Samsung SGH-M300 Service Manual page 29
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.RF
3-2-1. EGSM RX
NORMAL CONDITION
catch the channel?
YES
U100
CHECK
pin12 ≥ -65dBm ?
YES
U100 CHECK
pin16 ≥ -65dBm ?
YES
F100 CHECK
pin3,4 ≥ -65dBm ?
YES
CHECK
U101
pin21,22 ≥ -65dBm ?
YES
U101
pin 13 : 2.9V ?
YES
U101 CHECK
pin 30,31
freq :26MHz ?
Vp-p : 380mV?
YES
U101
pin 4,5,6,7 Vp-p
: 120mV ?
YES
UCP301
CHECK!!
SAMSUNG Proprietary-Contents may change without notice
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NO
CHECK
ANT
contact ?
NO
U100,RFS101
resolder or change
NO
U100
resolder or change
NO
F100
resolder or change
NO
C101,C106,L102
resolder or change
NO
UCP301 pinA13, C312
change or resolder
NO
OSC101
change or resolder
NO
U101
resolder or change
3-14
Flow Chart of Troubleshooting
CONTINUOUS RX ON
RF INPUT : 62CH
AMP : -50dBm
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