Samsung SGH-M300 Service Manual page 31
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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3-2-2. DCS RX
SAMSUNG Proprietary-Contents may change without notice
NORMAL CONDITION
catch the channel?
YES
U100
CHECK
pin12 ≥ -65dBm ?
YES
U100 CHECK
pin18 ≥ -65dBm ?
YES
F101 CHECK
pin3,4 ≥ -65dBm ?
YES
U101
CHECK
pin19,20 ≥ -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!!
This Document can not be used without Samsung's authorization
NO
CHECK
ANT
contact ?
NO
U100,RFS101
resolder or change
NO
U100
resolder or change
NO
F101
resolder or change
NO
C13,C116,L108
resolder or change
NO
UCP301 pinA13, C312
change or resolder
OSC101
change or resolder
NO
U101
resolder or change
3-16
Flow Chart of Troubleshooting
CONTINUOUS RX ON
RF INPUT : 698CH
AMP : -50dBm
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