Dcs Receiver - Samsung SGH-i700 Service Manual

Samsung mobile phone service manual
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SGH-I700 Flow Chart of Troubleshooting

13. DCS Receiver

NORMAL CONDITION
catch the channel?
F1001 CHECK
pin15 ≥ -65dBm ?
F1001 CHECK
pin3,4 ≥ -65dBm ?
U1002 CHECK
pin19,20 ≥ -65dBm ?
U1002
pin 12,13≥
-20dBm ?
YES
U1002 CHECK
pin 14,23,26,32:
clean 2.8V?
YES
U1003 pin3,4
Vp-p : 240mV?
YES
U1002 pin1, 2
Vp-p : 250mV ?
YES
U1001 pin 2,3,4,5
YES
Vp-p : 100mV ?
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
U1003 CHECK
pin5,25,28 : 3V ?
YES
U1003 CHECK
pin 7 : 13MHz ?
Vp-p : 860mV?
YES
U1003 change or
resolder
NO
U701 pin39, C725
check or resolder
NO
NO
U1002
resolder or change
NO
CHECK
U901
SAM SU N G Pr opr i et ar y- C ont ent s m ay change w i t hout not i ce
This Document can not be used without Samsung's authorization
Check soldered status of
L1006, L1002
CN703
resolder or change
F1001
resolder or change
C1018 .C1020 ,L1004
resolder or change
NO
U701 pin33 , C724
check or resolder
NO
OSC901 CHECK
pin 3 : 13MHz ?
Vp-p : 950mV?
YES
C921 , R907
resolder
U1001 CHECK
pin6, 20 : 2.8V ?
YES
U1001
resolder or change
2-18
CONTINUOUS RX ON
RF INPUT : 698CH
AMP : -50dBm
NO
NO
OSC901 CHECK
pin 4 : clean
3V ?
YES
OSC901 change or
resolder
NO
U701 pin33, C724
check or resolder

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