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4. TROBULE SHOOTING
4.2.1 Checking Regulator Circuit
U402.3
Check Pin 5.
C436
10u
Check Pin 3.
RF 2.85V O.K?
No
Yes
Regulator Circuit is OK
See next Page to check
VCTCXO
VRF
MIC5255-2.85BM5 U402
5
OUT
C437
0.01u
4
BYP
VRF
U402.5
Figure 4-3
Pin3. High ?
Yes
Replace U402
VBAT
R418
1
IN
2
GND
R419
3
EN
C438
10u
Graph 4-1
- 38 -
No
Changing the Board
0
CLKON
RF_EN GPO_4
NA
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