2.rf, 2-1. egsm rx – Sharp SGH-C130 User Manual
Page 50
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Flow Chart of Troubleshooting
10-16
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PAM100
CHECK
pin12 ≥ -65dBm ?
10-2.RF
10-2-1. EGSM RX
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
NORMAL CONDITION
catch the channel?
CHECK
ANT
contact ?
U102
pin 12,13,25,26,27:
2.8V ?
PAM100 CHECK
pin16 ≥ -65dBm ?
U102
CHECK
pin21,22 ≥ -65dBm ?
PAM100,RFS100
resolder or change
PAM100
resolder or change
C105,C109,L104
resolder or change
U107 pinA13, C172
change or resolder
U102 CHECK
pin 30,31 :
26MHz ?
Vp-p : 950mV?
OSC100
change or resolder
U102
resolder or change
U107
CHECK!!
U102
pin 4,5,6,7 Vp-p
: 120mV ?
NO
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
YES
YES
YES
①
③
②
④
⑤
⑥
⑦
⑧
F101 CHECK
pin3,4 ≥ -65dBm ?
F101
resolder or change
YES
NO