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Checking LDO Circuit
U605
PIN6
PIN3
(RF2.85V)
(RF_EN)
RF2.85V
U605
MIC5255-2.85BM5
5
1
OUT
IN
2
GNO
4
3
BYP
EN
C655
C658
0.01u
1u
(1608)
PIN1
(VBAT)
VBAT
RFEN
C559
C660
1u
1000p
(1608)
- 79 -
4. TROUBLE SHOOTING
Check Pin 1
No
3.4 ~ 4.2V?
Yes
No
Pin 3 High?
Yes
No
Pin 5
2.85V?
Yes
Regulator Circuit is OK.
See next page to check
VCTCXO Circuit.
Paging Period 5
Paging Period 5
Check Battery
Check DBB[U102]
Replace Regulator
[U605]
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