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

Flow Chart of Troubleshooting

10-2.RF

10-2-1. EGSM RX

NORMAL CONDITION catch the channel?

YES

②PAM100 CHECK pin12 ≥ -65dBm ?

YES

PAM100 CHECK

pin16 ≥ -65dBm ?

YES

F101 CHECK

pin3,4 ≥ -65dBm ?

YES

NO

NO

NO

NO

CHECK

ANT contact ?

PAM100,RFS100	③
resolder or change

PAM100

resolder or change

F101

resolder or change

CONTINUOUS RX ON

RF INPUT : 62CH

AMP : -50dBm

①

④U102 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	⑤
	resolder or change

NO

U107 pinA13, C172	⑥
change or resolder

NO

OSC100	⑦
change or resolder

U102

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

YES

U107 CHECK!!

NO

⑧

U102 resolder or change

10-16

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