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4 . TROUBLE SHOOTING
(1) Checking Regulator Circuit
TEST POINT
CIRCUIT
Checking Flow
Voltage at
Pin5 of U702
Is 2.8V?
Regulator Circuit is OK
See next Page to check
VCTCXO
VBAT
CLKON
C533
10u
NO
Figure 4-2
U702 MIC5255-85BM5
1
5
IN
OUT
2
GNO
3
4
EN
BYP
C734
0.01u
Level at
NO
Pin3 of U702
Is high?
YES
Replace U702
- 48 -
RF2V85
C534
10u
(1608)
Change main board
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