Gsm900 Transmitter - Samsung GT-E1172 Service Manual

8-3-12. GSM900 Transmitter

TX ON (5Level)
Yes
PAM100 Pin15 ≥
30dBm
(TP:L111 using
spectrum analyzer)
No
PAM100 pin4 ≥ -4
dBm
(TP:C111 using
spectrum analyzer)
No
PAM100 pin2
≥ -4dBm
(TP:C112 using
spectrum analyzer
No
Check & Resolder
C200, C201, C203, C204, L200,
And PMU Part and UCP200
Yes
END
yes
Resolder L110, L111, C118
Yes
Yes
Yes
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Check PAM100
pin 8(H=2.4V)
Pin10(H=2.4V)
Check PAM100
VBATT(pin11=3.7V)
(TP:C108) OK?
No
Resolder or Change
L105, C110, C111
8-32
Level 3 Repair
No
Check ANT Switch
control circuit
Yes
Change or Resolder
PAM100
Yes
Change the UCP200
if a damaged chip.
Check VBAT
using the osciliscope
(TP:C108)
or PAM control signal