4. TROUBLE SHOOTING
- 51 -
(1) Checking Regulator Circuit
Test Points
Circuit Diagram
Checking Flow
U303. 3
U303. 5
Pin 3. High ?
Yes
Changing the Board
RF 2.85V O.K?
Yes
No
Replace U303
Regulator Circuit is OK
See next Page to check
VCTCXO
No
Check Pin 5.
VRF
VBAT
4
BYP
EN
3
GND
2
1
IN
5
OUT
U303
MIC5255-2.85BM5
4.7u
C345
C344
10u
0.01u
C343
CLKON
Figure 4-2
Summary of Contents for C1150
Page 1: ...Service Manual Model C1150 Service Manual C1150 Date October 2005 Issue 1 0 ...
Page 3: ......
Page 99: ...Note 100 ...
Page 104: ... 105 8 PCB LAYOUT 8 PCB LAYOUT ...
Page 105: ... 106 8 PCB LAYOUT ...
Page 113: ...10 STAND ALONE TEST 114 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 117: ...Note 118 ...
Page 119: ... 120 Note ...
Page 135: ...Note 136 ...