4. TROUBLE SHOOTING
- 85 -
4.6.1 Checking VCO Block
TP4
TP5
TP6
TP1
TP2
TP3
Test Point (TXVCO Level)
(2012)
(PPS)
0.1u
C150
24
R109
R121
51
220
R118
0.01u
C145
22n
C128
R112
100
C133
82p
51
R116
100
R113
FB100
1
OUT_GSM
9
SW1
11
SW2
3
VB
VC
10
MQW5V0C869M
GND1
2
GND2
4
GND3
6
7
GND4
GND5
8
GND6
12
13
GND7
GND8
14
5
OUT_DCSPCS
U103
C151
100p
L121
10nH
15
R111
C127
1000p
270
R120
150
R117
VDD_M
15p
C139
VDDA11
39
41
VDDA12
SBCK
TX_MOD_CP
40
42
TX_VCO_FB
C147
10u
0.1u
C137
R106
82
10u
L120
9.1nH
C135
200
R119
R110
47
0.1u
C144
C136
33p
1000p
C125
15p
C138
C126
120p
VREG_RFTX_2.85V
VREG_MSMP_2.7V
GSM_TX_VCO_0_EN_N
GSM_TX_VCO_1_EN_N
VREG_RFTX_2.85V
RF_ON_TX_ON
Schematic of RF TXVCO
TP5
TP6
TP1
TP4
TP2
TP3
Summary of Contents for U890
Page 1: ...Date April 2006 Issue 1 0 Service Manual Model U890 U890c Service Manual U890 U890c ...
Page 3: ... 4 ...
Page 20: ...3 TECHNICAL BRIEF 21 ...
Page 46: ...3 TECHNICAL BRIEF 47 Figure PM6650 2 Functional Block Diagram ...
Page 70: ...4 TROUBLE SHOOTING 71 4 2 SIGNAL PATH ...
Page 109: ...4 TROUBLE SHOOTING 110 CN600 50pin LCD connector CN901 C907 C911 FB901 FB902 ...
Page 115: ...4 TROUBLE SHOOTING 116 C226 C227 for MIC serial capacitor ...
Page 118: ...4 TROUBLE SHOOTING 119 Q400 Q401 Q402 VBATT GND ...
Page 139: ...Table 2 1 1 RF Block Component 6 BLOCK DIAGRAM 140 ...
Page 140: ...6 BLOCK DIAGRAM 141 6 2 Interface Diagram U890 Interface Diagram ...
Page 142: ...6 BLOCK DIAGRAM 143 Top Side ...
Page 143: ...6 BLOCK DIAGRAM 144 Bottom Side ...
Page 152: ... 153 8 pcb layout ...
Page 153: ... 154 8 pcb layout ...
Page 154: ... 155 8 pcb layout ...
Page 155: ... 156 8 pcb layout ...
Page 156: ... 157 8 pcb layout ...
Page 157: ... 158 8 pcb layout ...
Page 163: ...9 CALIBRATION 164 9 3 HOT KIMCHI Example Choose_U890 ...
Page 164: ...9 CALIBRATION 165 Click APPLY button Click START button ...
Page 165: ...9 CALIBRATION 166 Click Run button to lunch RF AUTOTEST ...
Page 167: ... 168 ...
Page 191: ...Note ...
Page 192: ...Note ...