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4.3.1 Checking Regulator Circuit
U402.3
Check Pin 5.
RF 2.85V O.K?
Regulator Circuit is OK
See next Page to check
VCTCXO
VRF
MIC5255-2.85BM5 U402
C437
0.01u
C436
10u
VRF
Check Pin 3.
Pin3. High ?
No
Yes
Replace U402
VBAT
5
1
OUT
IN
2
GND
4
3
BYP
EN
Graph 4-7
- 45 -
U402.5
Figure 4-10
No
Changing the Board
Yes
R418
0
CLKON
R419
NA
RF_EN GPO_4
C438
10u
4. TROUBLE SHOOTING
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