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4. TROUBLE SHOOTING
(1) Checking Regulator Circuit
TEST POINT
U504. 5 (OUT)
CIRCUIT
CHECKING FLOW
YES
Regulator Circuit is OK
See next Page to check
VBAT
CLKON
C545
C546
27p
1uF
Voltage at
NO
Pin5 of U502
Is 2.85V?
VCTCXO
U504
Figure 4-3.
2V85_RF
U504
MIC5255-2.85BM5
1
5
IN
OUT
2
GND
3
4
EN
BYP
C543
C547
4.7u
0.01u
Figure 4-4.
Level at
NO
Pin3 of U502
Is high?
YES
Replace U502
Figure 4-5.
- 78 -
U504. 3(EN)
C544
27p
Change main board
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