Gsm Transmitter - Samsung SGH-E600 Service Manual

4. GSM Transmitter

F1000 pin 15
about 2~3dBm?
YES
CN1000,
C1001,R1007
check & change
pin 4 : 3.7 V?
pin 2 : 1.2 V
U1000pin 6:
U1000 pin 7
change & resolder
U100 pin39,C112
change or
resolder
U901
NO
pin4,5,6,7
1.7V
U700
U1000
change
check & change
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SGH-E600/E608 Flow Chart of Troubleshooting and Circuit Diagrams
NO
F1000
pin 13 : 2.8V
YES
U1001 pin11
pin 3~4dBm?
NO
YES
F1000
check & change
NO
U1000
BATTERY, U100
check & change
YES
NO
U1000
YES
NO
U1000
U700
pin3:3V check & change
YES
NO
1.2 V?
YES
NO
: -5dBm?
YES
U1000
U901
NO
pin9,32
2.8V?
YES
U901
NO
pin 8 13MHz
Vp-p :950mV
YES
YES
U901change or resolder
NO
U700,U701
check & change
NO
pin 3 :13MHz?
Vp-p : 950mV
2-13
CONTINUS TX ON
CONDITION
MS TX level 19
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
OSC800
OSC800
NO
change or
resolder
YES
U100 pin39,c112
NO
OSC800
change or
pin 4 : 3V ?
resolder
YES
U901
change or
resolder