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Level 3 Repair
8-3-2-2. GSM850 Transmitter
TX ON(Call Connected)
TCH Channel : 190 Ch
TCH Pwr = 5Level(33dBm)
BCH Pwr = -50dBm
RFS101 Pin2
>= 20dBm
No
RFS101 pin11
>= 20 dBm
No
PAM100 pin 10
>= 20 dBm
No
1.5dBm >=
PAM100 pin7
> = 4dBm
No
U100 pin 55
>= 0dBm
No
Check U100 & UCP300
(crack,open,etc)
END
Yes
Resolder RFS100,L103,C100,L149
Yes
Yes
Resolder L153,C154,C162
Yes
Yes
Resolder C139,R121,101,122
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Check RFS100
pin3 = H, pin4 = L ,
,pin5 = L, pin6 = L ,
pin7 =2.7V
(C105,107)
Yes
Yes
Check PAM100
and VBAT(pin4) OK?
(C103)
No
8-30
No
Check
R107,109,110,111
and UCP300, U401
(crack,open,etc)
Change or Resolder
RFS100
Resolder or Change PAM100
Check VBAT or PAM
control signal(Pin5,6)
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