Flow Chart of Troubleshooting

10-2-3. EGSM TX

PAM100 pin12

NO

PAM100

NO

: about 2~3

 

 

 

pin6 : 2.8 V?

 

 

dBm?

 

 

 

YES

YES

check&changeC199,RFS100

U107

check & change

CONTINOUS TX ON CONDITION

TX POWER DAC: 600 CODE APPLIED

CH : 62

RBW : 100KHz

VBW : 100KHz

SPAN : 10MHz

REF LEV. : 10dBm

ATT. : 20dB

PAM100

 

NO

BATTERY

pin7 : 3.7

V?

 

 

check & change

 

 

 

 

 

 

YES

 

 

 

 

PAM100

NO

R118

 

 

 

 

 

pin 8 : 1.6V ?

 

Check

 

 

YES

 

 

 

NO

PAM100 pin11

 

 

 

 

about : -5dBm

 

 

 

 

?

 

 

 

 

YES

 

 

 

 

PAM100

NO

 

 

 

pin 4 : 2.9V?

 

 

 

 

YES

 

 

 

 

PAM100

U107

 

 

 

change or resolder

check

 

 

 

NO

U102

 

 

 

pin12,13,25,26,

 

 

28 : 2.8V ?

 

 

 

 

 

YES

 

 

 

 

 

U102

NO

 

U107

pin30,31 :

 

pinA13,C172

26MHz ?

change or resolder

Vp-p : 950mV?

 

 

 

 

 

YES

 

 

 

NO

U102

 

 

 

 

pin4,5,6,7:100m

 

 

 

 

V?

 

 

 

 

 

YES

 

 

 

 

 

 

 

 

 

 

 

U107

 

 

 

 

change or resolder

 

U102

 

 

change or resolder

 

 

 

OSC100 change or resolder

10-20

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Image 54
Sharp SGH-C130 manual Egsm TX, U107