Samsung SGH-M300 Service Manual page 33
Gsm telephone
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Also See for SGH-M300:
- User manual (2 pages) ,
- Quick start manual (7 pages) ,
- Service manual (62 pages)
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3-2-3. EGSM TX
U100
pin
:
12
about 2~3 dBm?
YES
C111,RFS101
check&change
U100
pin7 : 3.7 V?
YES
U100
pin 8 : 1.6V ?
YES
NO
U100 pin11
about : -5dBm ?
YES
U100
pin 4 : 2.9V?
YES
U100
change or resolder
NO
UCP301pinA13,C312
change or resolder
SAMSUNG Proprietary-Contents may change without notice
NO
NO
U100
pin6 : 2.8 V?
YES
NO
BATTERY
check & change
NO
R106
Check
NO
UCP301
check
U101
pin13 : 2.9V ?
YES
U101
pin30,31 : 26MHz
?
Vp-p : 380mV?
YES
NO
U101
pin4,5,6,7 :
100mV?
YES
UCP301
change or resolder
U101
change or resolder
This Document can not be used without Samsung's authorization
UCP301
check & change
NO
OSC101
change or resolder
3-18
Flow Chart of Troubleshooting
CONTINOUS TX ON CONDITION
TX POWER DAC: 600 CODE APPLIED
CH : 62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz
REF LEV. : 10dBm
ATT. : 20dB
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