Flow Chart of Troubleshooting

10-2.RF

10-2-1. EGSM RX

NORMAL CONDITION catch the channel?

YES

PAM100 CHECK pin12 -65dBm ?

YES

PAM100 CHECK

pin16 -65dBm ?

YES

F101 CHECK

pin3,4 -65dBm ?

YES

NO

NO

NO

NO

CHECK

ANT contact ?

PAM100,RFS100

resolder or change

PAM100

resolder or change

F101

resolder or change

CONTINUOUS RX ON

RF INPUT : 62CH

AMP : -50dBm

U102 CHECK

pin21,22 -65dBm ?

YES

U102

pin 12,13,25,26,27:

2.8V ?

YES

U102 CHECK

pin 30,31 :

26MHz ?

Vp-p : 950mV?

YES

NO

 

 

C105,C109,L104

 

 

 

 

resolder or change

 

 

 

 

NO

U107 pinA13, C172

change or resolder

 

NO

OSC100

change or resolder

U102

pin 4,5,6,7 Vp-p : 120mV ?

YES

U107 CHECK!!

NO

U102 resolder or change

10-16

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Sharp SGH-C130 manual 10-2.RF, Egsm RX