Pcs Receiver - Samsung SGH-i700 Service Manual

14. PCS Receiver

CONTINUOUS RX ON
RF INPUT : 660CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
F1001 CHECK
pin15 ≥ -65dBm ?
F1001 CHECK
pin6 ≥ -65dBm ?
F1002 CHECK
pin 3,4 ≥ -65dBm ?
U1002 CHECK
pin17,18 ≥ -65dBm ?
NO
U1002
pin 12,13≥
-20dBm ?
YES
U1002 CHECK
pin 14,23,26,32:
clean 2.8V?
YES
U1002 pin3,4
Vp-p : 240mV?
YES
U1002 pin1, 2 Vp-p
: 250mV ?
YES
U1001pin 2,3,4,5
Vp-p : 100mV ?
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO
YES
U1003 CHECK
pin5,25,28 : 3V ?
YES
U1003 CHECK
pin 7 : 13MHz ?
Vp-p : 860mV?
YES
U604 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
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SGH-I700 Flow Chart of Troubleshooting
Check soldered status of
L1006, L1002
CN703
resolder or change
F1001
resolder or change
F1002
resolder or change
C1021 ,C1022 ,L1005
resolder or change
NO
U701 pin33 , C724
check or resolder
NO
OSC901 CHECK
pin 3 : 13MHz ?
Vp-p : 950mV?
YES
C921 , R907
change or resolder
U1001 CHECK
pin6, 20 : 2.8V ?
YES
U1001
resolder or change
2-19
NO
OSC901
NO
CHECK
pin 4 : clean
3V ?
YES
OSC901 change or
resolder
NO
U701 pin33, C724
check or resolder