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(1) Checking Regulator Circuit
TEST POINT
U503. 5
(OUT)
CIRCUIT
CLKON
Checking Flow
Regulator Circuit is OK
See next Page to check
U503
Figure 6
R522
0
R523
100K
Voltage at
NO
Pin5 of U503
Is 2.85V?
YES
VCTCXO
- 45 -
4. TROUBLE SHOOTING
VBAT
U503
MIC5255-2.85BM5
1
5
IN
OUT
2
GND
3
4
EN
BYP
C545
1u
Level at
NO
Pin3 of U503
Is high?
YES
Replace U503
U503. 3
(EN)
RF2V85
C546
C547
0.01u
4.7u
Change main board
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