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10-2-2. EGSM Transmitter
F901 pin10
about 2-3dBm?
Yes
RFS901,C933,L901
check or change
F901,PAM901
U903
pin1,8,31,36,41=
2.8V?
Yes
U903
pin25,26,27,28=
1.7V?
Yes
PAM901
change
or resolder
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F901
No
pin11=2.8V?
Yes
Between
No
F901,C923
≒ 4~5dBm?
No
Battery,UCD701
TA902:3.7V
check or change
Yes
Between
No
1.2V?
UCD701
No
pinA13,C735
cgange or resolder
No
No
UCD701
U903 change
change
or resolder
Flow Chart of Troubleshooting and Circuit Diagrams
No
UCD701 check
or change
Yes
F901 check
or change
No
F901 check
or change
Yes
U903 pin
No
35:26MHz?
Vp-p:860mV
Yes
U903 pin
32,33
=3V?
Yes
UCD701 pin
A13,C735
change or
or resolder
resolder
10-24
Continuous TX on
CONDITION TX POWER
DAC500 CODE APPLIED
CH62
RBW : 100KHz
VBW : 100KHz
SPAN : 10MHz REF
LEV : 10dBm ATT :
20dB
UCD701
check or
change
TCX901 check
or resolder
No
TCX901
pin3 : 26MHz?
Vp-p:1V
Yes
No
TCX901
Pin4:3V?
Yes
U903 change
or resolder
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