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(1) Checking Regulator Circuit
TEST POINT
CIRCUIT
Checking Flow
Voltage at
Pin5 of U503
Is 2.85V?
YES
Regulator Circuit is OK
See next Page to check
VCTCXO
U503. 5
(OUT)
U503
R522
CLKON
0
R523
100K
NO
Replace U503
- 37 -
4. TROUBLE SHOOTING
VBAT
RF2V85
U503
1
5
IN
OUT
2
GND
3
4
EN
BYP
MIC5255-2.85BM5
C545
C546
1u
0.01u
Level at
NO
Pin3 of U503
Is high?
YES
U503. 3
(EN)
C547
4.7u
Change main board
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