R1184
under sheild SH13.
Check pin 13 for
solder shorts.
Verify voltage at pin
22 of U703 under
sheild SH1. See
FGU trouble
shooting charts for
further information.
Clear short, or
replace U1111.
Clear short, or
replace U1111.
Verify logic to pin 13 of U1111.
Pin 13 should be near 2.775 V
for the main antenna and near 0
V for the auxiliary antenna port.
Check for solder
shorts on the RF pins
1,2,23,24, and 28.
Clear short, or
replace U1111.
If all else is OK, and
resistance is still high,
then replace U1111
and re-measure
power.
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