4. TROUBLE SHOOTING
- 57 -
(1) Checking Regulator Circuit
U503. 5
(OUT)
U503. 3
(EN)
U503
RF LDO
RF2V85
0
R517
VBAT
100K
R518
C545
0.01u
C544
1u
4.7u
C546
U503
MIC5255-2.85BM5
BYP
4
3
EN
2
GND
IN
1
OUT
5
CLKON
Regulator Circuit is OK
See next Page to check
VCTCXO
Voltage at
Pin5 of U503
Is 2.85V?
Level at
Pin3 of U503
Is high?
YES
NO
Replace U503
YES
NO
Change main board
Test Points
CIRCUIT
Checking Flow
Figure 4-8
Summary of Contents for S5000
Page 1: ...Date November 2005 Issue 1 0 Service Manual S5000 Service Manual Model S5000 ...
Page 3: ... 4 ...
Page 82: ...4 TROUBLE SHOOTING 83 4 12 KEY backlight Trouble Test Points Figure 4 21 ...
Page 101: ...5 DOWNLOAD AND CALIBRATION 102 9 Phone test Finish is shown in below screen ...
Page 103: ... 104 ...
Page 111: ... 112 8 PCB LAYOUT ...
Page 112: ... 113 8 PCB LAYOUT ...
Page 113: ... 114 ...
Page 121: ...10 STAND ALONE TEST 122 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 125: ... 126 ...
Page 126: ... 127 ...
Page 128: ... 129 12 EXPLODED VIEW REPLACEMENT PART LIST ...
Page 129: ... 130 ...