Egsm Receiver - Samsung SGH-X430 Service Manual
Gsm telephone
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Also See for SGH-X430:
- Quick manual (83 pages) ,
- Quick reference card (2 pages) ,
- Service manual (37 pages)
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7. SGH-X430 Flow Chart of Troubleshooting
8. EGSM Receiver
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
YES
U1005 CHECK
pin15 ≥ -65dBm ?
YES
U1005 CHECK
pin1, 2 ≥ -65dBm ?
YES
U900 CHECK
pin20,21 ≥ -65dBm ?
YES
U900 CHECK
pin 8 : 13MHz ?
Vp-p : 860mV?
YES
U900 CHECK
pin 9: clean 3V?
YES
U900 pin1,2,3,28
Vp-p : 100mV?
YES
CHECK
U700
This Document can not be used without Samsung's authorization
NO
Check soldered status of
C1001,C1000
NO
CON1
resolder or change
NO
U1005
resolder or change
NO
C1003,C1004,L1001
resolder or change
NO
OSC901 CHECK
pin 3 : 13MHz ?
Vp-p : 950mV?
YES
C912,R903,C902
resolder
NO
U100 pin46, C114
check or resolder
NO
U900
resolder or change
SAMSUNG Proprietary-Contents may change without notice
NO
OSC901 CHECK
pin 4 : clean 3V
?
YES
OSC901 change or
resolder
7-9
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