Flow Chart of Troubleshooting

10-2-2. DCS RX

NORMAL CONDITION catch the channel?

YES

PAM100 CHECK pin12 -65dBm ?

YES

PAM100 CHECK

pin20 -65dBm ?

YES

F102 CHECK

pin3,4 -65dBm ?

YES

NO

NO

NO

NO

CONTINUOUS RX ON

RF INPUT : 698CH

AMP : -50dBm

CHECK

ANT contact ?

 

 

 

PAM100,RFS100

resolder or change

PAM100

resolder or change

F101

resolder or change

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

 

 

C117,C118,L105

 

 

 

 

resolder or change

 

 

 

 

NO

U107 pinA13, C172

change or resolder

 

OSC100

change or resolder

U102

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

YES

U107 CHECK!!

NO

U102 resolder or change

10-18

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Image 52
Sharp SGH-C130 manual Dcs Rx