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4.2.1 Checking Regulator Circuit
U402.3
Check Pin 5.
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
C436
BYP
10u
VRF
- 37 -
U402.3
Figure 4-3.
No
Pin3. High ?
Yes
Replace U402.
VBAT
1
R418
IN
2
GND
3
R419
EN
C438
10u
Graph 4-1
4. TROUBLE SHOOTING
Changing the Board
NA
CLKON
0
RF_EN
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